Patterson-UTI Energy
PTEN
#3467
Rank
S$5.44 B
Marketcap
S$14.34
Share price
-0.80%
Change (1 day)
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UNITED STATES SECURITIES AND EXCHANGE COMMISSION
WASHINGTON, D.C. 20549

---------------------

FORM 10-K
---------------------

(MARK ONE)
[X]ANNUAL REPORT UNDER SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE
ACT OF 1934 FOR THE FISCAL YEAR ENDED DECEMBER 31, 1999

OR

[ ]
TRANSITION REPORT UNDER SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE
ACT OF 1934 FOR THE TRANSITION PERIOD FROM TO

COMMISSION FILE NUMBER 0-22664

---------------------

PATTERSON ENERGY, INC.
(Exact name of registrant as specified in its charter)

<TABLE>
<S> <C>
DELAWARE 75-2504748
(State or other jurisdiction of (I.R.S. Employer Identification No.)
incorporation or organization)
</TABLE>

P.O. BOX 1416, 4510 LAMESA HIGHWAY,
SNYDER, TEXAS
79550
(Zip Code)
(Address of principal executive offices)
---------------------

Registrant's Telephone Number, Including Area Code: (915) 573-1104
---------------------

Securities Registered Pursuant to 12(b) of the Act: None
Securities Registered Pursuant to 12(g) of the Act:

(TITLE OF CLASS)
Common Stock, $.01 Par Value

Indicate by check mark whether the registrant (1) has filed all reports
required to be filed by Section 13 or 15 (d) of the Securities Exchange Act of
1934 during the preceding 12 months (or for such shorter period that the
registrant was required to file such reports), and (2) has been subject to such
filing requirements for the past 90 days. Yes [X] No [ ]

Indicate by check mark if disclosure of delinquent filers pursuant to Item
405 of the Regulation S-K is not contained herein, and will not be contained, to
the best of the registrant's knowledge, in definitive proxy or information
statements incorporated by reference in Part III of this Form 10-K or any
amendment to this Form 10-K. [X]

The aggregate market value of the voting and non-voting common equity held
by non-affiliates of the registrant as of March 24, 2000 was $934,494,274, based
upon the average bid and asked prices of $28.50 and $30.50, respectively, on the
Nasdaq National Market.

As of March 24, 2000, the registrant had outstanding 32,694,940 shares of
common stock, $.01 par Value, its only class of voting stock.

DOCUMENT INCORPORATED BY REFERENCE

Parts of the following document are incorporated by reference into Part III
of this Annual Report on Form 10-K: Definitive Proxy Statement for the
registrant's 2000 Annual Meeting of Stockholders.
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2

PART I

The "Company" or "Patterson" is used in this report to refer to Patterson
Energy, Inc. and its consolidated subsidiaries. The Company may from time to
time make written or oral forward-looking statements, including statements
contained in the Company's filings with the Securities and Exchange Commission
and its reports to stockholders. Items 1 and 2 contain forward-looking
statements and are made pursuant to the "safe harbor" provisions of the Private
Securities Litigation Reform Act of 1995. These statements include, without
limitation, statements relating to the drilling and completion of wells, well
operations, utilization rates of drilling rigs, reserve estimates (including
estimates for future net revenues associated with such reserves and the present
value of such future net reserves), business strategies and other plans and
objectives of the Company's management for future operations and activities and
other such matters. The words "believes," "budgeted," "plans," "intends,"
"strategy," or "anticipates" and similar expressions identify forward-looking
statements. The Company does not undertake to update, revise or correct any of
the forward-looking information. Readers are cautioned that such forward-looking
statements should be read in conjunction with the Company's disclosures under
the heading: "Cautionary Statement for Purposes of the 'Safe Harbor' Provisions
of the Private Securities Litigation Reform Act of 1995" beginning on page 13.

------------------------------

ALL NUMERICAL INFORMATION CONTAINED IN THIS REPORT RELATING TO THE
COMPANY'S COMMON STOCK REFLECTS THE TWO-FOR-ONE SPLITS OF THE COMPANY'S COMMON
STOCK EFFECTED IN JULY 1997 AND IN JANUARY 1998, RESPECTIVELY.

------------------------------

ITEMS 1 AND 2. BUSINESS AND PROPERTIES.

OVERVIEW

Patterson is one of the leading providers of domestic land drilling
services to major and independent oil and natural gas companies. Formed in 1978
and reincorporated in 1993 as a Delaware corporation, the Company focuses its
operations in Texas, New Mexico, Oklahoma, Louisiana and Utah. The Company
currently has a drilling fleet of 119 drilling rigs, 114 of which are currently
operable. The Company is also engaged in the development, exploration,
acquisition and production of oil and natural gas and provides contract drilling
fluid services to other oil and natural gas operators.

CONTRACT DRILLING OPERATIONS. The Company has established a reputation for
reliable, high quality drilling equipment and well-trained crews. The Company
continually seeks to modify and upgrade its equipment to maximize the
performance and capabilities of its drilling rig fleet, which the Company
believes provides it with a competitive advantage. Additionally, the Company has
the in-house capability to design, manufacture, repair and modify its drilling
rigs. Of the Company's drilling rigs, 67 are capable of drilling to depths of
12,000 feet and greater, including 25 that are capable of drilling to 15,000
feet and greater. During the fiscal year ended December 31, 1999, the Company
drilled 842 wells for 189 non-affiliated customers maintaining an average
utilization rate of 45%.

Over the past six years, the Company's operations have expanded
significantly through a series of acquisitions. Since 1993, the Company has
increased its contract drilling fleet by 106 drilling rigs. From 1993 (prior to
giving effect to the 1996 merger with Tucker Drilling Company, Inc. which was
treated as a pooling of interests for financial accounting purposes) through
1999, the Company's consolidated operating revenues increased from $25.0 million
to $151.5 million.

OIL AND NATURAL GAS OPERATIONS. The Company's oil and natural gas
activities are designed to complement its land drilling operations and diversify
the Company's overall business strategy. These activities are primarily focused
in mature producing regions in the Permian Basin and South Texas. Oil and
natural gas operations comprised approximately 6% of the Company's consolidated
operating revenues for the year ended

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December 31, 1999. At December 31, 1999, the Company's proved developed reserves
were approximately 1.9 million BOE and had a present value (discounted at 10%
before income taxes) of estimated future net revenues of approximately $17.2
million. For the year ended December 31, 1999, the Company incurred an
approximate $275,000 impairment charge to its oil and natural gas properties
which was primarily attributable to a change in the respective reserve estimate.

The Company's business strategy for its oil and natural gas operations is
to increase its oil and natural gas reserves primarily through developmental and
exploratory drilling in producing areas. Although Patterson from time to time
will participate through a working interest in exploratory drilling, the focus
of the Company's drilling activities for the foreseeable future will be
exploration and development drilling in the Permian Basin of West Texas and
Southeastern New Mexico and in South Texas.

DRILLING FLUID OPERATIONS. The Company also provides contract drilling
fluid services to numerous operators in the oil and natural gas industry.
Operating revenues derived from these activities constitute approximately 8% of
the Company's consolidated operating revenues. Patterson believes that these
contract services integrate well with its other core operating activities. The
drilling fluid operations were added by the Company with its acquisition of Lone
Star Mud, Inc. during January 1998 and Tejas Drilling Fluids, Inc. in September
1998.

The Company's corporate headquarters are located at 4510 Lamesa Highway,
Snyder, Texas, and its telephone number at that address is (915) 573-1104. The
Company also has small offices in Austin, Houston, Midland, San Angelo, Corpus
Christi, LaGrange and Kilgore, Texas, Hobbs, New Mexico, Vernal, Utah, and
Oklahoma City, Oklahoma and twelve yard facilities variously located in its
areas of operations.

BUSINESS STRATEGY

The Company's strategy is to increase cash flow and earnings per share by
enhancing its position as a leading domestic land drilling contractor. The
principal components of this strategy are as follows:

STRONG INDUSTRY REPUTATION. The Company believes that it has a strong
reputation within its existing markets for providing well maintained equipment,
high quality service and experienced personnel. The Company intends to build on
existing customer relationships in each of its areas of operation by offering
technically sophisticated drilling equipment and providing quality service to
its customers with an emphasis on efficiency, dependability and safety.

HIGH QUALITY ASSET BASE. The Company's drilling rigs are maintained in good
operating condition through an established program of modifications and
upgrades. The Company believes that the quality and operating condition of its
drilling equipment allow it to maximize utilization rates and pricing.

CONTINUED GROWTH THROUGH ACQUISITION. The Company believes that attractive
acquisition opportunities continue to exist to further expand its drilling rig
fleet in its core geographic operating areas as well as into other areas.
Following an acquisition, the Company refurbishes the acquired drilling rigs to
the Company's standards of quality and dependability.

EFFICIENT OPERATIONS. Based on publicly available information, the Company
believes that it had one of the most competitive ratios of EBITDA to revenues in
the U.S. land drilling industry during 1999. The Company has produced these
results from the combination of providing premium contract drilling services and
operating under an efficient cost structure. In addition, the Company has
achieved cost reductions and efficiencies through acquisition related synergies.
Furthermore, the Company uses its fleet of trucks and trailers to rig down,
transport and rig up its drilling rigs, which further increases efficiency by
reducing the time and costs associated with these ancillary operations.

RECENT ACQUISITION

On January 27, 1999, the Company completed the acquisition of five drilling
rigs and other related equipment from a privately held, non-affiliated entity
based in Corpus Christi, Texas. The purchase price consisted of 800,000 shares
of the Company's stock at a guaranteed value of $5.00 per share. As part of the

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4

acquisition agreement, the Company had the option exercisable on February 1,
2000 to buy back 300,000 of the 800,000 shares at $5.50 per share. The Company
exercised the option on February 1, 2000. The fair market value of the drilling
rigs and related equipment was estimated and the purchase price of $4.0 million,
representing the guaranteed value of the Company's common stock, was allocated
among such assets.

INDUSTRY SEGMENTS

The Company's revenues, operating profits and identifiable operating assets
are primarily attributable to three industry segments: (i) contract drilling,
(ii) oil and natural gas exploration, development, acquisition and production
and (iii) contract drilling fluid services. The contract drilling segment
operated at a profit during the years ended December 31, 1997 and December 31,
1998 and at a loss for the year ended December 31, 1999. The oil and natural gas
segment operated at a profit for the years ended December 31, 1997 and 1999 and
at a loss for the year ended December 31, 1998. The drilling fluids segment
generated an operating profit for the year ended December 31, 1998 and an
operating loss for the year ended December 31, 1999. See "Management's
Discussion and Analysis of Financial Condition and Results of Operations" and
Note 14 of Notes to Consolidated Financial Statements included as a part of
Items 7 and 8, respectively, of this Report for financial information pertaining
to these industry segments.

CONTRACT DRILLING OPERATIONS

GENERAL. The Company markets its contract drilling services to major oil
companies and independent oil and natural gas producers. The Company owns 119
drilling rigs, 114 of which are currently operable. Currently, 90 of the
operable drilling rigs are based in Texas (53 in west Texas, 22 in south Texas,
11 in east Texas and four in north Texas), 10 are based in New Mexico, four in
Oklahoma, four in Louisiana, three in Utah, two in Mississippi and one in
Alabama. The drilling rigs have rated maximum depth capabilities ranging from
8,000 feet to 25,000 feet.

The drilling rigs are equipped with engines, drawworks or hoists, derricks
or masts, pumps to circulate the drilling fluid (mud), blowout preventers, drill
string (pipe) and related equipment. Depth of the well and drill site conditions
are the principal factors in determining the size and type of drilling rig used
for a particular job. The Company's drilling rigs are utilized for both
exploration and development drilling and can be used for either vertical or
horizontal drilling.

In order to drill a well, the operator of the well assembles a number of
different contractors to provide the necessary services. Included among these
contractors are the drilling contractors, such as the Company, as well as other
contractors specializing in such matters as logging, completion and, in the case
of horizontal wells, specialists in the technical aspects of such drilling.

The Company has achieved its current position as a leading provider of
contract drilling services in its areas of operations by providing high quality
services to its customers at competitive rates. Although generally of lesser
importance than price, the Company believes that the condition of a drilling
fleet, the reputation of the contract driller and the quality and experience of
the drilling supervisors in the field are of significant importance to
prospective customers. The Company has and will continue to strive to maintain
its drilling fleet in good working condition. In addition to normal repair and
maintenance expenses, the Company spends significant funds each year on an
ongoing program of modifying and upgrading its drilling rigs. The Company also
strives to employ experienced and dedicated drilling supervisors for its various
drilling rigs in the field. The Company intends to continue its ongoing rig
maintenance program and to continue to retain high quality, experienced drilling
supervisors in order to build upon its reputation in the market place. In
addition, if favorable opportunities arise, the Company may seek to further
expand its drilling rig fleet through selected acquisitions.

DRILLING CONTRACTS. Most of the Company's drilling contracts are with
established customers and are obtained on a competitive bid basis, although some
contracts are obtained on a negotiated basis. Generally, the contracts are
entered into for short-term periods and cover the drilling of a single well with
the terms and rates varying depending upon the nature and duration of the work,
the equipment and services supplied and other

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5

matters. The contracts obligate the Company to pay certain operating expenses,
including wages of drilling personnel and maintenance expenses and to furnish
incidental drilling rig supplies and equipment. The contracts are subject to
termination by the customer on short notice, usually upon payment of a fee. The
Company generally indemnifies its customers against claims by the Company's
employees and claims arising from surface pollution caused by spills of fuel,
lubricants and other solvents within the control of the Company. These customers
generally indemnify the Company against claims arising from other surface and
subsurface pollution, except claims arising from the Company's gross negligence.

The contracts provide for compensation to the Company on a daywork, footage
or turnkey basis, or a combination thereof, with rates bid by the Company which
are dependent upon the anticipated complexity of drilling the well, the on-site
drilling conditions, the type of equipment to be used, the Company's estimate of
the risks involved and the estimated duration of the work to be performed, among
other considerations. All of the horizontal wells drilled by the Company have
been done either on a turnkey or footage basis to the point where the vertical
drilling ends and horizontal drilling begins, and on a daywork basis beyond that
point.

Under daywork contracts, the Company provides the drilling rig, including
the required personnel, to the operator who supervises the drilling of the
contracted well. Compensation to the Company is based on a negotiated rate per
day that the drilling rig is utilized. Daywork contracts generally specify the
type of equipment to be used, the size of the hole and the depth of the proposed
well. Under a daywork contract, the Company continues to earn revenue, even
though drilling may be temporarily suspended (such as time delays for various
reasons, including stuck drill strings and blow-outs).

Footage contracts usually require the Company to bear some of the drilling
costs in addition to providing the drilling rig. Under a footage contract, the
Company would normally determine the manner of drilling and type of equipment to
be used, subject to certain customer specifications, and also would bear the
risk and expense of mechanical malfunctions, equipment shortages and other
delays arising from drilling problems. Compensation is based on a
rate-per-foot-drilled basis at completion of the well. Prices of both footage
and daywork contracts vary depending upon various factors such as the location,
depth, duration and complexity of the well to be drilled, operating conditions
and other factors peculiar to each proposed well.

Under turnkey contracts, the Company contracts to drill a well to a
contract depth under specified conditions and provides most of the equipment and
services required. The Company bears the risk of drilling the well to the
contract depth and is usually compensated substantially more than on wells
drilled on a daywork or footage basis because the Company assumes substantially
greater economic risk associated with drilling operations. If severe drilling
problems are encountered in drilling wells under turnkey contracts, the Company
could sustain substantial losses.

The following table sets forth for each of the periods indicated the
approximate percentage of the Company's drilling revenues attributable to
daywork, footage and turnkey contracts:

<TABLE>
<CAPTION>
YEAR ENDED
DECEMBER 31,
------------------
TYPE OF REVENUES 1997 1998 1999
- ---------------- ---- ---- ----
<S> <C> <C> <C>
Daywork..................................................... 62% 64% 58%
Footage..................................................... 35 24 22
Turnkey..................................................... 3 12 20
</TABLE>

Contract drilling operations depend on the availability of drill pipe, bits
and other related equipment, fuel and qualified personnel, some of which have
been in short supply from time to time. As favorable buying opportunities arise,
the Company stockpiles bits and other drilling rig parts.

The Company's ability to drill wells for which it has contracts may be
delayed by inclement weather. Sustained periods of inclement weather may have a
material adverse effect on the Company's revenues and cash flows.

5
6

CONTRACT DRILLING ACTIVITY. The following table sets forth certain
information regarding the Company's contract drilling activity for each of the
years in the three year period ended December 31, 1999.

<TABLE>
<CAPTION>
DECEMBER 31,
YEAR ENDED
--------------------
1997 1998 1999
---- ---- ----
<S> <C> <C> <C>
Number of wells drilled..................................... 1,115 1,028 842
Average rigs available for service.......................... 73 106 114
Average rig utilization rate(1)............................. 89% 54% 45%
</TABLE>

- ---------------

(1) Rig utilization is based on a 365-day year for rigs available for service
during the periods indicated. A rig is utilized when it is operating or
being moved, assembled or dismantled under contract.

CUSTOMERS. For the year ended December 31, 1999, the Company drilled wells
for 189 nonaffiliated customers. This compares with 251 nonaffiliated customers
for the year ended December 31, 1998. No single customer accounted for 10% or
more of the Company's consolidated operating revenues for the fiscal year ended
December 31, 1999. The Company does not believe that the loss of any one
customer would have a material adverse effect on the Company's operations.

The Company's customers in the past 12 months have included, among others,
Abraxas Petroleum Corporation, Apache Corporation, ARCO Permian, The Houston
Exploration Company, Chevron U.S.A. Production Company, Cobra Oil and Gas
Corporation, Louis Dreyfuss Natural Gas, EOG Resources, Mitchell Energy
Corporation, Texaco Exploration & Production Inc., Phillips Petroleum Company,
Santa Fe Energy Corporation and Union Pacific Resource Company.

As of December 31, 1999 the Company was drilling a total of 71 wells, four
of which were being drilled for affiliated parties.

DRILLING RIGS AND RELATED EQUIPMENT. The following table provides certain
information concerning the drilling rigs owned by the Company:

<TABLE>
<CAPTION>
DEPTH RATING (FT.) MECHANICAL DIESEL ELECTRIC
- ------------------ ---------- ---------------
<S> <C> <C>
8,000 to 9,999.............................................. 26(1) --
10,000 to 11,999............................................ 26 --
12,000 to 14,999............................................ 40 2
15,000 and greater.......................................... 16(2) 9
---- --
Totals............................................ 108 11
==== ==
</TABLE>

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(1) Includes 3 inoperable rigs.

(2) Includes 2 inoperable rigs.

The Company owns 113 trucks and 152 trailers. This equipment is used to rig
down, transport and rig up the Company's drilling rigs which minimizes the
Company's dependency upon third parties for these ancillary services and further
enhances the efficiency of the Company's contract drilling operations.

Most repair work and overhaul of the Company's drilling rig equipment is
performed at the Company's yard facilities variously located in Texas, New
Mexico and Oklahoma. The Company believes that its operable drilling rigs and
related equipment are in good operating condition. In addition to normal repair
and maintenance expenses, the Company historically has spent significant funds
for its ongoing program of modifying and upgrading its equipment.

6
7

OIL AND NATURAL GAS OPERATIONS

GENERAL. The Company has been engaged in the development, exploration,
acquisition and production of oil and natural gas since 1982. The Company's oil
and natural gas activities have been designed to complement its land drilling
operations and are primarily concentrated in two operating areas: (i) the
Permian Basin of west Texas and southeast New Mexico and (ii) South Texas.

The Company's strategy for its oil and natural gas operations is to
increase its reserve base primarily through development drilling, as well as
selected acquisitions of leasehold acreage and producing properties. At December
31, 1999, the Company was the operator of 155 wells, of which it was the
drilling contractor for 143 wells.

OIL AND NATURAL GAS RESERVES. The Company engaged M. Brian Wallace, P.E.,
Dallas, Texas, an independent petroleum engineer, to estimate the Company's
proved developed reserves, projected future production and estimated future net
revenues from such proved developed reserves as of December 31, 1997, 1998 and
1999. Mr. Wallace's estimates were based upon a review of production histories
and other geologic, economic, ownership and engineering data provided by the
Company. In determining the estimates of the reserve quantities that are
economically recoverable, Mr. Wallace used oil and natural gas prices and
estimated average development and production costs provided by the Company.

The following table sets forth information as of the end of each of the
years in the three year period ended December 31, 1999, derived from the reserve
reports of Mr. Wallace. The present values (discounted at 10% before income
taxes) of estimated future net revenues shown in the table are not intended to
represent the current market value of the estimated oil and natural gas reserves
owned by the Company. For further information concerning the present value of
estimated future net revenue from these proved developed reserves, see Note 19
of Notes to Consolidated Financial Statements included as a part of Item 8 of
this Report.

<TABLE>
<CAPTION>
AS OF DECEMBER 31,
--------------------------
1997 1998 1999
---- ---- ----
(IN THOUSANDS)
<S> <C> <C> <C>
Proved Developed Reserves:
Oil (Bbls)............................................. 945 946 1,205
Gas (Mcf).............................................. 3,788 3,490 4,118
Total (BOE)............................................ 1,576 1,528 1,891
Estimated future net revenue before income taxes......... $15,012 $9,232 $24,741
Present value of estimated future net revenues before
income taxes, discounted at 10%........................ $11,422 $6,770 $17,240
</TABLE>

The reserve data set forth above represents only estimates. The estimates
are based on various assumptions and, therefore, are inherently imprecise.
Actual future production, revenues, taxes, production costs and development
costs may vary substantially from those assumed in the estimates. Any
significant variance could materially affect the estimates set forth in this
Form 10-K. In addition, the reserve data may be subject to upward or downward
revisions depending upon, among other factors, production history and prevailing
oil and natural gas prices. Oil and natural gas prices have fluctuated widely in
recent years. There is no assurance that prices will be higher or lower than
prices used in estimating the Company's reserves.

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8

PRODUCTION. The Company's wells in South Texas primarily produce natural
gas and in the Permian Basin primarily produce oil. The following table sets
forth the Company's net oil and natural gas production, average sales price and
average production (lifting) costs associated with such production during the
periods indicated.

<TABLE>
<CAPTION>
YEAR ENDED DECEMBER 31,
------------------------
1997 1998 1999
---- ---- ----
<S> <C> <C> <C>
Average net daily production:
Oil (Bbls)............................................... 1,159 835 698
Gas (Mcf)................................................ 4,024 2,742 2,745
Total (BOE).............................................. 1,830 1,292 1,156
Average sales prices:
Oil (per Bbl)............................................ $17.86 $12.16 $18.08
Gas (per Mcf)............................................ 2.19 1.93 2.22
Average production (lifting) costs (per BOE)............. $ 3.41 $ 4.08 $ 4.08
</TABLE>

PRODUCTIVE WELLS. The following table sets forth information regarding the
number of productive wells in which the Company held a working interest as of
December 31, 1999. One or more completions in the same well bore are counted as
one well.

<TABLE>
<CAPTION>
PRODUCTIVE WELLS
----------------
GROSS NET
----- ---
<S> <C> <C>
Oil......................................................... 194 63.83
Gas......................................................... 75 8.54
--- -----
Total............................................. 269 72.37
=== =====
</TABLE>

DEVELOPED AND UNDEVELOPED ACREAGE. The following table sets forth the
developed and undeveloped acreage in which the Company owned a working or
leasehold interest as of December 31, 1999:

<TABLE>
<CAPTION>
DEVELOPED UNDEVELOPED
--------------- ----------------
LOCATION GROSS NET GROSS NET
-------- ----- --- ----- ---
<S> <C> <C> <C> <C>
South Texas...................................... 34,044 6,608 60,326 14,374
Permian Basin.................................... 20,164 3,452 40,270 8,619
------ ------ ------- ------
Total.................................. 54,208 10,060 100,596 22,993
====== ====== ======= ======
</TABLE>

Many of the leases summarized in the table above as undeveloped acreage
will expire at the end of their respective primary terms unless production has
been obtained from the acreage subject to the lease prior to that date, in which
event the lease will remain in effect until the cessation of production. The
following table sets forth the gross and net acres subject to leases summarized
in the table of undeveloped acreage that will expire.

<TABLE>
<CAPTION>
LEASE ACRES EXPIRING
---------------------
GROSS NET
----- ---
<S> <C> <C>
Period ending:
December 31, 2000........................................... 50,196 10,886
December 31, 2001........................................... 19,268 4,651
December 31, 2002 and later................................. 31,132 7,456
------- ------
Total............................................. 100,596 22,993
======= ======
</TABLE>

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9

DRILLING ACTIVITIES. The following table set forth the results of the
Company's participation in the drilling of development and exploratory wells
during each of the years ended December 31, 1997, 1998 and 1999.

<TABLE>
<CAPTION>
DEVELOPMENT WELLS EXPLORATORY WELLS
---------------------------- ---------------------------
PRODUCTIVE DRY HOLES PRODUCTIVE DRY HOLES
YEAR ENDED ------------- ------------ ------------ ------------
DECEMBER 31, GROSS NET GROSS NET GROSS NET GROSS NET
------------ ----- --- ----- --- ----- --- ----- ---
<S> <C> <C> <C> <C> <C> <C> <C> <C>
1997........................................ 24 5.44 8 1.53 7 1.13 15 3.06
1998........................................ 23 4.45 6 1.74 3 .55 13 2.16
1999........................................ 27 5.21 7 1.71 8 1.00 4 .48
-- ----- -- ---- -- ---- -- ----
Total.................................. 74 15.10 21 4.98 18 2.68 32 5.70
== ===== == ==== == ==== == ====
</TABLE>

MARKETING OF CRUDE OIL AND NATURAL GAS. Crude oil is sold based upon 30-day
automatically renewable contracts with oil purchasers. Prices vary as world oil
prices fluctuate. Due to competitive conditions, the Company does not believe
that the loss of any one of its major crude oil purchasers would have a material
adverse effect on its business. The Company markets oil produced from Company
operated wells through a wholly-owned subsidiary. During the year, a company
owned in part by a relative of Cloyce A. Talbott, the Company's Chairman and
Chief Executive Officer, served as a first purchaser of substantially all of the
oil produced from Company-operated leases. See Note 17 of Notes to Consolidated
Financial Statements included as a part of Item 8 of this Report.

Most of the Company's natural gas is sold through third-party natural gas
brokers at spot market prices and is transported to market by interstate
pipelines. Contracts with these brokers are currently for less than five years
and allow for prices to adjust to the marketplace. The Company believes that
because of the competitive nature of the industry today, the loss of any one of
its natural gas purchasers would not have a material adverse effect on its
business. While the Company has not experienced any inability to market its
natural gas, if transportation space in the pipelines is restricted or is
unavailable, the Company's cash flow could be adversely affected.

No customer for oil and natural gas accounted for more than 10% of the
Company's consolidated revenues for the year ended December 31, 1999.

TITLE TO OIL AND NATURAL GAS PROPERTIES. Title to the Company's oil and
natural gas properties is subject to royalty, overriding royalty, carried
working, and other similar interests and cost sharing arrangements customary in
the oil and natural gas industry (including farmout agreements, operating
agreements and joint venture arrangements), liens for current taxes not yet due,
and to other minor defects and encumbrances. The Company believes that such
burdens do not materially detract from the value of such properties or from the
Company's interest therein or materially interfere with the operation of the
Company's business.

As is customary in the oil and natural gas industry in the case of
undeveloped properties, an in-house title review is made prior to or at the time
of acquisition. More comprehensive title investigations, including in most cases
receipt of a title opinion of legal counsel, are generally made before
commencement of drilling operations on undeveloped properties and also are
generally made before consummation of an acquisition of developed properties.

COMPETITION

CONTRACT DRILLING OPERATIONS. The contract drilling industry is highly
competitive. Price is generally the most important competitive factor in the
drilling industry. Other competitive factors include the availability of
drilling equipment and experienced personnel at or near the time and place
required by customers, the reputation of the drilling contractor in the drilling
industry and its relationship with existing customers. The Company believes that
it competes favorably with respect to all of these factors. Competition is
usually on a regional basis, although drilling rigs are mobile and can be moved
from one region to another in response to increased demand. An oversupply of
drilling rigs in any region may result. Demand for land drilling equipment is
also dependent on the exploration and development programs of oil and natural
gas companies, which are in

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turn influenced primarily by the financial condition of such companies, by
general economic conditions, by prices of oil and natural gas and, from time to
time, by political considerations and policies.

It is impracticable to estimate the number of contract drilling competitors
of the Company, some of which have substantially greater resources and longer
operating histories than the Company. Also, in recent years, many drilling
companies have consolidated or merged with other companies. Although this
consolidation has decreased the total number of competitors, management of the
Company believes that competition for drilling contracts will continue to be
intense for the foreseeable future.

OIL AND NATURAL GAS OPERATIONS. There is substantial competition for the
acquisition of oil and natural gas leases suitable for exploration and for the
hiring of experienced personnel. The Company's competitors in oil and natural
gas exploration, development and production include major integrated oil and
natural gas companies, numerous independent oil and natural gas companies,
drilling and production purchase programs and individual producers and
operators. The ability of the Company to increase its holdings of oil and
natural gas reserves in the future is directly dependent upon the Company's
ability to select, acquire and develop suitable prospects in competition with
these companies. Many competitors have financial resources, staffs, facilities
and other resources significantly greater than those of the Company.

GOVERNMENT REGULATION AND ENVIRONMENTAL

The domestic drilling of oil and natural gas wells is subject to numerous
state and federal laws, rules and regulations. State statutory provisions
relating to oil and natural gas generally include requirements as to well
spacing, waste prevention, production limitations, disposal of produced waters,
pollution prevention and clean-up, obtaining drilling permits and similar
matters. Within the state of Texas, where substantially all of the Company's
operations are currently conducted, these regulations are principally enforced
by the Texas Railroad Commission. To date, the Company has not been required to
expend significant resources in order to satisfy applicable environmental laws
and regulations. The Company does not anticipate any material capital
expenditures for environmental control facilities or extraordinary expenditures
associated with compliance with environmental rules and regulations in the
foreseeable future. However, compliance costs under existing laws or under any
new requirements could become material and the Company could incur liability for
noncompliance. The Company has not been fined or incurred liability for
noncompliance, pollution or other environmental damage in connection with its
operations and is not currently aware of any environmental hazards which would
materially affect its operations.

The contract drilling industry is dependent on demand for services from the
oil and natural gas exploration industry and, accordingly, is affected by
changing tax laws, price controls and other laws relating to the energy business
generally. The Company's business is affected generally by political
developments and by federal, state, foreign and local laws and regulations,
which relate to the oil and natural gas industry. The adoption of laws and
regulations affecting the oil and natural gas industry for economic,
environmental and other policy reasons could increase costs relating to drilling
and production, which could have an adverse effect on the Company's operations.
Several state and federal environmental laws and regulations currently apply to
the Company's operations and may become more stringent in the future. Although
the Company has utilized operating and disposal practices that were or are
currently standard in the industry, hydrocarbons and other materials may have
been disposed of or released in or under properties currently or formerly owned
or operated by the Company or its predecessors in interest. In addition, some of
these properties have been operated by third parties over whom the Company has
no control as to such entities' treatment of hydrocarbon and other materials an
the manner in which such materials may have been disposed of or released. The
federal Comprehensive Environmental Response Compensation and Liability Act of
1980, as amended by the Superfund Amendments and Reauthorization Act of 1986
(collectively, "CERCLA"), and comparable state statutes impose strict liability
on owners and operators of sites and on persons who disposed of or arranged for
the disposal of "hazardous substances" found at sites. The federal Resource
Conservation and Recover Act ("RCRA") and comparable state statutes govern the
disposal of "hazardous wastes." Although CERCLA currently excludes petroleum
from the definition of "hazardous substances," and RCRA also excludes certain
classes of exploration and production wastes from regulation, such exemptions by
Congress under both CERCLA and RCRA may be deleted, limited or modified in the
future. If such changes are made to
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CERCLA and/or RCRA, the Company could be required to remove and remediate
previously disposed of materials (including materials disposed of or released by
prior owners or operators) from properties (including ground water contaminated
with hydrocarbons) and to perform removal or remedial actions to prevent future
contamination.

The Federal Water Pollution Control Act ("FWPCA") and the Oil Pollution Act
of 1990 ("OPA") and implementing regulations govern the prevention of
discharges, including oil and produced water spills, and liability for damages
into waters. The OPA is more comprehensive and stringent than previous oil
pollution liability and prevention laws and imposes strict liability for a
comprehensive and expansive list of damages from an oil spill into waters from
facilities. Liability may be imposed for oil removal costs and a variety of
public and private damages. Penalties may also be imposed for violation of
federal safety, construction and operating regulations, and for failure to
report a spill or to cooperate fully in a clean-up. The OPA also expands the
authority and capability of the federal government to direct and manage oil
spill clean-up and operations, plus requires operators to prepare oil spill
response plans in cases where it can reasonably be expected that substantial
harm will be done to the environment by discharges on or into navigable waters.
The Company has spill protection control countermeasure (SPCC) plans in place
for its oil and natural gas properties in each of the areas in which it
operates. Failure to comply with ongoing requirements or inadequate cooperation
during a spill event may subject a responsible party to civil or criminal
actions. Although the liability for owners and operators is the same under the
FWPCA, the damages recoverable under the OPA are potentially much greater and
can include natural resource damages.

The operations of the Company are also subject to federal, state and local
regulations for the control of air emissions. The federal Clean Air Act ("CAA"),
as amended, and various state and local laws impose certain air quality
requirements on the Company. Amendments to the CAA revised the definition of
"major source" such that emissions from both wellhead and associated equipment
involved in oil and gas production may be added to determine if a source is a
"major source." As a consequence, more facilities may become major sources and
thus would be required to obtain operating permits. This permitting process may
require capital expenditures in order to comply with permit limits.

RISKS AND INSURANCE

The Company's operations are subject to the many hazards inherent in the
drilling business, including blow-outs, cratering, fires and explosions. These
hazards could cause personal injury or death, suspend drilling operations or
seriously damage or destroy the equipment involved and, in addition to
environmental damage, could cause substantial damage to producing formations and
surrounding areas. Damage to the environment, including property contamination
in the form of either soil or ground water contamination, could also result from
the Company's operations, particularly through oil or produced water spillage,
natural gas leaks and extensive, uncontrolled fires. In addition, the Company
could become subject to liability for reservoir damages. The occurrence of a
significant event, including pollution or environmental damages, could
materially affect the Company's operations and financial condition. As a
protection against operating hazards, the Company maintains insurance coverage
considered by the Company to be adequate, including all-risk physical damages,
employer's liability, commercial general liability and workers compensation
insurance. The Company currently has general liability insurance of $2.0 million
per occurrence with an aggregate of $2.0 million and excess liability and
umbrella coverage's of up to $40.0 million per occurrence with a $40.0 million
aggregate. The Company's customers generally require the Company to have at
least $1.0 million of third party liability coverage. Since April 1, 1992, the
Company has carried workers' compensation insurance, with a deductible of
$100,000 per occurrence. If multiple workers' compensation claims are filed, the
Company could incur significant expenses, which in turn could have a material
adverse impact on its financial condition and operations.

The Company believes that it is adequately insured for public liability and
property damage to others with respect to its operations. However, such
insurance may not be sufficient to protect the Company against liability for all
consequences of well disasters, extensive fire damage or damage to the
environment. The Company also carries insurance to cover physical damage to or
loss of its drilling rigs; however, it does not carry insurance against loss of
earnings resulting from such damage or loss. In view of the difficulties that
may
11
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be encountered in renewing such insurance at reasonable rates, no assurance can
be given that the Company will be able to maintain the type and amount of
coverage that it considers adequate at reasonable rates or that any particular
types of coverage will be available.

EMPLOYEES

The Company employed approximately 1,546 full-time persons (73 office
personnel and 1,473 field personnel) at December 31, 1999. The number of
drilling rig employees will fluctuate depending upon the number of operable
drilling rigs and the demand for contract drilling services. The Company
considers its employee relations to be satisfactory. None of the Company's
employees is represented by a union.

ITEM 3. LEGAL PROCEEDINGS.

The Company is party to various legal proceedings arising in the normal
course of its business. Management of the Company does not believe that the
outcome of these proceedings will have a material adverse effect on the
financial condition of the Company.

ITEM 4. SUBMISSION OF MATTERS TO A VOTE OF SECURITY HOLDERS.

None.

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------------------------------

CAUTIONARY STATEMENT FOR PURPOSES OF THE "SAFE HARBOR"
PROVISIONS OF THE PRIVATE SECURITIES LITIGATION REFORM ACT OF 1995

The Company is including the following cautionary statement to take
advantage of the "safe harbor" provisions of the Private Securities Litigation
Reform Act of 1995 for any forward-looking statement made by, or on behalf of,
the Company. The factors identified in this cautionary statement are important
factors (but not necessarily all of the important factors) that could cause
actual results to differ materially from those expressed in any forward-looking
statement made by, or on behalf of, the Company. Where any such forward-looking
statement includes a statement of the assumptions or bases underlying such
forward-looking statement, the Company cautions that, while it believes such
assumptions or bases to be reasonable and makes them in good faith, assumed
facts or bases almost always vary from actual results, and the differences
between assumed facts or bases and actual results can be material, depending
upon the circumstances. Where, in any forward-looking statement, the Company, or
its management, expresses an expectation or belief as to the future results,
such expectation or belief is expressed in good faith and believed to have a
reasonable basis, but there can be no assurance that the statement of
expectation or belief will result, or be achieved or accomplished. Taking into
account the foregoing, the following are identified as important risk factors
that could cause actual results to differ materially from those expressed in any
forward-looking statement made by, or on behalf of, the Company:

PATTERSON IS DEPENDENT ON THE OIL AND NATURAL GAS INDUSTRY AND MARKET PRICES FOR
OIL AND NATURAL GAS. DECLINES IN OIL AND NATURAL GAS PRICES HAVE ADVERSELY
AFFECTED PATTERSON'S OPERATIONS.

Patterson's revenue, profitability and rate of growth are substantially
dependent upon prevailing prices for oil and natural gas. In recent years, oil
and natural gas prices and, therefore, the level of drilling, exploration,
development and production, have been extremely volatile. Prices are affected by
market supply and demand factors as well as international military, political
and economic conditions and the ability of the Organization of Petroleum
Exporting Countries to set and maintain production and prices. All of these
factors are beyond our control. Low level commodity prices beginning in the
fourth quarter of 1997 and continuing into mid-1999 have materially adversely
affected our operations. We expect oil and natural gas prices to continue to be
volatile and to effect our financial condition and operations and ability to
access sources of capital.

INDUSTRY CONDITIONS FOR CONTRACT DRILLING SERVICES HAVE BEEN POOR FOR MUCH OF
THE TIME SINCE MID-1982.

The contract drilling business experienced increased demand for drilling
services from 1995 through the third quarter of 1997 due to stronger oil and
natural gas prices. However, except for that period and other occasional
upturns, the market for onshore contract drilling services has generally been
depressed since mid-1982. Since this time and except during the occasional
upturns, there have been substantially more drilling rigs available than
necessary to meet demand in most operating and geographic segments of the
domestic drilling industry. As a result, drilling contractors have had
difficulty sustaining profit margins.

In addition to adverse effects that future declines in demand could have on
Patterson, ongoing movement of drilling rigs from region to region or
reactivation of onshore drilling rigs or new construction of drilling rigs could
adversely effect utilization rates and pricing, even in an environment of
stronger oil and natural gas prices and increased drilling activity. We cannot
predict either the future level of demand for our contract drilling services or
future conditions in the contract drilling business. Notwithstanding the
significant improvement in oil and natural gas prices since mid-1999, the demand
for contract drilling services, although improving, remains relatively weak.
There can be no assurance that the demand for contract drilling services will
increase proportionally with the current higher prices or of the duration of the
higher commodity prices.

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SHORTAGES OF DRILL PIPE AND OTHER DRILLING EQUIPMENT COULD ADVERSELY AFFECT
PATTERSON'S DRILLING OPERATIONS.

The increase in domestic drilling demand from mid-1995 through the third
quarter of 1997 and related increase in contract drilling activity resulted in a
shortage of drill pipe in the industry. This shortage caused the price of drill
pipe to increase significantly and required that orders for new drill pipe be
placed at least one year in advance. The price increase and delay in delivery of
drill pipe caused Patterson to substantially increase capital expenditures in
its contract drilling segment. A return to higher demand levels for contract
drilling services could reinstate the problems associated with drill pipe
shortages and could cause shortages in other drilling rig parts. Severe
shortages could impair Patterson's ability to obtain the equipment required for
its contract drilling operations.

THE CONTRACT DRILLING INDUSTRY IN WHICH PATTERSON OPERATES IS HIGHLY
COMPETITIVE.

The inability to compete effectively in the contract drilling industry
would adversely impact Patterson's operations. Price is generally the most
important competitive factor. Other competitive factors include the availability
of drilling equipment and experienced personnel at or near the time and place
required by customers, the reputation of the drilling contractor and its
relationship with existing customers. We believe that we compete favorably with
respect to all of these factors. Competition is usually on a regional basis,
although drilling rigs are mobile and can be moved from one region to another in
response to increased demand. An oversupply of drilling rigs in any region may
result. Demand for land drilling equipment is also dependent on the exploration
and development budgets of oil and natural gas companies, which are in turn
influenced primarily by the financial condition of such companies, by general
economic conditions, by prices of oil and natural gas, and from time to time
political considerations and policies. It is not practical to estimate the
number of contract drilling competitors of Patterson, some of which have
substantially greater resources than Patterson. Also, in recent years, many
drilling companies have consolidated or merged with other companies. Although
this consolidation has decreased the total number of competitors, Patterson
believes the competition for drilling services will continue to be intense.

There is also substantial competition for the acquisition of oil and
natural gas leases suitable for exploration and for the hiring of experienced
personnel. Patterson's competitors in the exploration, development and
production segment of its operations include major integrated oil and natural
gas companies, numerous independent oil and natural gas companies, drilling and
production purchase programs and individual producers and operators. Patterson's
ability to increase its holdings of oil and natural gas reserves in the future
is directly dependent upon its ability to select, acquire and develop suitable
prospects in competition with those companies. Many competitors have financial
resources, staff, facilities and other resources significantly greater than
those of Patterson.

LABOR SHORTAGES COULD ADVERSELY AFFECT PATTERSON'S DRILLING OPERATIONS.

The increase in domestic drilling demand from mid-1995 through the third
quarter of 1997 and related increase in contract drilling activity caused a
shortage of qualified drilling rig personnel in the industry. This increase
adversely impaired our ability to attract and retain sufficient qualified
personnel and to market and operate our drilling rigs. Further, the labor
shortages resulted in wage increases, which impacted our operating margins. A
return to higher demand levels for contract drilling services could reinstate
the problems associated with labor shortages.

PATTERSON HAS SIGNIFICANT BORROWINGS; FAILURE TO REPAY COULD RESULT IN
FORECLOSURE ON DRILLING RIGS.

Patterson has a $60 million credit facility with an outstanding principal
balance of $50 million at March 31, 2000. All of Patterson's drilling assets are
pledged as collateral on the facility. The loan is payable in monthly payments
of interest only until February 2001, at which time the loan will convert to a
term loan with a 60-month principal and interest amortization. A decline in
general economic conditions in the oil and gas industry could adversely affect
Patterson's ability to repay the loan. Failure to repay could, at the lender's
election, result in acceleration of the maturity date of the loan and
foreclosure on the drilling assets.

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Additionally, the loan agreement contains a number of covenants, including
financial covenants, the failure of which to satisfy could also cause
acceleration of the maturity date and require immediate repayment.

CONTINUED GROWTH THROUGH RIG ACQUISITIONS IS NOT ASSURED.

Patterson substantially increased its drilling rig fleet over the four-year
period ending in the first quarter of 1998 through strategic acquisitions.
Although the land drilling industry has experienced significant consolidation
over the past couple of years, Patterson believes that significant acquisition
opportunities are still available. However, there can be no assurance that
suitable acquisitions can be found. We are likely to continue to face intense
competition from other companies for available acquisition opportunities.

There can be no assurance that Patterson will have sufficient capital
resources to complete acquisitions, that acquisitions can be completed on terms
acceptable to us or that any completed acquisition would improve Patterson's
financial condition, results of operation, business or prospects in any material
manner. In fact, Patterson may incur substantial indebtedness to finance future
acquisitions and also may issue equity securities or convertible securities in
connection with any such acquisitions. Additional debt service requirements
could represent a significant burden on our results of operations and financial
condition and the issuance of additional equity or convertible shares could be
dilutive to our existing stockholders. Also, continued growth could strain
Patterson's management, operations, employees and resources.

PATTERSON'S OPERATIONS ARE SUBJECT TO OPERATING HAZARDS AND UNINSURED RISKS.

Contract drilling and oil and natural gas activities are subject to a
number of risks and hazards. These could cause serious injury or death to
persons, suspension of drilling operations, serious damage to equipment or
property of others, and damage to producing formations in surrounding areas. Our
operations could also cause environment damage, particularly through oil spills,
gas leaks, discharges of toxic gases or extensive uncontrolled fires. In
addition, we could become subject to liability for reservoir damages. The
occurrence of a significant event, including pollution or environmental damage,
could materially affect our operations and financial condition.

We believe we are adequately insured or indemnified against normal and
foreseeable risks in our operations in accordance with industry standards.
However, such insurance or indemnification may not be adequate to protect
Patterson against liability from all consequences of well disasters, extensive
fire damage or damage to the environment. There is no assurance that Patterson
will be able to maintain adequate insurance in the future at rates it considers
reasonable or that any particular types of coverage will be available. In
addition to insurance, Patterson generally seeks to obtain indemnity agreements
whenever possible from its customers requiring them to hold Patterson harmless
if production or reservoir damage occurs. However, even when we are successful
in obtaining contractual indemnification, the customer may not maintain adequate
insurance to support such indemnification.

VIOLATIONS OF ENVIRONMENTAL LAWS AND REGULATIONS COULD MATERIALLY ADVERSELY
AFFECT PATTERSON'S OPERATIONS.

Patterson's operations are subject to numerous domestic laws and
regulations that relate directly or indirectly to the drilling of oil and
natural gas wells, including laws and regulations controlling the discharge of
materials into the environment, requiring removal and clean-up under certain
circumstances, or otherwise relating to the protection of the environment. Laws
and regulations protecting the environment have generally become more stringent
in recent years, and may in certain circumstances impose strict liability,
rendering a person liable for environmental damage without regard to negligence
or to the fault on the part of such person. Such laws and regulations may expose
us to liability for the conduct of, or conditions caused by, others, or for our
acts that were in compliance with all applicable laws at the time such acts were
performed.

Although we generally have been able to obtain some degree of contractual
indemnification from our customers in most of our day rate drilling contracts
against pollution and environmental damages, there is no assurance that
Patterson will be able to enforce the indemnification in all instances, that the
customer will be financially able in all cases to comply with its indemnity
obligations, or that Patterson will be able to obtain
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such indemnification agreements in the future. No such indemnification is
typically available for turnkey contracts. While we also maintain insurance
coverage against certain environmental liabilities, including pollution caused
by sudden and accidental oil spills, we cannot assure that we will continue to
be able to secure or carry this insurance or, if Patterson were able to do so,
that the coverage would be adequate to cover the liabilities.

SOME OF PATTERSON'S CONTRACT DRILLING SERVICES ARE DONE UNDER TURNKEY CONTRACTS,
WHICH ARE FINANCIALLY RISKY.

A portion of Patterson's contract drilling is done under turnkey contracts,
which involve substantial risks. Under turnkey drilling contracts, Patterson
contracts to drill a well to a contract depth under specified conditions for a
fixed price. The risks to us under these types of drilling contracts are
substantially greater than on a well drilled on a daywork basis since we assume
most of the risks associated with the drilling operations generally assumed by
the operator of the well in a daywork contract, including risk of blowout,
machinery breakdowns and abnormal drilling conditions. Accordingly, if severe
drilling problems are encountered in drilling wells under a turnkey contract,
Patterson could suffer substantial losses associated with that contract.
Generally, the weaker the demand for our drilling services, the higher the
percentage of our turnkey contracts. For each of the years in the two-year
period ended December 31, 1999, the percentage of our contract drilling revenues
attributable to turnkey contracts was 12.0%, and 20.0%, respectively.

ESTIMATES OF PATTERSON'S OIL AND NATURAL GAS RESERVES ARE UNCERTAIN.

Estimates of our proved developed reserves and future net revenues are
based on engineering reports prepared by an independent petroleum engineer based
upon a review of production histories and other geologic, economic, ownership
and engineering data provided by Patterson. These estimates are based on several
assumptions that the SEC requires oil and natural gas companies to use,
including, for example, constant oil and natural gas prices. Such estimates are
inherently imprecise indications of future net revenues. Actual future
production, revenues, taxes, production costs and development costs may vary
substantially from those assumed in the estimates. Any significant variance
could materially affect the estimates. In addition, our reserves might be
subject to upward or downward adjustment based on future production, results of
future exploration and development, prevailing oil and natural gas prices and
other factors.

RISKS RELATED TO PATTERSON'S OPERATIONS

THE LOSS OF SERVICES OF KEY OFFICERS COULD HURT PATTERSON'S OPERATIONS.

Patterson is highly dependent on its executive officers and key employees.
The unexpected loss of the services of any of these individuals, particularly
Cloyce A. Talbott or A. Glenn Patterson, Chief Executive Officer and the
President, respectively, could have a detrimental affect on Patterson. Patterson
has no employment agreements with any of its executive officers. We maintain key
man life insurance on the lives of Messrs. Talbott and Patterson in the amount
of $3 million each.

ANTI-TAKEOVER MEASURES IN PATTERSON'S CHARTER DOCUMENTS AND UNDER STATE LAW
COULD DISCOURAGE AN ACQUISITION OF PATTERSON AND THEREBY AFFECT THE RELATED
PURCHASE PRICE.

Patterson, as a Delaware corporation, is subject to the Delaware General
Corporation Law, including Section 203, an anti-takeover law enacted in 1988.
Patterson has also enacted certain anti-takeover measures, including a
stockholders rights plan. In addition, our Board of Directors has the authority
to issue up to one million shares of preferred stock and to determine the price,
rights (including voting rights), conversion ratios, preferences and privileges
of that stock without further vote or action by the holders of the common stock.
As a result of these measures and others, potential acquirers of Patterson may
find it more difficult or be discouraged from attempting to effect an
acquisition transaction with us, thereby possibly depriving holders of Patterson
securities of certain opportunities to sell or otherwise dispose of such
securities at above-market prices pursuant to their transactions.

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PATTERSON HAS PAID NO DIVIDENDS ON ITS COMMON STOCK AND HAS NO PLANS TO PAY
DIVIDENDS IN THE FORESEEABLE FUTURE.

Patterson has not declared or paid cash dividends on its common stock in
the past and does not expect to declare or pay any cash dividends on its common
stock in the foreseeable future. The terms of our existing credit facility
prohibit payment of dividends by Patterson without the prior written consent of
the note holders

PARTICIPATION BY PATTERSON DIRECTORS AND OFFICERS IN OIL AND NATURAL GAS
PROSPECTS COULD CREATE CONFLICTS OF INTEREST.

Certain of Patterson's directors and executive officers and their
respective affiliates have participated and may continue to participate from
time to time in oil and natural gas prospects and properties in which Patterson
has an interest. Conflicts of interest may arise between such persons and
Patterson as to the advisability of conducting drilling and recompletion
activities on these properties. Of the 155 wells operated by Patterson at
December 31, 1999, Patterson's directors, officers and/or their respective
affiliates were working interest owners in approximately 115 wells.

PATTERSON BOARD MAY ISSUE PREFERRED STOCK WITH RIGHTS AND PREFERENCES ADVERSE TO
COMMON STOCK.

Patterson has a class of authorized preferred stock. Patterson's Board of
Directors, without stockholder approval, may issue shares of the preferred stock
with rights and preferences adverse to the voting power or other rights of the
holders of common stock. Patterson has not issued any shares of preferred stock.
However, as of December 31, 1999, an aggregate of 326,756 shares of preferred
stock had been reserved for issuance upon exercise of the Rights described under
"Description of Capital Stock -- Stockholder Rights Plan," below.

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GLOSSARY

The following are definitions of certain industry terms used in this
report:

Bbls....................... Refers to barrels of 42 U.S. gallons and represents
the basic unit for measuring the production of
crude oil and condensate.

BOE........................ Refers to barrels of oil equivalent. In reference
to natural gas, natural gas equivalents are
determined using the rate of six Mcf of natural gas
(including natural gas liquids) to one Bbl of crude
oil or condensate.

Developed Acreage.......... Lease acres spaced or assigned to productive wells.

Development Well........... A well drilled within the proved area of an oil or
gas reservoir to a depth known to be productive.

Exploratory Well........... A well drilled to find and produce oil and gas in
an unproved area, to find a new reservoir in a
field previously found to be productive of oil or
gas in another reservoir, or to extend a known
reservoir.

Gross Acre................. An acre in which a working interest is owned. The
number of gross acres is the total number of acres
in which a working interest is owned.

Gross Well................. A well in which a working interest is owned. The
number of gross wells is the total number of wells
in which a working interest is owned.

Mcf........................ Refers to a volume of 1,000 cubic feet under
prescribed conditions of pressure and temperature
and represents the basic unit for measuring volumes
of produced gas.

Net Acre................... Deemed to exist when the sum of the fractional
ownership working interests in gross acres equals
one. The number of net acres is the sum of the
fractional ownership working interests owned in
gross acres expressed as whole numbers and
fractions thereof.

Net Well................... Deemed to exist when the sum of fractional
ownership working interests in gross wells equals
one. The number of net wells is the sum of the
fractional ownership working interests owned in
gross wells expressed as whole numbers and
fractions thereof.

Productive Well............ A well that is found capable of producing oil
and/or gas in paying quantities.

Proved Reserves............ Estimated quantities of crude oil, natural gas, and
natural gas liquids which geological and
engineering data demonstrate with reasonable
certainty to be recoverable in future years from
known reservoirs under existing economic
conditions; i.e., prices and costs as of the date
the estimate is made.

Proved Developed
Reserves................... Proved oil and gas reserves which can be expected
to be recovered through existing wells with
existing equipment and operating methods.

Undeveloped Acreage........ Leased acres on which wells have not been drilled
or completed to a point that would permit the
production of commercial quantities of oil and gas,
regardless of whether such acreage contains proved
reserves.

Working Interest........... The operating interest under a lease, the owner of
which has the right to explore for and produce oil
and gas covered by the lease. The full working
interest bears 100% of the costs of exploration,
development, production and operation, and is
entitled to the portion of the gross proceeds of
production which remains after proceeds allocable
to royalty and overriding royalty interests or
other lease burdens have been deducted.

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PART II

ITEM 5. MARKET FOR REGISTRANT'S COMMON EQUITY AND RELATED STOCKHOLDER MATTERS.

The Company's common stock, par value $0.01 per share is publicly traded on
the Nasdaq National Market and is quoted under the symbol "PTEN."

The following table sets forth the high and low sales prices of the
Company's common stock for the periods indicated:

<TABLE>
<CAPTION>
HIGH LOW
---- ---
<S> <C> <C>
1998:
First quarter............................................... $20.00 $ 8.88
Second quarter.............................................. 15.63 9.25
Third quarter............................................... 10.06 4.06
Fourth quarter.............................................. 7.00 3.44
1999:
First quarter............................................... $ 6.06 $ 2.75
Second quarter.............................................. 10.81 4.38
Third quarter............................................... 16.31 8.38
Fourth quarter.............................................. 15.94 10.00
</TABLE>

As of March 27, 2000, there were approximately 450 holders of record
(approximately 16,400 beneficial holders) of the Company's common stock.

The Company has not declared or paid cash dividends on its common stock in
the past and does not expect to declare or pay any cash dividends on its common
stock in the foreseeable future. The Company instead intends to retain its
earnings to support the operations and growth of its business. Any future cash
dividends would depend on future earnings, capital requirements, the Company's
financial condition and other factors deemed relevant by the Board of Directors.
In addition, the terms of an existing credit facility prohibit payment of
dividends by Patterson without the prior written consent of the noteholders.

During calendar 1999, Patterson issued a total of 825,776 shares of common
stock that were not registered under the Securities Act of 1933, as amended. The
shares were issued in two separate transactions as follows:

(a) During January 1999, Patterson issued a total of 800,000 of its
common stock valued at $5.00 per share as partial consideration for the
acquisition of five drilling rigs and related equipment from an unrelated
entity. See Items 1 and 2, "Business and Properties -- Recent Acquisition,"
for additional information; and

(b) The remaining 25,776 shares were issued by Patterson as
consideration for the acquisition of certain drilling equipment acquired
during June 1999 from an unrelated entity. The shares were valued at
$8.0625 per share, the market price of the shares on the date of the
transaction.

No underwriter was involved in either of the transactions and no sales
commissions, fees or similar compensation were paid to any person in connection
with the issuance of the shares. Patterson believes that the issuance of the
shares in each instance was exempt from the registration requirements of Section
5 of the Securities Act by virtue of Section 4(2) of the Securities Act and/or
under Rule 506 of Regulation D promulgated thereunder.

19
20

ITEM 6. SELECTED FINANCIAL DATA.

The selected consolidated financial data of the Company as of December 31,
1995, 1996, 1997, 1998 and 1999 and for each of the five years then ended should
be read in conjunction with "Management's Discussion and Analysis of Financial
Condition and Results of Operations" and the Consolidated Financial Statements
and related Notes thereto, included as Items 7 and 8, respectively, of this
Report.

<TABLE>
<CAPTION>
YEAR ENDED DECEMBER 31,
--------------------------------------------------
1995 1996 1997 1998 1999
---- ---- ---- ---- ----
(IN THOUSANDS, EXCEPT PER SHARE AMOUNTS)
(UNAUDITED)
<S> <C> <C> <C> <C> <C>
INCOME STATEMENT DATA:
Operating revenues:
Drilling................................ $57,599 $73,590 $178,332 $165,997 $131,287
Oil and natural gas..................... 6,845 10,118 12,445 7,170 8,563
Drilling fluids......................... -- -- -- 13,397 11,686
------- ------- -------- -------- --------
Total................................ 64,444 83,708 190,777 186,564 151,536
------- ------- -------- -------- --------
Operating costs and expenses:
Drilling................................ 46,505 59,564 128,416 128,838 113,569
Oil and natural gas..................... 2,669 3,465 4,402 3,676 2,500
Drilling fluids......................... -- -- -- 10,205 9,864
Impairment of oil and natural gas
properties........................... 159 549 355 3,816 275
Depreciation, depletion and
amortization......................... 7,523 9,960 17,497 28,091 28,156
General and administrative.............. 5,063 5,416 6,786 9,313 7,299
------- ------- -------- -------- --------
Total................................ 61,919 78,954 157,456 183,939 161,663
------- ------- -------- -------- --------
Operating income (loss)................... 2,525 4,754 33,321 2,625 (10,127)
------- ------- -------- -------- --------
Other income (expense).................... (111) (2,737) 1,787 (2,857) (3,341)
------- ------- -------- -------- --------
Income (loss) before income taxes......... 2,414 2,017 35,108 (232) (13,468)
Income tax expense (benefit).............. (787) (2,254) 12,866 93 (4,341)
------- ------- -------- -------- --------
Net income (loss)......................... $ 3,201 $ 4,271 $ 22,242 $ (325) $ (9,127)
======= ======= ======== ======== ========
Net income (loss) per common share:
Basic................................... $ 0.18 $ 0.22 $ 0.78 $ (0.01) $ ( 0.28)
======= ======= ======== ======== ========
Diluted................................. $ 0.18 $ 0.21 $ 0.75 $ (0.01) $ ( 0.28)
======= ======= ======== ======== ========
Weighted average number of common shares
outstanding:
Basic................................... 17,517 19,167 28,492 31,645 32,499
======= ======= ======== ======== ========
Diluted................................. 18,082 20,086 29,505 31,645 32,499
======= ======= ======== ======== ========
BALANCE SHEET DATA:
Total assets.............................. $62,991 $87,913 $203,200 $236,605 $236,257
Notes payable............................. 13,816 25,849 23,250 55,714 50,000
Stockholders' equity...................... 37,656 43,482 146,932 156,852 152,788
</TABLE>

ITEM 7. MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS
OF OPERATIONS.

This Item 7 contains forward-looking statements, which are made pursuant to
the "safe harbor" provisions of the Private Securities Litigation Reform Act of
1995. These statements include, without limitation, statements relating to
liquidity, financing of operations, continued volatility of oil and natural gas
prices, source and sufficiency of funds required for capital needs and
additional rig acquisitions (if further opportunities arise), future utilization
of net operating loss carryforwards, impact of inflation on the Company's
financial position and on the Company's earnings per share, and other such
matters. The words "believes," "budgeted," "expects" or "estimates" and similar
expressions identify forward-looking statements.
20
21

The Company does not undertake to update, revise or correct any of the
forward-looking information. Readers are cautioned that such forward-looking
statements should be read in conjunction with the Company's disclosures under
the heading: "Cautionary Statement for Purposes of the 'Safe Harbor' Provisions
of the Private Securities Litigation Reform Act of 1995" beginning on page 13.

LIQUIDITY AND CAPITAL RESOURCES

As of December 31, 1999, the Company had working capital of approximately
$27.0 million and cash and cash equivalents of approximately $8.8 million as
compared to working capital of approximately $30.5 million and cash and cash
equivalents of approximately $9.0 million as of December 31, 1998. For the year
ended December 31, 1999, the Company generated net cash from operations of
approximately $24.0 million, received proceeds of approximately $606,000 from
the exercise of stock options and sold property and equipment for proceeds of
approximately $1.2 million. These funds were used primarily to provide certain
necessary refurbishment of approximately $14.0 million to the Company's operable
drilling fleet, to fund leasehold acquisition, exploration and development of
approximately $5.1 million and to reduce net amounts owed under a then existing
term loan by approximately $5.7 million.

On January 27, 1999, the Company completed the acquisition of five drilling
rigs and other related equipment from a privately held, non-affiliated entity
based in Corpus Christi, Texas. The purchase price consisted of 800,000 shares
of the Company's stock at a guaranteed value of $5.00 per share. As part of the
acquisition agreement, the Company had the option exercisable on February 1,
2000 to buy back 300,000 of the 800,000 shares at $5.50 per share. The Company
exercised the option on February 1, 2000. The fair market value of the drilling
rigs and related equipment was estimated and the purchase price of $4.0 million,
representing the guaranteed value of the Company's common stock, was allocated
among such assets.

On October 28, 1999, the Company registered $150 million of various debt
and equity securities with the Securities and Exchange Commission on a Form S-3
Registration Statement. None of these securities were offered for sale under the
Form S-3 as of December 31, 1999 and there can be no assurance that the Company
could raise capital at acceptable terms using the registration statement.

On December 22, 1999, the Company entered into a credit agreement with
Transamerica Equipment Financial Services Corporation (the "Transamerica
Credit") providing for a non-revolving credit facility of $60.0 million. The
terms of the credit agreement included payments of interest only through January
1, 2001 at which time the outstanding principal amount will convert to a term
loan with a maturity date of January 1, 2006. The Company borrowed $50.0 million
under the credit facility and paid, prior to maturity, principal and interest
amounts outstanding, under its then existing term loan. As a result, the Company
expensed approximately $123,000 of deferred financing costs associated with the
term loan. This amount was included in interest expense at December 31, 1999, as
management does not consider the amount significant enough to warrant treatment
as an extraordinary item.

Management believes that the current level of cash and short-term
investments, together with cash generated from operations should be sufficient
to meet the Company's immediate capital needs. From time to time, the Company
reviews acquisition opportunities relating to its business. The timing, size or
success of any acquisition and the associated capital commitments are
unpredictable. Should further opportunities for growth requiring capital arise,
the Company believes it would be able to satisfy these needs through a
combination of working capital, cash from operations, and either debt or equity
financing. However, there can be no assurance that such capital would be
available.

21
22

RESULTS OF OPERATIONS

COMPARISON OF THE YEARS ENDED DECEMBER 31, 1999 AND 1998

For the year ended December 31, 1999, contract drilling revenues were
approximately $131.3 million as compared to $166.0 million for the same period
in 1998; a decrease of approximately 21%. Average rig utilization was 45% on an
average of 114 rigs available for service for the year ended December 31, 1999
as compared to 54% on an average of 106 rigs available for service for the
twelve months ended December 31, 1998. Direct drilling costs were $113.6 million
or 87% of drilling revenues for the year ended December 31, 1999; while direct
drilling costs were $128.8 million or 78% of related drilling revenues for 1998.
General and administrative expense for the contract drilling operations was
approximately $4.1 million for the year ended December 31, 1999 as compared to
approximately $6.1 million in 1998. The decrease in general and administrative
expense was largely attributable to the Company's decision to close its
administrative offices in Dallas, Abilene and Wichita Falls, Texas. The Dallas
office was acquired during February 1998 in the Company's acquisition of
Robertson Onshore Drilling Company and the Abilene office was acquired during
September 1997 in the Company's acquisition of Wes-Tex Drilling Company.
Additionally, the Company imposed a company-wide compensation reduction and
certain layoffs during January and February 1999 in an effort to reduce its
overhead costs in response to the significantly weakened economic conditions of
the industry. Depreciation and amortization expense for the contract drilling
segment increased from $22.4 million for the year ended December 31, 1998 to
approximately $24.4 million for the same twelve-month period in 1999. For the
twelve months ended December 31, 1999, operating loss from the Company's
contract drilling operations was approximately $10.3 million as compared to
income of approximately $9.3 million in 1998. The decline in the contract
drilling segment's operating results was reflective of reduced pricing in the
Company's contract services caused by significantly weakened commodity prices,
particularly for crude oil throughout fiscal year 1998 and the initial months of
1999, and the resulting 9% decrease in the Company's utilization rate.
Notwithstanding the recent improvement in oil and natural gas prices, there can
be no assurance that the demand for contract drilling services will increase
proportionally with the current higher commodity prices or of the duration of
the higher commodity prices.

Oil and natural gas sales revenues were approximately $6.8 million for the
year ended December 31, 1999, as compared to approximately $5.6 million in 1998.
The volume of oil and natural gas sold by the Company decreased by approximately
11% in 1999, as compared to fiscal year 1998. The average price per Bbl of crude
oil received by the Company was $18.08 in 1999, as compared to $12.16 in 1998,
and the average price per Mcf of natural gas was $2.22 in 1999, as compared to
$1.93 in 1998. Lease operating and production costs were $4.08 per BOE in both
1998 and 1999. General and administrative expense for the oil and natural gas
segment was approximately $1.2 million and $1.3 million for the years ended
December 31, 1999 and 1998, respectively. Exploration costs were approximately
$611,000 and $669,000 for the years ended December 31, 1999 and 1998,
respectively. Depreciation and depletion expense was approximately $2.7 million
in 1999, as compared to approximately $4.8 million in 1998. The decrease in
depreciation and depletion expense was reflective of the substantial increase in
the market price received for crude oil in December 31, 1999 versus December 31,
1998 which resulted in increases in reserve quantities and a related reduction
of the unit of production rates. Specifically, the market price was $11.16 per
barrel at December 31, 1998 and $24.90 per barrel at December 31, 1999, an
increase of approximately 123%. During 1998, primarily as a result of the
industry's significantly reduced commodity prices at December 31, 1998, the
Company impaired certain of its oil and natural gas properties by $3.8 million.
Comparatively, the Company incurred impairment expense of approximately $275,000
in 1999. Other revenues generated by the oil and natural gas segment, consisting
primarily of fees generated from lease operating activities, were approximately
$1.7 million and $1.5 million for the years ended December 31, 1999 and 1998,
respectively. For the year ended December 31, 1999, the oil and natural gas
segment generated income from operations of approximately $1.9 million as
compared to a loss of approximately $6.2 million for the year ended December 31,
1998. The fluctuation in the segment's operating results was primarily
attributable to the increase in the underlying commodity prices as discussed
above.

Operating revenues from the Company's drilling fluid services were
approximately $11.7 million and $13.4 million for the twelve months ended
December 31, 1999 and 1998, respectively. Operating costs

22
23

incurred by the drilling fluids segment were approximately $9.9 million in 1999
as compared to costs of approximately $10.2 million in 1998. For the twelve
months ended December 31, 1999, depreciation and amortization expense was $1.1
million as compared to approximately $895,000 in 1998. General and
administrative expense for the drilling fluids segment was approximately $2.0
million and $1.9 million for the twelve months ended December 31, 1999 and 1998,
respectively. This increase was partially due to the addition of the
administrative office in Corpus Christi, Texas acquired during September 1998
with the Company's purchase of Tejas Drilling Fluids, Inc. For the twelve months
ended December 31, 1999, the drilling fluids segment generated a net loss from
operations of approximately $1.4 million as compared to net operating income of
approximately $360,000 for the comparative twelve month period in 1998. The net
loss from operations was consistent with the decline in the segment's operating
revenues and expenses as discussed above and reflective of the deterioration in
the industry's economic conditions.

For the year ended December 31, 1999, the Company incurred interest expense
of approximately $4.1 million as compared to $4.5 million in 1998 and earned
interest income of approximately $445,000 and $767,000 in 1999 and 1998,
respectively. In 1999, the Company recognized a net gain on the sale of property
and equipment of $129,000 as compared to approximately $636,000 in 1998.

COMPARISON OF THE YEARS ENDED DECEMBER 31, 1998 AND 1997

For the year ended December 31, 1998, contract drilling revenues were
approximately $166.0 million as compared to $178.3 million for the same period
in 1997, a decrease of approximately 7%. Average rig utilization was 54% on an
average of 106 rigs available for service for the year ended December 31, 1998
as compared to 89% on an average of 73 rigs available for service during the
twelve months ended December 31, 1997. Direct drilling costs were $128.8 million
or 78% of drilling revenues for the year ended December 31, 1998, while direct
drilling costs were $128.4 million or 72% of related drilling revenues for 1997.
General and administrative expense for the contract drilling operations was
approximately $6.1 million for the year ended December 31, 1998 as compared to
approximately $5.4 million in 1997. The increase in general and administrative
expense was largely attributable to additional expense associated with the
administrative offices of Lone Star Mud Company and Robertson Onshore Drilling
Company acquired by the Company during January and February 1998, respectively.
The administrative responsibilities of the Robertson Onshore operations were
terminated during July 1998 and absorbed by the Company's personnel in Snyder,
Texas. Depreciation and amortization expense for the contract drilling segment
increased from $12.5 million for the year ended December 31, 1997 to
approximately $22.4 million for the same twelve-month period in 1998. The
increase in depreciation and amortization expense was largely attributable to
the increased number of drilling rigs added by acquisitions completed during
fiscal years 1997 and 1998. For the twelve months ended December 31, 1998,
operating income from the Company's contract drilling operations was
approximately $9.3 million as compared to approximately $32.7 million in 1997.
The decreased profitability was largely attributable to the 35% decrease in the
Company's rig utilization rates, a change in drilling contracts which required
the Company to bear certain costs associated with drilling wells that in 1997
was paid by the Company's customers, and, to a lesser extent, moderate decrease
during 1998 by the Company in its daily drilling rates. These three factors are
reflective of the detrimental impact the industry's weakened commodity prices
had on the Company's operations.

Oil and natural gas sales revenues were approximately $5.6 million for the
year ended December 31, 1998, as compared to approximately $10.8 million in
1997. The volume of oil and natural gas sold by the Company decreased by
approximately 29% in 1998, as compared to fiscal year 1997. The average price
per Bbl of crude oil received by the Company was $12.16 in 1998, as compared to
$17.86 in 1997, and the average price per Mcf of natural gas was $1.93 in 1998,
as compared to $2.19 in 1997. Lease operating and production costs were $4.08
per BOE in 1998, as compared to $3.41 per BOE in 1997. General and
administrative expense for the oil and natural gas segment was approximately
$1.3 million and $1.4 million for the years ended December 31, 1998 and 1997,
respectively. Exploration costs increased moderately by approximately 3% to
$669,000 for the year ended December 31, 1998. Depreciation and depletion
expense was approximately $4.8 million in 1998, as compared to approximately
$5.0 million in 1997. During 1998, primarily as a result of the industry's
significantly reduced commodity prices, the Company impaired certain of its oil
and natural gas

23
24

properties by $3.8 million. The Company incurred impairment expense of
approximately $355,000 in 1997. Other revenues generated by the oil and natural
gas segment, consisting primarily of fees generated from lease operating
activities, were approximately $1.5 million and $1.6 million for the years ended
December 31, 1998 and 1997, respectively. For the year ended December 31, 1998,
the oil and natural gas segment generated a loss from operations of
approximately $6.2 million as compared to income of approximately $2.4 million
for the year ended December 31, 1997. The decrease in the segment's operating
results was primarily attributable to the decrease in the underlying commodity
prices, particularly the 32% decrease in the price received for crude oil, as
discussed above.

Although the contract drilling and oil and natural gas segments represent
the Company's core operations, the Company derived operating revenues of
approximately $13.4 million from its drilling fluid services. For the year ended
December 31, 1998, the Company incurred approximately $13.0 million of operating
costs associated with its drilling fluid activities, including depreciation and
amortization expense of approximately $895,000 and general and administrative
expense of approximately $1.9 million. The Company generated approximately
$360,000 of operating income from its contract drilling fluid services for the
year ended December 31, 1998.

For the year ended December 31, 1998, the Company incurred interest expense
of approximately $4.5 million as compared to $1.0 million in 1997. This increase
was due to the additional $36.75 million borrowed during February 1998 in the
Company's acquisition of Robertson. In 1998, the Company recognized a net gain
on the sale of property and equipment of $636,000 as compared to approximately
$1.5 million in 1997. The decrease in 1998 was largely attributable to the sale
of the Company's interest in an oil and natural gas property of approximately
$813,000 during fiscal year 1997.

INCOME TAXES

At December 31, 1999, the Company had tax net operating loss ("NOL")
carryforwards of approximately $34.5 million. These NOL carryforwards expire at
various dates from 2004 through 2019, subject to certain limitations. Prior to
August 3, 1995, the Company realized substantial federal income tax savings due
to the NOL carryforwards. The utilization of these NOL carryforwards prior to
that date effectively reduced the current federal income tax rate. During 1995,
the Company's NOL carryforwards became subject to an annual limitation due to a
change of over 50% in the stock ownership of the Company as defined in Internal
Revenue Service Code Section 382(g). The NOL carryforwards that can be utilized
to offset net income in any year will be equal to approximately $3.3 million.
The NOL limitation is determined by the value of the Company's equity on August
2, 1995, the day prior to the ownership change, times 5.88%, the Federal long-
term exempt rate on that date as published by the U.S. Treasury Department, or
$1.8 million, and approximately $1.5 million which is determined by the value of
Tucker Drilling Company, Inc.'s equity on July 29, 1996, the day prior to
consummation of the Merger, times 5.78%, the Federal long-term exempt rate on
that date.

During the year ended December 31, 1996, the Company began recording
non-cash Federal deferred income taxes based primarily on the relationship
between the amount of the Company's unused Federal NOL carryforwards and the
temporary differences between the book basis and tax basis in the Company's
assets. Deferred tax assets and liabilities are measured using enacted tax rates
expected to apply to taxable income in the year in which those temporary
differences are expected to be recovered or settled. As a result of fully
recognizing the benefit of its deferred income taxes, the Company will incur
deferred income tax expense as these benefits are utilized. The Company incurred
a deferred income tax benefit of approximately $7.1 million for the year ended
December 31, 1999 and deferred income tax expense of approximately $6.5 million
for the year ended December 31, 1998.

24
25

VOLATILITY OF OIL AND NATURAL GAS PRICES

The Company's revenue, profitability and future rate of growth are
substantially dependent upon prevailing prices for oil and natural gas, both
with respect to its contract drilling and its oil and natural gas segments.
Historically, oil and natural gas prices and markets have been extremely
volatile. Prices are affected by market supply and demand factors as well as
actions of state and local agencies, the United States and foreign governments
and international cartels. All of these are beyond the control of the Company.
Any significant or extended decline in oil and/or natural gas prices will have a
material adverse effect on the Company's financial condition and results of
operations. Low level commodity prices beginning in the fourth quarter of 1997
and continuing into mid-1999 have adversely impacted the Company's operations.
Although there has been significant improvement in oil and natural gas prices
since mid-1999, Patterson expects oil and natural gas prices to continue to be
volatile and therefore to affect the financial condition and operations of
Patterson and its ability to access capital sources.

IMPACT OF INFLATION

The Company believes that inflation will not have a significant impact on
its financial position.

RECENTLY-ISSUED ACCOUNTING STANDARDS

The FASB issued Statement of Financial Accounting Standards No. 133,
"Accounting for Derivative Instruments and Hedging Activities," ("SFAS No. 133")
in June 1998. SFAS No. 133 establishes accounting and reporting standards for
derivative instruments, including certain derivative instruments embedded in
other contracts, and for hedging activities. This statement, as amended by SFAS
No. 137, is effective for all fiscal quarters of fiscal years beginning after
June 15, 2000. The provisions of SFAS No. 133 are not expected to have a
material impact on the Company's consolidated financial statements.

YEAR 2000 ISSUE

The year 2000 issue related to whether the Company's computer systems would
properly recognize date sensitive information due to the change in year to 2000,
or "00." Systems that fail to properly recognize such information could generate
erroneous data or cause a system to fail.

To date, the Company has not experienced any significant problems as a
result of the commencement of the year 2000. There remains a possibility that
residual consequences stemming from the change to the year 2000 could occur and,
if these consequences become widespread, they could have a material adverse
effect on the Company's business, financial condition, cash flows and results of
operations. However, the Company considers this possibility remote and does not
anticipate any significant problems due to the year 2000 issue.

ITEM 7a. QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

The Company has exposure to market risk associated with the floating rate
portion of the interest charged on the $50.0 million outstanding under its
credit facility with Transamerica Equipment Financial Services Corporation. The
credit facility, which matures on January 1, 2006, bears interest at LIBOR plus
3.51%. The Company's exposure to interest rate risk due to changes in LIBOR is
not expected to be material and at December 31, 1999, the fair value of the
obligation approximates its related carrying value because the obligation bears
interest at the current market rate.

ITEM 8. FINANCIAL STATEMENTS AND SUPPLEMENTARY DATA.

Financial Statements are filed as a part of this report at the end of Part
IV hereof beginning at page F-1, Index to Consolidated Financial Statements, and
are incorporated herein by this reference.

ITEM 9. CHANGES IN AND DISAGREEMENTS WITH ACCOUNTANTS ON ACCOUNTING AND
FINANCIAL DISCLOSURE.

None.
25
26

PART III

The information required by Part III is omitted from this report because
the Company will file a definitive Proxy Statement for the Company's 2000 Annual
Meeting of Stockholders (the "Proxy Statement") pursuant to Regulation 14A of
the Securities Exchange Act of 1934 not later than 120 days after the end of the
fiscal year covered by this Form 10-K and certain information included therein
is incorporated herein by reference.

ITEM 10. DIRECTORS AND EXECUTIVE OFFICERS OF THE REGISTRANT.

The information required by this Item is incorporated herein by reference
to the Proxy Statement.

ITEM 11. EXECUTIVE COMPENSATION.

The information required by this Item is incorporated herein by reference
to the Proxy Statement.

ITEM 12. SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS AND MANAGEMENT.

The information required by this Item is incorporated herein by reference
to the Proxy Statement.

ITEM 13. CERTAIN RELATIONSHIPS AND RELATED TRANSACTIONS.

The information required by this Item is incorporated herein by reference
to the Proxy Statement.

26
27

PART IV

ITEM 14. EXHIBITS, FINANCIAL STATEMENT SCHEDULES AND REPORTS ON FORM 8-K.

(a)(1) Financial Statements.

See Index to Consolidated Financial Statements on page F-1 of this report.

(a)(2) Financial Statement Schedules.

Financial Statement Schedules have been omitted because they are not
applicable or the information required therein is included elsewhere in the
financial statements or notes thereto.

(a)(3) Exhibits.

The following exhibits are filed herewith or incorporated by reference
herein.

<TABLE>
<C> <S>
2.1 Plan and Agreement of Merger dated October 14, 1993, between
Patterson Energy, Inc., a Texas corporation, and Patterson
Energy, Inc., a Delaware corporation, together with related
Certificates of Merger.(1)
2.2 Agreement and Plan of Merger, dated April 22, 1996 among
Patterson Energy, Inc., Patterson Drilling Company and
Tucker Drilling Company, Inc.(2)
2.2.1 Amendment to Agreement and Plan of Merger, dated May 16,
1996 among Patterson Energy, Inc., Patterson Drilling
Company and Tucker Drilling Company, Inc.(3)
2.3 Asset Purchase Agreement, dated June 4, 1997, among
Patterson Energy Inc., Patterson Drilling Company and
Wes-Tex Drilling Company.(3)
2.3.1 Amendment to Asset Purchase Agreement, dated June 4, 1997,
among Patterson Energy Inc., Patterson Drilling Company and
Wes-Tex Drilling Company.(5)
2.4 Agreement and Plan of Merger, dated January 20, 1998, among
Patterson Energy, Inc., Patterson Onshore Drilling Company
and Robertson Onshore Drilling Company.(7)
2.5 Stock Purchase Agreement, dated January 5, 1998, among
Patterson Energy, Inc., Spencer D. Armour, III. And Richard
G. Price.(19)
2.6 Stock Purchase Agreement, dated September 17, 1998, among
Lone Star Mud, Inc. and Mark Campbell (shareholder of Tejas
Drilling Fluids, Inc.).(4)
2.7 Asset Purchase Agreement, dated January 27, 1999, among
Patterson Energy, Inc., Patterson Drilling Company and Padre
Industries, Inc.(4)
3.1 Restated Certificate of Incorporation.(8)
3.1.1 Certificate of Amendment to the Certificate of
Incorporation.(9)
3.2 Bylaws.(1)
4.1 Excerpt from Restated Certificate of Incorporation of
Patterson Energy, Inc. regarding authorized Common Stock and
Preferred Stock.(10)
10.1 Loan and Security Agreement dated December 21, 1999 among
Patterson Drilling Company and Transamerica Equipment
Financial Services Corporation.
10.1.1 Promissory Note dated December 21, 1999 between Patterson
Drilling Company and Transamerica Equipment Financial
Services Corporation.
10.1.2 Corporate guarantees of Lone Star Mud, Inc. and Patterson
Energy, Inc.
10.2 Aircraft Lease, dated December 20, 1999, (effective January
1, 2000) between Talbott Aviation, Inc. and Patterson
Energy, Inc.
</TABLE>

27
28

<TABLE>
<S> <C>
10.3 Participation Agreement, dated October 19, 1994, between Patterson Petroleum Trading
Company, Inc. and BHT Marketing, Inc.(12)
10.3.1 Participation Agreement dated October 24, 1995, between Patterson Petroleum Trading
Company, Inc. and BHT Marketing, Inc.(13)
10.4 Crude Oil Purchase Contract, dated October 19, 1994, between Patterson Petroleum, Inc. and
BHT Marketing, Inc.(14)
10.4.1 Crude Oil Purchase Contract, dated October 24, 1995, between Patterson Petroleum, Inc. and
BHT Marketing, Inc.(13)
10.5 Patterson Energy, Inc. 1993 Stock Incentive Plan, as amended.(15)
10.6 Patterson Energy, Inc. Non-Employee Directors' Stock Option Plan, as amended.(16)
10.7 Model Form Operating Agreement.(17)
10.8 Form of Drilling Bid Proposal and Footage Drilling Contract.(17)
10.9 Form of Turnkey Drilling Agreement.(17)
21.1 Subsidiaries of the registrant.
23.1 Consent of Independent Accountants -- PricewaterhouseCoopers LLP.
23.2 Consent of Independent Petroleum Engineer -- M. Brian Wallace, P.E.
27.1 Financial Data Schedule as of December 31, 1999 and for the twelve months then ended.
</TABLE>

- ---------------

(1) Incorporated herein by reference to Item 27, "Exhibits" to Amendment No. 2
to Registration Statement on Form SB-2 (File No. 33-68058-FW); filed
October 28, 1993.

(2) Incorporated by reference to Item 7, "Financial Statements and Exhibits" to
Form 8-K dated April 22, 1996 and filed on April 30, 1996.

(3) Incorporated by reference to Item 7, "Financial Statements and Exhibits" to
Form 8-K dated May 16, 1996 and filed on May 22, 1996.

(4) Incorporated herein by reference to Item 14, "Exhibits, Financial Statement
Schedules and Reports on Form 8-K" to Form 10-K for the year ended December
31, 1998.

(5) Incorporated herein by reference to Item 7, "Financial Statements and
Exhibits", to Form 8-K dated September 3, 1997; filed September 11, 1997.

(6) Incorporated herein by reference to Item 7, "Financial Statements and
Exhibits" to Form 8-K dated November 14, 1997 and filed December 24, 1997.

(7) Incorporated herein by reference to Item 7, "Financial Statements and
Exhibits," to Form 8-K dated January 23, 1998; filed February 3, 1998.

(8) Incorporated herein by reference to Item 6, "Exhibits and Reports on Form
8-K" to Form 10-Q for the quarterly period ended September 30, 1996; filed
August 12, 1996.

(9) Incorporated herein by reference to Item 6. "Exhibits and Reports on Form
8-K" to Form 10-Q for the quarterly period ended June 30, 1997; filed
August 14, 1997.

(10) Incorporated herein by reference to Item 16, "Exhibits" to Registration
Statement on Form S-3 filed with the Securities Exchange Commission on
December 18, 1996.

(11) Incorporated herein by reference to Item 7, "Financial Statements and
Exhibits", to Form 8-K dated September 12, 1997; filed September 19, 1997.

(12) Incorporated herein by reference to Item 27, "Exhibits" to Post Effective
Amendment No. 1 to Registration Statement on Form SB-2 (File No.
33-68058-FW).

(13) Incorporated by reference to Item 7, "Financial Statements and Exhibits" to
Form 10-KSB for the year ended December 31, 1995.

28
29

(14) Incorporated by reference to Item 5, "Other Items" to Form 8-K dated
December 1, 1995 and filed on January 16, 1996.

(15) Incorporated herein by reference to Item 8, "Exhibits" to Registration
Statement on Form S-8 (File No. 333-47917); filed March 13, 1998.

(16) Incorporated herein by reference to Item 8, "Exhibits" to Registration
Statement on Form S-8 (File No. 33-39471); filed November 4, 1997.

(17) Incorporated by reference to Item 27, "Exhibits" to Registration Statement
filed with the Securities and Exchange Commission on August 30, 1993.

(18) Incorporated by reference to Item 14, "Exhibits, Financial Statement
Schedules and Reports on Form 8-K" to Form 10-K dated December 31, 1997.

(19) Incorporated herein by reference to Item 16, "Exhibits" to Registration
Statement on Form S-3 filed with the Securities Exchange Commission on
January 5, 1998.

(b) Reports on Form 8-K.

(1) Report dated November 3, 1999 announcing execution of a commitment letter
with Transamerica Equipment Financial Services Corporation to provide a $60
million credit facility; filed December 7, 1999.

(2) Report dated October 29, 1999 announcing the filing of a $150 million
Universal Shelf Registration Statement with the SEC; filed December 7, 1999.

(3) Report dated October 28, 1999 announcing the Company's results from
operations for the period ended September 30, 1999; filed December 28, 1999.

29
30

INDEX TO
CONSOLIDATED FINANCIAL STATEMENTS

<TABLE>
<CAPTION>
PAGE
----
<S> <C>
Report of Independent Accountants........................... F-2
Consolidated Financial Statements:
Consolidated Balance Sheets as of December 31, 1998 and
1999................................................... F-3
Consolidated Statements of Operations for the years ended
December 31, 1997, 1998 and 1999....................... F-4
Consolidated Statements of Stockholders' Equity for the
years ended December 31, 1997, 1998 and 1999........... F-5
Consolidated Statements of Cash Flows for the years ended
December 31, 1997, 1998 and 1999....................... F-6
Notes to Consolidated Financial Statements................ F-8
</TABLE>

F-1
31

REPORT OF INDEPENDENT ACCOUNTANTS

The Board of Directors and Stockholders of
Patterson Energy, Inc.

In our opinion, the accompanying consolidated balance sheets and the
related consolidated statements of operations, stockholders' equity and cash
flows present fairly, in all material respects, the financial position of
Patterson Energy, Inc. and Subsidiaries at December 31, 1998 and 1999 and the
results of their operations and their cash flows for each of the three years in
the period ended December 31, 1999, in conformity with accounting principles
generally accepted in the United States. These financial statements are the
responsibility of the Company's management; our responsibility is to express an
opinion on these financial statements based on our audits. We conducted our
audits of these statements in accordance with auditing standards generally
accepted in the United States, which require that we plan and perform the audit
to obtain reasonable assurance about whether the financial statements are free
of material misstatement. An audit includes examining, on a test basis, evidence
supporting the amounts and disclosures in the financial statements, assessing
the accounting principles used and significant estimates made by management, and
evaluating the overall financial statement presentation. We believe that our
audits provide a reasonable basis for the opinion expressed above.

PricewaterhouseCoopers LLP

Dallas, Texas
February 24, 2000

F-2
32

PATTERSON ENERGY, INC. AND SUBSIDIARIES

CONSOLIDATED BALANCE SHEETS

<TABLE>
<CAPTION>
DECEMBER 31,
--------------------------
1998 1999
---- ----
(IN THOUSANDS, EXCEPT FOR
SHARE DATA)
<S> <C> <C>
ASSETS

Current assets:
Cash and cash equivalents................................. $ 8,986 $ 8,792
Accounts receivable:
Trade, less allowance for doubtful accounts of $417,519
and $364,519 at December 31, 1998 and 1999,
respectively.......................................... 28,616 41,571
Oil and natural gas sales.............................. 426 803
Costs of uncompleted drilling contracts in excess of
related billings....................................... 100 87
Federal income taxes receivable........................... 8,400 --
Inventories............................................... 1,283 1,970
Deferred income taxes..................................... 1,568 964
Undeveloped oil and natural gas properties held for
resale................................................. 3,214 2,658
Other current assets...................................... 890 1,919
-------- --------
Total current assets.............................. 53,483 58,764
Property and equipment, at cost, net........................ 136,677 133,824
Intangible assets, net...................................... 45,875 41,818
Other assets................................................ 570 1,851
-------- --------
Total assets...................................... $236,605 $236,257
======== ========

LIABILITIES AND STOCKHOLDERS' EQUITY

Current liabilities:
Current maturities of note payable........................ $ 8,571 $ --
Accounts payable:
Trade.................................................. 9,748 23,676
Revenue distribution................................... 1,390 2,407
Other.................................................. 73 1,201
Accrued expenses.......................................... 3,170 4,432
-------- --------
Total current liabilities......................... 22,952 31,716
-------- --------
Deferred income taxes, net.................................. 9,566 1,688
Deferred liabilities........................................ 92 65
Note payable, less current maturities....................... 47,143 50,000
-------- --------
56,801 51,753
-------- --------
Commitments and contingencies............................... -- --
Stockholders' equity:
Preferred stock, par value $.01; authorized 1,000,000
shares, no shares issued............................... -- --
Common stock, par value $.01; authorized 50,000,000 shares
with 31,671,132 and 32,675,678 issued and outstanding
at December 31, 1998 and 1999, respectively............ 317 327
Additional paid-in capital................................ 112,544 117,597
Retained earnings......................................... 43,991 34,864
-------- --------
Total stockholders' equity........................ 156,852 152,788
-------- --------
Total liabilities and stockholders' equity........ $236,605 $236,257
======== ========
</TABLE>

The accompanying notes are an integral part of these consolidated financial
statements.
F-3
33

PATTERSON ENERGY, INC. AND SUBSIDIARIES

CONSOLIDATED STATEMENTS OF OPERATIONS

<TABLE>
<CAPTION>
YEARS ENDED DECEMBER 31,
---------------------------------------
1997 1998 1999
---- ---- ----
(IN THOUSANDS, EXCEPT PER SHARE DATA)
<S> <C> <C> <C>
Operating revenues:
Drilling.................................................. $178,332 $165,997 $131,287
Drilling fluids........................................... -- 13,397 11,686
Oil and natural gas sales................................. 10,773 5,641 6,834
Well operation fees....................................... 1,632 1,442 1,567
Other..................................................... 40 87 162
-------- -------- --------
190,777 186,564 151,536
-------- -------- --------
Operating costs and expenses:
Direct drilling costs..................................... 128,416 128,838 113,569
Drilling fluids........................................... -- 10,205 9,864
Lease operating and production............................ 2,274 1,924 1,720
Impairment of oil and natural gas properties.............. 355 3,816 275
Exploration costs......................................... 647 669 611
Dry holes and abandonments................................ 1,481 1,083 169
Depreciation, depletion and amortization.................. 17,497 28,091 28,156
General and administrative................................ 6,786 9,313 7,299
-------- -------- --------
157,456 183,939 161,663
-------- -------- --------
Operating income (loss)..................................... 33,321 2,625 (10,127)
-------- -------- --------
Other income (expense):
Net gain on sale of assets................................ 1,499 636 129
Interest income........................................... 1,056 767 445
Interest expense.......................................... (1,045) (4,471) (4,101)
Other..................................................... 277 211 186
-------- -------- --------
1,787 (2,857) (3,341)
-------- -------- --------
Income (loss) before income taxes........................... 35,108 (232) (13,468)
-------- -------- --------
Income tax expense (benefit):
Current................................................... 10,353 (6,358) 2,767
Deferred.................................................. 2,513 6,451 (7,108)
-------- -------- --------
12,866 93 (4,341)
-------- -------- --------
Net income (loss)........................................... $ 22,242 $ (325) $ (9,127)
======== ======== ========
Net income (loss) per common share:
Basic..................................................... $ 0.78 $ (0.01) $ (0.28)
======== ======== ========
Diluted................................................... $ 0.75 $ (0.01) $ (0.28)
======== ======== ========
Weighted average number of common shares outstanding:
Basic..................................................... 28,492 31,645 32,499
======== ======== ========
Diluted................................................... 29,505 31,645 32,499
======== ======== ========
</TABLE>

The accompanying notes are an integral part of these consolidated financial
statements.
F-4
34

PATTERSON ENERGY, INC. AND SUBSIDIARIES

CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY

<TABLE>
<CAPTION>
COMMON STOCK
------------------ ADDITIONAL
NUMBER PAID-IN RETAINED
OF SHARES AMOUNT CAPITAL EARNINGS TOTAL
--------- ------ ---------- -------- -----
(IN THOUSANDS)
<S> <C> <C> <C> <C> <C>
December 31, 1996........................... 19,774 $198 $ 21,210 $22,074 $ 43,482
Issuance of common stock.................. 9,384 94 68,221 -- 68,315
Issuance of stock purchase warrant........ -- -- 1,248 -- 1,248
Exercise of stock options................. 1,009 10 2,323 -- 2,333
Conversion of stock purchase warrant...... 800 8 6,392 -- 6,400
Tax benefit related to exercise of stock
options................................ -- -- 2,912 -- 2,912
Net income................................ -- -- -- 22,242 22,242
------ ---- -------- ------- --------
December 31, 1997........................... 30,967 310 102,306 44,316 146,932
Issuance of common stock.................. 571 5 9,941 -- 9,946
Exercise of stock options................. 133 2 297 -- 299
Net loss.................................. -- -- -- (325) (325)
------ ---- -------- ------- --------
December 31, 1998........................... 31,671 317 112,544 43,991 156,852
Issuance of common stock.................. 826 8 4,200 -- 4,208
Stock option compensation................. -- -- 250 -- 250
Exercise of stock options................. 179 2 603 -- 605
Net loss.................................. -- -- -- (9,127) (9,127)
------ ---- -------- ------- --------
December 31, 1999........................... 32,676 $327 $117,597 $34,864 $152,788
====== ==== ======== ======= ========
</TABLE>

The accompanying notes are an integral part of these consolidated financial
statements.
F-5
35

PATTERSON ENERGY, INC. AND SUBSIDIARIES

CONSOLIDATED STATEMENTS OF CASH FLOWS

<TABLE>
<CAPTION>
YEARS ENDED DECEMBER 31,
------------------------------
1997 1998 1999
---- ---- ----
(IN THOUSANDS)
<S> <C> <C> <C>
Cash flows from operating activities:
Net income (loss)......................................... $ 22,242 $ (325) $ (9,127)
Adjustments to reconcile net income (loss) to net cash
provided by operating activities:
Abandonment of oil and natural gas properties............. -- 694 169
Depreciation, depletion and amortization.................. 17,497 28,091 28,156
Impairment of oil and natural gas properties.............. 355 3,816 275
Net gain on sale of assets................................ (1,499) (636) (129)
Tax benefit related to exercise of stock options.......... 2,912 -- --
Deferred income tax expense (benefit)..................... 2,513 6,451 (7,108)
Compensation related to issuance of stock options......... -- -- 250
Decrease in deferred compensation liabilities............. (27) (595) (27)
Change in operating assets and liabilities:
(Increase) decrease in trade accounts receivable..... (20,989) 16,116 (12,955)
(Increase) decrease in cost of uncompleted drilling
contracts in excess of related billings........... -- (100) 13
(Increase) decrease in oil and natural gas sales
receivable........................................ 226 347 (377)
Increase in inventories.............................. -- (1,283) (687)
(Increase) decrease in Federal income taxes
receivable........................................ -- (8,400) 8,400
(Increase) decrease in undeveloped oil and natural
gas properties held for resale.................... (111) 873 556
(Increase) decrease in other current assets.......... 32 (375) (712)
Increase (decrease) in trade accounts payable........ (3) (2,378) 13,928
Increase (decrease) in revenue distribution
payable........................................... 920 (1,962) 1,017
Increase (decrease) in state and Federal income taxes
payable........................................... 6,752 (6,874) --
Increase (decrease) in accrued expenses.............. 3,018 (1,972) 1,262
Increase (decrease) in other current payables........ 604 (1,496) 1,128
-------- -------- --------
Net cash provided by operating activities......... 34,442 29,992 24,032
-------- -------- --------
Cash flows from investing activities:
Net sales (purchases) of investment securities............ (22) 566 --
Acquisitions.............................................. (49,400) (45,453) --
Purchases of property and equipment....................... (34,861) (34,148) (19,085)
Sales of property and equipment........................... 4,164 1,361 1,248
Change in other assets.................................... (13) 567 (1,281)
-------- -------- --------
Net cash used in investing activities............. (80,132) (77,107) (19,118)
-------- -------- --------
Cash flows from financing activities:
Proceeds from notes payable............................... 23,250 40,150 50,000
Payments on notes payable................................. (25,849) (7,686) (55,714)
Issuance of common stock and redeemable warrants.......... 59,400 -- --
Proceeds from exercise of stock options................... 8,733 299 606
-------- -------- --------
Net cash provided by (used in) financing
activities...................................... 65,534 32,763 (5,108)
-------- -------- --------
Net increase (decrease) in cash and cash
equivalents..................................... 19,844 (14,352) (194)
Cash and cash equivalents at beginning of year.............. 3,494 23,338 8,986
-------- -------- --------
Cash and cash equivalents at end of year.................... $ 23,338 $ 8,986 $ 8,792
======== ======== ========
</TABLE>

The accompanying notes are an integral part of these consolidated financial
statements.

(continued)
F-6
36
PATTERSON ENERGY, INC. AND SUBSIDIARIES

CONSOLIDATED STATEMENTS OF CASH FLOWS -- (CONTINUED)

<TABLE>
<CAPTION>
YEARS ENDED DECEMBER 31,
--------------------------
1997 1998 1999
---- ---- ----
(IN THOUSANDS)
<S> <C> <C> <C>
Supplemental disclosure of cash flow information:
Cash paid during the period for:
Interest............................................ $1,045 $4,471 $3,782
Income taxes........................................ 691 8,000 48
</TABLE>

Noncash investing and financing activities:

During 1999, the Company issued 825,776 shares of its common stock in two
separate unrelated transactions to acquire the drilling assets of Padre
Industries, Inc. for an aggregate purchase price of approximately $4.0 million
(see Notes 2 and 9) and other drilling equipment for approximately $208,000 (see
Note 9).

During 1998, the Company acquired Lone Star Mud, Inc., Robertson Onshore
Drilling Company and Tejas Drilling Fluids, Inc. for an aggregate purchase price
of approximately $58.8 million of which, approximately $45.5 million was paid in
cash as follows (see Note 2):

<TABLE>
<CAPTION>
(IN
THOUSANDS)
<S> <C>
Purchase price.............................................. $58,799
Less non-cash items:
Common stock issued....................................... (9,946)
Debt assumed.............................................. (3,400)
-------
Total cash paid................................... $45,453
=======
</TABLE>

During 1997, the Company completed five separate asset acquisitions for an
aggregate purchase price of approximately $59.6 million of which, approximately
$49.4 million was paid in cash as follows (see Note 2):

<TABLE>
<CAPTION>
(IN
THOUSANDS)
<S> <C>
Fair value of assets acquired............................... $59,563
Less non-cash items:
Common stock issued....................................... (8,915)
Three-year stock purchase warrant......................... (1,248)
-------
Total cash paid................................... $49,400
=======
</TABLE>

The accompanying notes are an integral part of these consolidated financial
statements.
F-7
37

PATTERSON ENERGY, INC. AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

1. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

A summary of the significant accounting policies follows:

Principles of consolidation -- The consolidated financial statements
include the accounts of Patterson Energy, Inc. ("Patterson") and its
wholly-owned subsidiaries, Patterson (GP) LLC, Patterson (LP) LLC, Patterson
Drilling Company LP, LLLP, Lone Star Mud LP, LLLP, Patterson Petroleum LP, LLLP
and Patterson Petroleum Trading Company LP, LLLP (collectively referred to
herein as the "Company"). All significant intercompany accounts and transactions
have been eliminated.

Description of business -- The Company engages in onshore contract drilling
of oil and natural gas, the development, exploration, acquisition and production
of oil and natural gas and provides contract drilling fluid services to the oil
and natural gas industry. The Company provides contract drilling services to
major oil and natural gas companies and independent producers in Texas, New
Mexico, Oklahoma, Louisiana and Utah.

The contract drilling business experienced increased demand for drilling
services from 1995 through the third quarter of 1997 due to stronger crude oil
and natural gas prices. However, except for that period and other occasional
upturns, the market for onshore contract drilling and other related services has
generally been depressed since mid-1982, when crude oil and natural gas prices
began to weaken. A particularly sharp decline in demand for these services
occurred in 1986 because of the worldwide collapse in crude oil prices. Since
this time and except during the occasional upturns, there have been
substantially more drilling rigs available than necessary to meet demand in most
operating and geographic segments of the domestic drilling industry. In addition
to adverse effects that future declines in demand could have on the Company,
ongoing movement or reactivation of onshore drilling rigs or new construction of
drilling rigs could adversely affect rig utilization rates and pricing, even in
an environment of stronger oil and natural gas prices and increased drilling
activity. The Company cannot predict either the future level of demand for its
contract drilling and other related services or future conditions in the oil and
natural gas industry. The Company's rig utilization rate reached an all time
high of approximately 91.5% in the third quarter of 1997, but has weakened since
then due to the significant reduction in the price of crude oil during 1998 and
the first half of 1999. Although there has been significant improvement in oil
and natural gas prices since mid-1999, the Company expects such commodity prices
to continue to be volatile and therefore to affect the financial condition and
operations of the Company and its ability to access capital.

Management estimates -- The preparation of financial statements in
conformity with generally accepted accounting principles requires management to
make estimates and assumptions that affect the reported amounts of assets and
liabilities and disclosure of contingent assets and liabilities at the date of
the financial statements and the reported amounts of revenues and expenses
during the reporting period. Actual results could differ from those estimates.

Drilling operations -- The Company follows the percentage-of-completion
method of accounting for footage and day work drilling arrangements. Under this
method all drilling revenues, direct costs and appropriate portions of indirect
costs, related to the contracts in progress, are recognized as contract drilling
services are performed.

The Company follows the completed contract method of accounting for turnkey
drilling arrangements. Under this method, all drilling advances, direct costs
and appropriate portions of indirect costs (including maintenance, repairs and
depreciation) related to the contracts in progress are deferred and recognized
as revenues and expenses in the period the contracts are completed.

Provisions for losses are made on incomplete contracts when losses become
known or are anticipated.

Inventories -- Inventories consist primarily of chemical products to be
used in conjunction with the Company's contract drilling fluid activities. The
inventories are stated at the lower of cost or market. Cost is determined by the
first-in, first-out method.
F-8
38
PATTERSON ENERGY, INC. AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)

1. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES -- (CONTINUED)
Undeveloped oil and natural gas properties held for resale -- Undeveloped
oil and natural gas properties held for resale represent leasehold interests in
unproven oil and natural gas properties which the Company expects to sell. Also
included are leasehold costs programmed for development under arrangements which
will provide for reimbursement of such costs to the Company. Such properties are
carried at the lower of cost or net realizable value. The Company recognizes
gains or losses upon disposition or impairment of the properties.

Property and equipment -- Property and equipment (other than oil and
natural gas) -- Depreciation is provided on the straight-line method over the
estimated useful lives as defined below. The Company incurred depreciation
expense of approximately $11.7 million, $20.2 million and $22.0 million for the
years ended December 31, 1997, 1998 and 1999, respectively.

<TABLE>
<CAPTION>
LIVES (YEARS)
-------------
<S> <C>
Drilling rigs and related equipment......................... 2-15
Office furniture............................................ 3-10
Buildings................................................... 5-20
Automotive equipment........................................ 2-7
Other....................................................... 3-7
</TABLE>

Oil and natural gas properties -- The Company follows the successful
efforts method of accounting, using the field as its accumulation center for
capitalized costs. Under the successful efforts method of accounting, costs
which result directly in the discovery of oil and natural gas reserves and all
development costs are capitalized. Exploration costs which do not result
directly in discovering oil and natural gas reserves are charged to expense as
incurred. The capitalized costs, consisting of lease and well equipment, lease
acquisition costs and intangible development costs are depreciated, depleted and
amortized on the units-of-production method, based on petroleum engineer
estimates of recoverable proved developed oil and natural gas reserves of each
respective field. The Company incurred depletion expense of approximately $4.8
million, $4.6 million and $2.7 million for the years ended December 31, 1997,
1998 and 1999, respectively.

Impairment of long-lived assets -- In accordance with Statement of
Financial Accounting Standards No. 121, "Accounting for the Impairment of
Long-Lived Assets and for Long-Lived Assets to be Disposed Of," net capitalized
costs of long-lived assets, certain identifiable intangibles and goodwill in
excess of estimated future net revenues are reduced to reflect an amount which
is expected to be recovered through the future cash flows generated by the use
of the related assets. Impairment of oil and natural gas properties is
periodically assessed on a field basis as determined by an independent reserve
engineer. The Company incurred approximately $355,000, $3.8 million and $275,000
of impairment to such properties for the years ended December 31, 1997, 1998 and
1999, respectively. Impairment to the Company's oil and natural gas properties
was primarily attributable to a significant decline in the market price of crude
oil and/or revisions to existing reserve estimates.

Maintenance and repairs -- Maintenance and repairs are charged against
operations. Renewals and betterments which extend the life or improve existing
properties are capitalized.

Retirements -- Upon disposition or retirement of property and equipment
(other than oil and natural gas properties), the cost and related accumulated
depreciation are removed and the gain or loss thereon, if any, is credited or
charged to operations. The Company recognizes the gain or loss on the sale of
either a part of a proved oil and natural gas property or an entire proved oil
and natural gas property constituting a part of a field upon the sale or
disposition of such. The unamortized cost of the property or group of
properties, a part of which was sold or otherwise disposed of, is apportioned to
the interest sold and the interest retained on the basis of the fair value of
those interests.

F-9
39
PATTERSON ENERGY, INC. AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)

1. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES -- (CONTINUED)
Intangible assets -- Intangible assets consist primarily of goodwill and
covenants not to compete arising from business combinations (see Notes 2 and 5).
The values assigned to intangible assets, based in part upon independent
appraisals, are amortized on a straight line basis. Goodwill, representing the
excess of the purchase price over the estimated fair value of the net assets of
the acquired business, is amortized over the period of expected benefit of 15
years. Covenants not to compete are amortized over their contractual lives.
Amortization expense charged to operations for the years ended December 31,
1997, 1998 and 1999 was approximately $942,452, $3.3 million and $3.6 million,
respectively.

Earnings per share -- The Company provides a dual presentation of its
earnings per share; Basic Earnings per Share ("Basic EPS") and Diluted Earnings
per Share ("Diluted EPS") in its Consolidated Statements of Operations. Basic
EPS is based on the weighted average number of shares outstanding during the
year. Diluted EPS includes common stock equivalents, which are dilutive to
earnings per share. For the year ended December 31, 1997, the dilutive
securities, consisting of certain stock options and warrants as described in
Note 10, were approximately 1.0 million. Dilutive securities of approximately
1.5 million and 2.4 million were excluded from the December 31, 1998 and 1999
calculations of Diluted EPS as a result of the Company's net loss for each of
the years.

Stock splits -- On July 25, 1997 and January 23, 1998, the Company effected
two-for-one splits of its common stock. All information regarding earnings per
share, weighted average number of common shares outstanding, stock options and
warrants issued and exercised and all other related disclosures herein reflect
the effects of such stock splits for all periods presented (see Note 9).

Income taxes -- Income taxes are based on earnings reported for financial
statement purposes. The provision for income taxes differs from the amounts
currently payable because of permanent and temporary differences in the
recognition of certain income and expense items for financial reporting and tax
reporting purposes.

Deferred tax assets and liabilities are determined based on the temporary
differences between the financial statement and tax basis of assets and
liabilities using enacted statutory rates in effect for the year in which the
differences are expected to reverse. Deferred tax assets primarily result from
net operating loss carryforwards, certain accrued but unpaid insurance losses,
alternative minimum tax credit carryforwards and investment tax credit
carryforwards. Deferred tax liabilities primarily result from differences
between the financial statement and tax basis of the Company's fixed assets.
Investment tax credits are recorded under the flow through method as a reduction
of the provision for income taxes.

Stock based compensation -- The Company grants stock options to employees
and non-employee directors under stock-based incentive compensation plans, (the
"Plans"). The Company applies Accounting Principles Board ("APB") Opinion 25 and
related Interpretations in accounting for the Plans. In 1995, the Financial
Accounting Standards Board ("FASB") issued Statement of Financial Accounting
Standards No. 123 "Accounting for Stock-Based Compensation" ("SFAS No. 123")
which, if fully adopted by the Company, would change the methods the Company
applies in recognizing the cost of the Plans. Adoption of the cost recognition
provisions of SFAS No. 123 is optional and the Company decided not to elect
these provisions. However, pro forma disclosures as if the Company adopted the
cost recognition provisions of SFAS No. 123 in 1995 are required by SFAS No. 123
and are presented in Note 10.

Statement of cash flows -- For purposes of reporting cash flows, cash and
cash equivalents include cash on hand, cash on deposit and unrestricted
certificates of deposit with original maturities of 90 days or less.

Recently Issued Accounting Standards -- The FASB issued Statement of
Financial Accounting Standards No. 133, "Accounting for Derivative Instruments
and Hedging Activities," ("SFAS No. 133") in June 1998. SFAS No. 133 establishes
accounting and reporting standards for derivative instruments, including

F-10
40
PATTERSON ENERGY, INC. AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)

1. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES -- (CONTINUED)
certain derivative instruments embedded in other contracts, and for hedging
activities. This statement, as amended by SFAS No. 137, is effective for all
fiscal quarters of fiscal years beginning after June 15, 2000. The provisions of
SFAS No. 133 are not expected to have a material impact on the Company's
consolidated financial statements.

Reclassifications -- Certain reclassifications have been made to the 1997
and 1998 consolidated financial statements in order for them to conform with the
1999 presentation. The reclassifications had no effect on net income (loss) or
stockholders' equity for these years.

2. MERGER AND ACQUISITIONS

1999 ACQUISITION

Padre Industries, Inc. -- On January 27, 1999, the Company completed the
acquisition of five drilling rigs and other related equipment from a privately
held, non-affiliated entity based in Corpus Christi, Texas. The purchase price
consisted of 800,000 shares of the Company's stock at a guaranteed value of
$5.00 per share. As part of the acquisition agreement, the Company had the
option exercisable on February 1, 2000 to buy back 300,000 of the 800,000 shares
at $5.50 per share. The Company exercised the option on February 1, 2000. The
fair market value of the drilling rigs and related equipment was estimated and
the purchase price of $4.0 million, representing the guaranteed value of the
Company's common stock, was allocated among such assets.

1998 MERGER AND ACQUISITIONS

Lone Star Mud, Inc. -- On January 5, 1998, the Company acquired 100% of the
outstanding stock of Lone Star Mud, Inc. ("Lone Star"), a privately-owned,
non-affiliated company based in Midland, Texas. The purchase price of
approximately $13.0 million consisted of $1.4 million in cash, 571,328 shares of
the Company's common stock valued at $17.41 per share, the assumption of $1.6
million of debt and approximately $3,300 of other direct costs incurred relative
to the transaction. Pursuant to certain terms of the Company's existing loan
agreement with Norwest Bank Texas, N.A. ("Norwest"), the outstanding balance of
the above mentioned debt was paid in full. The fair market values of the assets
acquired were estimated and the purchase price, as of the date of the
acquisition, was allocated as follows (in thousands):

<TABLE>
<S> <C>
Net assets acquired......................................... $ 3,069
Goodwill.................................................... 9,911
-------
Total purchase price................................... $12,980
=======
</TABLE>

Robertson Onshore Drilling Company -- On February 6, 1998, the Company
completed the merger of Robertson Onshore Drilling Company ("Robertson") a
privately-owned, non-affiliated, contract drilling company based in Dallas,
Texas, with and into Patterson Onshore Drilling Company, a wholly-owned
subsidiary of Patterson Drilling Company. The purchase price of approximately
$42.2 million was funded using cash on hand of approximately $3.25 million,
proceeds of $36.75 million provided by the Company's line of credit, the
assumption of $1.8 million of debt and approximately $444,000 of direct costs
incurred related to the acquisition. The assets acquired consisted of 15
operable drilling rigs and a shop and yard located in Liberty City, Texas. The
purchase price, as of the date of the acquisition, was allocated based on
estimated fair values as follows (in thousands):

<TABLE>
<S> <C>
Net assets acquired......................................... $31,565
Goodwill.................................................... 10,680
-------
Total purchase price................................... $42,245
=======
</TABLE>

F-11
41
PATTERSON ENERGY, INC. AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)

2. MERGER AND ACQUISITIONS -- (CONTINUED)
Tejas Drilling Fluids, Inc. -- On September 17, 1998, the Company acquired
100% of the outstanding stock of Tejas Drilling Fluids, Inc. ("Tejas"), a
privately-owned, non-affiliated company based in Corpus Christi, Texas for $3.5
million cash and approximately $74,000 of other direct costs incurred relative
to the transaction. The fair market values of the assets acquired were estimated
and the purchase price, as of the date of acquisition, was allocated as follows
(in thousands):

<TABLE>
<S> <C>
Net assets acquired......................................... $ 263
Goodwill.................................................... 2,061
Covenants not to compete.................................... 1,250
------
Total purchase price................................... $3,574
======
</TABLE>

1997 MERGER AND ACQUISITIONS

Wes-Tex Drilling Company -- On June 12, 1997, the Company consummated an
acquisition to purchase 21 contract drilling rigs, related rolling stock, a shop
and a yard from Wes-Tex Drilling Company ("Wes-Tex"), a privately-owned,
non-affiliated contract drilling company based in Abilene, Texas. The purchase
price of approximately $35.4 million consisted of $25.0 million in cash, 1.132
million shares of Patterson's common stock valued at $7.875 per share, a
three-year stock purchase warrant (valued at $1.56 per share) to purchase
800,000 additional shares of Patterson common stock at an exercise price of
$8.00 per share and approximately $190,000 of other direct costs incurred
relative to the transaction. The acquisition was funded using $19.0 million of
cash on hand and $6.0 million provided by the Company's credit facility
maintained with Norwest Bank Texas, N.A. (the "Norwest Line") (see Note 7). The
purchase price, as of the date of acquisition, was allocated based on estimated
fair values as follows (in thousands):

<TABLE>
<S> <C>
Contract drilling assets.................................... $17,450
Goodwill.................................................... 16,629
Covenants not to compete.................................... 1,273
-------
Total purchase price................................... $35,352
=======
</TABLE>

The pro forma results have been prepared for comparative purposes only and
do not purport to be indicative of what would have occurred had the acquisition
been made as of the date indicated. In addition, they are not intended to be a
projection of future results and do not reflect any synergies that might be
achieved from combined operations.

Other 1997 asset acquisitions -- During 1997, in four separate transactions
with non-affiliated entities, the Company acquired 17 contract drilling rigs,
other related drilling equipment and rolling stock, five yards, two shops and an
office. Total consideration paid for these assets was $24.2 million, of which
$7.0 million was funded using cash on hand and $17.3 million was provided by the
Norwest Line. The related purchase prices as of the respective dates of
acquisition were allocated based on estimated fair values as follows (in
thousands):

<TABLE>
<S> <C>
Contract drilling assets.................................... $16,541
Goodwill.................................................... 7,269
Covenants not to compete.................................... 401
-------
Total purchase price................................... $24,211
=======
</TABLE>

The aforementioned acquisitions completed during fiscal years 1997, 1998
and 1999 have been accounted for as purchases and the related results of
operations and cash flows of the acquired entities have been included in the
consolidated financial statements since their respective dates of acquisition.

F-12
42
PATTERSON ENERGY, INC. AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)

3. CASH

Included in cash as of December 31, 1998 and 1999 was approximately $1.4
million and $2.4 million, respectively, of monthly oil and natural gas sales to
be distributed to revenue owners subsequent to year-end.

4. PROPERTY AND EQUIPMENT

Property and equipment consisted of the following at December 31, 1998 and
1999 (in thousands):

<TABLE>
<CAPTION>
1998 1999
---- ----
<S> <C> <C>
Drilling rigs and related equipment.................... $199,331 $ 215,312
Producing oil and natural gas properties............... 27,856 32,962
Other equipment........................................ 2,135 2,143
Buildings.............................................. 3,953 4,226
Land................................................... 1,534 1,492
-------- ---------
234,809 256,135
Less accumulated depreciation and depletion............ (98,132) (122,311)
-------- ---------
$136,677 $ 133,824
======== =========
</TABLE>

5. INTANGIBLE ASSETS

Intangible assets consisted of the following at December 31, 1998 and 1999
(in thousands):

<TABLE>
<CAPTION>
1998 1999
---- ----
<S> <C> <C>
Goodwill.................................................. $46,482 $46,983
Covenants not to compete.................................. 2,673 1,673
Other..................................................... 979 979
------- -------
50,134 49,635
Less accumulated amortization............................. (4,259) (7,817)
------- -------
$45,875 $41,818
======= =======
</TABLE>

6. ACCRUED EXPENSES

Accrued expenses consisted of the following at December 31, 1998 and 1999
(in thousands):

<TABLE>
<CAPTION>
1998 1999
---- ----
<S> <C> <C>
Salaries, wages and related payroll taxes................... $1,276 $2,318
Workers' compensation liability............................. 1,157 1,370
Sales taxes................................................. 472 359
Other....................................................... 265 385
------ ------
$3,170 $4,432
====== ======
</TABLE>

F-13
43
PATTERSON ENERGY, INC. AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)

7. NOTES PAYABLE

Notes payable consisted of the following at December 31, 1998 and 1999 (in
thousands):

<TABLE>
<CAPTION>
1998 1999
---- ----
<S> <C> <C>
Line of credit agreement with Norwest Bank Texas, N.A.
providing for an advancing, non-revolving credit facility
of $70.0 million, monthly payments of interest only at the
London Interbank Offered Rate (LIBOR) plus 2.375% (7.921%
at December 31, 1998) through May 1998 at which time the
outstanding principal balance converted to a term loan
with a maturity date of January 1, 2001 and a seven-year
level principal amortization. The obligation was
collateralized by certain accounts receivable, drilling
rigs and other related drilling equipment................. $55,714 $ --

Line of credit agreement with Transamerica Equipment
Financial Services Corporation providing for an advancing,
non-revolving credit facility of $60.0 million, monthly
payments of interest only at LIBOR plus 3.51% (9.51% at
December 31, 1999) through January 1, 2001 at which time
the outstanding principal balance converts to a term loan
with a maturity of January 1, 2006. The obligation is
collateralized by drilling rigs and other related
equipment................................................. -- 50,000

Less current maturities................................... (8,571) --
------- -------
$47,143 $50,000
======= =======
</TABLE>

During December 1997, the Company entered into a line of credit agreement
("the Norwest Line") with Norwest Bank Texas, N.A. ("Norwest") which amended and
restated its existing agreement that was entered into in June 1997. As amended,
the Norwest Line provided for an advancing, non-revolving credit facility of
$70.0 million. The Norwest Line was payable interest only at LIBOR plus 2.375%
through May 31, 1998, at which time the outstanding principal balance of $60.0
million converted to a term loan with a January 1, 2001 maturity date and a
seven year level principal amortization. During 1997 and 1998, the Company
borrowed $23.25 million and $36.75 million, respectively, under the Norwest Line
to fund acquisitions (see Note 2).

On December 22, 1999, the Company entered into a credit agreement with
Transamerica Equipment Financial Services Corporation (the "Transamerica
Credit") providing for a non-revolving credit facility of $60.0 million. The
terms of the credit agreement include payments of interest only through January
1, 2001 at which time the outstanding principal amount will convert to a term
loan with a maturity date of January 1, 2006. The Company borrowed $50.0 million
under the credit facility and paid, prior to maturity, principal and interest
amounts outstanding, under the existing Norwest Line. As a result, the Company
expensed approximately $123,000 of deferred financing costs associated with the
Norwest Line. This amount was included in interest expense at December 31, 1999,
as management does not consider the amount significant enough to warrant
treatment as an extraordinary item.

Five-year maturities of note payable -- Scheduled maturities of the
Transamerica Credit for the periods subsequent to December 31, 1999, are as
follows (in thousands):

<TABLE>
<S> <C>
2000........................................................ $ --
2001........................................................ 9,167
2002........................................................ 10,000
2003........................................................ 10,000
2004........................................................ 10,000
Thereafter.................................................. 10,833
-------
Total............................................. $50,000
=======
</TABLE>

F-14
44
PATTERSON ENERGY, INC. AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)

7. NOTES PAYABLE -- (CONTINUED)
The Transamerica Credit contains a number of representations, warranties
and covenants, the breach of which, at the election of Transamerica, would
accelerate the maturity date of the outstanding principal balance.

The more restrictive covenants include:

- Maintenance on a quarterly basis of a ratio of consolidated cash flow
to the sum of all principal and interest payments and unfinanced
capital expenditure costs during the measurement period of at least
1.2 to 1.0;

- Maintenance on an annual basis of a ratio of total liabilities to
tangible net worth not to exceed 3.0 to 1.0;

- Maintenance on an annual basis of a minimum tangible net worth of
$80.0 million;

- Without written consent of Transamerica, the Company cannot conduct
any business not currently being conducted by the Company, nor
liquidate, dissolve or merge into any other entity; and

- The Company shall not pay, or authorize the payment of, any dividends
on any stock, debenture or other security without the prior written
consent of Transamerica.

The estimated fair value of the Company's long-term debt obligations
approximates its related carrying value because the underlying debt agreement
bears interest at current market rates.

A commercial bank has issued a letter of credit to the Company's workers'
compensation insurance carrier on behalf of the Company in the amount of
$150,000 which is fully collateralized by a certificate of deposit.
Additionally, the Company maintains letters of credit in the aggregate amount of
$230,289 with a bank for the benefit of an insurance company as collateral for
retrospective premiums and retained losses which could become payable under the
terms of the Company's insurance contract. These letters of credit expire in
November 2000, but provide for an indefinite number of annual extensions of the
expiration date and are fully collateralized by the Company's cash. No amounts
have been drawn under the letters of credit.

8. COMMITMENTS AND CONTINGENCIES

Contingencies -- The Company's contract services and oil and natural gas
exploration and production operations are subject to inherent risks, including
blowouts, cratering, fire and explosions which could result in personal injury
or death, suspended drilling operations, damage to, or destruction of equipment,
damage to producing formations and pollution or other environmental hazards.

As a protection against these hazards, the Company maintains general
liability insurance coverage of $2.0 million per occurrence with $2.0 million of
aggregate coverage and excess liability and umbrella coverages up to $40.0
million per occurrence with a $40.0 million aggregate.

The Company believes it is adequately insured for public liability and
property damage to others with respect to its operations. However, such
insurance may not be sufficient to protect the Company against liability for all
consequences of well disasters, extensive fire damage or damage to the
environment. The Company also carries insurance to cover physical damage to, or
loss of, its rigs; however, it does not carry insurance against loss of earnings
resulting from such damage or loss. The Company's lender who has a security
interest in the drilling rigs is named as loss payee on the physical damage
insurance on such rigs.

The Company is involved in various routine litigation incident to its
business. In the Company's opinion, none of these proceedings will have a
material adverse effect on the financial condition of the Company.

F-15
45
PATTERSON ENERGY, INC. AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)

9. STOCKHOLDERS' EQUITY

During June 1999, the Company issued 25,776 shares of its common stock as
consideration for certain drilling equipment acquired from an unrelated entity.
The common stock was recorded at $8.0625 per share, its fair market value on the
date of purchase.

On January 27, 1999, the Company issued 800,000 shares of its common stock
as consideration for the Company's acquisition of the drilling assets of Padre
Industries, Inc. The common stock was recorded at its guaranteed value of $5.00
per share, or an aggregate purchase price of $4.0 million. On February 1, 2000,
the Company exercised its option to buy back 300,000 shares of its common stock
previously issued in conjunction with this acquisition for $5.50 per share (see
Note 2).

During January 1998, the Company acquired the outstanding stock of Lone
Star. The purchase price consisted of $1.4 million in cash, 571,328 shares of
the Company's common stock valued at $17.41 per share, the assumption of $1.6
million of debt and approximately $3,300 of other direct costs (see Note 2).

On July 1, 1997, the stockholders of Patterson approved an amendment to
Patterson's Certificate of Incorporation increasing the number of authorized
shares of common stock from 9 million shares to 18 million shares. During
December 1997, the stockholders of Patterson approved a second amendment to
Patterson's Certificate of Incorporation further increasing the number of
authorized shares of common stock to 50 million shares.

During July and December 1997, the Company's Board of Directors authorized
two-for-one stock splits in the form of 100% stock dividends payable on July 25,
1997 and January 23, 1998, respectively. Par value of the Company's common stock
remained at $0.01 per share. Earnings per share and weighted average number of
common shares outstanding have been restated for all periods presented to
reflect the stock splits. As such, the Consolidated Statements of Stockholders'
Equity and pertinent footnote disclosures contained herein have been restated to
retroactively apply the effects of the stock splits.

During June 1997, the Company issued 1.1 million shares of common stock
valued at $7.875 per share as partial consideration for its acquisition of 21
contract drilling rigs and other related drilling equipment (see Note 2).

During January 1997, the Company completed a public offering of 7.1 million
shares of common stock at a price of $7.6875 per share. During February 1997,
the underwriters of the Company's public offering exercised their overallotment
option to purchase 1.2 million additional shares of common stock. Net proceeds
from the offering totaled approximately $59.4 million to the Company.

10. STOCK OPTIONS AND WARRANTS

Employee Stock Incentive Plans -- In August 1993, the Company adopted the
Patterson Energy, Inc. 1993 Stock Incentive Plan (the "Stock Incentive Plan").
The purpose of the Stock Incentive Plan is to provide continuing incentives to
the Company's key employees, which may include, but shall not necessarily be
limited to, members of the Board of Directors (excluding members of the
Compensation Committee) and officers of the Company. The Stock Incentive Plan
provides for an authorization of 2.8 million shares of common stock for issuance
thereunder. Under the Stock Incentive Plan, the Company may grant to key
employees awards of stock options and restricted stock or any combination
thereof. The Company may grant both incentive stock options ("incentive stock
options") intended to qualify under Section 422 of the Internal Revenue Code of
1986, as amended, and options which are not qualified as incentive stock
options. The options become immediately exercisable in the event of a change in
control (as defined in the Stock Incentive Plan) of the Company.

F-16
46
PATTERSON ENERGY, INC. AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)

10. STOCK OPTIONS AND WARRANTS -- (CONTINUED)
Under the Stock Incentive Plan, the exercise price of incentive stock
options must be at least equal to the fair market value of the stock on date of
grant and the exercise price of non-incentive stock options may not be less than
80% of the fair market value on date of grant.

Stock options covering a total of 2.8 million shares of common stock (net
of any forfeitures and expirations as defined below) have been granted to date
under the Stock Incentive Plan to three executive officers and various other
employees of the Company. The outstanding options were variously granted since
1995. Each of the options has a 10-year term and the exercise prices were equal
to the fair market value of the Company's common stock on the respective grant
dates. The options granted to the employees vest either (i) 20% a year,
beginning on the grant date and 20% for the next four anniversaries of the date
of grant, (ii) 11.2% a year for the first five years, beginning on the grant
date, and 22% on each of the next two anniversaries of the grant date, or (iii)
0.0% for the first year, approximately 4% for each of the next two anniversaries
and 25% on each of the next four anniversaries of the date of grant. A total of
525,290 options granted under the Stock Incentive Plan have been exercised,
113,800 have been forfeited and 17,200 have expired as of December 31, 1999.

In March 1983, the Board of Directors of Tucker approved and implemented an
Incentive Stock Option Plan which was amended in 1988 to allow for the granting
of nonqualified stock options and in 1991 was further amended to eliminate stock
appreciation rights. The purpose of the plan was to attract and retain key
employees and directors and to provide such persons with a proprietary interest
in Tucker through the granting and exercise of stock options. The maximum number
of shares of common stock available for issuance under the plan was 507,640
shares.

In June 1994, the Board of Directors of Tucker adopted the Tucker Drilling
Company, Inc. 1994 Non-Qualified Stock Option Plan. Officers and directors were
not eligible to receive options from this plan. The maximum number of shares
available for issuance under the plan was 82,880 shares.

Each of the plans provide that options may be granted to purchase shares at
prices not less than the fair market value at date of grant. The exercise period
is governed by option agreements, but in no event may the exercise period extend
beyond ten years from the date of grant. Existing stock options and other
employee incentive plans of Tucker became plans to purchase or receive common
stock of the Company upon consummation of the merger of the Company and Tucker.
At December 31, 1999, 8,288 options granted under the above mentioned plans were
outstanding to purchase common stock of the Company, 1,184 options have been
forfeited and 1,184 have expired as of December 31, 1999.

Non-Employee Directors' Stock Option Plan -- In June 1995, Patterson
adopted the Non-Employee Directors' Stock Option Plan (the "Outside Directors'
Plan"). The purpose of the Outside Directors' Plan is to encourage and provide
incentive for high level performance by non-employee directors of the Company.
An aggregate of 120,000 shares of Common Stock are reserved for issuance under
the Outside Directors' Plan to directors who are not employees of the Company.

As required by the Outside Directors' Plan, the exercise price of the
options will be equal to the fair market value of the Company's common stock on
the date of grant. Outside directors are automatically granted options to
purchase 20,000 shares and an additional 4,000 shares for each subsequent year
that they serve up to a maximum of 40,000 shares per director. Each option is
exercisable one year after the date of grant and expires five years from the
date of grant. The options become immediately exercisable in the event of a
change of control (as defined in the Outside Directors' Plan) of the Company.

The table below sets forth information regarding options granted under the
Outside Directors' Plan. Each of the options are granted with an exercise price
per share equal to fair market value on the grant date. A total

F-17
47
PATTERSON ENERGY, INC. AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)

10. STOCK OPTIONS AND WARRANTS -- (CONTINUED)
of 4,000 options granted under the Outside Directors' Plan have been forfeited
and 32,000 options have been exercised as of December 31, 1999.

<TABLE>
<CAPTION>
DATE GRANTED OPTIONS GRANTED EXERCISE PRICE/SHARE
- ------------ --------------- --------------------
<S> <C> <C> <C>
June 6, 1995..................... 40,000 ................... $ 2.25
June 6, 1996..................... 8,000 ................... 4.31
July 30, 1996.................... 20,000 ................... 4.38
June 6, 1997..................... 8,000 ................... 10.00
July 30, 1997.................... 4,000 ................... 15.81
June 6, 1998..................... 8,000 ................... 11.06
July 30, 1998.................... 4,000 ................... 7.38
June 6, 1999..................... 8,000 ................... 8.875
July 30, 1999.................... 4,000 ................... 9.625
-------
Total options
granted.............. 104,000
=======
</TABLE>

A summary of the status of the Company's stock options issued under the
Stock Incentive Plan and the Outside Directors' Plan as of December 31, 1997,
1998 and 1999 and the changes during each of the three years then ended are
presented below (in thousands):

<TABLE>
<CAPTION>
1997 1998 1999
--------------------------- --------------------------- ---------------------------
NO. OF NO. OF NO. OF
SHARES OF WEIGHTED SHARES OF WEIGHTED SHARES OF WEIGHTED
UNDERLYING AVERAGE UNDERLYING AVERAGE UNDERLYING AVERAGE
OPTIONS EXERCISE PRICE OPTIONS EXERCISE PRICE OPTIONS EXERCISE PRICE
---------- -------------- ---------- -------------- ---------- --------------
<S> <C> <C> <C> <C> <C> <C>
Outstanding at beginning of
the year.................... 732 $ 2.59 1,130 $ 9.47 1,475 $10.12
Granted at the money........ 648 14.76 515 9.79 1,144 3.75
----- ------ ----- ------ ----- ------
Total granted....... 1,380 8.30 1,645 9.57 2,619 7.34
Exercised................... 250 3.03 129 2.25 179 3.39
Forfeited................... -- -- 30 12.47 83 5.30
Expired..................... -- -- 11 13.26 6 12.34
----- ------ ----- ------ ----- ------
Outstanding at end of year.... 1,130 $ 9.47 1,475 $10.12 2,351 $ 7.70
===== ====== ===== ====== ===== ======
Exercisable at end of year.... 344 $ 6.83 563 $ 9.05 892 $ 9.34
===== ====== ===== ====== ===== ======
Weighted average fair value of
options granted during the
year........................ $ 6.15 $ 4.99 $ 2.15
====== ====== ======
</TABLE>

The following table summarizes information about stock options outstanding
at December 31, 1999:

<TABLE>
<CAPTION>
OPTIONS OUTSTANDING
------------------------------------------------
WEIGHTED OPTIONS EXERCISABLE
AVERAGE ------------------------------
NUMBER REMAINING WEIGHTED AVERAGE NUMBER WEIGHTED AVERAGE
OUTSTANDING CONTRACTED LIFE EXERCISE PRICE EXERCISABLE EXERCISE PRICES
----------- --------------- ---------------- ----------- ----------------
<S> <C> <C> <C> <C> <C>
$1.81 to $5.00 1,209,210 3.12 $8.40 329,170 $ 3.02
$5.01 to $15.81 1,141,300 12.55 $7.95 562,500 $13.03
--------- ----- ----- ------- ------
2,350,510 7.70 $8.18 891,670 $ 9.34
========= ===== ===== ======= ======
</TABLE>

The fair value of each stock option granted is estimated on the date of grant
using the Black-Scholes option-pricing model with the following weighted-average
assumptions for grants in 1995, 1996, 1997 and 1998 respectively; dividend yield
of 0.00%; risk-free interest rates are different for each grant and range from

F-18
48
PATTERSON ENERGY, INC. AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)

10. STOCK OPTIONS AND WARRANTS -- (CONTINUED)
4.98% to 6.60%; the expected term is 5 years; and a volatility of 38.68% for all
1995 and 1996 grants, 35.97% for all 1997 grants, 51.08% for all 1998 grants and
61.97% for all 1999 grants.

Public Relations Services Stock Options -- In June 1999, the Company issued
options covering a total of 50,000 shares of common stock at an exercise price
of $8.0625 per share to a consultant as partial compensation for public
relations services rendered to the Company. The options granted to the
consultant have an exercise price equal to the fair market value of the stock at
date of grant. The options were fully exercisable upon grant date. The Company
accounted for the option grant in accordance with SFAS No. 123, and as such, a
charge for stock compensation expense of $250,000, which represents the fair
value of the options on the date of grant, is included in general and
administrative expenses for the year ended December 31, 1999.

Pro Forma Stock-Based Compensation Disclosure -- Had the compensation cost
for the Company's stock-based compensation plan been determined consistent with
SFAS No. 123, the Company's net income (loss) and net income (loss) per common
share for 1997, 1998 and 1999 would approximate the pro forma amounts below:

<TABLE>
<CAPTION>
DECEMBER 31, 1997 DECEMBER 31, 1998 DECEMBER 31, 1999
------------------ ------------------ -------------------
AS PRO AS PRO AS PRO
REPORTED FORMA REPORTED FORMA REPORTED FORMA
-------- ----- -------- ----- -------- -----
<S> <C> <C> <C> <C> <C> <C>
SFAS No. 123 charge net of income
tax................................. $ -- $ 1,329 $ -- $ 1,817 $ -- $ 2,178
APB 25 charge......................... $ -- $ -- $ -- $ -- $ -- --
Net income (loss)..................... $22,242 $20,913 $ (325) $(2,142) $(9,127) $(11,305)
======= ======= ====== ======= ======= ========
Net income (loss) per common share:
Basic............................... $ 0.78 $ 0.73 $(0.01) $ (0.07) $ (0.28) $ (0.35)
======= ======= ====== ======= ======= ========
Diluted............................. $ 0.75 $ 0.71 $(0.01) $ (0.07) $ (0.28) $ (0.35)
======= ======= ====== ======= ======= ========
</TABLE>

The effects of applying SFAS No. 123 in this pro forma disclosure are not
indicative of future amounts. SFAS No. 123 does not apply to awards prior to
1995.

Stock Purchase Warrants -- In May 1995, the Company issued 300,000 warrants
exercisable at $2.25 per share as partial consideration for the purchase of
three drilling rigs and related equipment. The warrants were exercisable upon
issuance and would have expired on December 31, 1997. During November 1997, the
Company registered certain securities with the Commission on a Form S-3
Registration Statement which included the aforementioned 300,000 shares upon
exercise of the underlying warrants.

F-19
49
PATTERSON ENERGY, INC. AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)

10. STOCK OPTIONS AND WARRANTS -- (CONTINUED)
Tabular Summary -- The following table summarizes information regarding the
Company's stock options and warrants granted under the provisions of the
aforementioned plans: as well as stock options and warrants issued pursuant to
certain transactions described in Notes 2 and 9:

<TABLE>
<CAPTION>
WEIGHTED AVERAGE
GRANTED SHARES EXERCISE PRICE
- ------- ------ ----------------
<S> <C> <C>
1997............................................ 1,448,000 $11.02
1998............................................ 515,000 9.79
1999............................................ 1,193,800 3.93
EXERCISED
1997............................................ 1,808,720 $ 4.88
1998............................................ 132,720 2.31
1999............................................ 178,770 3.39
SURRENDERED
1997............................................ 1,184 $ 2.07
1998............................................ 43,568 12.10
1999............................................ 89,800 5.80
OUTSTANDING AT YEAR END
1997............................................ 1,144,856 $ 9.37
1998............................................ 1,483,568 10.08
1999............................................ 2,408,798 7.69
EXERCISABLE AT YEAR END
1997............................................ 347,800 $ 6.78
1998............................................ 573,936 8.96
1999............................................ 949,958 9.21
</TABLE>

11. LEASES

The Company incurred rent expense, consisting primarily of daily rental
charges for the use of drilling equipment, of $5.0 million, $4.3 million and
$2.5 million, for the periods ended December 31, 1997, 1998 and 1999,
respectively. The Company's obligations under non-cancelable operating lease
agreements are not material to the Company's operations.

12. INCOME TAXES

The provision for income taxes for the years ended December 31, 1997, 1998
and 1999 consists of the following (in thousands):

<TABLE>
<CAPTION>
1997 1998 1999
---- ---- ----
<S> <C> <C> <C>
Federal income tax expense (benefit):
Current....................................... $ 9,444 $(6,358) $ 2,767
Deferred...................................... 2,420 6,451 (7,108)
------- ------- -------
11,864 93 (4,341)
State income tax expense:
Current....................................... 909 -- --
Deferred...................................... 93 -- --
------- ------- -------
Total income tax expense (benefit).............. $12,866 $ 93 $(4,341)
======= ======= =======
</TABLE>

F-20
50
PATTERSON ENERGY, INC. AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)

12. INCOME TAXES -- (CONTINUED)
The effective income tax rate varies from the Federal statutory rate as
follows for the years ended December 31, 1997, 1998 and 1999:

<TABLE>
<CAPTION>
1997 1998 1999
---- ---- ----
<S> <C> <C> <C>
Statutory tax rate.................................. 35.0% 34.0% 34.0%
Nondeductible amortization.......................... -- (102.75) (2.2)
Statutory depletion in excess of basis.............. (1.1) 44.29 0.8
State income taxes.................................. 2.9 -- --
Non-deductible expenses............................. -- (12.83) (0.3)
Other, net.......................................... (0.2) (2.8) (0.1)
---- ------- ----
Effective tax rate.................................. 36.6% (40.09)% 32.2%
==== ======= ====
</TABLE>

In assessing the realizability of deferred tax assets, management considers
whether it is more likely than not that some portion or all of the deferred tax
assets will not be realized. The ultimate realization of deferred tax assets is
dependent upon the generation of future taxable income during the periods in
which those temporary differences become deductible. Management considers the
scheduled reversal of deferred tax liabilities, projected future taxable income,
and tax planning strategies in making this assessment. The Company expects the
deferred tax assets at December 31, 1999 to be realized as a result of the
reversal during the carryforward period of existing taxable temporary
differences giving rise to deferred tax liabilities and the generation of
taxable income in the carryforward period.

The tax effect of significant temporary differences representing deferred
tax assets and liabilities and changes therein were as follows (in thousands):

<TABLE>
<CAPTION>
JANUARY 1, NET DECEMBER 31, NET DECEMBER 31, NET DECEMBER 31,
1997 CHANGE 1997 CHANGE 1998 CHANGE 1999
---------- ------ ------------ ------ ------------ ------ ------------
<S> <C> <C> <C> <C> <C> <C> <C>
Deferred tax assets:
Net operating loss
carryforwards.......... $ 2,411 $(1,195) $1,216 $ 218 $ 1,434 $10,294 $ 11,728
Investment tax credit
carryforwards.......... 375 -- 375 -- 375 -- 375
AMT credit carryforwards... 282 -- 282 -- 282 2,933 3,215
Depletion carryforwards.... 394 (394) -- -- -- -- --
Other...................... 254 796 1,050 78 1,128 23 1,151
------- ------- ------ ------- -------- ------- --------
3,716 (793) 2,923 296 3,219 13,250 16,469
Valuation allowance........ -- -- -- -- -- -- --
------- ------- ------ ------- -------- ------- --------
Deferred tax assets........ 3,716 (793) 2,923 296 3,219 13,250 16,469
Deferred tax liabilities:
Property and equipment
basis difference....... (2,329) (1,553) (3,882) (7,335) (11,217) (5,976) (17,193)
------- ------- ------ ------- -------- ------- --------
Net deferred tax asset
(liability).......... $ 1,387 $(2,346) $ (959) $(7,039) $ (7,998) $ 7,274 $ (724)
======= ======= ====== ======= ======== ======= ========
</TABLE>

For tax return purposes, the Company had tax NOL carryforwards of
approximately $34.5 million at December 31, 1999. If unused, the aforementioned
tax NOL carryforwards will expire in various amounts in years 2004 to 2019.

F-21
51
PATTERSON ENERGY, INC. AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)

12. INCOME TAXES -- (CONTINUED)
During 1995, the Company's NOL carryforwards became subject to an annual
limitation due to a change of over 50% in the stock ownership of the Company as
defined in Internal Revenue Service Code Section 382(g). The NOL carryforwards
that can be utilized to offset net income in any year will be equal to
approximately $3.3 million plus any unused benefit from the prior year. The NOL
limitation is determined by the value of Patterson's equity on August 2, 1995,
the day prior to the ownership change, times 5.88%, the Federal long-term exempt
rate on that date as published by the U.S. Treasury Department, or $1.8 million,
and approximately $1.5 million which is determined by the value of Tucker's
equity on July 29, 1996, the day prior to consummation of the Merger, times
5.78%, the Federal long-term exempt rate on that date. At December 31, 1999,
approximately $4.2 million of NOL carryforwards were subject to the NOL
limitation.

13. EMPLOYEE BENEFITS

Effective January 1, 1992, the Company established a 401(k) profit sharing
plan for all eligible employees. Company contributions are discretionary. In
March 1998, the Company contributed $519,559 to the plan. The amount of the
contribution was included in accrued expenses at December 31, 1997. No matching
contribution was accrued or paid by the Company for the 1998 and 1999 fiscal
years.

14. BUSINESS SEGMENTS

The Company conducts its business through three distinct operating
activities: contract drilling of oil and natural gas wells, oil and natural gas
exploration, development, acquisition and production and, to a lesser degree,
providing drilling fluid services to operators in the oil and natural gas
industry. Although the drilling fluid operations do not meet the quantitative
thresholds to warrant disclosure as a business segment, management of the
Company considers its drilling fluid operations an integral part of its
business.

Contract Drilling Services. The Company markets its contract drilling
services to major oil companies and independent oil and natural gas producers.
The Company owns 119 drilling rigs, 114 of which are currently operable.
Currently, 90 of the operable drilling rigs are based in Texas (53 in west
Texas, 22 in south Texas, 11 in east Texas and four in north Texas), 10 are
based in southeast New Mexico, four in Oklahoma, four in Louisiana, three in
Utah, two in Mississippi, and one in Alabama. The drilling rigs have rated
maximum depth capabilities ranging from 8,000 feet to 25,000 feet.

Oil and Natural Gas Operations. The Company has been engaged in the
development, exploration, acquisition and production of oil and natural gas
since 1982. The Company's oil and natural gas activities are designed to
complement its land drilling operations and diversify the Company's overall
business strategy. These activities are primarily focused in mature producing
regions in the Permian Basin and south Texas. Oil and natural gas operations
comprised approximately 6% of the Company's consolidated operating revenues for
the year ended December 31, 1999. The Company's business strategy for its oil
and natural gas operations is to increase its oil and natural gas reserves
primarily through developmental and exploratory drilling in producing areas. At
December 31, 1999, the Company's proved developed reserves were approximately
1.9 million BOE and had a present value (discounted at 10% before income taxes)
of estimated future net revenues of approximately $17.2 million. The industry's
significantly reduced commodity prices, primarily the price of crude oil, have
had a negative impact on the valuation of the Company's oil and natural gas
reserves. For each of the years ended December 31, 1997, 1998 and 1999, the
Company incurred approximately $355,000, $3.8 million and $275,000,
respectively, of impairment charge to its oil and natural gas properties.

Drilling Fluid Services. The Company provides contract drilling fluid
services to numerous operators in the oil and natural gas industry. Operating
revenues derived from these activities constitute approximately 8% of the
Company's consolidated operating revenues. Patterson believes that these
contract services integrate well with its other core operating activities. The
drilling fluid operations were added by the Company during

F-22
52
PATTERSON ENERGY, INC. AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)

14. BUSINESS SEGMENTS -- (CONTINUED)
1998 with its acquisitions of Lone Star Mud, Inc. during January 1998 and Tejas
Drilling Fluids, Inc. in September 1998 and have operations in Texas, New
Mexico, Oklahoma and Colorado.

<TABLE>
<CAPTION>
DECEMBER 31,
------------------------------
1997 1998 1999
---- ---- ----
<S> <C> <C> <C>
Revenues:
Contract drilling......................................... $178,332 $165,997 $131,287
Oil and natural gas....................................... 12,445 7,170 8,563
Drilling fluids........................................... -- 13,397 11,686
-------- -------- --------
Total revenues.................................... $190,777 $186,564 $151,536
======== ======== ========
Income (loss) from operations:
Contract drilling......................................... $ 32,745 $ 9,329 $(10,283)
Oil and natural gas....................................... 2,352 (6,217) 1,874
Drilling fluids........................................... -- 360 (1,403)
-------- -------- --------
35,097 3,472 (9,812)
Interest income........................................... 1,056 767 445
Interest expense.......................................... (1,045) (4,471) (4,101)
-------- -------- --------
Income (loss) before income taxes......................... $ 35,108 $ (232) $(13,468)
======== ======== ========
Identifiable assets:
Contract drilling......................................... $162,726 $185,237 $167,599
Oil and natural gas....................................... 23,777 15,411 6,644
Drilling fluids........................................... -- 20,063 13,577
Corporate(a).............................................. 16,697 15,894 55,855
-------- -------- --------
Total assets................................................ $203,200 $236,605 $243,675
======== ======== ========
Depreciation, depletion and amortization:
Contract drilling......................................... $ 12,541 $ 22,416 $ 24,417
Oil and natural gas....................................... 4,956 4,780 2,674
Drilling fluids........................................... -- 895 1,065
-------- -------- --------
Total depreciation, depletion and amortization.............. $ 17,497 $ 28,091 $ 28,156
======== ======== ========
Capital expenditures:
Contract drilling......................................... $ 74,495 $ 67,471 $ 17,917
Oil and natural gas....................................... 9,766 7,734 5,260
Drilling fluids........................................... -- 4,396 195
-------- -------- --------
Total capital expenditures.................................. $ 84,261 $ 79,601 $ 23,372
======== ======== ========
</TABLE>

- ---------------

(a) Corporate assets primarily include cash on hand managed by the parent
corporation and certain deferred Federal income tax assets.

F-23
53
PATTERSON ENERGY, INC. AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)

15. OIL AND NATURAL GAS EXPENDITURES

Gross oil and natural gas expenditures by the Company for the years ended
December 31, 1997, 1998 and 1999 are summarized below (in thousands):

<TABLE>
<CAPTION>
DECEMBER 31,
--------------------------
1997 1998 1999
---- ---- ----
<S> <C> <C> <C>
Property acquisition costs....................... $ 2,577 $1,585 $ 2,185
Exploration costs................................ 7,680 6,510 7,178
Development costs................................ 2,412 1,126 2,061
------- ------ -------
$12,669 $9,221 $11,424
======= ====== =======
</TABLE>

The aggregate amount of capitalized costs of oil and natural gas properties
as of December 31, 1998 and 1999 is comprised of the following (in thousands):

<TABLE>
<CAPTION>
DECEMBER 31,
-------------------
1998 1999
---- ----
<S> <C> <C>
Proved properties....................................... $ 27,856 $ 32,962
Accumulated depreciation, depletion and amortization.... (21,809) (24,893)
-------- --------
Net proved properties................................... $ 6,047 $ 8,069
======== ========
</TABLE>

16. CONCENTRATIONS OF CREDIT RISK

Financial instruments, which potentially subject the Company to
concentrations of credit risk, consist primarily of demand deposits, temporary
cash investments and trade receivables.

The Company believes that it places its demand deposits and temporary cash
investments with high credit quality financial institutions. At December 31,
1998 and 1999, the Company's demand deposits and temporary cash investments
consisted of the following (in thousands):

<TABLE>
<CAPTION>
1998 1999
---- ----
<S> <C> <C>
Deposit in FDIC and SIPC-insured institutions under
$100,000 and cash on hand............................... $ 1,755 $ 1,361
Deposit in FDIC and SIPC-insured institutions over
$100,000 and cash on hand............................... 11,097 11,146
------- -------
12,852 12,507
Less outstanding checks and other reconciling items....... (3,866) (3,715)
------- -------
Cash and cash equivalents................................. $ 8,986 $ 8,792
======= =======
</TABLE>

Concentrations of credit risk with respect to trade receivables are
primarily focused on contract drilling receivables. The concentration is
mitigated by the diversification of customers for which the Company provides
drilling services. No significant losses from individual contracts were
experienced during the years ended December 31, 1997, 1998 and 1999. Included in
general and administrative expense for the periods ended December 31, 1997 and
1998 are provisions for doubtful receivables of $122,069 and $90,000,
respectively.

The carrying values of cash and cash equivalents, marketable securities and
trade receivables approximate fair value due to the short-term maturity of these
assets.

F-24
54
PATTERSON ENERGY, INC. AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)

17. RELATED PARTY TRANSACTIONS

Use of Assets -- The Company leases a 1981 Beech King-Air 90 airplane owned
by an affiliate of the Company's Chairman of the Board/Chief Executive Officer.
Under the terms of the lease, the Company pays a monthly rental of $9,200 and
its proportionate share of the costs of fuel, insurance, taxes and maintenance
of the aircraft. The Company paid approximately $171,803, $211,495 and $222,583
for the lease of the airplane during 1997, 1998 and 1999, respectively.

Contract Drilling Services -- A company owned in part by a relative of the
Chairman of the Board/Chief Executive Officer, contracted drilling services from
the Company during 1997 and 1999. Revenues for 1997 and 1999 were approximately
$1.4 million and $275,642 respectively, for these services.

Sales of Oil -- A company owned in part by a relative of the Chairman of
the Board/Chief Executive Officer, acted as the first purchaser of oil produced
from leases operated by the Company during 1997, 1998 and 1999. Sales of oil to
that entity, both royalty and working interest (including the Company) were
approximately $12.9 million, $8.1 million and $8.4 million for 1997, 1998 and
1999, respectively.

Joint Operation of Oil and Natural Gas Properties -- The Company operates
certain oil and natural gas properties in which the Chairman of the Board/Chief
Executive Officer, the President/Chief Operating Officer and other persons or
entities related to the Company purchased a joint interest ownership with the
Company and other industry partners. The Company made oil and natural gas
production payments (net of royalty) of $10.5 million, $6.9 million and $6.1
million from these properties in 1997, 1998 and 1999, respectively, to the
aforementioned persons or entities. These persons or entities reimbursed the
Company for joint operating costs of $12.8 million, $7.4 million and $5.9
million in 1997, 1998 and 1999, respectively.

18. SUBSEQUENT EVENT

On February 4, 2000, Patterson Energy, Inc. executed an Agreement in
Principle whereby Patterson would acquire High Valley Drilling, Inc.
Consideration for the acquisition will include 1,150,000 unregistered shares of
Patterson's common stock valued at $18 per share and three-year warrants to
acquire an additional 127,000 shares at an exercise price of $22.00 per share.

19. SUPPLEMENTARY OIL AND NATURAL GAS RESERVE INFORMATION AND RELATED DATA
(UNAUDITED)

The following table sets forth information with respect to quantities of
net proved developed oil and natural gas reserves and changes in those reserves
for the years ended December 31, 1997, 1998 and 1999. The quantities were
estimated by an independent petroleum engineer. The Company's proved developed
oil and natural gas reserves are located entirely within the United States.

ESTIMATES OF RESERVES AND PRODUCTION PERFORMANCE ARE SUBJECTIVE AND MAY
CHANGE MATERIALLY AS ACTUAL PRODUCTION INFORMATION BECOMES AVAILABLE.

F-25
55
PATTERSON ENERGY, INC. AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)

19. SUPPLEMENTARY OIL AND NATURAL GAS RESERVE INFORMATION AND RELATED DATA
(UNAUDITED) -- (CONTINUED)
OIL AND NATURAL GAS RESERVE QUANTITIES

<TABLE>
<CAPTION>
OIL (BBLS) GAS (MCF)
---------- ---------
(IN THOUSANDS)
<S> <C> <C>
Estimated quantity, January 1, 1997.................. 1,062 7,627
Revision in previous estimates....................... 193 (973)
Extensions, discoveries and other additions.......... 411 294
Purchases............................................ -- --
Sales of reserves-in-place........................... (336) (2,003)
Production........................................... (385) (1,157)
----- ------
Estimated quantity, January 1, 1998.................. 945 3,788
Revision in previous estimates....................... 140 (596)
Extensions, discoveries and other additions.......... 146 1,100
Purchases............................................ -- --
Sales of reserves-in-place........................... (1) (7)
Production........................................... (284) (795)
----- ------
Estimated quantity, January 1, 1999.................. 946 3,490
Revision in previous estimates....................... (169) 287
Extensions, discoveries and other additions.......... 683 1,358
Purchases............................................ -- --
Sales of reserves-in-place........................... -- --
Production........................................... (255) (1,017)
----- ------
Estimated quantity, January 1, 2000.................. 1,205 4,118
===== ======
</TABLE>

RESULTS OF OPERATIONS FOR OIL AND NATURAL GAS PRODUCING ACTIVITIES

<TABLE>
<CAPTION>
YEAR ENDED DECEMBER 31,
--------------------------
1997 1998 1999
---- ---- ----
(IN THOUSANDS)
<S> <C> <C> <C>
Oil and natural gas sales................................... $10,773 $ 5,641 $6,834
Gain (loss) on sale of oil and natural gas properties....... 803 68 9
------- ------- ------
11,576 5,709 6,843
------- ------- ------
Costs and expenses:
Production costs.......................................... 2,274 1,924 1,720
Exploration expenses...................................... 2,128 1,752 780
Depreciation, depletion and amortization.................. 4,956 4,780 2,674
Impairment of oil and natural gas properties.............. 355 3,816 275
Income tax expense (benefit).............................. 633 (2,231) 533
------- ------- ------
10,346 10,041 5,982
------- ------- ------
Results of operations for oil and natural gas producing
activities................................................ $ 1,230 $(4,332) $ 861
======= ======= ======
</TABLE>

STANDARDIZED MEASURE OF FUTURE NET CASH FLOWS OF PROVED DEVELOPED OIL AND
NATURAL GAS RESERVES, DISCOUNTED AT 10% PER ANNUM

F-26
56
PATTERSON ENERGY, INC. AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)

19. SUPPLEMENTARY OIL AND NATURAL GAS RESERVE INFORMATION AND RELATED DATA
(UNAUDITED) -- (CONTINUED)

<TABLE>
<CAPTION>
YEAR ENDED DECEMBER 31,
---------------------------
1997 1998 1999
---- ---- ----
(IN THOUSANDS)
<S> <C> <C> <C>
Future gross revenues........................... $23,933 $16,451 $39,024
Future development and production costs......... (8,921) (7,219) (14,283)
Future income tax expense (a)................... (3,679) (1,929) (7,392)
------- ------- -------
Future net cash flows........................... 11,333 7,303 17,349
Discount at 10% per annum....................... (2,710) (1,953) (5,267)
------- ------- -------
Standardized measure of discounted future net
cash flows.................................... $ 8,623 $ 5,350 $12,082
======= ======= =======
</TABLE>

- ---------------

(a) Future income taxes are computed by applying the statutory tax rate to
future net cash flows less the tax basis of the properties and net operating
loss attributable to oil and gas operations and investment tax credit
carryforwards as of year-end; statutory depletion and tax credits applicable
to future oil and gas-producing activities are also considered in the income
tax computation.

CHANGES IN THE STANDARDIZED MEASURE OF NET CASH FLOWS OF PROVED DEVELOPED OIL
AND GAS RESERVES DISCOUNTED AT
10% PER ANNUM

<TABLE>
<CAPTION>
YEAR ENDED DECEMBER 31,
---------------------------
1997 1998 1999
---- ---- ----
(IN THOUSANDS)
<S> <C> <C> <C>
Standardized measure at beginning of year................... $13,300 $ 8,623 $ 5,350
Sales and transfers of oil and gas produced, net of
production costs.......................................... (5,195) (2,773) (3,696)
Net changes in sales price and future production and
development costs......................................... 1,347 (5,056) 3,177
Extensions, discoveries and improved recovery, less related
costs..................................................... 5,061 3,018 3,711
Sales of minerals-in-place.................................. (4,775) (9) --
Revision of previous quantity estimates..................... (1,024) (804) 6,872
Accretion of discount....................................... 1,922 1,193 709
Changes in production rates and other....................... 231 (224) 1,614
Net change in income taxes.................................. (2,244) 1,382 (5,655)
------- ------- -------
Standardized measure at end of year......................... $ 8,623 $ 5,350 $12,082
======= ======= =======
</TABLE>

F-27
57

SIGNATURES

Pursuant to the requirements of Section 13 or 15(d) of the Securities
Exchange Act of 1934, Patterson Energy, Inc. has duly caused this report to be
signed on its behalf by the undersigned, thereunto duly authorized.

PATTERSON ENERGY, INC.

Date: March 30, 2000 By: /s/ CLOYCE A. TALBOTT

------------------------------------
Cloyce A. Talbott
Chairman of the Board and Chief
Executive Officer

Pursuant to the requirements of the Securities Exchange Act of 1934, this
report has been signed by the following persons on behalf of Patterson Energy,
Inc. and in the capacities indicated as of March 30, 1999.

<TABLE>
<CAPTION>
SIGNATURE TITLE
--------- -----
<C> <S>

/s/ CLOYCE A. TALBOTT Chairman of the Board, Chief Executive
- -------------------------------------------------------- Officer and Director
Cloyce A. Talbott
(Principal Executive Officer)

/s/ A. GLENN PATTERSON President, Chief Operating Officer and
- -------------------------------------------------------- Director
A. Glenn Patterson

/s/ JONATHAN D. NELSON Vice President -- Finance, Chief
- -------------------------------------------------------- Financial Officer, Secretary and
Jonathan D. Nelson Treasurer
(Principal Accounting Officer)

/s/ ROBERT C. GIST Director
- --------------------------------------------------------
Robert C. Gist

/s/ SPENCER D. ARMOUR, III Director
- --------------------------------------------------------
Spencer D. Armour, III

/s/ VINCENT A. ROSSI, JR. Director
- --------------------------------------------------------
Vincent A. Rossi, Jr.
</TABLE>
58

EXHIBIT INDEX

<TABLE>
<CAPTION>
EXHIBIT
NUMBER DESCRIPTION
------- -----------
<C> <S>
2.1 Plan and Agreement of Merger dated October 14, 1993, between
Patterson Energy, Inc., a Texas corporation, and Patterson
Energy, Inc., a Delaware corporation, together with related
Certificates of Merger.(1)
2.2 Agreement and Plan of Merger, dated April 22, 1996 among
Patterson Energy, Inc., Patterson Drilling Company and
Tucker Drilling Company, Inc.(2)
2.2.1 Amendment to Agreement and Plan of Merger, dated May 16,
1996 among Patterson Energy, Inc., Patterson Drilling
Company and Tucker Drilling Company, Inc.(3)
2.3 Asset Purchase Agreement, dated June 4, 1997, among
Patterson Energy Inc., Patterson Drilling Company and
Wes-Tex Drilling Company.(3)
2.3.1 Amendment to Asset Purchase Agreement, dated June 4, 1997,
among Patterson Energy Inc., Patterson Drilling Company and
Wes-Tex Drilling Company.(5)
2.4 Agreement and Plan of Merger, dated January 20, 1998, among
Patterson Energy, Inc., Patterson Onshore Drilling Company
and Robertson Onshore Drilling Company.(7)
2.5 Stock Purchase Agreement, dated January 5, 1998, among
Patterson Energy, Inc., Spencer D. Armour, III. And Richard
G. Price.(19)
2.6 Stock Purchase Agreement, dated September 17, 1998, among
Lone Star Mud, Inc. and Mark Campbell (shareholder of Tejas
Drilling Fluids, Inc.).(4)
2.7 Asset Purchase Agreement, dated January 27, 1999, among
Patterson Energy, Inc., Patterson Drilling Company and Padre
Industries, Inc.(4)
3.1 Restated Certificate of Incorporation.(8)
3.1.1 Certificate of Amendment to the Certificate of
Incorporation.(9)
3.2 Bylaws.(1)
4.1 Excerpt from Restated Certificate of Incorporation of
Patterson Energy, Inc. regarding authorized Common Stock and
Preferred Stock.(10)
10.1 Loan and Security Agreement dated December 21, 1999 among
Patterson Drilling Company and Transamerica Equipment
Financial Services Corporation.
10.1.1 Promissory Note dated December 21, 1999 between Patterson
Drilling Company and Transamerica Equipment Financial
Services Corporation.
10.1.2 Corporate guarantees of Lone Star Mud, Inc. and Patterson
Energy, Inc.
10.2 Aircraft Lease, dated December 20, 1999, (effective January
1, 2000) between Talbott Aviation, Inc. and Patterson
Energy, Inc.
10.3 Participation Agreement, dated October 19, 1994, between
Patterson Petroleum Trading Company, Inc. and BHT Marketing,
Inc.(12)
10.3.1 Participation Agreement dated October 24, 1995, between
Patterson Petroleum Trading Company, Inc. and BHT Marketing,
Inc.(13)
10.4 Crude Oil Purchase Contract, dated October 19, 1994, between
Patterson Petroleum, Inc. and BHT Marketing, Inc.(14)
10.4.1 Crude Oil Purchase Contract, dated October 24, 1995, between
Patterson Petroleum, Inc. and BHT Marketing, Inc.(13)
10.5 Patterson Energy, Inc. 1993 Stock Incentive Plan, as
amended.(15)
</TABLE>
59

<TABLE>
<CAPTION>
EXHIBIT
NUMBER DESCRIPTION
------- -----------
<C> <S>
10.6 Patterson Energy, Inc. Non-Employee Directors' Stock Option
Plan, as amended.(16)
10.7 Model Form Operating Agreement.(17)
10.8 Form of Drilling Bid Proposal and Footage Drilling
Contract.(17)
10.9 Form of Turnkey Drilling Agreement.(17)
21.1 Subsidiaries of the registrant.
23.1 Consent of Independent Accountants -- PricewaterhouseCoopers
LLP.
23.2 Consent of Independent Petroleum Engineer -- M. Brian
Wallace, P.E.
27.1 Financial Data Schedule as of December 31, 1999 and for the
twelve months then ended.
</TABLE>

- ---------------

(1) Incorporated herein by reference to Item 27, "Exhibits" to Amendment No. 2
to Registration Statement on Form SB-2 (File No. 33-68058-FW); filed
October 28, 1993.

(2) Incorporated by reference to Item 7, "Financial Statements and Exhibits" to
Form 8-K dated April 22, 1996 and filed on April 30, 1996.

(3) Incorporated by reference to Item 7, "Financial Statements and Exhibits" to
Form 8-K dated May 16, 1996 and filed on May 22, 1996.

(4) Incorporated herein by reference to Item 14, "Exhibits, Financial Statement
Schedules and Reports on Form 8-K" to Form 10-K for the year ended December
31, 1998.

(5) Incorporated herein by reference to Item 7, "Financial Statements and
Exhibits", to Form 8-K dated September 3, 1997; filed September 11, 1997.

(6) Incorporated herein by reference to Item 7, "Financial Statements and
Exhibits" to Form 8-K dated November 14, 1997 and filed December 24, 1997.

(7) Incorporated herein by reference to Item 7, "Financial Statements and
Exhibits," to Form 8-K dated January 23, 1998; filed February 3, 1998.

(8) Incorporated herein by reference to Item 6, "Exhibits and Reports on Form
8-K" to Form 10-Q for the quarterly period ended September 30, 1996; filed
August 12, 1996.

(9) Incorporated herein by reference to Item 6. "Exhibits and Reports on Form
8-K" to Form 10-Q for the quarterly period ended June 30, 1997; filed
August 14, 1997.

(10) Incorporated herein by reference to Item 16, "Exhibits" to Registration
Statement on Form S-3 filed with the Securities Exchange Commission on
December 18, 1996.

(11) Incorporated herein by reference to Item 7, "Financial Statements and
Exhibits", to Form 8-K dated September 12, 1997; filed September 19, 1997.

(12) Incorporated herein by reference to Item 27, "Exhibits" to Post Effective
Amendment No. 1 to Registration Statement on Form SB-2 (File No.
33-68058-FW).

(13) Incorporated by reference to Item 7, "Financial Statements and Exhibits" to
Form 10-KSB for the year ended December 31, 1995.

(14) Incorporated by reference to Item 5, "Other Items" to Form 8-K dated
December 1, 1995 and filed on January 16, 1996.

(15) Incorporated herein by reference to Item 8, "Exhibits" to Registration
Statement on Form S-8 (File No. 333-47917); filed March 13, 1998.

(16) Incorporated herein by reference to Item 8, "Exhibits" to Registration
Statement on Form S-8 (File No. 33-39471); filed November 4, 1997.

(17) Incorporated by reference to Item 27, "Exhibits" to Registration Statement
filed with the Securities and Exchange Commission on August 30, 1993.
60

(18) Incorporated by reference to Item 14, "Exhibits, Financial Statement
Schedules and Reports on Form 8-K" to Form 10-K dated December 31, 1997.

(19) Incorporated herein by reference to Item 16, "Exhibits" to Registration
Statement on Form S-3 filed with the Securities Exchange Commission on
January 5, 1998.