PATTERSON ENERGY INC
8-K/A, 1998-04-21
DRILLING OIL & GAS WELLS
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<PAGE>   1

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

                                  UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549



                                    FORM 8-KA
                                 AMENDMENT NO. 1


                                 CURRENT REPORT



                     Pursuant to Section 13 or 15(d) of the
                         Securities Exchange Act of 1934

        Date of Report (Date of earliest event reported) February 6, 1998


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

          DELAWARE                 0-22664                    75-2504748
(State or other jurisdiction     (Commission                (I.R.S. Employer
      of incorporation)          File Number)              Identification No.)



  4510 LAMESA HIGHWAY, SNYDER, TEXAS                              79549
(Address of principal executive offices)                        (Zip Code)


                                 (915) 573-1104
              (Registrant's telephone number, including area code)


                                    No Change
         (Former name or former address, if changed since last report.)

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

<PAGE>   2


ITEM 7.  FINANCIAL STATEMENTS AND EXHIBITS.

     (a)   Financial statements of business acquired.


                          INDEPENDENT AUDITOR'S REPORT



To the Board of Directors and Shareholders
Robertson Onshore Drilling Company


We have audited the accompanying balance sheet of Robertson Onshore Drilling
Company (a Texas Subchapter S Corporation) as of December 31, 1997, and the
related statements of income, changes in shareholders' equity and cash flows for
the year then ended. 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 audit.

We conducted our audit in accordance with generally accepted auditing standards.
Those standards 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. An audit also includes
assessing the accounting principles used and significant estimates made by
management, as well as evaluating the overall financial statement presentation.
We believe that our audit provides a reasonable basis for our opinion.

   
In our opinion, the financial statements referred to above present fairly, in
all material respects, the financial position of Robertson Onshore Drilling
Company as of December 31, 1997, and the results of its operations and its cash
flows for the year then ended in conformity with generally accepted accounting
principles.
    



                                                            BELEW AVERITT LLP


Dallas, Texas
March 6, 1998






                                      1
<PAGE>   3


                       ROBERTSON ONSHORE DRILLING COMPANY

                                  Balance Sheet

                                December 31, 1997


<TABLE>
<CAPTION>

                                     ASSETS

Current assets:
<S>                                                                                       <C>          
   Cash                                                                                   $     528,074
   Accounts receivable, less allowance for doubtful accounts of $75,000                       5,513,840
   Due from insurance company (Note 10)                                                         625,202
   Costs of uncompleted drilling contracts in excess of related billings                        838,490
   Prepaid assets                                                                               352,953
                                                                                          -------------

      Total current assets                                                                    7,858,559

Property and equipment, at cost, net (Notes 3 and 6)                                          9,010,924

Deposits                                                                                         13,845
                                                                                          -------------
      Total assets                                                                        $  16,883,328
                                                                                          =============


                      LIABILITIES AND SHAREHOLDERS' EQUITY

Current liabilities:
   Note payable (Note 6)                                                                  $   1,800,000
   Accounts payable                                                                           3,088,696
   Accrued expenses:
     Drilling costs                                                                           1,217,383
     Bonuses                                                                                    403,119
     Insurance                                                                                  169,182
     State income taxes                                                                         160,771
     Other                                                                                      342,551
                                                                                          -------------

      Total current liabilities                                                               7,181,702

Commitments and contingencies (Note 7)                                                              --

Shareholders' equity (Notes 4, 5 and 8):
   Common stock, par value $1 per share; 1,000,000 shares
    authorized; 169,217 shares issued                                                           169,217
   Additional paid-in capital                                                                 2,311,544
   Retained earnings                                                                          7,332,142
   Treasury stock, 4,953 shares at cost                                                        (111,277)
                                                                                          -------------

      Total shareholders' equity                                                              9,701,626
                                                                                          -------------
      Total liabilities and shareholders' equity                                          $  16,883,328
                                                                                          =============

</TABLE>



                 See accompanying notes to financial statements.


                                       2
<PAGE>   4



                       ROBERTSON ONSHORE DRILLING COMPANY

                               Statement of Income

                          Year ended December 31, 1997

<TABLE>
<CAPTION>


<S>                                                                                       <C>          
Contract drilling revenues                                                                $  38,332,382

Operating costs:
   Direct drilling costs                                                                     29,200,887
   Depreciation                                                                               1,225,667
   General and administrative                                                                 3,626,599
                                                                                          -------------

                                                                                             34,053,153
                                                                                          -------------
Operating income                                                                              4,279,229

Other income (expense):
   Investment income                                                                             27,694
   Other income                                                                                  23,254
   Loss on sale of assets                                                                       (58,244)
   Interest expense                                                                            (109,564)
                                                                                          -------------

                                                                                               (116,860)
                                                                                          -------------
Income before income taxes                                                                    4,162,369

Provision for state income taxes                                                                233,400
                                                                                          -------------
Net income                                                                                $   3,928,969
                                                                                          =============

</TABLE>



                 See accompanying notes to financial statements.


                                       3

<PAGE>   5





                       ROBERTSON ONSHORE DRILLING COMPANY

                  Statement of Changes in Shareholders' Equity

                          Year ended December 31, 1997

<TABLE>
<CAPTION>


                                               Common Stock      Additional
                                          ---------------------    Paid-in         Retained        Treasury
                                           Shares       Amount     Capital         Earnings         Stock        Total
                                          -------    --------  -----------     -----------      ----------    -----------

<S>                                       <C>       <C>        <C>             <C>              <C>           <C>        
Balance, January 1, 1997                  169,217   $ 169,217  $ 2,290,995     $ 4,717,285      $ (147,224)   $ 7,030,273

Declaration of dividends (Note 8)            --          --          --         (1,314,112)           --       (1,314,112)

Sale of treasury stock (600 shares) 
 (Note 5)                                    --          --         13,816           --             13,480         27,296

Exercise of stock options
 (1,000 shares)(Note 5)                      --          --          6,733           --             22,467         29,200

Net income                                   --          --          --          3,928,969            --        3,928,969
                                          -------   ---------  -----------     -----------      ----------    -----------

Balance, December 31, 1997                169,217   $ 169,217  $ 2,311,544     $ 7,332,142      $ (111,277)   $ 9,701,626
                                          =======   =========  ===========     ===========      ==========    ===========

</TABLE>


                See accompanying notes to financial statements.


                                       4
<PAGE>   6


                       ROBERTSON ONSHORE DRILLING COMPANY

                             Statement of Cash Flows

                          Year ended December 31, 1997
<TABLE>
<CAPTION>


<S>                                                                                       <C>          
Cash flows from operating activities:
   Net income                                                                             $   3,928,969
   Adjustments to reconcile net income to net cash
    provided by operating activities:
      Depreciation                                                                            1,225,667
      Loss on sale of assets                                                                     58,244
      Change in operating assets and liabilities:
      Accounts receivable                                                                    (1,763,784)
      Due from insurance company                                                               (420,878)
      Costs of uncompleted drilling contracts in
       excess of related billings                                                                85,339
      Other current assets                                                                       29,543
      Accounts payable                                                                          684,514
      Accrued expenses                                                                          900,264
                                                                                          -------------

   Net cash provided by operating activities                                                  4,727,878

Cash flows from investing activities:
   Acquisition of property, plant and equipment                                              (3,080,864)
   Proceeds from sale of equipment                                                               85,870
                                                                                          -------------
   Net cash used in investing activities                                                     (2,994,994)

Cash flows from financing activities:
   Payment of dividends                                                                      (1,314,112)
   Proceeds from stock issuance                                                                  56,496
                                                                                          -------------

   Net cash used in financing activities                                                     (1,257,616)
                                                                                          -------------

Net increase in cash                                                                            475,268

Cash, January 1, 1997                                                                            52,806
                                                                                          -------------

Cash, December 31, 1997                                                                   $     528,074
                                                                                          =============


Supplemental cash flow information:
   Cash paid for interest                                                                 $     109,564
                                                                                          =============

   Cash paid for state income taxes                                                       $      72,629
                                                                                          =============

</TABLE>



                 See accompanying notes to financial statements.


                                       5

<PAGE>   7


                       ROBERTSON ONSHORE DRILLING COMPANY

                          Notes to Financial Statements

                                December 31, 1997



1.      DESCRIPTION OF BUSINESS

        Robertson Onshore Drilling Company (the Company), a Texas Subchapter S
        Corporation, was formed September 18, 1986 to own and operate drilling
        rigs within the continental United States. At December 31, 1997, the
        Company owned and operated 15 rigs and provided contract drilling
        services in Texas, Louisiana, Mississippi and Alabama.


2.      SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

        CASH AND CASH EQUIVALENTS

        The Company considers highly-liquid investments with original maturities
        of three months or less to be components of cash.

        CONCENTRATIONS OF CREDIT RISK

        The Company maintains cash in excess of the limit insured by the Federal
        Deposit Insurance Corporation (FDIC) in financial institutions which the
        Company considers of high credit quality. Concentrations of credit risk
        with respect to trade receivables are limited due to the number of
        customers comprising the Company's customer base. Management does not
        anticipate significant credit losses from such financial instruments.

        DRILLING OPERATIONS

        The Company follows the percentage-of-completion method of accounting
        for day work and footage 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 significant
        losses are anticipated.

        PROPERTY AND EQUIPMENT

   
        Depreciation has been provided for using the straight-line method over 
        estimated useful lives of 5 to 10-years. Repairs and maintenance costs
        are charged to expense as incurred. Significant repairs are capitalized.
    


                                       6

<PAGE>   8



        IMPAIRMENT OF LONG-LIVED ASSETS

        In accordance with Statement of Financial Accounting Standards (SFAS)
        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 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. The
        Company did not reduce the costs of its long-lived assets at December
        31, 1997 as a result of applying the provisions of SFAS 121.

        INCOME TAXES

        As a Subchapter S Corporation, the shareholders are allocated their
        pro-rata share of the Company's taxable income or loss for inclusion in
        their personal income tax returns. Accordingly, no provision for Federal
        income taxes is reflected in the accompanying financial statements. The
        Company's tax returns and the amount of the Company's taxable income or
        loss are subject to examination by Federal and state taxing authorities.
        If such examinations result in changes in taxable income or loss, the
        tax liability of the shareholders could be changed accordingly.

        The Company does provide for state income taxes based on the effective
        rates of the applicable states.

        ACCOUNTING FOR STOCK-BASED COMPENSATION

        Statement of Financial Accounting Standards No. 123, "Accounting for
        Stock-Based Compensation" (SFAS 123), encourages, but does not require,
        companies to record compensation cost for stock-based compensation plans
        at fair value (Note 4). The Company has elected to continue to account
        for stock-based compensation using the intrinsic value method prescribed
        in Accounting Principles Board Opinion No. 25, "Accounting for Stock
        Issued to Employees" (APB 25), and related interpretations. Accordingly,
        compensation cost for stock options is measured as the excess, if any,
        of the fair value of the Company's stock at the measurement date
        (generally the date of the grant) over the amount the employee must pay
        to acquire the stock.

        FAIR VALUE OF FINANCIAL INSTRUMENTS

        For the majority of the Company's financial instruments, including cash,
        accounts receivable, debt, accounts payable and accrued expenses, the
        carrying amounts approximate fair value due to their short maturities.

        MANAGEMENT ESTIMATES

        The preparation of financial statements in conformity with generally
        accepted accounting principles requires management to make estimates and
        assumptions that affect the amounts reported in the financial statements
        and accompanying notes. Actual results may vary from management's
        estimates.

        RECENTLY ISSUED ACCOUNTING STANDARDS

        The Company adopted the provisions of SFAS No. 129, "Disclosures of
        Information about Capital Structure," effective for the year ended
        December 31, 1997. This statement consolidates existing pronouncements
        on required disclosures about a company's capital structure including a
        brief discussion of rights and privileges for securities outstanding.
        The adoption of this statement had no material effect on the Company's
        financial statements.


                                       7
<PAGE>   9



        In June 1997, the Financial Accounting Standards Board issued SFAS No.
        130, "Reporting Comprehensive Income." This statement requires that all
        items required to be recognized under accounting standards as components
        of comprehensive income be reported in a financial statement that is
        displayed with the same prominence as other financial statements. SFAS
        No. 130 is effective for financial statement periods beginning after
        December 15, 1997. Management does not anticipate that this statement
        will have a significant effect on the Company's financial statements.

        In June 1997, the Financial Accounting Standards Board issued SFAS No.
        131, "Disclosures about Segments of an Enterprise and Related
        Information." This statement establishes standards for reporting
        information about operating segments in annual financial statements and
        requires reporting of selected information about operating segments in
        interim financial reports issued to shareholders. It also establishes
        standards for related disclosures about products and services,
        geographic areas and major customers. SFAS No. 131 is effective for
        fiscal years beginning after December 15, 1997. Management does not
        anticipate that this statement will have a significant effect on the
        Company's financial statements.


3.      PROPERTY AND EQUIPMENT

        Major classifications of property and equipment at December 31, 1997 are
        summarized below:
<TABLE>

<S>                                                                                        <C>         
        Drilling rigs and equipment                                                        $ 12,274,568
        Furniture and fixtures                                                                  243,078
        Buildings                                                                                63,787
        Vehicles                                                                                 25,480
        Land                                                                                     26,303
                                                                                           ------------

                                                                                             12,633,216

        Less accumulated depreciation                                                         3,622,292
                                                                                           ------------
                                                                                           $  9,010,924
                                                                                           ============
</TABLE>

4.      INCENTIVE COMPENSATION

        The Board of Directors of the Company unanimously approved a stock
        option program with a key employee. Pursuant to this plan, the Company
        issued the option to purchase 1,000 shares at a price of $29,240 on an
        annual basis on the first working day of 1997, 1998, 1999 and 2000, for
        a total of 4,000 shares at a price of $116,960. The individual exercised
        the option for the first 1,000 shares earned pursuant to this plan on
        January 2, 1997, by executing a note in favor of the Company in the
        amount of $29,240. The individual was granted an extension on the
        exercise of the second 1,000 share option until immediately prior to the
        closing of the sale of the Company (Note 11) and was also granted an
        acceleration on the exercise of the final 2,000 shares. On February 6,
        1998, the individual exercised the option for the 3,000 shares for
        $87,720.


                                       8
<PAGE>   10




        On April 21, 1997, the Board of Directors of the Company unanimously
        approved a stock option program for certain other key employees.
        Pursuant to this plan, the Company issued the option to purchase shares
        in accordance with the following exercise intervals:

<TABLE>
<CAPTION>

                     Number of          Exercise
                      shares             price              Not Before               Not After
                     ---------        ------------        --------------          --------------
<S>                                   <C>                 <C>                     <C> 
                           250        $      8,405        April 30, 1998          April 30, 2007
                           250               8,405        April 30, 1999          April 30, 2007
                           250               8,405        April 30, 2000          April 30, 2007
                           250               8,405        April 30, 2001          April 30, 2007
                     ---------        ------------

                         1,000        $     33,620
                     =========        ============
</TABLE>


        All of these options were exercised on February 6, 1998 in conjunction
        with the sale of the Company (Note 11).

        The Company applies APB 25 and related interpretations in accounting for
        its stock options, and accordingly, $70,000 of compensation cost was
        recognized during 1997. Had compensation cost for the stock options been
        determined based on the fair value at the grant date consistent with the
        method of SFAS 123, approximately $45,000 in gross compensation costs
        would have been recognized in the year ended December 31, 1997.
        Accordingly, the Company's net income for 1997 would have been increased
        to the pro forma amounts indicated below:

<TABLE>

<S>                                                   <C>
        As reported                                   $   3,928,969
        Pro forma                                     $   3,953,969
</TABLE>


        The weighted average fair value at date of grant for options granted
        during 1997 was $180.34 per option. The fair value of each option grant
        is estimated using the Black-Shoales option-pricing model with the
        following weighted-average assumptions used:
<TABLE>

<S>                                                                                                  <C>
        Dividend yield                                                                               0%
        Expected volatility                                                                          1%
        Risk-free rate of return                                                                  6.00%
        Expected life                                                                         7.5 years
</TABLE>


        In addition to the stock option plans, the Company has a bonus pool for
        the benefit of the same individuals. The bonus pool is determined based
        upon a formula and is approved annually by the Board of Directors. At
        December 31, 1997, the Company accrued approximately $403,000 relative
        to the bonus pool. Such amounts were paid subsequent to year-end.


5.      TREASURY STOCK

        Treasury shares are accounted for under the cost method whereby the
        shares are stated at average cost.

        The Company sold 1,600 treasury shares (including 1,000 shares pursuant
        to a stock option program) on January 1, 1997 for $56,496 to two key
        employees.



                                       9
<PAGE>   11



6.      NOTE PAYABLE

        The Company has a revolving credit agreement with a bank. The maximum
        borrowings pursuant to the agreement are $2,000,000, and bear interest
        at prime plus 1% per annum or 9.5% at December 31, 1997. Borrowings are
        secured by a certain drilling rig and related equipment and are payable
        on demand or on April 30, 1998. At December 31, 1997, the Company had
        outstanding borrowings of $1,800,000 which were subsequently paid in
        full by Patterson Onshore Drilling Company in conjunction with its
        merger with the Company on February 6, 1998 (Note 11).


7.      COMMITMENTS AND CONTINGENCIES

        The Company leases office space and automobiles under non-cancelable
        operating leases. Rent expense was $220,067 for operating leases.

        Scheduled future minimum rental payments under non-cancelable operating
        leases at December 31, 1997 are approximately as follows:
<TABLE>
<CAPTION>

        Years ending
        December 31,
        ------------

<S>                                                                                        <C>         
               1998                                                                        $     60,000
               1999                                                                              49,000
                                                                                           ------------

                                                                                           $    109,000
                                                                                           ============
</TABLE>

        On July 22, 1997, the Salary Contingency Plan Committee of the Board of
        Directors unanimously approved a Stay Bonus and Salary Contingency Plan
        for the Company. The plan provides for a designated group of employees
        to receive a bonus equal to two months of their respective gross salary
        on March 31, 1998, the stay bonus date. Included in accrued expenses at
        December 31, 1997 is management's estimate of the bonus accrual totaling
        $64,000.


8.      DIVIDENDS

        The Board of Directors of the Company has unanimously voted to establish
        a policy of declaring and paying dividends quarterly, at a rate of
        approximately 40% of net income for the previous quarter. This policy
        took effect with the first quarter of 1991.

        The following table summarizes dividends declared by the Board of
        Directors of the Company and paid in 1997:
<TABLE>
<CAPTION>

                                                                                           Amount
               Declaration date           Record date              Payment date           per share
              -----------------       -----------------         -----------------         ---------

<S>                                   <C>                       <C>                       <C>
              February 19, 1997       February 19, 1997         April 15, 1997             $2.50
              July 17, 1997           July 17, 1997             October 10, 1997           $2.50
              October 15, 1997        October 15, 1997          November 21, 1997          $3.00

</TABLE>


                                       10
<PAGE>   12



9.      RETIREMENT PLAN

        The Company has a defined contribution plan (the Plan) which is
        available to all employees meeting certain eligibility requirements.
        Participants may contribute up to 20% of their eligible compensation to
        the Plan. The Company makes matching contributions at the discretion of
        the Board of Directors. The Company's matching contribution of
        approximately $85,000 was paid throughout 1997, with the final $24,000
        being paid subsequent to year-end.


10.     WORKERS' COMPENSATION INSURANCE

        The Company accrued $580,000 at December 31, 1997 for returns from
        retrospective adjustments to previously paid workers' compensation
        insurance premiums. These amounts represent the insurance carrier's best
        estimate of the retrospective return as of December 31, 1997 and are
        reflected as a reduction in direct drilling costs.


11.     SUBSEQUENT EVENT

        On February 6, 1998 the Company was merged into Patterson Onshore
        Drilling Company, a wholly-owned subsidiary of Patterson Energy, Inc.,
        in consideration for $40 million. The separate existence of the Company
        ceased on such date.


                                       11
<PAGE>   13

ITEM 7.   FINANCIAL STATEMENTS AND EXHIBITS.

     (b) Pro forma financial information.

   
      Unaudited pro forma financial information as of December 31, 1997 and for
the year then ended is provided below. The unaudited pro forma financial
information reflects adjustments necessary to give effect to the merger on
February 6, 1998 of Patterson Drilling Company (the "Company"), a wholly-owned
subsidiary of Patterson Energy, Inc., and Robertson Onshore Drilling Company
("Robertson"). The unaudited pro forma balance sheet as of December 31, 1997
assumes the acquisition was completed at December 31, 1997 and the unaudited pro
forma statement of income assumes the acquisition was completed on January 1,
1997. The pro forma adjustments are based upon available information and certain
assumptions the Company believes are reasonable. The unaudited pro forma
financial information is not necessarily indicative of operating results that
would have occurred had the acquisition been consummated on January 1, 1997, nor
is it indicative of future operating results of the combined companies.
    


                             PATTERSON ENERGY, INC.
                   PRO FORMA CONDENSED COMBINED BALANCE SHEET
                                DECEMBER 31, 1997

                                   (Unaudited)
                                 (in thousands)

                                     ASSETS

   
<TABLE>
<CAPTION>
                                                     Historical Financial
                                                         Statements
                                              ----------------------------------                          Pro Forma
                                               Patterson       Robertson Onshore          Pro Forma       Financial
                                              Energy, Inc.     Drilling Company          Adjustments      Statements
                                              -----------      -----------------         -----------      ----------
<S>                                             <C>                  <C>             <C>                    <C>
Current assets:
Cash and cash equivalents ..................     $ 23,338            $    528           $ (5,650)(b)(d)      $ 18,216
   Marketable securities ...................          566                  --                 --                  566
   Accounts receivable:
      Trade ................................       44,732               5,514                 --               50,246
      Oil and natural gas sales ............          773                  --                 --                  773
      Other ................................           --                 625                 --                  625
   Costs of uncompleted drilling contracts       
      in excess of related billings ........           --                 838                 --                  838
   Deferred income taxes ...................        2,309                  --                 --                2,309
   Undeveloped oil and natural gas 
      properties held for resale............        4,781                  --                 --                4,781
   Other current assets.....................          515                 353                 --                  868
                                                 --------            --------           --------             --------
         Total current assets ..............       77,014               7,858             (5,650)              79,222
   Property and equipment, at cost, net ....      100,405               9,011             21,505 (a)          130,921
   Intangible assets, net ..................       24,644                  --              9,393 (a)           34,037
   Other assets.............................        1,137                  14                 --                1,151
                                                 --------            --------           --------             --------
         Total assets ......................     $203,200            $ 16,883           $ 25,248             $245,331
                                                 ========            ========           ========             ========
</TABLE>
    


The accompanying notes are an integral part of these unaudited condensed
combined financial statements.
                                  (continued)



                                      12

<PAGE>   14

ITEM 7.  FINANCIAL STATEMENTS AND EXHIBITS.  (CONTINUED)

     (b) Pro forma financial information.

                             PATTERSON ENERGY, INC.
             PRO FORMA CONDENSED COMBINED BALANCE SHEET - CONTINUED
                                December 31, 1997

                                   (Unaudited)
                                 (in thousands)


                      LIABILITIES AND STOCKHOLDERS' EQUITY

   
<TABLE>
<CAPTION>
                                                           Historical Financial
                                                               Statements
                                                     ----------------------------------                          Pro Forma
                                                      Patterson       Robertson Onshore          Pro Forma       Financial
                                                     Energy, Inc.     Drilling Company          Adjustments      Statements
                                                     -----------      -----------------         -----------      ----------
<S>                                                  <C>                   <C>                 <C>                <C>
Current liabilities:
   Current maturities of notes payable...........    $    1,467            $   1,800            $  (1,800)(d)      $   1,467
   Accounts payable:
     Trade ......................................        12,126                3,089                   --             15,215
     Revenue distribution .......................         3,352                   --                   --              3,352
     Other ......................................         1,569                   --                   --              1,569
   Accrued expenses .............................         5,142                2,131                   --              7,273
   Accrued state and federal income
      taxes payable .............................         6,874                  161                   --              7,035
                                                      ---------            ---------            ---------          ---------
         Total current liabilities ..............        30,530                7,181               (1,800)            35,911
                                                      ---------            ---------            ---------          ---------
Deferred income taxes, net ......................         3,268                   --                   --              3,268

Deferred liabilities ............................           687                   --                   --                687
Notes payable, less current maturities ..........        21,783                   --               36,750 (b)         58,533
                                                      ---------            ---------            ---------          ---------
                                                         25,738                   --               36,750             62,488
                                                      ---------            ---------            ---------          ---------

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 30,967,084 issued
     and outstanding at December 31, 1997 .......           310                  169                 (169)               310
   Additional paid-in capital ...................       102,306                2,312               (2,312)           102,306
   Retained earnings ............................        44,316                7,332               (7,332)            44,316
   Treasury Stock ...............................            --                 (111)                 111                 --
                                                      ---------            ---------            ---------          ---------
         Total stockholders' equity .............       146,932                9,702               (9,702)(a)        146,932
                                                      ---------            ---------            ---------          ---------
         Total liabilities and stockholders'
              equity.............................     $ 203,200            $  16,883            $  25,248          $ 245,331
                                                      =========            =========            =========          =========
</TABLE>
    

The accompanying notes are an integral part of these unaudited condensed
combined financial statements.


                                       13
<PAGE>   15

ITEM 7.  FINANCIAL STATEMENTS AND EXHIBITS.  (CONTINUED)

     (b) Pro forma financial information.

                             PATTERSON ENERGY, INC.
                PRO FORMA CONDENSED COMBINED STATEMENT OF INCOME
                      FOR THE YEAR ENDED DECEMBER 31, 1997
                                   (Unaudited)
                      (in thousands, except per share data)



   
<TABLE>
<CAPTION>                                      
                                               Historical Financial
                                                     Statements
                                         ------------------------------------
                                               Patterson           Robertson                                    Pro Forma
                                             Energy, Inc.      Onshore Drilling                                 Financial
                                                                   Company           Pro Forma Adjustments      Statements
                                         ----------------     ---------------        ---------------------      ----------
<S>                                              <C>              <C>                      <C>                 <C>
Operating revenues:                                                                
    Drilling ...............................     $ 178,332         $  38,332                $      --            $ 216,664
    Oil and natural gas sales ..............        10,773                --                       --               10,773
    Well operation fees ....................         1,632                --                       --                1,632
    Other ..................................            40                --                       --                   40
                                                 ---------         ---------                ---------            ---------
                                                   190,777            38,332                       --              229,109
                                                 ---------         ---------                ---------            ---------
Operating costs and expenses:                                                      
    Direct drilling costs ..................       128,416            29,201                       --              157,617
    Lease operating and production .........         2,274                --                       --                2,274
    Impairment of oil and natural gas                                              
        properties .........................           355                --                       --                  355
    Exploration costs ......................           647                --                       --                  647
    Dry holes and abandonments .............         1,481                --                       --                1,481
    Depreciation, depletion and                                                    
        amortization .......................        17,497             1,226                    2,939(c)            21,662
    General and administrative .............         6,786             3,626                       --               10,412
                                                 ---------         ---------                ---------            ---------
                                                   157,456            34,053                    2,939              194,448
                                                 ---------         ---------                ---------            ---------
Operating income ...........................        33,321             4,279                    2,939               34,661
                                                 ---------         ---------                ---------            ---------
Other income (expense):                                                            
    Net gain (loss) on sale of assets ......         1,499               (58)                      --                1,441
    Interest income ........................         1,056                28                       --                1,084
    Interest expense .......................        (1,045)             (110)                  (2,936)(c)           (4,091)
    Other ..................................           277                23                       --                  300
                                                 ---------         ---------                ---------            ---------
                                                     1,787              (117)                  (2,936)              (1,266)
                                                 ---------         ---------                ---------            ---------
Income before income taxes .................        35,108             4,162                   (5,875)              33,395
                                                 ---------         ---------                ---------            ---------
Income tax expense (benefit):                                                      
    Current ................................        10,354               233                     (860)(c)            9,727
    Deferred ...............................         2,512                --                       --                2,512
                                                 ---------         ---------                ---------            ---------
                                                    12,866               233                     (860)              12,239
                                                 ---------         ---------                ---------            ---------
Net income..................................     $  22,242         $   3,929                $  (5,015)           $  21,156
                                                 =========         =========                =========            =========
                                                                                   
                                                                  
Net income per common share:
    Basic...................................     $    0.78                                                       $    0.74
                                                 =========                                                       =========
    Diluted.................................     $    0.75                                                       $    0.72
                                                 =========                                                       =========
Weighted average number of common 
    shares outstanding:
    Basic ..................................        28,492                                                          28,492
                                                 =========                                                       =========
    Diluted ................................        29,505                                                          29,505
                                                 =========                                                       =========
</TABLE>
    

The accompanying notes are an integral part of these unaudited condensed
combined financial statements.


                                       14
<PAGE>   16

                             PATTERSON ENERGY, INC.
                NOTES TO CONDENSED COMBINED FINANCIAL STATEMENTS


1.       BASIS OF PRESENTATION

   
         On February 6, 1998, the Company consummated a merger with Robertson
Onshore Drilling Company ("Robertson"), a privately-held, non-affiliated
company based in Dallas, Texas, in consideration for $40.6 million. The
purchase price includes an estimate of $600,000 for costs incurred by the
Company relating to the merger. The acquisition was funded using $3.25 million
of the Company's cash on hand and $36.75 million provided by its line of
credit. The assets acquired consist of 15 operable drilling rigs and a shop and
yard located in Liberty City, Texas.
    

         The unaudited pro forma financial information reflects adjustments
necessary to give effect to the merger on February 6, 1998, as described above.
The unaudited pro forma balance sheet as of December 31, 1997 assumes the
acquisition was completed at December 31, 1997 and the unaudited pro forma
statement of income assumes the acquisition was completed on January 1, 1997.

   
         The pro forma adjustments are based upon available information and
certain assumptions the Company believes are reasonable. The unaudited pro forma
financial information is not necessarily indicative of operating results that
would have occurred had the acquisition been consummated on January 1, 1997, nor
is it indicative of future operating results of the combined companies.
    

         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 and
weighted average number of common shares outstanding presented herein reflects
the effects of such stock splits.

2.        PERIOD PRESENTED

         The unaudited pro forma balance sheet and statement of income as of
December 31, 1997 and for the year then ended was prepared using the audited
consolidated financial statements as of and for the year ended December 31, 1997
of Patterson Energy, Inc., as reported under Form 10-K, and the audited
financial statements as of and for the year ended December 31, 1997 of Robertson
Onshore Drilling Company, as filed herewith as Item 7. (a) of this report.


3.        PRO FORMA ADJUSTMENTS

   
         a. The following pro forma adjustment reflects the allocation, based on
the estimated fair values, of the purchase price of approximately $40.6 million,
as well as the elimination of the related book values of the assets acquired (in
thousands):
    

   
<TABLE>
<CAPTION>
                                                   ALLOCATION OF                CARRYING
           ACCOUNT DESCRIPTION                     PURCHASE PRICE                VALUE               ADJUSTMENT
           -------------------                     --------------                -----               ----------
<S>                                                  <C>                       <C>                 <C>
Property and equipment...................             $  30,516                 $  9,011             $  21,505
Goodwill.................................                 9,393                       --                 9,393
Other assets acquired ...................                 7,872                    7,872                    --
Liabilities assumed .....................                (7,181)                  (7,181)                   --
Net assets acquired .....................                    --                    9,702                (9,702)
</TABLE>
    

         The purchase price allocation as detailed above is preliminary in 
nature and subject to change.


                                  (continued)

                                       15
<PAGE>   17

                             PATTERSON ENERGY, INC.
          NOTES TO CONDENSED COMBINED FINANCIAL STATEMENTS - CONTINUED


3.       PRO FORMA ADJUSTMENTS - (continued)

         b. The following pro forma adjustment reflects the related funding of
the acquisition discussed above (in thousands):

<TABLE>
<CAPTION>
                    ACCOUNT DESCRIPTION                         ADJUSTMENT
                    -------------------                         ----------
        <S>                                                    <C>
         Cash and cash equivalents................              $     3,850
         Draw down on line of credit..............                   36,750
</TABLE>


         c. Depreciation and amortization expense, interest expense and income
tax expense were adjusted to reflect the effects of the merger. Depreciation
expense was determined on a straight line basis using depreciable lives
consistent with those historically used by the Company. Amortization expense was
determined on a straight line basis over fifteen years. The related expense
accounts were adjusted as follows (in thousands):

   
<TABLE>
<CAPTION>
                                                              YEAR ENDED
                    ACCOUNT DESCRIPTION                   DECEMBER 31, 1997
                    -------------------                   -----------------
         <S>                                                  <C>
         Depreciation expense.....................            $  2,313
         Amortization expense.....................                 626
         Interest expense.........................               2,936
         Income tax benefit.......................                 860 
</TABLE>
    


   
         d. Restrictive debt covenants of the Company do not permit the Company
to maintain indebtedness with any other financial institution. As a means to
remain in compliance with such restrictions, the Company, using cash on hand,
extinguished all amounts then outstanding under Robertson's loan agreement
resulting in a $1.8 million reduction in cash and notes payable.
    




                                       16
<PAGE>   18

                                    SIGNATURE

         Pursuant to the requirements of the Securities Exchange Act of 1934,
the Registrant has duly caused this report to be signed on its behalf by the
undersigned thereunto duly authorized.


                                    PATTERSON ENERGY, INC.


Date:  April 20, 1998               /s/ JAMES C. BROWN
                                    ---------------------------------
                                    James C. Brown
                                    Vice President-Finance








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