COSTILLA ENERGY INC
8-K/A, 1997-11-12
CRUDE PETROLEUM & NATURAL GAS
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<PAGE>

- -------------------------------------------------------------------------------
                                       
                      SECURITIES AND EXCHANGE COMMISSION
                            WASHINGTON, D.C. 20549

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

                                  FORM 8-K/A

                              (AMENDMENT NO. 1)


                                CURRENT REPORT


    PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934


                                August 28, 1997
                      (Date of earliest event reported)


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


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


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


          DELAWARE                         0-21411                75-2658940
(State or other jurisdiction of    (Commission File Number)   (I.R.S. Employer
 incorporation or organization)                              Identification No.)

     400 WEST ILLINOIS, SUITE 1000
            MIDLAND, TEXAS                                              79701
(Address of principal executive offices)                              (Zip code)
                                       
                                (915) 683-3092
             (Registrant's telephone number, including area code)

                                Not applicable
              (Former name, former address and former fiscal year, 
                        if changed since last report)


- -------------------------------------------------------------------------------
<PAGE>
                                       
                             COSTILLA ENERGY, INC.

                                   FORM 8-K/A

                               TABLE OF CONTENTS


                                                                           PAGE
                                                                           ----

ITEM 7.  Financial Statements & Exhibits

    (a)  Financial Statements of the Ballard Acquisition

         Independent Auditors' Report                                        3

         Statements of Revenues and Direct Operating Expenses for the year
          ended December 31, 1996 and for the six months ended
          June 30, 1997 and 1996 (unaudited)                                 4

         Notes to the Statements of Revenues and Direct Operating Expenses   5

    (b)  Pro Forma Financial Information

         Preliminary Statement                                               7

         Unaudited Pro Forma Condensed Statement of Operations for
          the year ended December 31, 1996                                   8

         Unaudited Pro Forma Condensed Statement of Operations for
          the nine months ended September 30, 1997                           9

         Notes to Unaudited Pro Forma Condensed Financial Statements        10


Signatures                                                                  13


                                       2
<PAGE>

ITEM 7.  FINANCIAL STATEMENTS AND EXHIBITS




                                       
                         INDEPENDENT AUDITORS' REPORT



The Board of Directors and Stockholders
Costilla Energy, Inc.:


We have audited the accompanying statement of revenues and direct operating 
expenses of the Ballard Acquisition (see Note 1) for the year ended December 
31, 1996.  The statement is the responsibility of the Company's management.  
Our responsibility is to express an opinion on the statement 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 statement of revenues and 
direct operating expenses is 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 statement presentation.  We believe that 
our audit provides a reasonable basis for our opinion.

The accompanying statement of revenues and direct operating expenses was 
prepared for the purpose of complying with the rules and regulations of the 
Securities and Exchange Commission (for inclusion in Form 8-K of Costilla 
Energy, Inc. as described in Note 1) and is not intended to be a complete 
presentation of the Ballard Acquisition interests' revenues and expenses.

In our opinion, the statement of revenues and direct operating expenses 
referred to above presents fairly, in all material respects, the revenues and 
direct operating expenses of the Ballard Acquisition for the year ended 
December 31, 1996 in conformity with generally accepted accounting principles.




                                        KPMG PEAT MARWICK LLP

Midland, Texas
November 7, 1997




                                       3
<PAGE>
                                       
                             COSTILLA ENERGY, INC.

                              BALLARD ACQUISITION

              STATEMENTS OF REVENUES AND DIRECT OPERATING EXPENSES

                                (IN THOUSANDS)

                                                          (Unaudited)
                                                        Six months ended
                                       Year ended           June 30,
                                      December 31,     ------------------
                                          1996          1997        1996
                                          ----          ----        ----
Revenues:
    Oil and condensate                  $ 9,833        $4,553      $4,540 
    Natural gas                           1,481         1,571         853 
                                        -------        ------      ------
                                         11,314         6,124       5,393 
                                        -------        ------      ------

Direct operating expenses:
    Lease operating                       2,453         1,465       1,099 
    Workovers                               417           290         406 
    Production taxes                        732           402         325 
                                        -------        ------      ------
                                          3,602         2,157       1,830 
                                        -------        ------      ------

Revenues in excess of direct 
    operating expenses                  $ 7,712        $3,967      $3,563 
                                        -------        ------      ------
                                        -------        ------      ------

                   See the accompanying notes to these statements.


                                       4
<PAGE>

NOTES TO THE STATEMENTS OF REVENUES AND DIRECT OPERATING EXPENSES


(1) BASIS OF PRESENTATION

    On August 28, 1997 Costilla Energy, Inc., (the "Company") acquired from 
Ballard Petroleum, LLC certain oil and gas properties (the "Ballard 
Acquisition") for approximately $41.2 million.  The accompanying statements 
of revenues and direct operating expenses for the Ballard Acquisition do not 
include general and administrative expenses, interest income or expense, a 
provision for depreciation, depletion and amortization, or any provision for 
income taxes since historical expenses of this nature incurred by Ballard are 
not necessarily indicative of the costs to be incurred by the Company.

    Historical financial information reflecting financial position, results 
of operations, and cash flows of the Ballard Acquisition were not available 
and are not presented because the purchase price was assigned to the oil and 
gas property interests acquired. Other assets acquired and liabilities 
assumed were not material.  Accordingly, the historical statements of 
revenues and direct operating expenses of the Ballard Acquisition are 
presented in lieu of the financial statements required under Rule 3-05 of 
Securities and Exchange Commission Regulation S-X.

    Revenues in the accompanying statements of revenues and direct operating 
expenses are recognized on the sales method.  Under this method, revenues are 
recognized based on actual volumes of oil and natural gas sold to purchasers. 
Direct operating expenses are recognized on the accrual method.

    Preparation of the accompanying statements of revenues and direct 
operating expenses requires management to make estimates and assumptions that 
affect the reported amounts of revenues and direct operating expenses during 
the reporting period.  Actual results could differ from those estimates.

INTERIM STATEMENTS OF REVENUES AND DIRECT OPERATING EXPENSES

    The interim financial information for the periods ended June 30, 1997 and 
1996, is unaudited.  However, in the opinion of management, the interim 
statements of revenues and direct operating expenses include all the 
necessary adjustments to fairly present the results of the interim periods 
and all such adjustments are of a normal recurring nature.  The interim 
statements of revenues and direct operating expenses should be read in 
conjunction with the audited statement of revenues and direct operating 
expenses for the year ended December 31, 1996.

(2) SUPPLEMENTARY FINANCIAL INFORMATION FOR OIL AND GAS PRODUCING ACTIVITIES
    (UNAUDITED)

ESTIMATED QUANTITIES OF PROVED OIL AND GAS RESERVES

    Reserve information presented below for the Ballard Acquisition, as of 
January 1, 1996 and December 31,1996, is based on reserve estimates prepared 
by the Company's engineers, using prices and costs in effect at that date.  
Changes in reserve estimates were derived by adjusting such quantities and 
values for actual production using historical prices and costs.

    Proved reserves are estimated quantities of crude oil and natural gas 
which geological and engineering data demonstrate with reasonable certainty 
to be recoverable in future years from known reservoirs under existing 
economic and operating conditions.  Proved developed reserves are those which 
are expected to be recovered through existing wells with existing equipment 
and operating methods.  Oil and gas reserve quantity estimates are subject to 
numerous uncertainties inherent in the estimation of quantities of proved 
reserves and in the projection of future rates of production and the timing 
of development expenditures.  The accuracy of such estimates is a function of 
the quality of available data and of engineering and geological 
interpretation and judgment. Results of subsequent drilling, testing and 
production may cause either upward or downward revision of previous 
estimates.  Further, the volumes considered to be commercially recoverable 
fluctuate with changes in prices and operating costs.  The Company emphasizes 
that reserve estimates are inherently imprecise and that estimates of new 
discoveries are more imprecise than those of currently producing oil and gas 
properties.  Accordingly, these reserve estimates are expected to change as 
additional information becomes available in the future.

                                       5
<PAGE>

    Below are the net estimated quantities of proved reserves and proved
developed reserves for the Ballard Acquisition.

                                                            Oil         Gas
                                                          (MBbls)      (Mmcf)
                                                          -------      ------
Proved reserves at January 1, 1996                         4,746       10,529
Extensions and discoveries                                    18        2,457
Production                                                  (510)        (651)
                                                           -----       ------
Proved reserves at December 31, 1996                       4,254       12,335
                                                           -----       ------
                                                           -----       ------
Proved developed reserves at December 31, 1996             4,138        9,878
                                                           -----       ------
                                                           -----       ------

STANDARDIZED MEASURE OF DISCOUNTED FUTURE NET CASH FLOWS OF PROVED OIL AND GAS
RESERVES

    The Company has estimated the standardized measure of discounted future net
cash flows and changes therein relating to proved oil and gas reserves in
accordance with the standards established by the Financial Accounting Standards
Board through its Statement No. 69.  The estimates of future cash flows and
future production and development costs are based on year-end sales prices for
oil and gas, estimated future production of proved reserves, and estimated
future production and development costs of proved reserves, based on current
costs and economic conditions.  The estimated future net cash flows are then
discounted at a rate of 10%.

    Discounted future net cash flow estimates like those shown below are not
intended to represent estimates of the fair market value of oil and gas
properties.  Estimates of fair market value should also consider probable
reserves, anticipated future oil and gas prices, interest rates, changes in
development and production costs and risks associated with future production.
Because of these and other considerations, any estimate of fair market value is
necessarily subjective and imprecise.

    The following are the Company's estimated standardized measure of 
discounted future net cash flows from proved reserves attributable to the 
Ballard Acquisition as of December 31, 1996 (in thousands):

    Future:

         Cash inflows                                  $143,236
         Production costs                               (46,312)
         Development costs                                 (871)
                                                       --------
           Net cash flows before income taxes            96,053
    10% annual discount for estimated timing of
     cash flows                                         (34,735)
                                                       --------
    Standardized measure of discounted future net
     cash flows before income taxes                    $ 61,318
                                                       --------
                                                       --------

    The following are the sources of changes in the standardized measure of
discounted net cash flows for the year ended December 31, 1996 (in thousands):

    Standardized measure, January 1, 1996               $32,538
    Extensions and discoveries, net of development
     costs                                                5,452
    Sales, net of production costs                       (7,712)
    Net change in prices                                 29,762
    Accretion of discount                                 3,254
    Other                                                (1,976)
                                                        -------
    Standardized measure, December 31, 1996             $61,318
                                                        -------
                                                        -------

                                     6
<PAGE>

ITEM 7(a)   PRO FORMA FINANCIAL INFORMATION

PRO FORMA CONDENSED FINANCIAL STATEMENTS

    The unaudited Pro Forma Condensed Statements of Operations of the Company
have been prepared to give effect to the Company's Corporate Reorganization on
October 8, 1996, the Common Stock Offering of 4,800,000 shares of its Common
Stock on October 8, 1996, the Notes Offering on October 8, 1996 in which the
Company issued $100 million aggregate principal amount of 10.25% Senior notes
due 2006, the issuance of an additional 475,000 shares of its Common Stock on
November 1, 1996 pursuant to the exercise of the over-allotment option by its
underwriters, the 1996 Acquisition and the Ballard Acquisition as if such
transactions had taken place on January 1, 1996.  The Pro Forma Condensed
Statements of Operations of the Company are not necessarily indicative of the
results for the periods presented had the Ballard Acquisition and the 1996
Acquisition taken place on January 1, 1996.  In addition, future results may
vary significantly from the results reflected in the accompanying Pro Forma
Condensed Statements of Operations because of normal production declines,
changes in product prices, and the success of future exploration and development
activities, among other factors. This information should be read in conjunction
with the Consolidated Financial Statements of Costilla Energy, Inc. and the
Statements of Revenues and Direct Operating Expenses with respect to the
properties acquired in the Ballard Acquisition.

                                     7

<PAGE>

                             COSTILLA ENERGY, INC.

           PRO FORMA CONDENSED STATEMENT OF OPERATIONS -- UNAUDITED

                             YEAR DECEMBER 31, 1996

                      (IN THOUSANDS, EXCEPT PER SHARE DATA)

<TABLE>
                                                                                             PRO FORMA
                                         COSTILLA       1996        BALLARD     PRO FORMA     COSTILLA
                                       ENERGY, INC.  ACQUISITION  ACQUISITION  ADJUSTMENTS  ENERGY, INC.
                                       ------------  -----------  -----------  -----------  ------------
<S>                                    <C>           <C>          <C>          <C>          <C>
Revenues                                 $55,026        $9,223      $11,314                   $75,563

Expenses:
  Oil and gas production                  21,774         5,167        3,602      (225)(1)     30,318
  General and administrative               5,238                                 (129)(1)      7,220
                                                                                  431 (2)
                                                                                1,680 (3)
  Exploration and abandonments             2,550           247                    300 (4)      3,097
  Depreciation, depletion and
   amortization                           12,430                                   75 (1)     17,473
                                                                                4,968 (5)
  Interest                                11,281                                5,271 (6)     15,906
                                                                                 (646)(7)
                                         -------        ------      -------                  -------
                                          53,273         5,414        3,602                   74,014
                                         -------        ------      -------                  -------
Net income (loss) before    
 federal income taxes                      1,753         3,809        7,712                    1,549

Provision for federal income taxes
  Current                                    176                                                 176
  Deferred                                 1,042                                 (676)(8)        366
                                         -------        ------      -------                  -------
Net income (loss)                        $   535        $3,809      $ 7,712                  $ 1,007
                                         -------        ------      -------                  -------
                                         -------        ------      -------                  -------
Net income (loss) per share              $  0.08                                             $  0.10
                                         -------                                             -------
                                         -------                                             -------
Weighted average shares outstanding        6,473                                4,003 (9)     10,476
                                         -------                                             -------
                                         -------                                             -------
</TABLE>

 See accompanying notes to unaudited pro forma condensed financial statements.

                                     8

<PAGE>

                             COSTILLA ENERGY, INC.

            PRO FORMA CONDENSED STATEMENT OF OPERATIONS - UNAUDITED

                      NINE MONTHS ENDED SEPTEMBER 30, 1997

                      (IN THOUSANDS, EXCEPT PER SHARE DATA)

<TABLE>
                                                                          PRE OFFERING
                                    COSTILLA      BALLARD     PRO FORMA     COSTILLA
                                  ENERGY, INC.  ACQUISITION  ADJUSTMENTS  ENERGY, INC.
                                  ------------  -----------  -----------  ------------
<S>                               <C>           <C>          <C>          <C>
Revenues                            $55,113        $5,688                    $60,801

Expenses:
  Oil and gas production             21,038         2,603                     23,641
  General and administrative          5,543                   1,120 (1)        6,663
  Exploration and abandonments        3,748                     200 (2)        3,948
  Depreciation, depletion and
   amortization                      15,758                   2,030 (3)       17,788

  Interest                            8,856                   1,635 (4)       10,491

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

                                     54,943         2,603                     62,532
                                    -------        ------                    -------

Net income (loss) before federal
 income taxes                           170         3,085                     (1,731)

Provision for federal income taxes      
  Current                                62                                       62
  Deferred                               90                    (758) (8)        (668)
                                    -------        ------                    -------

Net income (loss)                   $    18        $3,085                    $(1,125)
                                    -------        ------                    -------
                                    -------        ------                    -------

Net income (loss) per share         $   -                                    $ (0.11)
                                    -------                                  -------
                                    -------                                  -------

Weighted average shares outstanding  10,425                                   10,425
                                    -------                                  -------
                                    -------                                  -------
</TABLE>

  See accompanying notes to unaudited pro forma condensed financial statements.

                                       9

<PAGE>

                                COSTILLA ENERGY, INC.

             NOTES TO UNAUDITED PRO FORMA CONDENSED FINANCIAL STATEMENTS

NOTE 1. -- BASIS OF PRESENTATION

    The Pro Forma Condensed Statements of Operations of the Company have been
prepared to give effect to the Company's Corporate Reorganization on October 8,
1996, the Common Stock Offering of 4,800,000 shares of its Common Stock on
October 8, 1996, the Notes Offering on October 8, 1996 in which the Company
issued $100 million aggregate principal amount of 10.25% Senior notes due 2006,
the issuance of an additional 475,000 shares of its Common Stock on November 1,
1996 pursuant to the exercise of the over-allotment option by its underwriters,
the 1996 Acquisition and the Ballard Acquisition as if such transactions had
taken place on January 1, 1996.  The Ballard Acquisition and the 1996
Acquisition are accounted for by the purchase method.

    Costilla Energy, Inc. -- Represents the historical consolidated statements
     of operations for the year ended December 31, 1996 and the nine months 
     ended September 30, 1997.

    1996 Acquisition -- Represents the revenues and direct operating  expenses 
     of the properties acquired in the 1996 Acquisition for the period from 
     January 1, 1996 to June 14, 1996 (date of the 1996 Acquisition).

    Ballard Acquisition -- Represents the revenues and direct operating expenses
     of the properties acquired in the Ballard Acquisition for the period from 
     January 1, 1996 to August 28, 1997 (date of the Ballard Acquisition).

NOTE 2. -- PRO FORMA ENTRIES

    (1)   To record the acquisition of Valley Gathering Company and CSL
Management Corporation from certain members of Costilla Energy, LLC and to
record the related additional depreciation and amortization, and reduction in
oil and gas production and general and administrative expenses.

    (2)   Estimated incremental general and administrative expenses necessary to
administer the properties acquired in the 1996 Acquisition and increased public
reporting and administration costs including salary and benefits for one
executive level employee and revised compensation arrangements for the remaining
executives, directors' fees, insurance coverage and estimated costs to
administer shareholder communications.

    (3)   To record the incremental general and administrative expenses 
incurred at a contractual rate of approximately $140,000 per month as a 
result of the Ballard Acquisition.

    (4)   To record the incremental geological and geophysical expenses 
incurred at a contractual rate of approximately $25,000 per month as a result 
of the Ballard Acquisition.

    (5)   To record estimated incremental depletion expense for the properties
acquired in the 1996 Acquisition from January 1, 1996 through June 14, 1996
(date of the 1996 Acquisition) and for the properties acquired in the Ballard
Acquisition from January 1, 1996 through August 28, 1997 (date of the Ballard
Acquisition).

    (6)   To adjust interest expense to reflect additional borrowings for the
properties acquired in the 1996 Acquisition from January 1, 1996 to June 14,
1996 (date of the 1996 Acquisition) and for the properties acquired in the
Ballard Acquisition from January 1, 1996 to August 28, 1997 (date of the Ballard
Acquisition).  Also included is the amortization of loan fees of $478,000 over a
four-year period.

Incremental interest expense includes the following components:


                                      10

<PAGE>
<TABLE>
                                                         Year Ended       Nine Months Ended
                                                      December 31, 1996   September 30, 1997
                                                      -----------------   ------------------
    <S>                                               <C>                 <C>
    Additional interest on borrowings for the 1996
     Acquisition through June 14, 1996                    $     2,400         $         -

    Additional interest on borrowings associated with
     the Ballard Acquisition                                    2,851               1,555

    Amortization of loan fees                                     120                  80
                                                          -----------         ----------- 
                                                          $     5,271         $     1,635
                                                          -----------         ----------- 
                                                          -----------         ----------- 
</TABLE>

    (7)   To reverse interest on the Existing Debt and to adjust interest 
expense to reflect issuance of the Notes at 10.25% plus the amortization of 
estimated debt issuance costs over 10 years ($385,000 annually).

    (8)   Assumes the Company had been a Subchapter C Corporation for federal 
income tax purposes effective January 1, 1996.

    (9)   To reflect the issuance of 5,275,000 shares of Common Stock at an 
estimated price of $12.50 per share for estimated proceeds of $60,800,000, 
net of estimated expenses of the Common Stock Offering.

NOTE 3. -- SUPPLEMENTAL OIL AND GAS RESERVE INFORMATION

    The estimates of proved oil and gas reserves, which are located in the 
United States, were prepared by the Company as of January 1, 1996 and 
December 31, 1996.  Reserves were estimated in accordance with guidelines 
established by the Securities and Exchange Commission and FASB which require 
that reserve estimates be prepared under existing economic and operating 
conditions with no provision for price and cost escalations, except by 
contractual arrangements. The Company has presented the pro forma reserve 
estimates utilizing an oil price of $23.88 per Bbl and a gas price of $3.94 
per Mcf as of December 31, 1996.  The pro forma information assumes that both 
the 1996 Acquisition and the Ballard Acquisition took place on January 1, 1996.

OIL AND GAS PRODUCING ACTIVITIES

    Oil and gas reserve quantity estimates are subject to numerous uncertainties
inherent in the estimation of quantities of proved reserves and in the
projection of future rates of production and the timing of development
expenditures. The accuracy of such estimates is a function of the quality of
available data and of engineering and geological interpretation and judgment.
Results of subsequent drilling, testing and production may cause either upward
or downward revision of previous estimates. Further, the volumes considered to
be commercially recoverable fluctuate with changes in prices and operating
costs. The Company emphasizes that reserve estimates are inherently imprecise
and that estimates of new discoveries are more imprecise that those of currently
producing oil and gas properties. Accordingly, these estimates are expected to
change as additional information becomes available in the future.


                                      11
<PAGE>

                                           OIL AND           NATURAL   
                                      CONDENSATE (MBbls)    GAS (MMcf) 
                                      ------------------    ---------- 

Total Proved Reserves:
Balance January 1, 1996                     20,686            123,173  
  Revisions of previous estimates            1,789              5,321  
  Extensions and discoveries                 1,187             16,038  
  Production                                (2,540)           (11,673) 
  Purchases of minerals-in-place               251                230  
  Sales of minerals-in-place                  (119)              (482) 
                                          --------           -------- 
Balance, December 31, 1996                  21,254            132,607  
                                          --------           -------- 
                                          --------           -------- 
Proved Developed Reserves:
  December 31, 1996                         18,156             99,901 


STANDARDIZED MEASURE OF DISCOUNTED FUTURE NET CASH FLOWS RELATING TO PROVED OIL
AND GAS RESERVES

    The standardized measure of discounted future net cash flows is computed by
applying period-end prices of oil and gas (with consideration of price changes
only to the extent provided by contractual arrangements) to the estimated future
production of proved oil and gas reserves less estimated future expenditures
(based on period-end costs) to be incurred in developing and producing the
proved reserves, less estimated future income tax expenses (based on period-end
statutory tax rates, with consideration of future tax rates already legislated)
to be incurred on pretax net cash flows less tax basis of properties and
available credits, and assuming continuation of existing economic conditions.
The estimated future net cash flows are then discounted using a rate of 10% per
year to reflect the estimated timing of the future cash flows.

    Discounted future cash flow estimates like those shown below are not 
intended to represent estimates of the fair value of oil and gas properties. 
Estimates of fair value should also consider probable reserves, anticipated 
future oil and gas prices, interest rates, changes in development and 
production costs and risks associated with future production. Because of 
these and other considerations, estimates of fair value are necessarily 
subjective and imprecise.

                                                               YEAR ENDED
                                                            DECEMBER 31, 1996
                                                            -----------------
                                                               (THOUSANDS)

              Future cash flows                               $  1,030,336
              Future costs:
                Production                                        (369,601)
                Development                                        (26,340)
                                                              ------------ 
              Future net cash flows before income taxes            634,395
              Future income taxes                                 (178,454)
                                                              ------------ 
              Future net cash flows                                455,941 
                                                              ------------ 
              10% annual discount for estimated timing of 
                cash flows                                        (187,778)
                                                              ------------ 
              Standardized measure of discounted net cash
                flows                                         $    268,163
                                                              ------------ 
                                                              ------------ 

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

    (a) Present value of estimated future net cash flows, before income taxes 
would be approximately $373 million as of December 31, 1996.


                                      12

<PAGE>

CHANGES IN STANDARDIZED MEASURE OF DISCOUNTED FUTURE NET CASH FLOWS FROM PROVED
RESERVES


                                                           YEAR ENDED
                                                        DECEMBER 31, 1996
                                                        ----------------- 
                                                           (THOUSANDS)
          Increase (decrease):
            Purchase of minerals-in-place                  $     2,219
            Extensions and discoveries and improved
             recovery, net of future production and
             development costs                                  37,802
            Accretion of discount                               20,421
            Net change in sales prices net of production
             costs                                             157,162
            Changes in estimated future
             development costs                                   2,674

            Revisions of quantity estimates                     23,878
            Net change in income taxes                         (47,371)
            Sales, net of production costs                     (43,913)
            Sales of minerals in place                          (1,330)
            Changes of production rates (timing) and
             other                                             (30,011)
                                                           ----------- 
             Net increase                                      121,531

            Standardized measure of discounted future
             net cash flows:

               Beginning of period                             146,631
                                                           ----------- 
               End of period                               $   268,162
                                                           ----------- 
                                                           ----------- 



                                      13

<PAGE>

                                 S I G N A T U R E S


    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.


                                       COSTILLA ENERGY, INC.



Date: November 12, 1997                By: /s/ BOBBY W. PAGE
                                          ------------------------------
                                       Bobby W. Page
                                       Senior Vice President
                                       and Chief Financial Officer















                                      14


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