STERLING GAS DRILLING FUND 1981
10-K, 1998-03-25
DRILLING OIL & GAS WELLS
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<PAGE>   1


================================================================================

                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

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


                                    FORM 10-K
(Mark One)
[X]         ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES
                              EXCHANGE ACT OF 1934
                   For the fiscal year ended December 31, 1997
                                       OR
[ ]         TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE
                         SECURITIES EXCHANGE ACT OF 1934
                        For the transition period from to


                           COMMISSION FILE NO. 0-10501

                         STERLING GAS DRILLING FUND 1981
             (Exact name of Registrant as specified in its charter)

            
            NEW YORK                                     13-3098770
(State or other jurisdiction of                       (I.R.S. Employer   
incorporation or organization)                       Identification No.) 
                                                  
                              

         ONE LANDMARK SQUARE                                06901
        STAMFORD, CONNECTICUT                             (Zip Code)
(Address of principal executive offices)

                                                    
                                  

       Registrant's telephone number, including area code: (203) 358-5700

          Securities registered pursuant to Section 12(b) of the Act:
                                      NONE

          Securities registered pursuant to Section 12(g) of the Act:
                          UNITS OF LIMITED PARTNERSHIP
                                (Title of Class)

         Indicate by check mark whether Registrant (1) has filed all reports
required to be filed by Section 13 or 15(d) of the Securities Exchange Act of
1934 during the preceding 12 months (or for such shorter period that the
registrant was required to file such reports), and (2) has been subject to such
filing requirements for the past 90 days. 
                                                               YES  X   NO
                                                                  -----   -----
         Indicate by check mark if disclosure of delinquent filers pursuant to
Item 405 of Regulation S-K is not contained herein, and will not be contained,
to the best of Registrant's knowledge, in definitive proxy or information
statements incorporated by reference in Part III of this Form 10-K or any
amendment to this Form 10-K. [ ]

         The Registrant has no voting stock. There is no market for the Units
and therefore no market value of the Units is reported.

         The number of Units of the Registrant outstanding as of March 16, 1998,
was: 8,790.

                       DOCUMENTS INCORPORATED BY REFERENCE

                                      NONE
================================================================================



<PAGE>   2


                         STERLING GAS DRILLING FUND 1981

                             FORM 10-K ANNUAL REPORT
                            FOR THE FISCAL YEAR ENDED
                                DECEMBER 31, 1997

                                     PART I

ITEM 1.  BUSINESS

         Sterling Gas Drilling Fund 1981 (the "Registrant" or the "Partnership")
is a limited partnership formed under the laws of the State of New York on
September 28, 1981. The sole business of the Partnership was the drilling of
formation extension wells principally for natural gas in various locations in
the State of West Virginia. No exploratory drilling was undertaken.

         The principal place of business of the Partnership is at One Landmark
Square, Stamford, Connecticut 06901, telephone (203) 358-5700. The Managing
General Partner of the Partnership is PrimeEnergy Management Corporation, a New
York corporation, which is a wholly-owned subsidiary of PrimeEnergy Corporation,
a publicly held Delaware corporation. Messrs. Charles E. Drimal, Jr., Oliver J.
Sterling and Samuel R. Campbell also are General Partners. Mr. Drimal is a
Director, President and Chief Executive Officer of PrimeEnergy Management
Corporation and PrimeEnergy Corporation, and Mr. Campbell is a Director of
PrimeEnergy Corporation.

         The aggregate contributions to the Partnership were $8,790,000, all of
which, net of the organization expenses of the Partnership, was expended in the
drilling of such formation extension wells. Such properties are located in Clay,
Roane, Calhoun, and Wirt Counties, West Virginia. The Partnership does not
operate any of the properties in which it has an interest, but generally such
properties are operated and serviced by Prime Operating Company, a Texas
corporation, and Eastern Oil Well Service Company, a West Virginia corporation,
both wholly-owned subsidiaries of PrimeEnergy Corporation.

         During 1997, the Partnership did not engage in any development drilling
activities or the acquisition of any significant additional properties, but
engaged in the production of oil and gas from its producing properties in the
usual and customary course. Since January 1, 1998, and to the date of this
Report, the Partnership has not engaged in any drilling activities nor
participated in the acquisition of any material producing oil and gas
properties.

COMPETITION AND MARKETS

         Competitors of the Partnership in the marketing of its oil and gas
production include oil and gas companies, independent concerns, and individual
producers and operators, many of which have financial resources, staffs and
facilities substantially greater than those available to the Partnership.
Furthermore, domestic producers of oil and gas must not only compete with each
other in marketing their output, but must also compete with producers of
imported oil and gas and alternative energy sources such as coal, nuclear power
and hydro-electric power.



                                       -1-

<PAGE>   3



         The availability of a ready market for any oil and gas produced by the
Partnership at acceptable prices per unit of production will depend upon
numerous factors beyond the control of the Partnership, including the extent of
domestic production and importation of oil and gas, the proximity of the
Partnership's producing properties to gas pipelines and the availability and
capacity of such pipelines, the marketing of other competitive fuels,
fluctuation in demand, governmental regulation of production, refining,
transportation and sales, general national and worldwide economic conditions,
and pricing, use and allocation of oil and gas and their substitute fuels.

         The Partnership does not currently own or lease any bulk storage
facilities or pipelines, other than adjacent to and used in connection with
producing wells. The Partnership deals with a number of major and independent
companies for the purchase of its oil and gas production, in the areas of
production. Sales are made under short-term contractual arrangements or monthly
spot prices. In 1997, approximately $140,000, or 56.33%, and $97,000, or 39.39%,
of the Partnership's gas production was purchased by the Brooklyn Union Gas
Company and Phoenix Diversified, respectively. Neither purchaser has any
relationship or is otherwise affiliated with the Partnership. The Partnership
believes that its current purchasers will continue to purchase oil and gas
products and, if not, could be replaced by other purchasers.

ENVIRONMENTAL MATTERS

         The petroleum industry is subject to numerous federal and state
environmental statutes, regulations and other pollution controls. In general,
the Partnership is, and will be subject to, present and future environmental
statutes and regulations, and in the future the cost of its activities may
materially increase as a result thereof. The Partnership's expenses relating to
preserving the environment during 1997 as they relate to its oil and gas
operations were not significant in relation to operating costs and the
Partnership expects no material change in the near future. The Partnership
believes that environmental regulations should not, in the future, result in a
curtailment of production or otherwise have a materially adverse effect on the
Partnership's operations or financial condition.

REGULATION

         The Partnership's oil and gas operations are subject to a wide variety
of federal, state and local regulations. Administrative agencies in such
jurisdictions may promulgate and enforce rules and regulations relating to,
among other things, drilling and spacing of oil and gas wells, production rates,
prevention of waste, conservation of natural gas and oil, pollution control, and
various other matters, all of which may affect the Partnership's future
operations and production of oil and gas. The Partnership's natural gas
production and prices received for natural gas are regulated by the Federal
Energy Regulatory Commission ("FERC") and the Natural Gas Policy Act of 1978 and
various state regulations. The Partnership was subject to the Crude Oil Windfall
Profit Tax Act of 1980, which imposed an excise tax on producers of crude oil at
various rates for prices received in excess of certain historical base prices.
That Act was repealed in August, 1988. The Partnership is also subject to state
drilling and proration regulations affecting its drilling operations and
production rates.



                                       -2-

<PAGE>   4



     The FERC continues to regulate interstate natural gas pipeline
transportation rates and service conditions pursuant to the NGA and NGPA.
Federal regulation of interstate transporters affects the marketing of natural
gas produced by the Partnership as well as the revenues received by the
Partnership for sales of such natural gas. Since the latter part of 1985,
through its Order Nos. 436, 500 and 636 rulemakings, the FERC has endeavored to
make natural gas transportation accessible to gas buyers and sellers on an open
and non-discriminatory basis. The FERC's efforts have significantly altered the
marketing and pricing of natural gas. No prediction can be made as to what
additional legislation may be proposed, if any, affecting the competitive status
of a gas producer, restricting the prices at which a producer may sell its gas,
or the market demand for gas, nor can it be predicted which proposals, including
those presently under consideration, if enacted, might be effective.

         A number of legislative proposals have been introduced in Congress and
the state legislatures of various states, that, if enacted, would significantly
affect the petroleum industry. Such proposals involve, among other things, the
imposition of land and use controls and certain measures designed to prevent
petroleum companies from acquiring assets in other energy areas. In addition,
there is always the possibility that if market conditions change dramatically in
favor of oil and gas producers that some new form of "windfall profit" or
severance tax may be proposed for and imposed upon either oil or gas. At the
present time it is impossible to predict which proposals, if any, will actually
be enacted by Congress or the various state legislatures. The Partnership
believes that it will comply with all orders and regulations applicable to its
operations. However, in view of the many uncertainties with respect to the
current controls, including their duration and possible modification together
with any new proposals that may be enacted, the Partnership cannot predict the
overall effect, if any, of such controls on its operations.

TAXATION

         The Partnership received an opinion of its counsel that the Partnership
would be classified as a partnership and the holders of Partnership Units would
be treated as limited partners for federal income tax purposes. The Partnership
itself, to the extent that it is treated for federal income tax purposes as a
partnership, is not subject to any federal income taxation, but it is required
to file annual partnership returns. Each holder of Partnership Units will be
allocated his distributive shares of the Partnership's income, gain, profit,
loss, deductions, credits, tax preference items and distributions for any
taxable year of the Partnership ending within or with his taxable year without
regard as to whether such holder has received or will receive any cash
distributions from the Partnership.

ITEM 2.  PROPERTIES

         The Partnership has no interest in any properties other than its oil
and gas properties. The information set forth below summarizes the Partnership's
oil and gas wells, production and reserves, for the periods indicated.



                                       -3-

<PAGE>   5



PRODUCING WELLS AND OPERATING INFORMATION

         The Partnership, following its formation, and in December, 1981,
contracted for the drilling of 41 development wells, which resulted in 37
producing wells, three non-commercial wells and one dry hole.

         As of December 31, 1997, the Partnership had ownership interests in the
following gross and net producing oil and gas wells and gross and net producing
acres.(1) The Partnership has no material undeveloped leasehold, mineral or
royalty acreage.

         Producing wells:
                                                      Gross            Net
                                                      -----            ---
                  Oil Wells.......................       0              0.0
                  Gas Wells.......................      42             32.6

                  Producing acres.................   2,798.75       2,172.39

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

         (1)      A gross well is a well in which an interest is owned; a net
                  well is the sum of the interests owned in gross wells. Wells
                  are classified by their primary product. Some wells produce
                  both oil and gas.

         The following table sets forth the Partnership's oil and gas
production, average sales prices and average production costs as of and for the
periods indicated:

<TABLE>
<CAPTION>
                                                                            YEAR ENDED DECEMBER 31,                      
                                                            --------------------------------------------------------     
                                                            1997          1996         1995         1994        1993     
                                                            ----          ----         ----         ----        ----     
<S>                                                     <C>              <C>          <C>          <C>         <C>       
Production:                                                                                                              
         Oil and Condensate (bbl).................             515          541          416          387          352   
   Gas (Mcf)......................................          85,541       88,693       93,101       84,266      109,638   
Average Price of Sales:                                                                                                  
         Oil and Condensate ($ per bbl)...........      $    18.34        19.50        16.72        13.96        14.11   
         Gas ($ per Mcf)$.........................      $     2.93         2.63         2.66         2.89         2.74   
Production Expense per Dollar                                                                                            
         of Operating Revenue.....................      $     0.40         0.38         0.36         0.45         0.35   
</TABLE>


OIL AND GAS RESERVES

         The Partnership's interests in proved developed oil and gas properties
have been evaluated by Ryder Scott Company for the periods indicated below. All
of the Partnership's


                                       -4-

<PAGE>   6



reserves are located in the continental United States. The following table
summarizes the Partnership's oil and gas reserves at the dates shown (figures
rounded):
<TABLE>
<CAPTION>

                                            Proved Developed
        As of                               ----------------
        12-31                     Oil (bbls)                 Gas (Mcf)
        -----                     ----------                 ---------
        <S>                       <C>                        <C>      
        1993                         2,000                   1,654,000
        1994                         1,000                   1,209,000
        1995                         3,500                   1,453,500
        1996                         3,600                   1,435,000
        1997                         4,690                   1,273,000
</TABLE>


         The estimated future net revenue (using current prices and costs as of
the dates indicated, exclusive of income taxes (at a 10% discount for estimated
timing of cash flow) for the Partnership's proved developed oil and gas reserves
for the periods indicated are summarized as follows (figures rounded):
<TABLE>
<CAPTION>

                                               Proved Developed
                                               ----------------
        As of                          Future Net             Present Value of
        12-31                            Revenue             Future Net Revenue
        -----                          ----------            ------------------
        <S>                            <C>                   <C>       
        1993                           $2,968,000                $1,344,000
        1994                            1,423,000                   703,000
        1995                            1,745,700                   765,500
        1996                            1,893,800                   817,000
        1997                            1,558,300                   687,900
</TABLE>


         Since January 1, 1997, the Partnership has not filed any estimates of
its oil and gas reserves with, nor were any such estimates included in any
reports, to any federal authority or agency, other than the Securities and
Exchange Commission.

ITEM 3.  LEGAL PROCEEDINGS

         The Partnership is not a party to, nor is any of its property the
subject of, any legal proceedings actual or threatened, which would have a
material adverse effect on the business and affairs of the Partnership.

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

         There were no matters submitted during 1997 for vote by the holders of
Partnership Units.




                                       -5-

<PAGE>   7



                                     PART II

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

         There is no market for the Limited Partnership Units (the "Units") of
the Partnership. As of March 16, 1998, there were 690 holders of record of the
Units.

         The Units are not regarded as stock and payments or distributions to
holders of Units are not made in the form of dividends. There were no
distributions to the holders of Units in 1997 or 1996. Aggregate cash
distributions to the holders of the Units as of December 31, 1997, was
$3,955,500.

         The Managing General Partner may purchase Units directly from the unit
holders if presented to the Managing General Partner, subject to conditions,
including limitations on numbers of Units, and at a price to be fixed by the
Managing General Partner in accordance with certain procedures, all as provided
for in the Limited Partnership Agreement of the Partnership.

ITEM 6.  SELECTED FINANCIAL DATA

         The information required hereunder is set forth under "Selected
Financial Data" in the Financial Information section included in this Report.
The index to the Financial Information section is at page F-1.

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

         The information required hereunder is set forth under "Management's
Discussion and Analysis of Financial Condition and Results of Operations" in the
Financial Information section included in this Report. The index to the
Financial Information section is at page F-1.

ITEM 8.  FINANCIAL STATEMENTS AND SUPPLEMENTARY DATA

         The information required hereunder is set forth under "Report of
Independent Public Accountants," "Balance Sheets," "Statements of Operations,"
"Statements of Changes in Partners' Equity," "Statements of Cash Flows" and
"Notes to Financial Statements" in the Financial Information section included in
this Report. The index to the Financial Information section is at page F-1.

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

         There was no disagreement between the Partnership and its certified
public accountants on any matter of accounting principles or practices or
financial statement disclosure.



                                       -6-

<PAGE>   8



                                    PART III

ITEM 10.          DIRECTORS AND EXECUTIVE OFFICERS OF THE REGISTRANT

         The Managing General Partner of the Partnership is PrimeEnergy
Management Corporation, a New York corporation ("Management"). The principal
business of Management is the management of the Partnership and other publicly
and privately held exploration and development limited partnerships and joint
ventures and publicly held asset and income fund limited partnerships. As of
March 16, 1998, Management acts as the Managing General Partner in a total of 51
limited partnerships and joint ventures, of which 5 are publicly held, and is
the Managing Trustee of 2 Delaware Business Trusts. The primary activity of such
Partnerships, joint ventures and trusts is the production of oil and gas and
Management, as the Managing General Partner of the Partnership, will devote such
of its time as it believes necessary in the conduct and management of the
business and affairs of the Partnership. Management, and other of the General
Partners of the Partnership, are engaged in and intend to continue to engage in
the oil and gas business for their own accounts and for the accounts of others.

         Management, which provides all of the executive, management and
administrative functions of the Partnership, is a wholly-owned subsidiary of
PrimeEnergy Corporation ("PrimeEnergy"), a publicly held Delaware corporation.
The principal offices of PrimeEnergy and Management are in Stamford,
Connecticut. The operating subsidiaries of PrimeEnergy, Prime Operating Company
and Eastern Oil Well Service Company, maintain their principal offices in
Houston, Texas, with district offices in Midland, Texas, Oklahoma City,
Oklahoma, and Charleston, West Virginia. PrimeEnergy and its subsidiaries have
about 164 employees, including their principal officers, providing management
and administrative services, accounting, engineers, geologists, production
engineers, land department personnel and field employees.

         Set forth below is information concerning the directors and executive
officers of Management and PrimeEnergy who are involved with the conduct of the
business and operations of the Partnership.

         Charles E. Drimal, Jr., age 49, is a Director and President of
Management and has held those positions since May, 1983. He is also a Director
and President of PrimeEnergy and the operating subsidiaries. He graduated from
the University of Maryland in 1970 and from Samford University School of Law in
1973 and is a member of the New York State Bar.

         Beverly A. Cummings, age 44, has been a Director and Vice President,
Finance, of Management since August, 1985. She is also a Director and Vice
President, Finance, and Treasurer of PrimeEnergy and the operating subsidiaries.
Ms. Cummings is a Certified Public Accountant and holds a Bachelor of Science
degree from the State University of New York and a Master in Business
Administration from Rutgers University.

         Bennie H. Wallace, Jr., age 45, is a Director and Vice President of
Management and has held such positions since May, 1989. He is also Acquisitions
Manager for Management, a Vice President of PrimeEnergy, a Director of
PrimeEnergy since June, 1993, and is a Vice President and Director of the
operating subsidiaries. He graduated from Louisiana State University in 1975
with a Bachelor of Science degree in petroleum engineering and is a registered
professional


                                       -7-

<PAGE>   9



engineer in the States of Texas and Louisiana and was an independent petroleum
engineer engaged in the evaluation and operation of oil and gas properties from
1983 to 1987.

         Lynne G. Pizor, age 38, has been Controller of Prime Operating Company
since January, 1992, and Eastern Oil Well Service Company since September, 1990.
She also held that position with Management from January 1986 through August,
1994, and PrimeEnergy from May, 1990, through August, 1994. She joined
Management in October, 1984, as Manager of Partnership Accounting. She is a
graduate of Wagner College with a Bachelor of Science degree in Economics and
Business Administration and is a Certified Public Accountant.

         James F. Gilbert, age 65, has been Secretary of Management since June,
1990, Secretary of PrimeEnergy since March, 1973, and was a Director of
PrimeEnergy from that date to October, 1987. He also serves as Secretary of the
operating subsidiaries. He is an attorney in Dallas, Texas.

ITEM 11.          EXECUTIVE COMPENSATION

         The Partnership has no officers, directors or employees. The officers
and employees of the Managing General Partner and PrimeEnergy perform all
management and operational functions of the Partnership. The Partnership does
not pay any direct salaries or other remuneration to the officers, directors or
employees of the Managing General Partner or PrimeEnergy. The Managing General
Partner is reimbursed for the general and administrative expenses of the
Partnership reasonably allocated to the Partnership for in-house expenses
incurred on behalf of the Partnership limited annually to an amount equal to 7%
of the first $7,000,000 and 6% thereafter, of capital contributions, or in the
case of third-party expenses, 3.5% of such contributions. During 1997 and 1996,
the allocation of general and administrative expenses to the Partnership was
$100,000 for each year.

ITEM 12.          SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS AND
                  MANAGEMENT

         The following table shows as of March 16, 1998, the name and address
and the number and percent of Units beneficially and directly owned by each
person, entity or group, known by the Partnership to own more than five percent
of the Units.

<TABLE>
<CAPTION>

                                                     Number
Name and Address of Beneficial Owner                of Units        Percent
- ------------------------------------                --------        -------  
<S>                                                  <C>             <C>
PrimeEnergy Management Corporation
  One Landmark Square
  Stamford, CT 06901.............................     756            8.60

PrimeEnergy Corporation
  One Landmark Square
  Stamford, CT 06901 ............................     568            6.46
</TABLE>





                                       -8-

<PAGE>   10



ITEM 13.          CERTAIN RELATIONSHIPS AND RELATED TRANSACTIONS

         Prime Operating Company acts as the operator for most of the producing
oil and gas wells of the Partnership pursuant to operating agreements with the
Partnership and other working interest owners, including other partnerships
managed by the Managing General Partner, and in 1997 was paid well operating
fees ranging from about $279 to $503 per month per well. Together with well
operating supplies and equipment and related servicing operations are generally
provided by Eastern Oil Well Service Company. The Partnership pays its
proportionate part of such operating fees and expenses. Such fees and expenses
vary depending on such matters as the location of the well, the complexity of
the producing equipment, whether wells produce oil or gas or both and similar
factors. The Partnership believes that such services are as favorable to the
Partnership as they would be if the Partnership entered into such transactions
with unaffiliated third parties. In 1997 and 1996, the Partnership paid an
aggregate of $71,090 and $61,589, respectively, in such fees and expenses.


                                     PART IV

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


         (a)      The following documents are filed as a part of this Report:

                  1.       Financial Statements (Index to the Financial
                           Information at page F-1)

                  2.       Exhibits:

                           (3)   Form of Agreement of Limited Partnership of
                                 Sterling Gas Drilling Fund 1981 (Incorporated
                                 by reference to Exhibit (3) of Sterling Gas
                                 Drilling Fund 1981 Form 10-K for the year
                                 ended December 31, 1994.)

                           (24)  Consent of Ryder Scott Company (filed herewith)

                           (27)  Financial Data Schedule. (filed herewith)


         (b)      Reports on Form 8-K:

                  No reports on Form 8-K have been filed during the last quarter
                  of the year covered by this Report.





                                       -9-

<PAGE>   11



                                   SIGNATURES

         Pursuant to the requirements of Section 13 or 15(d) 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, on the 23rd day of
March, 1998.


                                       Sterling Gas Drilling Fund 1981
                                       By:   PrimeEnergy Management Corporation
                                             Managing General Partner



                                       By:   /s/ CHARLES E. DRIMAL, JR.
                                             ---------------------------------
                                             Charles E. Drimal, Jr.
                                             President

         Pursuant to the requirements of the Securities Exchange Act of 1934,
this report has been signed below by the following persons on behalf of the
Registrant and in the capacities indicated and on the 23rd day of March, 1998.



/s/ CHARLES E. DRIMAL, JR.               Director and President,
- ----------------------------------       PrimeEnergy Management Corporation;
Charles E. Drimal, Jr.                   The Principal Executive Officer       
                                                     




/s/ BEVERLY A. CUMMINGS                  Director and Vice President and 
- ----------------------------------       Treasurer, PrimeEnergy Management 
Beverly A. Cummings                      Corporation; The Principal Financial
                                         and Accounting Officer       
                                                     




/s/ BENNIE H. WALLACE, JR.               Director, PrimeEnergy Management
- ----------------------------------       Corporation
Bennie H. Wallace, Jr.                          



                                      -10-

<PAGE>   12




                         STERLING GAS DRILLING FUND 1981
                        (a New York limited partnership)

                  Index to Financial Information and Schedules

<TABLE>
<CAPTION>

                                                                                       PAGE NO.
                                                                                       --------
<S>                                                                                      <C>
Selected Financial Data                                                                  F-2

Management's Discussion and Analysis of Financial Condition
and Results of Operations                                                                F-2


Report of Independent Public Accountants                                                 F-5

Financial Statements:

       Balance Sheets, December 31, 1997 and 1996                                        F-6

       Statements of Operations for the Years Ended December 31,
       1997, 1996 and 1995                                                               F-7

       Statements of Changes in Partners' Equity for the Years
       Ended December 31, 1997, 1996 and 1995                                            F-8

       Statements of Cash Flows for the Years Ended December 31,
       1997, 1996 and 1995                                                               F-9

       Notes to Financial Statements                                                     F-10


Schedules:

          V  -    Property and Equipment - Oil and Gas Properties for
                  the Years Ended December 31, 1997, 1996 and 1995                       F-18

          VI -    Accumulated Depreciation, Depletion, and Amortization -
                  Oil and Gas Properties for the Years Ended December 31,
                  1997, 1996 and 1995                                                    F-19
</TABLE>


All other schedules have been omitted as the information required is either
included in the financial statements, related notes, or is not applicable.



                                       F-1

<PAGE>   13



ITEM 6.  SELECTED FINANCIAL DATA

         The following table summarizes certain selected financial data to
highlight significant trends in the Registrant's financial condition and results
of operations for the periods indicated. The selected financial data should be
read in conjunction with the financial statements and related notes included
elsewhere in this report.

<TABLE>
<CAPTION>
                               YEAR ENDED DECEMBER 31, (000'S OMITTED)
                               ---------------------------------------
                              1997         1996        1995        1994         1993
                              ----         ----        ----        ----         ----
<S>                        <C>          <C>          <C>          <C>          <C>    
Revenues .............     $   264      $   244      $   291      $   248      $   302
Net income (loss):
   Limited Partners ..         (34)         (48)         (31)        (380)         (84)
   General Partners ..           6            4            9           (5)           5
   Per equity unit ...       (4.63)       (5.46)       (3.47)      (43.23)       (9.51)
Total assets .........       1,161        1,239        1,305        1,389        1,767
Cash distributions:
   Limited Partners ..        --           --           --           --           --
   General Partners ..        --           --           --           --           --
   Limited partners as        --
    a % of original
    contribution .....        --           --           --           --           --
                                                                                  
</TABLE>


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

         1. Liquidity: The oil and gas industry is intensely competitive in all
its phases. There is also competition between this industry and other industries
in supplying energy and fuel requirements of industrial and residential
consumers. It is not possible for the Partnership to calculate its position in
the industry as the Partnership competes with many other companies having
substantially greater financial and other resources. In accordance with the
terms of the Agreement of Limited Partnership of the Partnership, the General
Partners of the Partnership will make cash distributions of as much of the
Partnership cash credited to the capital accounts of the partners as the General
Partners have determined is not necessary or desirable for the payment of any
contingent debts, liabilities or expenses for the conduct of the Partnership
business. As of December 31, 1997, the General Partners have distributed to the
Limited partners $3,955,500. Such cash distributions are equivalent to 45% of
original total Limited Partner capital contributions.

         All aspects of the Partnership's operations and administration are
handled through the use of the operating and Managing General Partner's computer
systems. Both the operations company and the Managing General Partner are taking
steps to minimize any potential computer issues with regard to any necessary
changes for the year 2000. A complete systems upgrade, which includes but is not
limited to, the year 2000 issue will be implemented within the next year by both
the operating company and the Managing General Partner. Both companies' upgrades
and year 2000 changes are part of their normal course of business and no
material


                                       F-2

<PAGE>   14



costs should be allocated to the Partnership for the implementation necessary by
either company.


         The net proved oil and gas reserves of the Partnership are considered
to be a primary indicator of financial strength and future liquidity. The
present value of unescalated future net revenue (S.E.C. case) associated with
such reserves, discounted at 10% as of December 31, 1997 was approximately
$687,900 as compared to December 31, 1996, of about $817,000. Overall reservoir
engineering is a subjective process of estimating underground accumulations of
gas and oil that can not be measured in an exact manner. The accuracy of any
reserve estimate is a function of the quality of available data and of the
engineering and geological interpretation and judgment. Accordingly, reserve
estimates are generally different from the quantities of gas and oil that are
ultimately recovered and such differences may have a material impact on the
Partnership's financial results and future liquidity.

         2. Capital resources: The Partnership was formed for the sole intention
of drilling oil and gas wells. The Partnership entered into a drilling contract
with an independent drilling contractor in December, 1981, for $6,900,000.
Pursuant to the terms of this contract, thirty-seven producing wells, three
non-commercial wells and one plugged well were drilled. The Partnership has had
a reserve report prepared which details reserve value information, and such
information is available to the Limited Partners pursuant to the buy-out
provision of the Agreement of Limited Partnership of the Partnership.

         3.  Results of operations:

         1997 compared to 1996

         Operating revenue increased from $244,020 in 1996 to $264,531 in 1997.
The main variable to effect the overall revenue was the favorable gas pricing
contracts the Partnership participated in for the full twelve months of 1997.
The average price per mcf in 1997 was $2.93 in 1997 as compared to $2.63 in
1996. The Partnership did experience a decline in gas production, from 88,693
mcf in 1996 to 85,541 mcf in 1997. The Partnership receives very little income
from the production of oil and in 1997 both oil production and price were down,
541 barrels and a $19.50 average price in 1996 compared to 515 barrels and an
average price of $18.54 in 1997.

         Overall production expenses increased from $92,332 in 1996 to $103,551
in 1997. Occasionally the Partnership will expend additional funds on light
repairs which the operator has deemed necessary. These repairs are considered an
appropriate means to increase, sustain or halt changes in production. These
contributed to additional cost incurred, which may include additional
maintenance, labor, location, access road work and other needed repairs. The
majority of the rest of the costs expended for 1997 and for the previous year
were for the general upkeep and maintenance at the well and well sites. General
and administrative costs remained relatively unchanged from $118,658 in 1996 to
$117,548 in 1997. Amounts in both years are substantially less than the $439,500
allocable to the Partnership under the Partnership Agreement. Any declines in
these costs reflect management's efforts to limit costs, both incurred and
allocated to the Partnership. Management continues to monitor any third party
costs and use in-house resources if it will provide efficient and timely
services to the Partnership.



                                       F-3

<PAGE>   15




         The Partnership records additional depreciation, depletion and
amortization to the extent that the net capitalized costs exceeds the
undiscounted future net cash flows attributable to the Partnership. No
additional depletion was needed in 1997 or 1996. Normal depletion for both 1997
and 1996 was consistent with the Partnership's remaining property basis and the
appropriate rates applied.

         1996 compared to 1995

         Operating revenue decreased slightly from $254,596 in 1995 to $244,020
in 1996. This can be attributed to lower production of gas and a minor increase
in oil production, from 93,101 mcf and 416 barrels in 1995 to 88,693 mcf and 541
barrels in 1996. The higher oil production combined with a higher average price
per barrel of $19.50 in 1996 partially offset the decline in gas production and
the insignificant change in average price per mcf, from $2.66 in 1995 to $2.63
in 1996. The Partnership generally renews contracts as they come due for twelve
month periods. The Partnership sold a majority of its gas production through a
locked fixed price contract for all of 1996 and has renewed its fixed price gas
contracts for 1997.

         The production expenses incurred in 1995 and 1996 were to maintain the
general upkeep of the wells and well sites. Overall production expenses
increased slightly from $90,706 in 1995 to $92,332 in 1996. The Partnership did
expend funds on additional capitalized well equipment. The operator will
determine if additional equipment, for example lift equipment, will have a
favorable effect on production. The beneficial effect looked for by the operator
is to increase, improve or sustain production on a particular well. General and
administrative costs decreased from $138,674 in 1995 to $118,658 in 1996.
Amounts in both years are substantially less than the $439,500 allocable to the
Partnership under the Partnership Agreement. The lower amounts reflect
management's efforts to limit costs, both incurred and allocated to the
Partnership. Management continues to monitor any third party costs and use
in-house resources if it will provide efficient and timely services to the
Partnership.

         The Partnership records additional depreciation, depletion and
amortization to the extent that the net capitalized costs exceeds the
undiscounted future net cash flows attributable to the Partnership. No
additional depletion was needed in 1996 or 1995. Depreciation, depletion and
amortization rates were slightly lower in 1996 when compared to 1995. The
Partnership's basis in the properties was relatively unchanged from 1995 to
1996. Overall depreciation, depletion and amortization was consistent with the
property basis and rates applied in 1996 and 1995.





                                       F-4




<PAGE>   16


                         STERLING GAS DRILLING FUND 1981
                        (a New York limited partnership)




                    REPORT OF INDEPENDENT PUBLIC ACCOUNTANTS



To the Partners of
Sterling Gas Drilling Fund 1981:


We have audited the accompanying balance sheets of Sterling Gas Drilling Fund
1981 (a New York limited partnership) as of December 31, 1997 and 1996, and the
related statements of operations, changes in partners' equity, and cash flows
for the years ended December 31 1997, 1996 and 1995. These financial statements
are the responsibility of the Partnership's management. Our responsibility is to
express an opinion on these financial statements based on our audits.

We conducted our audits 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 audits provide 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 Sterling Gas Drilling Fund 1981
as of December 31, 1997 and 1996, and the results of its operations and cash
flows for the years ended December 31, 1997, 1996 and 1995 in conformity with
generally accepted accounting principles.

Our audits were made for the purpose of forming an opinion on the basic
financial statements taken as a whole. The schedules listed in the index to
financial statements and schedules are presented for purposes of complying with
the Securities and Exchange Commission's rules and are not part of the basic
financial statements. These schedules have been subjected to the auditing
procedures applied in the examination of the basic financial statements and, in
our opinion, fairly state in all material respects the financial data required
to be set forth therein in relation to the basic financial statements taken as a
whole.



PUSTORINO, PUGLISI & CO., LLP
New York, New York
February 5, 1998



                                      F-5
<PAGE>   17




                         STERLING GAS DRILLING FUND 1981
                        (a New York limited partnership)

                                 BALANCE SHEETS

                           DECEMBER 31, 1997 AND 1996




<TABLE>
<CAPTION>

                                     Assets

                                                                                          1997                 1996
                                                                                        ----------          ----------
<S>                                                                                     <C>                 <C>
Current Assets:
  Cash and cash equivalents (Note 2)                                                    $       16          $        26
                                                                                        ----------          -----------
     Total Current Assets                                                                       16                   26
                                                                                        ----------          -----------

Oil and Gas Properties - successful efforts
 method (Note 3) - (Schedules V and VI):
  Leasehold costs                                                                          236,502              236,502
  Wells and related facilities                                                           6,948,063            6,948,063
                                                                                        ----------          -----------
      Total                                                                              7,184,565            7,184,565

  Less - Accumulated depreciation, depletion                                            (6,023,905)          (5,945,914)
                                                                                        ----------          -----------
          and amortization
                                                                                         1,160,660            1,238,651
                                                                                        ----------          -----------

     Total Assets                                                                       $1,160,676          $ 1,238,677
                                                                                        ==========          ===========



                        Liabilities and Partners' Equity

Current Liabilities:
  Due to affiliates (Note 6)                                                            $  124,096          $   167,538
                                                                                        ----------          -----------
     Total Current Liabilities                                                             124,096              167,538
                                                                                        ----------          -----------

Partners' Equity:
  Limited partners                                                                       1,142,831            1,183,494
  General partners                                                                        (106,251)            (112,355)
                                                                                        ----------          -----------
     Total Partners' Equity                                                              1,036,580            1,071,139
                                                                                        ----------          -----------

     Total Liabilities and Partners' Equity                                             $1,160,676          $ 1,238,677
                                                                                        ==========          ===========

</TABLE>


  The Notes to Financial Statements are an integral part of these statements.



                                      F-6
<PAGE>   18

                        STERLING GAS DRILLING FUND 1981
                        (A New York limited partnership)

                            STATEMENTS OF OPERATIONS

              FOR THE YEARS ENDED DECEMBER 31, 1997, 1996 AND 1995

<TABLE>
<CAPTION>


                                             1997                                        1996                                  
                             --------------------------------------       -------------------------------------                   
                             Limited        General                       Limited       General                         
                             Partners       Partners        Total         Partners      Partners        Total         
                             --------       --------      ---------       --------      --------      ---------       
<S>                         <C>            <C>            <C>            <C>            <C>           <C>
Revenues:
  Operating revenues        $ 222,603      $  41,928      $ 264,531      $ 205,353      $  38,667     $ 244,020
  Other Revenue                  --             --             --             --             --            --   
                            ---------      ---------      ---------      ---------      ---------     ---------
   (Note 10)
     Total Revenues           222,603         41,928        264,531        205,353         38,667       244,020
                            ---------      ---------      ---------      ---------      ---------     ---------

Costs and Expenses:
  Production expenses          87,138         16,413        103,551         77,697         14,635        92,332
  Depreciation,                
   depletion and
   amortization                77,211            780         77,991         75,779            765        76,544
  General and               
   administrative
   expenses (Note 7)           98,917         18,631        117,548         99,851         18,807       118,658
                            ---------      ---------      ---------      ---------      ---------     ---------
    Total Expenses            263,266         35,824        299,090        253,327         34,207       287,534
                            ---------      ---------      ---------      ---------      ---------     ---------

     Net Income (Loss)      $ (40,663)     $   6,104      $ (34,559)     $ (47,974)     $   4,460     $ (43,514)
                            =========      =========      =========      =========      =========     =========

  Net (Loss) Per                                                                           
   Equity Unit (Note 2)     $   (4.63)                                    $  (5.46)
                            =========                                     =========  
</TABLE>

<TABLE>
<CAPTION>
                                                        1995                    
                                       ----------------------------------------                    
                                       Limited         General                           
                                       Partners        Partners          Total          
                                       --------        --------        --------          
<S>                                  <C>              <C>             <C>
Revenues:
  Operating revenues                 $ 214,243        $  40,353       $ 254,596
  Other Revenue

   (Note 10)                            31,049            5,848          36,897
                                     ---------        ---------       ---------
     Total Revenues                    245,292           46,201         291,493
                                     ---------        ---------       ---------

Costs and Expenses:
  Production expenses                   76,329           14,377          90,706
  Depreciation,
   depletion and
   amortization                         82,771              836          83,607
  General and
   administrative
   expenses (Note 7)                   116,695           21,980         138,675
                                     ---------        ---------       ---------

    Total Expenses                     275,795           37,193         312,988
                                     ---------        ---------       ---------

     Net Income (Loss)               $ (30,503)       $   9,008       $ (21,495)
                                     =========        =========       =========

  Net (Loss) Per
   Equity Unit (Note 2)              $   (3.47)
                                     =========
</TABLE>


  The Notes to Financial Statements are an integral part of these statements.


                                      F-7
<PAGE>   19


                         STERLING GAS DRILLING FUND 1981
                        (a New York limited partnership)

                    STATEMENTS OF CHANGES IN PARTNERS' EQUITY

              FOR THE YEARS ENDED DECEMBER 31, 1997, 1996 AND 1995

<TABLE>
<CAPTION>
                                   Limited          General
                                   Partners         Partners           Total
                                 ------------     ------------    -------------
<S>                              <C>              <C>              <C>        
Balance at December 31, 1994     $ 1,261,971      $  (125,823)     $ 1,136,148

Net Income (Loss)                    (30,503)           9,008          (21,495)
                                 -----------      -----------      -----------

Balance at December 31, 1995       1,231,468         (116,815)       1,114,653

Net Income (Loss)                    (47,974)           4,460          (43,514)
                                 -----------      -----------      -----------

Balance at December 31, 1996       1,183,494         (112,355)       1,071,139

Net Income (Loss)                    (40,663)           6,104          (34,559)
                                 -----------      -----------      -----------

Balance at December 31, 1997     $ 1,142,831      $  (106,251)     $ 1,036,580
                                 ===========      ===========      ===========
</TABLE>


  The Notes to Financial Statements are an integral part of these statements.


                                      F-8
<PAGE>   20




                         STERLING GAS DRILLING FUND 1981
                        (a New York limited partnership)

                            STATEMENTS OF CASH FLOWS

              FOR THE YEARS ENDED DECEMBER 31, 1997, 1996 AND 1995

<TABLE>
<CAPTION>



                                                     1997          1996          1995
                                                   --------      --------      --------

<S>                                                <C>           <C>           <C>
Cash Flows From Operating Activities:
 Net (loss)                                        $(34,559)     $(43,514)     $(21,495)
                                                   --------      --------      --------
 Adjustments to reconcile net (loss) to
  net cash provided by operating activities:
   Depreciation, depletion and amortization          77,991        76,544        83,607
   Changes in Assets and Liabilities:
    Due to affiliates                               (43,442)      (23,055)      (62,126)
                                                   --------      --------      --------
        Total Adjustments                            34,549        53,489        21,481
                                                   --------      --------      --------

      Net Cash Provided (Used) by

       Operating Activities                              10         9,975           (14)
                                                   --------      --------      --------
Cash Flows From Investing Activities:
 Equipment purchases                                   --          (9,978)         --
                                                   --------      --------      --------

     Net Cash Provided by Investing Activities         --          (9,978)         --
                                                   --------      --------      --------

Net increase (decrease) in cash and cash                (10)           (3)          (14)
 equivalents

Cash and cash equivalents, beginning of year             26            29            43
                                                   --------      --------      --------

Cash and cash equivalents, end of year             $     16      $     26      $     29
                                                   ========      ========      ========
</TABLE>



  The Notes to Financial Statements are an integral part of these statements.


                                      F-9
<PAGE>   21


                         STERLING GAS DRILLING FUND 1981
                        (a New York limited partnership)

                          NOTES TO FINANCIAL STATEMENTS

                        DECEMBER 31, 1997, 1996 AND 1995



(1)      Organization and Capital Contributions:

         Sterling Gas Drilling Fund 1981, a New York limited partnership (the
         "Partnership"), was formed on September 28, 1981, for the primary
         purpose of acquiring, drilling, developing and producing oil and gas in
         the state of West Virginia. The general partners are: PrimeEnergy
         Management Corporation (PEMC), a wholly owned subsidiary of PrimeEnergy
         Corporation (PEC), Charles E. Drimal, Jr., Oliver J. Sterling and
         Samuel R. Campbell. The subscription period began on October 9, 1981
         and terminated December 15, 1981. Eight thousand seven hundred ninety
         limited partnership units, (8,790), were sold at $1,000 per unit
         aggregating total limited partner capital contributions of $8,790,000.
         The general partners' made no capital contributions. Partnership
         operations commenced on December 23, 1981.


(2)      Summary of Significant Accounting Policies:

         Revenue Recognition:

         The Partnership recognizes operating revenues, consisting of sales of
         oil and gas production, in the month of sale. Uncollected revenue is
         accrued based on known facts and trends of the relevant oil and gas
         properties on a monthly basis.

         Basis of Accounting:

         The accounts of the Partnership are maintained in accordance with
         accounting practices permitted for federal income tax reporting
         purposes. Under this method of accounting, (a) substantially all
         exploration and development costs except leasehold and equipment costs
         are expensed as paid, (b) costs of abandoned leases and equipment are
         expensed when abandoned, and (c) depreciation (for equipment placed in
         service) is provided on an accelerated basis. In order to present the
         accompanying financial statements in accordance with generally accepted
         accounting principles, memorandum adjustments have been made to account
         for oil and gas properties, as discussed below.

         Oil and Gas Producing Activities:

         The Partnership accounts for its oil and gas operations using the
         successful efforts method of accounting on a property by property
         basis. The Partnership only participates in developmental drilling and,
         accordingly, all costs of drilling and equipping these wells, together
         with leasehold acquisition costs, are capitalized. These


                                      F-10
<PAGE>   22




                         STERLING GAS DRILLING FUND 1981
                        (a New York limited partnership)

                          NOTES TO FINANCIAL STATEMENTS

                        DECEMBER 31, 1997, 1996 AND 1995


(2)      Summary of Significant Accounting Policies - (Cont'd):

         capitalized costs are amortized on a property by property basis
         (utilizing aggregations of common geological structures) by the
         unit-of-production method based upon the ratio of production to proved
         developed oil and gas reserves. Additional depreciation, depletion and
         amortization is recorded to the extent that net capitalized costs
         exceed the undiscounted future net cash flows attributable to
         Partnership properties. (See Note 4)

         Federal Income Taxes:

         As federal income taxes are the liability of the individual partners,
         the accompanying financial statements do not include any provision for
         federal income taxes. (See Note 8)

         Limited Partners' (Loss) Per Equity Unit:

         The limited partners' (loss) per equity unit is computed on the 8,790
         limited partner equity units.

         Cash and Cash Equivalents:

         For purposes of the statements of cash flows the Partnership considers
         all highly liquid debt instruments with a maturity of three months or
         less to be cash equivalents.

         Use of Estimates:

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

         Recently Issued Accounting Standards:

         The Partnership has implemented the provisions of FAS Statement No. 121
         "Accounting for the Impairment of Long-Lived Assets and for Long-Lived
         Assets to be Disposed of." The implementation of this standard has had
         no material effect on the financial statements.



                                      F-11
<PAGE>   23



                         STERLING GAS DRILLING FUND 1981
                        (a New York limited partnership)

                          NOTES TO FINANCIAL STATEMENTS

                        DECEMBER 31, 1997, 1996 AND 1995


(3)      Oil and Gas Properties:

         The Partnership acquired leases or farmouts from PEMC at its cost. Cost
         is defined as any amount paid for delay rentals, lease bonuses, if any,
         surveys and other expenses including such portion of any of the general
         partners', or their affiliates' reasonable, necessary and actual
         expenses for geological, geophysical, seismic, land, engineering,
         drafting, accounting, legal and other services. During 1981, the
         Partnership, as reimbursement of costs for leases it acquired from
         PEMC, paid PEMC $236,502. The Partnership currently pays royalties of
         approximately 12.5% to 20.8% of the selling price of the gas and oil
         extracted.

         The following table sets forth certain revenue and expense data
         concerning the Partnership's oil and gas activities for the years ended
         December 31, 1997, 1996 and 1995:
<TABLE>
<CAPTION>
                                                   1997      1996     1995
                                                  ------    ------    -----
<S>                                               <C>        <C>      <C>  
          Average sales price per MCF of gas      $ 2.93     $2.63    $2.66
          Average sales price per barrel of        18.54     19.50    16.72
            oil and other liquids
          Production expense per dollar of           .40      0.38     0.36
            operating revenue
</TABLE>


(4)      Quantities of Oil and Gas Reserves:

         The amount of proved reserves presented below has been estimated by an
         independent firm of petroleum engineers as of January 1, 1997.
         Petroleum engineers on the staff of PEC have reviewed the data
         presented below, as of December 31, 1997, for consistency with current
         year production and operating history. All of the Partnership's gas and
         oil reserves are located within the United States:

<TABLE>
<CAPTION>
                                                           (Unaudited)
                                                  -----------------------------
                                                    GAS (MCF)         OIL (BBL)
                                                  ------------       ----------
<S>                                               <C>                <C>  
Reserves as of December 31, 1994                   1,208,528              1,015
Revisions of previous estimates                      338,127              2,924
Production                                           (93,101)              (416)
                                                  ----------         ----------

Reserves as of December 31, 1995                   1,453,554              3,523
Revisions of previous estimates                       70,045                662
Production                                           (88,693)              (541)
                                                  ----------         ----------

Reserves as of December 31, 1996                   1,434,906              3,644
Revisions of previous estimates                      (76,355)             1,564
Production                                           (85,541)              (515)
                                                  ----------         ----------

Reserves as of December 31, 1997                   1,273,010              4,693
                                                  ==========         ==========

</TABLE>


                                      F-12
<PAGE>   24




                         STERLING GAS DRILLING FUND 1981
                        (a New York limited partnership)

                          NOTES TO FINANCIAL STATEMENTS

                        DECEMBER 31, 1997, 1996 AND 1995






(4)      Quantities of Oil and Gas Reserves - (Cont'd):

         If current prices were to prevail into the future, operation of certain
         wells would become uneconomic, on a pretax basis, as production levels
         decline with age. In accordance with the rules and regulations of the
         Securities and Exchange Commission, proved reserves exclude production
         which would be uneconomic. The partners are entitled to certain tax
         benefits and credits which, if available in the future, may result in
         production continuing beyond that included above.

         Revisions arise from changes in current prices, as well as, engineering
         and geological data which would alter the useful life and therefore the
         overall predicted production of each well. Future changes in these
         estimates are common and would impact the reserve quantities used to
         calculate depreciation, depletion, and amortization.

         As discussed in Note 2, the Partnership records additional
         depreciation, depletion and amortization to the extent that net
         capitalized costs exceed the undiscounted future net cash flows
         attributable to Partnership properties. Significant price declines
         affect estimated future net revenues both directly and because of
         they're impact on estimates of future production. The Partnership has
         recorded no additional provision in 1997, 1996 or 1995. If the
         additional provision had been computed based on the limited partners'
         interest in capitalized costs and estimated future net revenues, rather
         than on the basis of total Partnership interests, the limited partners
         income equity would not have been reduced in 1997, 1996 or 1995.



                                      F-13
<PAGE>   25




                         STERLING GAS DRILLING FUND 1981
                        (a New York limited partnership)

                          NOTES TO FINANCIAL STATEMENTS

                        DECEMBER 31, 1997, 1996 AND 1995




(5)      Allocation of Partnership Revenues, Costs and Expenses:

         Under the terms of the Limited Partnership Agreement, all Partnership
         revenues and expenses, including deductions attributable thereto, are
         to be allocated as follows:

         Drilling and completion costs (paid out of initial capital
         contributions):

             Limited partners                                99.00%
             General partners                                 1.00%
                                                            ------
                                                            100.00%
                                                            ======

         Expenses of organization, costs of acquiring leases and the
         nonrecurring management fee:

             Limited partners                               100.00%
             General partners                                   - %
                                                            ------
                                                            100.00%
                                                            ======

         Net Revenue from oil and gas operations, general and administrative
         expenses and production operating fees:

             Limited partners                                84.15%
             General partners                                15.85%
                                                            ------
                                                            100.00%
                                                            ====== 
         All other income, gains, losses, costs, expenses, deductions and
         credits:

             Limited partners                                99.00%
             General partners                                 1.00%
                                                             -----
                                                            100.00%
                                                            ------ 

(6)      Transactions With Affiliates:

         (a)    The payable to affiliates at December 31, 1997 and 1996
                represents all revenues and expenses collected or incurred on
                behalf of the Partnership by PEC and its subsidiaries, including
                the production operator's fees (Note 6(b)) and any advances made
                to the Partnership. PEMC intends to continue to make advances to
                the Partnership to fund any working capital deficiencies in the
                future on an interest free basis.


                                      F-14
<PAGE>   26




                         STERLING GAS DRILLING FUND 1981
                        (a New York limited partnership)

                          NOTES TO FINANCIAL STATEMENTS

                        DECEMBER 31, 1997, 1996 AND 1995







(6)      Transactions With Affiliates - (Cont'd):

         (b)    As operator of the Partnership's properties, Prime Operating
                Company (POC), a subsidiary of PEC, receives, as compensation
                from the Partnership, a monthly production operator's fee of
                $279 for each producing gas well and $503 for each producing oil
                or combination gas and oil well, based on the Partnership's
                percentage of working interest in the well. These fees are
                subject to annual adjustment by the percentage increase in the
                Cost of Living Index published by the U.S. Department of Labor
                over the year in which production began. During 1997, 1996 and
                tatt1995, $68,976, $56,420 and $49,654 of production operator's
                fees were incurred, respectively.

         (c)    Eastern Oil Well Services Company (EOWSC), a subsidiary of PEC,
                provided field services to the Partnership during the year
                ending December 31, 1997 for which it was billed $2,114.

(7)      General and Administrative Expenses:

         In accordance with the Management Agreement, PEMC will be reimbursed
         for the portion of PEMC's in-house overhead, including salaries and
         related benefits, attributable to the affairs and operations of the
         Partnership not exceeding an annual maximum amount of $440,000.

         In addition, the Partnership will pay for third party expenses for
         geology, engineering, legal, accounting, auditing, insurance and other
         items not exceeding an annual amount equal to 3.5% of limited partner
         capital contributions. The excess, if any, shall be borne by the
         general partners in their individual capacity.

         During 1997, 1996 and 1995, the Partnership recognized general and
         administrative expenses incurred on its behalf by a general partner of
         $100,000, $100,000 and $120,000, respectively.



                                      F-15
<PAGE>   27




                         STERLING GAS DRILLING FUND 1981
                        (a New York limited partnership)

                          NOTES TO FINANCIAL STATEMENTS

                        DECEMBER 31, 1997, 1996 AND 1995







(8)      Federal Income Taxes:

         The following is a reconciliation between the net income (loss) as
         reported on the Partnership's federal income tax return and the net
         income (loss) reported in the accompanying financial statements:

<TABLE>
<CAPTION>
                                                  Year Ended December 31,
                                         --------------------------------------
                                           1997          1996           1995
                                         ---------     ---------     ----------
<S>                                      <C>            <C>            <C>    
Net income (loss) as
 reported on the
 Partnership's federal
 income tax return                       $ 40,239       $ 31,035       $ 62,113

Depreciation, depletion and 
 amortization for financial
 reporting purposes
 (greater) less than income
 tax amount                              $(74,798)      $(74,549)      $(83,607)
                                         --------       --------       --------
Net (loss) per accompanying

 financial statements                    $(34,559)      $(43,514)      $(21,494)
                                         ========       ========       ========
</TABLE>

         The tax returns of the Partnership, the qualifications of the
         Partnership as such for tax purposes, and the amount of Partnership
         income or loss are subject to examination by federal and state taxing
         authorities. If such examinations result in changes with respect to
         Partnership's qualifications or in changes to its income or loss, the
         tax liability of the partners would be changed accordingly.

         The Tax Reform Act of 1976 provides that no part of any depletion
         deduction with respect to oil and gas wells is to be determined by the
         Partnership but must be computed separately by the partners. Thus, cost
         or percentage depletion, as applicable, must be computed by each
         partner so that a specific depletion computation can be made when each
         partner files his U.S. income tax return. Information is furnished to
         the partners to compute the depletion deduction.



                                      F-16
<PAGE>   28




                         STERLING GAS DRILLING FUND 1981
                        (a New York limited partnership)

                          NOTES TO FINANCIAL STATEMENTS

                        DECEMBER 31, 1997, 1996 AND 1995







 (9)     Major Customers:

         A schedule of the major purchases of the Partnership's production is as
follows:

<TABLE>
<CAPTION>

             Purchaser                 1997        1996         1995
             ---------               --------    --------     --------
             <S>                     <C>          <C>         <C>     
             Brooklyn Union          $140,133     $146,923    $160,221
             Phoenix Diversified     $ 97,986     $ 70,723    $ 60,053
</TABLE>

         The Partnership renewed its gas purchase contract with Phoenix
Diversified in December 1997 resulting in a fixed price for one year.


(10)     Other Revenue:

         Other revenue represents settled claims against Columbia Gas
         Transmission Corp. (Columbia) arising from amounts due from Columbia
         when they declared bankruptcy. No significant additional claims are
         expected concerning this matter.




                                      F-17
<PAGE>   29






                                   SCHEDULE V


                         STERLING GAS DRILLING FUND 1981
                        (A New York limited partnership)

                 PROPERTY AND EQUIPMENT - OIL AND GAS PROPERTIES

              FOR THE YEARS ENDED DECEMBER 31, 1997, 1996 AND 1995


<TABLE>
<CAPTION>
                                    Balance at                                            Balance
                                    Beginning     Additions                 Other         at End
                                     of Year       at Cost    Retirements  Changes        of Year
                                   ----------     ---------   ----------- ----------     ----------
<S>                                <C>            <C>          <C>        <C>            <C>
Year Ended December 31, 1997:
  Leasehold costs                  $  236,502     $   --       $ --       $     --       $  236,502
  Wells and related facilities      6,948,063         --         --             --        6,948,063
                                   ----------     --------     ------     ----------     ----------
                                   $7,184,565     $   --       $ --       $     --       $7,184,565
                                   ==========     ========     ======     ==========     ==========
Year ended December 31, 1996:
  Leasehold costs                  $  236,502     $   --       $ --       $     --       $  236,502
  Wells and related facilities      6,938,085        9,978       --             --        6,948,063
                                   ----------     --------     ------     ----------     ----------
                                   $7,174,587     $  9,978     $ --       $     --       $7,184,965
                                   ==========     ========     ======     ==========     ==========

Year Ended December 31, 1995:
  Leasehold costs                  $  236,502     $   --       $ --       $     --       $  236,902
  Wells and related facilities      6,938,085         --         --             --        6,938,085
                                   ----------     --------     ------     ----------     ----------
                                   $7,174,587     $   --       $ --       $     --       $7,174,587
                                   ==========     ========     ======     ==========     ==========
</TABLE>



                                      F-18
<PAGE>   30


                                   SCHEDULE VI


                         STERLING GAS DRILLING FUND 1981
                        (a New York limited partnership)

  ACCUMULATED DEPRECIATION, DEPLETION AND AMORTIZATION - OIL AND GAS PROPERTIES

              FOR THE YEARS ENDED DECEMBER 31, 1997, 1996 AND 1995



<TABLE>
<CAPTION>
                                   Balance at      Charges to                              Balance
                                   Beginning       Costs and                 Other         at End
                                    of Year         Expenses    Retirements  Changes       of Year
                                   ----------    ------------- ------------  --------    ---------- 
<S>                                <C>            <C>            <C>         <C>         <C>
Year Ended December 31, 1997:
  Wells and related facilities     $5,709,412     $   77,991     $  --       $  --       $5,787,403
  Leasehold costs                     236,502           --          --          --          236,502
                                   ----------     ----------     -------     -------     ----------
                                   $5,945,914     $   77,991     $  --       $  --       $6,023,905
                                   ==========     ==========     =======     =======     ==========

Year ended December 31, 1996:
  Wells and related facilities     $5,632,868     $   76,544     $  --       $  --       $5,709,412
  Leasehold costs                     236,502           --          --          --          236,502
                                   ----------     ----------     -------     -------     ----------
                                   $5,869,370     $   76,544     $  --       $  --       $5,945,914
                                   ==========     ==========     =======     =======     ==========

Year Ended December 31, 1995:                                                                      
  Wells and related facilities     $5,549,261     $   83,607     $  --       $  --       $5,632,868
  Leasehold costs                     236,502           --          --          --          236,502
                                   ----------     ----------     -------     -------     ----------
                                   $5,785,763     $   83,607     $  --       $  --       $5,869,370
                                   ==========     ==========     =======     =======     ==========
</TABLE>



                                      F-19
<PAGE>   31


                                INDEX TO EXHIBITS
<TABLE>
<CAPTION>

                                                                         SEQUENTIALLY
EXHIBIT                                                                    NUMBERED
NUMBER                       EXHIBIT                                         PAGE
- ------                       -------                                     ------------- 
<S>                                                                      <C> 
 (3)   Form of Agreement of Limited Partnership of Sterling Gas Drilling
       Fund 1981 (incorporated by reference to Exhibit (3) of Sterling
       Gas Drilling Fund 1981 Form 10-K for the year ended December 31,
       1994)

 (24)  Consent of Ryder Scott Company (filed herewith)

 (27)  Financial Data Schedule. (filed herewith)

</TABLE>





<PAGE>   1
                                                                      EXHIBIT 24

                        [RYDER SCOTT COMPANY LETTERHEAD]

                         CONSENT OF RYDER SCOTT COMPANY

         We consent to the use on Form 10-K of Sterling Gas Drilling Fund 1981
of our reserve report and all schedules, exhibits, and attachments thereto
incorporated by reference on Form 10-K and to any reference made to us on Form
10-K as a result of such incorporation.

                                       Very truly yours,

                                       /s/ RYDER SCOTT COMPANY
                                           PETROLEUM ENGINEERS

                                       RYDER SCOTT COMPANY
                                       PETROLEUM ENGINEERS

Denver, Colorado
March 10, 1997

<TABLE> <S> <C>

<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM STERLING GAS
DRILLING FUND 1981 FORM 10-K AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO
SUCH FINANCIAL STATEMENTS.
</LEGEND>
       
<S>                             <C>
<PERIOD-TYPE>                   YEAR
<FISCAL-YEAR-END>                          DEC-31-1997
<PERIOD-END>                               DEC-31-1997
<CASH>                                              16
<SECURITIES>                                         0
<RECEIVABLES>                                        0
<ALLOWANCES>                                         0
<INVENTORY>                                          0
<CURRENT-ASSETS>                                    16
<PP&E>                                       7,184,565
<DEPRECIATION>                             (6,023,905)
<TOTAL-ASSETS>                               1,160,676
<CURRENT-LIABILITIES>                          124,096
<BONDS>                                              0
                                0
                                          0
<COMMON>                                             0
<OTHER-SE>                                   1,036,580<F1>
<TOTAL-LIABILITY-AND-EQUITY>                 1,160,676
<SALES>                                        264,531
<TOTAL-REVENUES>                               264,531
<CGS>                                          299,090
<TOTAL-COSTS>                                  299,090
<OTHER-EXPENSES>                                     0
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                                   0
<INCOME-PRETAX>                                      0
<INCOME-TAX>                                         0
<INCOME-CONTINUING>                                  0
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                  (34,559)
<EPS-PRIMARY>                                   (4.63)<F2>
<EPS-DILUTED>                                        0
<FN>
<F1>Other - SE is composed of partnership equity.
<F2>EPS - Primary is based upon limited partners share of net income divided by the
outstanding partnership units of 8,790.
</FN>
        

</TABLE>


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