SOUTH TEXAS DRILLING & EXPLORATION INC
10-K405, 1998-06-26
DRILLING OIL & GAS WELLS
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<PAGE>   1
            

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

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

                                    FORM 10-K

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

For the fiscal year ended March 31, 1998

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

Commission File Number   2-70145

                    SOUTH TEXAS DRILLING & EXPLORATION, INC.
             (Exact name of registrant as specified in its charter)

<TABLE>
<S>                                                                                       <C>
              TEXAS                                                                                74-2088619
       (State or other jurisdiction                                                             (I.R.S. Employer
   of incorporation or organization)                                                         Identification Number)

9310 Broadway, Bldg. I                          San Antonio, Texas                                    78217
(Address of principal executive offices)                                                            (Zip Code)

Registrant's telephone number, including area code 210-828-7689

Securities registered pursuant to Section 12(b) of the Act:

Title of each class                                                                       Name of each exchange on
                                                                                           which registered
       None                                                                                     None
</TABLE>

           Securities registered pursuant to Section 12(g) of the Act:
                          Common Stock $0.10 par value

   Indicate by check mark whether the Registrant (1) has filed all reports
required to be filed by Section 13 or 15(d) of the Securities 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 ( 229.405 of this chapter) 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.
                                                                             (X)

   State the aggregate market value of the voting stock held by non-affiliates
of the registrant (computed by reference to the average of bid and ask closing
sales prices on June 5, 1998): $6,079,806

   Indicate the number of shares outstanding of each of the registrant's classes
of common stock, as of June 5, 1998.

         Class:  Common Stock                      Shares Outstanding: 5,832,197
         Par Value:  $0.10






<PAGE>   2


            SOUTH TEXAS DRILLING & EXPLORATION, INC. AND SUBSIDIARIES

                                     PART I

ITEM 1.           BUSINESS

    South Texas Drilling & Exploration, Inc. and its subsidiaries (the
"Company") are engaged in the business of providing land contract drilling
services for the oil and gas industry; oil and gas exploration and development
activity for its own account; and operation of oil and gas wells for its own
account and those of outside investors. The Company's main focus continues to be
its land contract drilling services and in fiscal year 1998, the oil and gas
operations contributed an immaterial amount towards the Company's gross revenue.
The revenues; earnings (loss) from operations; identifiable assets;
depreciation, depletion and amortization; and capital expenditures are reported
for each of its business segments for the fiscal years ended March 31, 1997 and
1996 in note 5 ("Business Segments and Supplementary Earnings Information") of
the Notes to Consolidated Financial Statements, which note is incorporated
herein by reference. Fiscal 1998 oil and gas operations are immaterial, and
therefore separate disclosure of this information has been omitted.

    This Form 10K contains certain "forward-looking" statements as such term is
defined in The Private Securities Litigation Reform Act of 1995 and information
relating to the Company and its subsidiaries that are based on the beliefs of
the Company's management. When used in this report, the words "anticipate,"
"believe," "estimate," "expect" and "intend" and words or phrases of similar
import, as they relate to the Company or its subsidiaries or Company management,
are intended to identify forward-looking statements. Such statements reflect the
current risks, uncertainties and assumptions related to certain factors
including, without limitation, competitive factors, general economic conditions,
customer relations, relationships with vendors, the interest rate environment,
governmental regulation and supervision, seasonality, distribution networks,
product introductions and acceptance, technological change, changes in industry
practices, one-time events and other factors described herein and in other
filings made by the Company with the Securities and Exchange Commission. Based
upon changing conditions, should any one or more of these risks or uncertainties
materialize, or should any underlying assumptions prove incorrect, actual
results may vary materially from those described herein as anticipated,
believed, estimated, expected, or intended. The Company does not intend to
update these forward-looking statements.


                                CONTRACT DRILLING

    At the end of fiscal 1998, the Company owned seven land drilling rigs with
approximate depth capabilities ranging from 6,000 feet to 12,000 feet. Of the
seven rigs, six are operational. The seventh rig was purchased in October, 1997,
and is scheduled to be refurbished during fiscal 1999. Of the remaining six
rigs, four were operated during all of fiscal 1998. The other two were in
operation from June, 1997, when they were purchased. Additionally, the Company
operated a leased rig, Rig 10, from June 1997 to January 1998. The Company's
rigs are presently operating in south Texas and along the Gulf Coast of Texas.
All six of the rigs are currently in operation.

     On June 18, 1997, the Company closed on the purchase of the drilling
operations of San Patricio Corporation, a drilling contractor based in Corpus
Christi, Texas. Equipment purchased in this transaction included two land
drilling rigs with depth capabilities ranging from 6,000' to 10,500' and a
leased land drilling rig, Rig 10, with depth capability of 9,500'. The
acquisition was accomplished with $900,000 of third-party financing, $300,000 of
seller financing and $300,000 of the Company's Common Stock. The leased rig was
returned to the lessor in February, 1998.

    On October 20, 1997, the Company purchased a Skytop-Brewster N-46 drilling
rig. This rig, designated Rig 15, is stored in the Company's yard in Kenedy,
Texas awaiting refurbishment. Once the rig is refurbished it will have a depth
capability of approximately 14,000 feet.



                                       -2-

<PAGE>   3


            SOUTH TEXAS DRILLING & EXPLORATION, INC. AND SUBSIDIARIES

Drilling Equipment

    A land drilling rig consists of engines, drawworks, mast, pumps to circulate
the drilling mud, blowout preventors, drillstring and related equipment. The
size and type of rig used depends upon well depth and site conditions, among
other factors. A description of the type and capability of the land drilling
rigs operated by the Company during fiscal 1998 is set forth in the following
table:

<TABLE>
<CAPTION>
                                                                     Approximate                  Aggregate
             Rig                                                        Depth                    Utilization
           Number                         Type                       Capability                  During 1998
           ------                         ----                       ----------                  -----------
            <S>                    <C>                                 <C>                           <C>
              4                     Skytop - Brewster
                                          N-46                         11,500                        72%
              5                    Gardner-Denver 500H                 10,500                        82%
              6                     Skytop - Brewster
                                         DHI-4610                      10,500                        76%
              9                        Weiss W-45                       8,500                        71%
             10(1)                     IDECO H-44                       9,500                        88%
             11                     Skytop - Brewster
                                           N-46                        12,500                        85%
             14                     Skytop - Brewster
                                           N-46                        12,000                        65%
</TABLE>

(1) Rig 10 was the leased rig which was returned to the lessor in February, 
    1998.

    Minor repair work on the drilling rigs is performed on-site by the Company's
employees, but major repair work and overhaul of drilling equipment on a
contractual basis are performed by unaffiliated oil field service companies. In
the event of major breakdowns or mechanical problems, the Company's rigs could
be subject to significant idle time and a resulting loss of revenue if such
repair services were not immediately available. The Company engages in periodic
maintenance and improvement of its drilling equipment and believes that its
drilling rigs and other related equipment are in good operating condition. The
Company has experienced no substantial down time as the result of repair or
overhaul of its equipment.

    Principal materials, supplies and equipment necessary for drilling
operations are fuels to operate drilling equipment, drilling mud, tubular steel,
cement, drill bits, and other miscellaneous items. Certain of these items were
in short supply from time to time during prior periods of high drilling demand.
At the present time, the Company is not experiencing any significant shortages
of materials, supplies and equipment used in drilling, and does not foresee any
shortages materially affecting its operations. However, certain equipment items,
such as used drill pipe, are becoming more difficult to find, requiring the
purchase of more expensive new equipment.

Contracts

    All contracts under which the Company is presently conducting its land
drilling operations provide for rate charges determined on a daywork, footage or
turnkey basis, with rates dependent on the anticipated complexity of drilling
the well, on-site drilling conditions, the type of equipment to be used, the
Company's estimate of the risks involved, the duration of the work to be
performed and competitors' rates among other considerations. Daywork contracts
provide for a fixed charge per day for drilling the well, and the customer
generally bears the major portion of the related costs and risks of drilling.

    With certain limitations, contracts entered into on a footage basis provide
for an agreed price per foot drilled regardless of the time required or the
problems involved in drilling the well. Related costs of drilling (i.e., rig

                                       -3-

<PAGE>   4


            SOUTH TEXAS DRILLING & EXPLORATION, INC. AND SUBSIDIARIES

mobilization, labor, fuel usage and other costs) are included in the footage
charge. As compared to daywork contracts, footage contracts involve a higher
degree of risk to the Company.

    Contracts entered into on a turnkey basis usually require the Company to
deliver to the operator a completed hole drilled to a specified depth. In
addition to all costs incurred when drilling on a footage basis, the Company is
usually also responsible for drilling fluids, water and other costs. As this
type of contract places a greater degree of risk on the Company than daywork or
footage contracts, the anticipated gross margin on this type of contract is
usually greater than on daywork or footage contracts.

    Drilling contracts are obtained either through competitive bidding or
through direct negotiation. Contracts are usually entered into by the Company
covering the drilling of one well and obligate the Company to advance certain
costs and to assume certain expenses in connection with drilling operations.
During the year ended March 31, 1998 the Company drilled 68 wells with 59% of
contract drilling revenues attributable to daywork contracts, 10% to footage
contracts, and 31% to turnkey contracts. During the year ended March 31, 1997
the Company drilled 46 wells with 72% of contract drilling revenues attributable
to daywork contracts, 17% to footage contracts, and 11% to turnkey contracts.

    In several previous years uncertainty relating to oil and gas prices and the
domestic gas surplus has led to significant reductions in drilling activity by
oil and gas producing companies. Furthermore, the phased-in reduction of the
highest marginal income tax rates applicable to individual investors has
previously reduced commitments of capital to oil and gas drilling funds.
Additionally, increased costs due to government regulation have resulted in the
movement of much of the drilling activities to locations overseas. The aggregate
impact of these diverse economic factors has resulted in significant reductions
of oil company commitments to domestic oil and gas exploration and consequent
slackening of overall demand for drilling rigs prior to fiscal 1997. Fiscal
1997, however, saw a reversal of the downward trend of prior years. The
increased drilling activity continued through the third quarter of fiscal 1998,
but it has weakened considerably since January, 1998 due primarily to a
substantial decrease in oil prices.

    During the year ended March 31, 1998, the largest customer of the Company's
drilling rigs was Michael Petroleum Corporation. This customer accounted for
approximately 18% of contract drilling revenues of the Company during that
period. Only one other customer, Samedan Oil Corporation with approximately 14%,
accounted for more than 10% of the Company's contract drilling revenues for
1998.

    The Company actively markets its rigs and completed contracts for 37
customers in 1998 compared to 32 customers in 1997 and 27 customers in 1996.

    The loss of any of the Company's land drilling customers could have a
material adverse effect on the Company's business, particularly with respect to
the time required to find other users of the rig concerned. See "Competitive,
Business and Operational Risks in Contract Drilling" in Part I.

Competitive, Business and Operational Risks in Contract Drilling

    The Company encounters substantial competition in its contract drilling
operations from other drilling contractors. The usual method of competition in
the contract drilling industry is on the basis of price, customer relations, rig
availability and suitability, service, performance and condition of equipment
used. Competition for contract drilling is primarily on a regional basis, and
many of the Company's competitors in south Texas have financial resources, and
technical staffs and facilities substantially greater than those of the Company.

    Land contract drilling in oil and gas operations is subject to a number of
operational risks and hazards including blowouts, cratering, fires and
explosions. Any one of these happenings could cause serious damage to equipment,
personnel, property and/or the financial condition of the Company. In addition,
there is a risk that damage to the environment could result from some of the
Company's operations, particularly through oil spillage or extensive,
uncontrolled fires. While the Company believes that it is adequately insured
against normal and foreseeable risks in its

                                       -4-

<PAGE>   5


            SOUTH TEXAS DRILLING & EXPLORATION, INC. AND SUBSIDIARIES

operations in accordance with industry standards, such insurance may not be
adequate to protect the Company against liability from all consequences of well
disasters, extensive fire damage, or damage to the environment. In the event
that such insurance was not adequate, the occurrence of a significant event
could have a material adverse effect on the Company's financial position and
results of operations. Under current conditions, the Company anticipates that
its present insurance coverage will be maintained, but no assurance can be given
that insurance coverage will continue to be available at rates considered
reasonable or that certain types of coverage will be available at any cost.

                      OIL AND GAS OPERATIONS AND PROPERTIES

    The Company's oil and gas operations consist of the ownership of certain oil
and gas properties and the exploration, development and production of oil and
gas. In June, 1992, the Company acquired operating interests in 17 producing
wells. During fiscal 1994 and fiscal 1995 the Company drilled three additional
wells. No wells have been added since fiscal 1995. In fiscal 1997, the Company
sold its interest in one well. At the present time, the Company is in
negotiations to purchase additional working interests in the wells it operates.
Due to the Company's acquisitions of substantial amounts of drilling equipment
in fiscal 1998, the Company's oil and gas operations no longer constitute a
significant portion of the Company's operations. Accordingly, separate
disclosure of fiscal 1998 oil and gas information has been omitted from this
report. However, any information disclosed in years still being reported on in
this report will continue to be disclosed.

Production Information

    The Company is involved in oil and gas exploration, development and
production. Oil and gas production accounted for approximately 1.8% of the
Company's total revenues in the fiscal year ended March 31, 1998 compared with
4.7% in the fiscal year ended March 31, 1997 and 5.1% in the fiscal year ended
March 31, 1996.

<TABLE>
<CAPTION>
                                                                            Years Ended March 31,
                                                                       -----------------------------
                                                                       1997                     1996
                                                                       ----                     ----
<S>                                                                  <C>                       <C>
Oil Production (in Bbls)(1)                                            10,007                   12,260
Gas production (in Mcf)(1)                                             65,963                   89,802
Revenues from production(1)                                          $401,542                  380,110
Production (lifting) costs(2)                                        $177,318                  169,008
        Net Revenues                                                 $224,224                  211,102
Average sales price:
        Oil (per Bbl)                                                $     22                    17.70
        Gas (per Mcf)                                                $      3                     1.84
Average production cost per unit (in
        barrel equivalents)(3)                                       $      8                     6.21
</TABLE>

(1)     Oil and gas production is shown net of royalties attributable to the
        interests of others and is based upon production reports furnished to
        the Company by the operators.

(2)     "Production (lifting) costs" are costs directly related to the
        extraction of oil or gas including production taxes, but do not include
        depreciation, or amortization of exploration and development costs.


                                       -5-

<PAGE>   6


            SOUTH TEXAS DRILLING & EXPLORATION, INC. AND SUBSIDIARIES

(3)     Average production costs per unit were determined on the basis of six 
        Mcf of gas being equivalent to one barrel of oil.

                             GOVERNMENTAL REGULATION

        Governmental regulations promulgated by various state and federal
authorities directly influence the Company's operations insofar as they regulate
operations of the Company's rigs, impact prices and therefore supplies of and
demands for oil and gas, and influence various costs associated with petroleum
exploration and production.

Future Legislation

        Currently there are many legislative proposals pertaining to regulation
of the oil and gas industry, which may directly or indirectly affect the
Company's activities. No prediction can be made as to what additional energy
legislation may be proposed, if any, or which bills may be enacted or when any
such bills, if enacted, would become effective.

Regulation of the Environment

        The exploration, development, production and processing of oil and gas,
including the disposal of produced water, are subject to various federal and
state laws and regulations designed to protect the environment. Compliance with
these regulations is part of the Company's day-to-day operating procedures.
Infrequently, accidental discharge of such materials as oil, natural gas,
drilling fluids or contaminated water can and does occur. Such accidents can
require material expenditures to correct.

        Various state and governmental agencies are considering, and some have
adopted, other laws and regulations regarding environmental control which could
adversely affect the business of the Company. Compliance with such measures,
together with any penalties resulting from noncompliance therewith, may increase
the cost of oil and gas development, production and processing operations or may
affect the ability of the Company to complete existing or future activities in a
timely manner.

Compliance with Regulations

        The Company believes that it complies with all material legislation and
regulations affecting its operations in the drilling and operation of oil and
gas wells, and in controlling the discharge of wastes. Compliance has not, to
date, materially affected the capital expenditures, earnings or competitive
position of the Company, although these measures add to the costs of operating
drilling equipment in some instances, and in others they may operate to reduce
drilling activity. The Company does not expect to incur material capital
expenditures in the next fiscal year in order to comply with current
environmental control regulations. Further legislation or regulation may
reasonably be anticipated, but the effects thereof on operations cannot be
predicted.

        The Company is subject to the requirements of the federal Occupational
Safety and Health Act ("OSHA") and comparable state statutes. The OSHA hazard
communication standard, the Environmental Protection Agency "community
right-to-know" regulations under Title III of the Federal Superfund Amendment
and Reauthorization Act and comparable state statutes require the Company to
organize and report certain information about the hazardous materials used in
its operations to employees, state and local government authorities, and local
citizens.



                                       -6-

<PAGE>   7


            SOUTH TEXAS DRILLING & EXPLORATION, INC. AND SUBSIDIARIES

                               PRINCIPAL CUSTOMERS

        During the fiscal year ended March 31, 1998, Michael Petroleum
Corporation accounted for 18% of the Company's total drilling revenues. Only one
other customer, Samedan Oil Corporation with approximately 14%, accounted for
10% or more of the Company's total drilling revenue. The loss of either of these
customers could have a material adverse effect on the Company's business
resulting from the time required to find other users of the Company's rigs. See
"Contract Drilling - Contracts" in this Item I.

                                    EMPLOYEES

        Prior to the last quarter of fiscal 1997, the Company leased its
personnel from a personnel leasing company. In December, 1996, the leasing
contract was terminated and the Company became the employer of the personnel.

        At May 23, 1998, the Company had 161 full-time employees, of whom 135
were paid on an hourly basis and were engaged in operating the Company's
drilling rigs or in other operations. Of the total employees, 13 were
administrative employees and 13 were supervisory. None of the employees are
represented by any union or collective bargaining group, and there is no history
of strikes, slow downs, or other material labor disputes. Management believes
that the Company's relations with its employees are satisfactory.

ITEM 2.        PROPERTIES

        For purposes of property description, see "Contract Drilling - Drilling
Equipment" and "Oil and Gas Operations and Properties" contained in this Part I.
The Company's principal executive office in San Antonio, Texas is maintained in
office space which the Company purchased in September, 1995. The Company also
owns a six-acre tract in Kenedy, Texas utilized as an operating yard.

ITEM 3.        LEGAL PROCEEDINGS

        The Company is currently involved in a lawsuit styled National Energy
Group, Inc. v. South Texas Drilling Company, cause No. 96-98, 357 Judicial
District Court, Willacy County, Texas. This case arose out of a dispute with a
drilling customer over a billing for work performed under a daywork drilling
contract. In the course of drilling the well, some of the Company's equipment
was lost in the hole. Under the terms of the contract, the customer was billed
for the drilling operations and replacement cost of the lost equipment. The
customer has declined to pay the billed amount of $279,000 alleging negligence
and seeking damages in excess of $460,000 plus attorney's fees. A jury trial in
this case commenced in August, 1997. The jury found in favor of the company and
a judgment was entered November 7, 1997, granting the Company $163,000 plus
attorneys' fees of $70,000. The customer filed an appeal of the judgment and at
fiscal year-end, the case was in the early stages of the appeal. On June 10,
1998, the Company received $213,000 from National Energy Group in settlement of
the lawsuit. Per the terms of the settlement each of the parties agrees to
release the other from all claims related to the lawsuit. The Company's accounts
related to this matter will be adjusted in the period of resolution.

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

        During the fiscal year covered by this report, no matter was submitted
to a vote of the Company's security holders through the solicitation of proxies
or otherwise.



                                       -7-

<PAGE>   8


            SOUTH TEXAS DRILLING & EXPLORATION, INC. AND SUBSIDIARIES

                                     PART II

ITEM 5.        MARKET PRICE OF THE COMPANY'S COMMON STOCK AND RELATED SECURITY 
               HOLDER MATTERS

        The initial public offering of the Company's Common Stock occurred on
February 4, 1981, and from that date until August 18, 1981, the Common Stock was
traded in the over-the-counter market. From August 19, 1981 until February 10,
1986, the Company's Common Stock was listed on the American Stock Exchange
(AMEX) (Symbol: SDR). On February 10, 1986, trading of the Company's stock was
discontinued on the AMEX as the Company no longer met the net worth requirement
for listing on the AMEX. At the present time, the Company's Common Stock
(Symbol: STXD) is not traded on a stock exchange. However, the Company's Common
Stock is traded in the "pink sheets". Shareholders interested in trading the
Company's Common Stock should contact their stockbroker or the Company for
further information. In fiscal years prior to 1998, the Company's common stock
was lightly traded. Therefore, the Company reported bid and ask prices rather
than actual stock prices. In fiscal 1998, trading activity in the Company's
common stock became more regular and the stocks' high/low prices are now more
relevant. The following table sets forth for the period indicated quotations
from a marketmaker for the Company's common stock. For fiscal 1998, the table
presents the high and low stock price for each quarter. For fiscal 1997, the
table presents, as in prior years, the bid and ask prices as of the end of each
quarter.

<TABLE>
<CAPTION>
                                                                             OVER-THE-COUNTER
                                                                         -------------------------
                         1998                                            Low                  High
                         ----                                            ---                  ----
<S>                                                                   <C>                    <C>
                         First Quarter                                $0.4400                1.2500
                         Second Quarter                                1.0625                2.1875
                         Third Quarter                                 2.0625                3.7500
                         Fourth Quarter                                1.2500                2.5000
</TABLE>

<TABLE>
<CAPTION>
                         1997                                           Bid                    Ask
                         ----                                           ---                    ---
<S>                                                                   <C>                    <C>
                         First Quarter                                $0.3125                0.6250
                         Second Quarter                                0.3750                0.7500
                         Third Quarter                                 0.4375                0.6250
                         Fourth Quarter                                0.4375                0.7500
</TABLE>

        The above over-the-counter quotations reflect inter-dealer prices,
without retail mark-up, mark-down or commission and may not necessarily
represent actual transactions.

        As of June 5, 1998, there were approximately 1,000 registered
stockholders of Common Stock of the Company.

        The Board of Directors has followed a policy of reinvesting the earnings
of the Company in its business and of not distributing any part thereof as
dividends to shareholders. The Board of Directors has no present intention to
initiate the payment of cash dividends, and future dividends of the Company will
depend upon the earnings, capital requirements and financial condition of the
Company and other relevant factors. Additionally, the Company's debt facility
includes a provision preventing the Company from issuing dividends except for
dividends on the preferred stock issued in fiscal 1998.



                                       -8-

<PAGE>   9


            SOUTH TEXAS DRILLING & EXPLORATION, INC. AND SUBSIDIARIES

ITEM 6.        SELECTED FINANCIAL DATA
               (In thousands, except per share amounts)

<TABLE>
<CAPTION>
                                                                                      Years Ended
                                                                                       March 31,
                                                             -------------------------------------------------------------
                                                             1998          1997          1996           1995          1994
                                                             ----          ----          ----           ----          ----
<S>                                                       <C>             <C>           <C>            <C>           <C>  
Revenues                                                  $17,091         8,503         7,500          5,494         7,050
Earnings before taxes, depreciation,
        depletion and amortization and
        other income (expense)                              2,236         1,175           593            253         1,069
Earnings (loss) before income taxes                           894           597             3           (244)          723
Net earnings (loss) applicable to common
        stockholders                                          722           564             3           (244)          723
Earnings (loss) per common share-basic                       0.13          0.11             -          (0.05)         0.14
Earnings (loss) per common share-diluted                     0.11          0.10             -          (0.05)         0.13

Long-term debt, excluding
        current installments                                2,697         1,220           554             88            91
Shareholders' equity                                        6,816         2,054         1,477          1,541         1,744
Total assets                                               12,502         5,051         4,286          3,473         4,093
Capital expenditures                                        3,561           763           411            755           679
</TABLE>

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

Liquidity

        During the past fifteen years, drilling activity in the oil and gas
industry has been volatile with periods of high activity and other periods of
low activity. In fiscal 1996, drilling activity began to increase. This
increased activity continued through the third quarter of fiscal 1998. During
fiscal 1997, the utilization rate for the Company's rigs was 80 percent while
operating four rigs. In fiscal 1998, the utilization rate decreased to 76
percent while operating up to seven rigs. The actual number of drilling days
increased to 1,684 in fiscal 1998 from 1,175 in fiscal 1997. Drilling rates
charged to customers on drilling contracts in fiscal 1998 showed some increase
over those charged in fiscal 1997. This increase in drilling rates reflects the
increased demand for drilling rigs during the period. At March 31, 1998, the
Company's current ratio was 1.37 compared to 1.02 at March 31, 1997. Working
capital at March 31, 1998 was $1,118,907 compared to $29,166 at March 31, 1997.
This increase was due, in part, to the increased drilling activity and to the
two preferred stock issues in fiscal 1998.

        In June, 1997, the Company financed its purchase of drilling and rig
moving equipment from San Patricio Corporation with $1,050,000 in principal
amount of debt. Incident to this financing the Company obtained more favorable
terms for its debt facility secured by drilling and transportation equipment and
its equipment yard. Under the new terms, the term loan carries an interest rate
of prime plus 2.25% and the revolving loan an interest rate of prime plus 2.25%.
The monthly payments on the new note are $12,500 plus interest. In October,
1997, further financing was secured to purchase additional drilling equipment.
This loan was in the amount of $600,000 and carries an interest rate of prime
plus 2.25%. The monthly payments, based on seven-year amortization, are $7,143
plus interest. Also in October, 1997, the Company secured a $600,000 capital
expenditure line of credit for the purchase of additional drilling equipment.
This line carries an interest rate of prime plus 2.25%. The Company has made two
advances under this line. The monthly payments on these advances, in the amount
of $519,466, are $14,430 plus interest. All these loans are due in June, 1999

                                       -9-

<PAGE>   10


            SOUTH TEXAS DRILLING & EXPLORATION, INC. AND SUBSIDIARIES

and, per the loan agreement, shall be automatically renewed for successive
periods of one year unless paid in full earlier or there is an Event of Default
for which no waiver is obtained from the lender.

        In acquiring the drilling assets of San Patricio Corporation, the
Company also secured $300,000 in seller financing. This loan carries an interest
rate of 10% and is payable in monthly payments of $5,000 plus interest. The loan
is due in June, 2002.

        In March, 1998, the Company purchased additional transportation
equipment. The equipment was purchased through the use of $60,000 in cash and
seller financing of $60,000. The debt is payable in monthly payments of $5,000
plus interest at 8%. The loan is due in April, 1999.

        The ratio of trade accounts receivable to total revenue decreased to
2.2% at the end of fiscal 1998 from 6.8% at the end of fiscal 1997. This
decrease was the result of increased total revenue in fiscal 1998 and a decrease
in outstanding accounts receivable at year end. The ratio of the Company's
shareholders' equity in relation to outstanding debt (vendor and bank notes
payable) improved in fiscal 1998. At March 31, 1997, the ratio of shareholders'
equity to notes payable was 1 to .71. At March 31, 1998, the ratio was 1 to .50.
The increase in shareholders' equity was primarily due to the Company's
profitability and the issuance of preferred stock.

        The Company's liquidity was also affected by an uncollected account
receivable of $279,000 from drilling operations in fiscal 1996. In this case,
the Company drilled a well under a daywork contract. In the course of drilling
the well, some of the Company's equipment was lost in the hole. Under the terms
of the contract, the customer was billed for the drilling operations and the
replacement cost of the lost equipment. The customer filed a lawsuit alleging
negligence, denying responsibility for the $279,000 billed by the Company, and
seeking additional damages of $460,000 plus attorney's fees. Management, which
believes the customer's claim to be without merit, filed a counter-suit seeking
payment in full of the original invoice in the amount of $279,000. In fiscal
1996, an allowance for uncollectible accounts in the amount of $140,000 was
established for this account. A jury trial in this case commenced in August,
1997. The jury found in favor of the Company and a judgment was entered in
November, 1997 granting the Company $163,000 plus attorneys' fees of $70,000.
The customer filed an appeal of the judgment and at fiscal year-end, the case
was in the early stages of the appeal. On June 10, 1998, the Company received
$213,000 from National Energy Group in settlement of the lawsuit. Per the terms
of the settlement each of the parties agrees to release the other from all
claims related to the lawsuit. The Company's accounts related to this matter
will be adjusted in the period of resolution.

        Other significant factors affecting liquidity were problems on a turnkey
contract and expenses incurred while rigs were stacked, primarily in the fourth
quarter of fiscal 1998. The Company encountered problems with the drilling of a
well on a turnkey contract and was required to re-drill the well for the
operator. Because of the problems, the Company incurred additional costs in
attempting to correct the problems and in re-drilling the well. The direct
effect on working capital was a decrease of approximately $368,000. Liquidity
also suffered due to the additional time spent on the well, thereby depriving
the Company of potential drilling revenue from other contracts. During the month
of February, 1998, rig utilization declined significantly due to inclement
weather and to reduced rig demand. While rigs were stacked, the Company elected
to retain the drilling crews and to repair and maintain the rigs in preparation
for drilling activity in the future. In doing so, the Company incurred
approximately $175,000 in costs which could have been deferred to a later
period.

        In April, 1997, the Company issued a new Series A 8% Convertible
Preferred Stock. The issue consisted of 400,000 shares with a redemption value
of $800,000. Dividends payable in respect of Series A 8% convertible Preferred
Stock shall accrue from day to day whether or not earned or declared and shall
be cumulative. Accumulation of dividends on the Series A 8% Convertible
Preferred Stock shall not bear interest. Dividends are payable annually. This
Preferred Stock is convertible into 800,000 shares of Common Stock and one share
of Common Stock for each $.50 of due but unpaid dividends on the Series A 8%
Convertible Preferred Stock. The conversion rate is subject to adjustment on the
third and seventh anniversary dates of issuance, depending on the trading value
of the common stock. The stock is redeemable at the Company's option at or
following the third anniversary of the issuance of such stock provided,

                                      -10-

<PAGE>   11


            SOUTH TEXAS DRILLING & EXPLORATION, INC. AND SUBSIDIARIES

generally, that the price of the Company's common stock equals or exceeds $2.50
per share. The proceeds from the stock were used to reduce trade accounts
payable, bank debt and to acquire drilling equipment. Prior to the issuance of
this new Series A preferred stock, the Company redeemed its previously issued
and outstanding Series A preferred stock consisting of 235,000 shares of stock
with a stated par value of $1.00 per share. The outstanding shares were redeemed
for a cash payment of $75,000.

        In January, 1998, the Company issued a new Series B 8% Convertible
Preferred Stock. The issue consisted of 184,615 shares with a redemption value
of $2,999,994. Dividends payable in respect of Series B 8% convertible Preferred
Stock shall accrue from day to day whether or not earned or declared and shall
be cumulative. Accumulation of dividends on the Series B 8% Convertible
Preferred Stock shall not bear interest. Dividends are payable annually. This
preferred stock is convertible into 923,075 shares of the Company's common stock
and one share of common stock for each $1.62 of due but unpaid dividends. The
conversion rate is subject to adjustment on its third and seventh anniversary
dates of issuance depending on the trading value of the common stock. The stock
is redeemable at the Company's option at or following the first anniversary of
the issuance of such stock provided, generally, that the price of the Company's
common stock equals or exceeds $5.00 per share. The proceeds from the stock have
been and will be used for equipment purchases, debt reduction and working
capital.

Changes in Financial Condition

        During fiscal 1998, the Company had a net increase in property and
equipment of $6,080,000 before accumulated depreciation, depletion and
amortization. This net increase was the product of a write off of $418,000 in
fully depreciated drilling equipment and the expenditure of $6,498,000 for major
repairs and the purchase of additional equipment. Of this amount, $6,154,000 was
attributable to the purchase of drilling equipment, $280,000 to the purchase of
transportation equipment, $59,000 to the purchase or acquisition of oil and gas
properties or interests and $5,000 to the purchase of furniture and fixtures.

        At March 31, 1998, the current portion of long-term debt was $629,000.
Of this amount, $1,000 was owed on oil and gas properties, $613,000 on drilling
equipment and $15,000 on land and buildings and improvements. Trade accounts
payable at March 31, 1998 were $1,650,000 compared to $1,147,000 at March 31,
1997. At March 31, 1998, long-term debt was $2,696,000. Of this amount, $203,000
was owed on land and buildings and equipment; and $2,493,000 on drilling
equipment.

Results of Operations

        Rig utilization rates for the years ended March 31, 1998, 1997 and 1996
were 76%, 80% and 64%, respectively. In fiscal 1998, the Company completed 1,684
drilling days while in fiscal 1997, the Company completed 1,175 drilling days.
This was a 43% increase in number of drilling days in 1998 when the Company
operated up to seven rigs compared to fiscal 1997 when the Company operated four
rigs. This increase reflects the increased demand during the period for drilling
rigs and the increased efforts of the Company's staff to obtain contracts for
the rigs.

        During fiscal 1998, the Company's drilling margin increased when
compared to both fiscal 1997 and fiscal 1996. In fiscal 1998, the drilling
margin was $2,689,711, while in fiscal 1997 and fiscal 1996 it was $1,366,798
and $912,230, respectively. The increase in fiscal 1998 over fiscal 1997 was
principally the result of the 43% increase in the number of drilling days during
fiscal 1998 and the increase in drilling rates charged on contracts. When
compared to drilling revenue, the drilling margin was 16%, 17% and 13% in fiscal
1998, fiscal 1997 and fiscal 1996, respectively. Two significant factors had a
negative impact on the drilling margin in fiscal 1998. The first was problems
with a turnkey contract. Because of problems with the well, the company was
required to re-drill the well for the operator and also incurred additional
costs in attempting to correct the problems on the original job. This resulted
in a loss of approximately $368,000. The second factor affecting the drilling
margin in fiscal 1998 was the significantly reduced rig utilization during the
month of February, 1998. The reduced utilization was caused by inclement weather
and by reduced rig

                                      -11-

<PAGE>   12


            SOUTH TEXAS DRILLING & EXPLORATION, INC. AND SUBSIDIARIES

demand. The Company decided to use the idle time to perform repair and
maintenance activities on the stacked rigs in preparation for drilling activity
in the future. These costs approximated $175,000.

        The Company markets its rigs to a number of customers. In fiscal 1998,
the Company drilled for 37 different customers. In fiscal 1997, the Company
drilled for 32 different customers. Of the 37 customers in fiscal 1998, 26 were
customers the Company had not drilled for in fiscal 1997. These 26 customers
accounted for over 47% of the Company's drilling revenue in fiscal 1998. In
fiscal 1996, three customers accounted for 34% of total drilling revenue. In
fiscal 1997, three customers accounted for 24% of total drilling revenue. In
fiscal 1998, two customers accounted for 32% of total drilling revenue. Of these
two customers, none was included in the top three customers of fiscal 1997. The
loss of any of these customers could have a material adverse effect on the
Company's business resulting from the time required to find other users of the
rig concerned.

        Oil and gas revenue for fiscal 1998 decreased by $90,912 from fiscal
1997. The decrease was primarily due to a 15% decrease in the average price per
barrel of oil, a 3% decrease in the average price per MCF of gas, a 12% decrease
in oil production and a 17% decrease in gas production. In fiscal 1998, the
Company's average production cost per unit in barrel equivalents increased 16%
from fiscal 1997. This compares with a 36% increase in the average production
cost for 1997 compared to 1996.

        Depreciation, depletion and amortization expense in fiscal 1998
increased to $1,114,866 from $623,614 in fiscal 1997. Depreciation expense
increased to $988,210 in fiscal 1998 from $475,135 in fiscal 1997. This increase
was the result of equipment purchased in late fiscal 1997 and fiscal 1998.
Depletion expense decreased to $126,656 in fiscal 1998 compared to $148,479 in
fiscal 1997. Production decreased to 17,915 barrel equivalents in fiscal 1998
from 21,001 barrel equivalents in fiscal 1997. In fiscal 1997 and fiscal 1998,
the Company was not subject to the ceiling test limitation as it applies to oil
and gas properties. Under such a test, the depleted carrying value of the
Company's oil and gas properties is compared to the net present worth of
estimated future oil and gas revenues based on period end prices, discounted at
10%. If the depleted carrying value exceeds the discounted net present worth of
estimated future oil and gas revenues, the carrying value must be written down.
Conversely, if the discounted net present value exceeds the carrying value of
the properties, no adjustment is made to the carrying value, even if there had
been a write-off in prior years.

        General and administrative expenses increased from $549,656 in fiscal
1997 to $712,485 in fiscal 1998. The primary components of the change in general
administrative expenses were increases in payroll costs, consulting fees and
insurance.

        Earnings from operations increased to $1,121,336 in fiscal 1998 from
$551,333 in fiscal 1997. Of the $1,121,336, $1,018,439 was contributed by
drilling operations and $102,897 by oil and gas operations.

        The exploration, development, production and processing of oil and gas,
including the disposal of produced water, are subject to various federal and
state laws and regulations designed to protect the environment. Compliance with
these regulations is part of the Company's day-to-day operating procedures. The
Company is not aware of any potential clean-up obligations which would have a
material effect on its financial condition or results of operations.

Forward Looking Information

        This Form 10K contains certain "forward-looking" statements as such term
is defined in The Private Securities Litigation Reform Act of 1995 and
information relating to the Company and its subsidiaries that are based on the
beliefs of the Company's management. When used in this report, the words
"anticipate," "believe," "estimate," "expect" and "intend" and words or phrases
of similar import, as they relate to the Company or its subsidiaries or Company
management, are intended to identify forward-looking statements. Such statements
reflect the current risks, uncertainties and assumptions related to certain
factors including, without limitation, competitive factors, general economic
conditions, customer relations, relationships with vendors, the interest rate
environment, governmental regulation and supervision, seasonality, distribution
networks, product introductions and acceptance, technological change, changes in
industry

                                      -12-

<PAGE>   13


            SOUTH TEXAS DRILLING & EXPLORATION, INC. AND SUBSIDIARIES

practices, one-time events and other factors described herein and in other
filings made by the Company with the Securities and Exchange Commission. Based
upon changing conditions, should any one or more of these risks or uncertainties
materialize, or should any underlying assumptions prove incorrect, actual
results may vary materially from those described herein as anticipated,
believed, estimated, expected, or intended. The Company does not intend to
update these forward-looking statements.

Accounting Matters

        In June, 1997, the Financial Accounting Standards Board (FASB) issued
Statement of Financial Accounting Standards (SFAS) No. 130, "Reporting
Comprehensive Income." This statement establishes standards for reporting
comprehensive income and its components in a full set of general-purpose
financial statements. SFAS No. 130 requires that all items that are required to
be recognized under accounting standards as components of comprehensive income
be reported in a financial statement displayed with the same prominence as other
financial statements. SFAS No. 130 is effective for fiscal years beginning after
December 15, 1997. The Company believes that the disclosure of comprehensive
income in accordance with the provisions of SFAS No. 130 will not materially
impact the manner of presentation of its financial statements as currently and
previously reported.

        In June, 1997, the FASB issued SFAS No. 131, "Disclosures about Segments
of an Enterprise and Related Information." This statement establishes standards
for the way that public business enterprises report information about operating
segments in annual financial statements and requires that those enterprises
report selected information about operating segments in annual financial
statements and requires that those enterprises report selected information about
operating segments in interim financial reports issued to shareholders. It also
establishes standards for related disclosures about products and services,
geographic areas and major customers. SFAS No. 131 is effective for fiscal years
beginning after December 15, 1997. The Company believes that the reporting
requirements regarding segments of an enterprise will not materially impact the
manner of presentation of its financial statements.

Year 2000

        In fiscal 1998, the Company began the process of identifying, evaluating
and implementing changes to computer programs necessary to address the year 2000
issue. This issue affects computer systems that have time-sensitive programs
that may not properly recognize the year 2000. This could result in system
failures or miscalculations. The Company is currently addressing its internal
year 2000 issue with modifications to existing programs and conversions to new
programs. The Company does not expect to incur any material expenses relating to
year 2000 compliance.

                                      -13-

<PAGE>   14


            SOUTH TEXAS DRILLING & EXPLORATION, INC. AND SUBSIDIARIES

ITEM 8.        FINANCIAL STATEMENTS AND SUPPLEMENTARY DATA

                          Independent Auditors' Report


The Board of Directors
South Texas Drilling & Exploration, Inc.:

        We have audited the consolidated balance sheets of South Texas Drilling
& Exploration, Inc. and subsidiaries as of March 31, 1998 and 1997 and the
related consolidated statements of operations, shareholders' equity and cash
flows for each of the years in the three-year period ended March 31, 1998. In
connection with our audits of the consolidated financial statements, we also
have audited the financial statement schedule (Schedule II) for each of the
years in the three-year period ended March 31, 1998. These consolidated
financial statements and financial statement schedule are the responsibility of
the Company's management. Our responsibility is to express an opinion on these
consolidated financial statements and financial statement schedule 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
misstatements. 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 consolidated financial statements referred to above
present fairly, in all material respects, the financial position of South Texas
Drilling & Exploration, Inc. and subsidiaries as of March 31, 1998 and 1997, and
the results of their operations and their cash flows for each of the years in
the three-year period ended March 31, 1998, in conformity with generally
accepted accounting principles. Also in our opinion, the related financial
statement schedule, when considered in relation to the basic consolidated
financial statements taken as a whole, presents fairly, in all material
respects, the information set forth therein.




                                               KPMG Peat Marwick LLP




San Antonio, Texas
June 16, 1998

                                      -14-

<PAGE>   15


            SOUTH TEXAS DRILLING & EXPLORATION, INC. AND SUBSIDIARIES

                           CONSOLIDATED BALANCE SHEETS


<TABLE>
<CAPTION>
Assets
- ------
                                                                                                March 31,
                                                                                     -------------------------------
                                                                                         1998                 1997
                                                                                     -----------           ---------
<S>                                                                                  <C>                   <C>    
Current assets:
    Cash and cash equivalents                                                        $ 2,586,710             407,755
    Receivables:
       Trade, net of allowance for
         doubtful accounts of $140,000 in
         1998 and 1997                                                                   372,731             577,228
       Contract drilling in progress                                                     965,677             593,162
       Employees and officers                                                             68,191              65,449
    Prepaid expenses                                                                     114,020             162,213
                                                                                     -----------           ---------
       Total current assets                                                            4,107,329           1,805,807
                                                                                     -----------           ---------

Property and equipment, at cost:
    Drilling rigs and equipment                                                       13,784,597           8,048,115
    Oil and gas properties, based on full cost
       accounting method                                                               1,808,832           1,749,809
    Transportation, office, land and other                                             1,374,762           1,090,011
                                                                                     -----------           ---------
                                                                                      16,968,191          10,887,935

    Less accumulated depreciation, depletion and
       amortization                                                                    8,573,771           7,642,458
                                                                                     -----------           ---------
       Net property and equipment                                                      8,394,420           3,245,477
                                                                                     -----------           ---------

                                                                                     $12,501,749           5,051,284
                                                                                     ===========          ==========
</TABLE>




See accompanying notes to consolidated financial statements.
                                                                     (Continued)

                                      -15-

<PAGE>   16


            SOUTH TEXAS DRILLING & EXPLORATION, INC. AND SUBSIDIARIES

                     CONSOLIDATED BALANCE SHEETS (Continued)

<TABLE>
<CAPTION>
Liabilities and Shareholders' Equity
- ------------------------------------
                                                                                                       March 31,
                                                                                            ------------------------------
                                                                                                1998              1997
                                                                                            ------------      ------------
<S>                                                                                         <C>               <C>
Current liabilities:
    Note payable                                                                            $     60,000                --
    Current installments of long-term
       debt                                                                                      628,816           240,756
    Note payable to employee                                                                      17,198            20,638
    Accounts payable                                                                           1,649,958         1,146,982
    Accrued expenses:
       Payroll and payroll taxes                                                                 279,416           174,772
       Dividends payable                                                                         108,566                --
       Other                                                                                     244,468           193,493
                                                                                            ------------      ------------
         Total current liabilities                                                             2,988,422         1,776,641
Note payable to employee, interest at 7%                                                              --            17,198
Long-term debt, less current installments
    and note payable to employee                                                               2,696,919         1,202,905
                                                                                            ------------      ------------
         Total liabilities                                                                     5,685,341         2,996,744
                                                                                            ------------      ------------
Shareholders' equity:
    Preferred stock, Series A,
       noncumulative dividend at 8% of
       liquidation preference value, $1.00
       par value. Authorized 1,000,000
       shares; issued and outstanding no shares
       at March 31, 1998 and 235,000 shares
       at March 31, 1997. Liquidation
       preference value of $4.26 per share
       ($1,000,000); redeemable at the
       Company's option at $1.00 per share 
       Redeemed in 1998                                                                               --           235,000
    Preferred stock, Series A, 8%, cumulative,
       convertible, $2.00 redemption and liquidation
       value.  Authorized 400,000 shares; issued
       and outstanding 400,000 shares at  March 31,
       1998 and no shares at March 31, 1997                                                      800,000                --
    Preferred stock, Series B, 8%, cumulative,
       convertible, $16.25 redemption and liquidation
       value.  Authorized 184,615 shares; issued and
       outstanding 184,615 shares at March 31, 1998
       and no shares at March 31, 1997                                                         2,999,994                --
    Common stock, $.10 par value 
       Authorized 15,000,000 shares; issued
       and outstanding 6,171,964 shares at
       March 31, 1998 and 5,655,333 shares
       at March 31, 1997                                                                         617,196           565,533
    Additional paid-in capital                                                                16,337,006        15,914,169
    Accumulated deficit                                                                      (13,800,883)      (14,523,257)
                                                                                            ------------      ------------
                                                                                               6,953,313         2,191,445
Less treasury stock, 339,767 shares at March 31,
    1998 and March 31, 1997, at cost                                                            (136,905)         (136,905)
                                                                                            ------------      ------------
         Total shareholders' equity                                                            6,816,408         2,054,540
                                                                                            ------------      ------------
                                                                                            $ 12,501,749         5,051,284
                                                                                            ============      ============
</TABLE>

See accompanying notes to consolidated financial statements.

                                      -16-

<PAGE>   17


            SOUTH TEXAS DRILLING & EXPLORATION, INC. AND SUBSIDIARIES



                      CONSOLIDATED STATEMENTS OF OPERATIONS


<TABLE>
<CAPTION>
                                                                 Years Ended March 31,
                                                   ------------------------------------------------
                                                       1998              1997              1996
                                                   ------------      ------------      ------------
<S>                                                <C>                  <C>               <C>      
Revenues:
    Contract drilling                              $ 16,655,642         7,968,191         6,989,972
    Oil and gas                                         310,630           401,542           380,110
    Administrative overhead and other                   124,329           133,581           129,572
                                                   ------------      ------------      ------------
       Total operating revenues                      17,090,601         8,503,314         7,499,654
                                                   ------------      ------------      ------------

Costs and expenses:
    Contract drilling                                13,965,931         6,601,393         6,077,742
    Oil and gas                                         175,983           177,318           169,008
    Depreciation, depletion and
       amortization                                   1,114,866           623,614           576,894
    General and administrative                          712,485           549,656           520,402
    Doubtful accounts                                        --                --           140,000
                                                   ------------      ------------      ------------
       Total operating costs and
         expenses                                    15,969,265         7,951,981         7,484,046
                                                   ------------      ------------      ------------
         Earnings  from operations                    1,121,336           551,333            15,608
                                                   ------------      ------------      ------------

Other income (expense):
    Interest expense                                   (306,279)         (176,801)         (108,121)
    Interest income                                      50,676            15,295             5,443
    Gain on sale of assets                               27,895             6,862           273,251
    Provision for litigation settlement                      --           200,000          (200,000)
    Minority interest in operation
       of partnership                                        --                --            16,591
                                                   ------------      ------------      ------------
       Total other income (expense)                    (227,708)           45,356           (12,836)
                                                   ------------      ------------      ------------

         Earnings before income taxes                   893,628           596,689             2,772
Income taxes                                             62,688            33,000                --
                                                   ------------      ------------      ------------
            Net earnings                                830,940           563,689             2,772
Preferred stock dividend requirement                    108,566                --                --
                                                   ------------      ------------      ------------
Net earnings applicable to common stockholders     $    722,374           563,689             2,772
                                                   ============      ============      ============




Earnings per common share-Basic                    $       0.13              0.11                --
                                                   ============      ============      ============

Earnings per common share - Diluted                $       0.11              0.10                --
                                                   ============      ============      ============

Weighted average number of shares
    outstanding-Basic                                 5,714,535         5,306,158         5,178,424
                                                   ============      ============      ============

Weighted average number of shares
     outstanding-Diluted                              7,793,207         5,724,440         5,279,576
                                                   ============      ============      ============
</TABLE>


See accompanying notes to consolidated financial statements.

                                      -17-

<PAGE>   18


            SOUTH TEXAS DRILLING & EXPLORATION, INC. AND SUBSIDIARIES


                 CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY

<TABLE>
<CAPTION>
                                            Shares                               Amount           Additional
                                  ---------------------------     ---------------------------       Paid-in
                                    Common         Preferred        Common         Preferred        Capital
                                  -----------     -----------     -----------     -----------     -----------
<S>                                 <C>               <C>         <C>                 <C>          <C>       
Balance at March 31, 1995           5,408,000         235,000     $   540,800         235,000      15,854,757
Issuance of common stock
    for bonus to employee              50,000              --           5,000              --           6,500
Issuance of common stock
    for fees to directors               8,000              --             800              --           1,040
Issuance of common stock
    for exercise of warrant            35,000              --           3,500              --           6,300
Issuance of common stock
    for exercise of option            100,000              --          10,000              --          30,630
Acquisition of 319,767 shares
    of common stock in
    exchange for equipment                 --              --              --              --              -- 
Net earnings                               --              --              --              --              -- 
                                  -----------     -----------     -----------     -----------     -----------
Balance at March 31, 1996           5,601,000         235,000         560,100         235,000      15,899,227
Acquisition of 20,000 shares               --              --              --              --              -- 
Issuance of common stock
    as compensation                    53,333              --           5,333              --          14,667
Issuance of common stock
    for exercise of option              1,000              --             100              --             275
Net earnings                               --              --              --              --              -- 
                                  -----------     -----------     -----------     -----------     -----------
Balance as of March 31, 1997        5,655,333         235,000     $   565,533         235,000      15,914,169

<CAPTION>
                                                                        Total
                                  Accumulated        Treasury       Shareholders'
                                    Deficit           Stock             Equity
                                  -----------      -----------      -------------
<S>                               <C>              <C>                <C>      
Balance at March 31, 1995         (15,089,718)              --        1,540,839
Issuance of common stock
    for bonus to employee                  --               --           11,500
Issuance of common stock
    for fees to directors                  --               --            1,840
Issuance of common stock
    for exercise of warrant                --               --            9,800
Issuance of common stock
    for exercise of option                 --               --           40,630
Acquisition of 319,767 shares
    of common stock in
    exchange for equipment                 --         (129,905)        (129,905)
Net earnings                            2,772               --            2,772
                                  -----------      -----------      -----------
Balance at March 31, 1996         (15,086,946)        (129,905)       1,477,476
Acquisition of 20,000 shares               --           (7,000)          (7,000)
Issuance of common stock
    as compensation                        --               --           20,000
Issuance of common stock
    for exercise of option                 --               --              375
Net earnings                          563,689               --          563,689
                                  -----------      -----------      -----------
Balance as of March 31, 1997      (14,523,257)        (136,905)       2,054,540
</TABLE>



          See accompanying notes to consolidated financial statements
                                                                     (Continued)
                                      -18-

<PAGE>   19


            SOUTH TEXAS DRILLING & EXPLORATION, INC. AND SUBSIDIARIES


           CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (continued)

<TABLE>
<CAPTION>
                                            Shares                           Amount                Additional
                                 ----------------------------      ---------------------------       Paid-in
                                   Common          Preferred         Common         Preferred        Capital
                                 -----------      -----------      -----------     -----------     -----------
<S>                                <C>                <C>          <C>               <C>            <C>       
Balance as of March 31, 1997       5,655,333          235,000      $   565,533         235,000      15,914,169
Issuance of common stock
    as compensation                   92,631               --            9,263              --          45,737
Issuance of common stock
    for equipment                    400,000               --           40,000              --         260,000
Purchase of preferred stock               --         (235,000)              --        (235,000)        160,000 
Issuance of new series A
    preferred stock                       --          400,000               --         800,000              -- 
Issuance of series B
    preferred stock                       --          184,615               --       2,999,994              -- 
Fee paid on preferred stock
    transaction                           --               --               --              --         (55,000)
Issuance of common stock
    for exercise of options           24,000               --            2,400              --          12,100
Net earnings                              --               --               --              --              -- 
Preferred stock dividend                  --               --               --              --              -- 
                                 -----------      -----------      -----------     -----------     -----------
Balance as of March 31, 1998       6,171,964          584,615      $   617,196       3,799,994      16,337,006
                                 ===========      ===========      ===========     ===========     ===========
<CAPTION>

                                                                       Total
                                 Accumulated        Treasury       Shareholders'
                                   Deficit           Stock             Equity
                                 -----------      -----------      -------------
<S>                              <C>               <C>                <C>      
Balance as of March 31, 1997     (14,523,257)        (136,905)       2,054,540
Issuance of common stock
    as compensation                       --               --           55,000
Issuance of common stock
    for equipment                         --               --          300,000
Purchase of preferred stock               --               --          (75,000)
Issuance of new series A
    preferred stock                       --               --          800,000
Issuance of series B
    preferred stock                       --               --        2,999,994
Fee paid on preferred stock
    transaction                           --               --          (55,000)
Issuance of common stock
    for exercise of options               --               --           14,500
Net earnings                         830,940               --          830,940
Preferred stock dividend            (108,566)              --         (108,566)
                                 -----------      -----------      -----------
Balance as of March 31, 1998     (13,800,883)        (136,905)       6,816,408
                                 ===========      ===========      ===========
</TABLE>


See accompanying notes to consolidated financial statements

                                      -19-

<PAGE>   20


            SOUTH TEXAS DRILLING & EXPLORATION, INC. AND SUBSIDIARIES

                      CONSOLIDATED STATEMENTS OF CASH FLOWS


<TABLE>
<CAPTION>
                                                           Years Ended March 31,
                                              ---------------------------------------------
                                                  1998             1997            1996
                                              -----------      -----------      -----------
<S>                                           <C>              <C>              <C>
Cash flows from operating activities:
    Net earnings                              $   830,940          563,689            2,772
    Adjustments to reconcile net earnings
    to net cash provided by
    operating activities:
       Depreciation, depletion and
         amortization                           1,114,866          623,614          576,894
       Provision for doubtful accounts                 --               --          140,000
       Provision for litigation                        --         (200,000)         200,000
       Stock issued to directors and
         employees                                  4,583               --           13,340
       Gain on sale of assets                     (27,895)          (6,862)        (273,251)
       Minority interest in operations of
         partnership                                   --               --          (16,591)
       Changes in current assets and
       liabilities:
         Receivables                             (170,760)        (342,589)        (311,150)
         Prepaid expenses                          48,193         (114,197)          11,990
         Accounts payable                         502,976         (108,523)         491,914
         Accrued expenses                         206,036           36,928          132,997
                                              -----------      -----------      -----------

            Net cash provided by
               operating activities           $ 2,508,939          452,060          968,915
                                              -----------      -----------      -----------
</TABLE>


See accompanying notes to consolidated financial statements
                                                                     (Continued)

                                      -20-

<PAGE>   21


            SOUTH TEXAS DRILLING & EXPLORATION, INC. AND SUBSIDIARIES

                CONSOLIDATED STATEMENTS OF CASH FLOWS (Continued)


<TABLE>
<CAPTION>
                                                                         Years Ended March 31,
                                                              ---------------------------------------------
                                                                  1998             1997             1996
                                                              -----------      -----------      -----------
<S>                                                           <C>              <C>              <C>
Cash flows from financing activities:
    Proceeds from notes payable                               $   171,236        1,603,724        1,425,707
    Purchase of preferred stock                                   (75,000)              --               --
    Purchase of treasury stock                                         --           (7,000)              --
    Proceeds from preferred stock                               3,744,994               --               --
    Proceeds from exercise of warrants                                 --               --            9,800
    Proceeds from exercise of options                              14,500              375           37,500
    Payments of debt                                             (888,257)      (1,213,559)      (2,078,094)
                                                              -----------      -----------      -----------
       Net cash provided (used) in financing activities         2,967,473          383,540         (605,087)
                                                              -----------      -----------      -----------

Cash flows from investing activities:
    Purchase of property and equipment                         (3,561,035)        (762,946)        (410,757)
    Proceeds from sale of property and
       equipment                                                  263,578            9,533          150,681
                                                              -----------      -----------      -----------

       Net cash (used) in investing activities                 (3,297,457)        (753,413)        (260,076)
                                                              -----------      -----------      -----------

Net increase in cash and cash
    equivalents                                                 2,178,955           82,187          103,752

Beginning cash and cash equivalents                               407,755          325,568          221,816
                                                              -----------      -----------      -----------

Ending cash and cash equivalents                              $ 2,586,710          407,755          325,568
                                                              ===========      ===========      ===========


Supplementary disclosure:
    Interest paid                                             $   307,257          187,441          101,289
    Notes payable issued for equipment and
       oil and gas properties                                   1,438,458          116,075          809,266
    Treasury stock received for drilling equipment                     --               --          129,905
    Common stock issued for accrued compensation                   55,000           20,000               --
    Reimbursement receivable for prior litigation payment              --           90,000               --
    Common stock issued for San Patricio Corporation
       acquisition                                                300,000               --               --
    Notes payable issued for San Patricio Corporation
       acquisition                                              1,200,000               --               --
</TABLE>



See accompanying notes to consolidated financial statements.

                                      -21-

<PAGE>   22


            SOUTH TEXAS DRILLING & EXPLORATION, INC. AND SUBSIDIARIES

                   Notes to Consolidated Financial Statements


(1)    Organization and Summary of Significant Accounting Policies

         Business and Principles of Consolidation

               The Company provides land contract drilling services for the oil
         and gas industry, primarily in southern Texas, and engages in oil and
         gas exploration and development activity for its own account. The
         Company's main focus is considered to be its land contract drilling
         services. The oil and gas operations contributed an immaterial amount
         towards the Company's gross revenues in fiscal 1998 and constitute an
         insignificant amount of its total assets, therefore, disclosure of
         fiscal 1998 oil and gas information has been omitted. The consolidated
         financial statements include the accounts of the Company, its
         wholly-owned subsidiaries and its limited partnership interest through
         December, 1995. All significant intercompany accounts and transactions
         have been eliminated in consolidation.

               The financial statements have been prepared in accordance with
         generally accepted accounting principles. In preparing the financial
         statements, management is required to make estimates and assumptions
         that affect the reported amounts of assets and liabilities as of the
         dates of the balance sheets and income and expenses for the periods.
         Actual results could differ significantly from those estimates.
         Material estimates that are particularly susceptible to significant
         changes in the near term relate to the determination of depreciation,
         depletion and amortization expense.

         Reclassifications

               Certain reclassifications of prior period amounts have been made
         to conform with the current period presentation.

         Income Taxes

               The Company files a consolidated Federal income tax return with
         its subsidiaries using a December 31 year-end.

               Pursuant to Statement of Financial Accounting Standards No. 109,
         "Accounting for Income Taxes", the Company follows the asset and
         liability method of accounting for income taxes under which deferred
         tax assets and liabilities are recognized for the future tax
         consequences attributable to differences between the financial
         statement carrying amounts of existing assets and liabilities and their
         respective tax bases. Deferred tax assets and liabilities are measured
         using enacted tax rates expected to apply to taxable income in the
         years in which those temporary differences are expected to be recovered
         or settled. Under Statement 109, the effect on deferred tax assets and
         liabilities of a change in tax rates is recognized in income in the
         period that includes the enactment date.

         Earnings (Loss) Per Common Share

               In February 1997, the Financial Accounting Standards Board issued
         SFAS No. 128 "Earnings per Share," which establishes standards for
         computing and presenting earnings per share. This Standard, effective
         for financial statements issued for periods ending after December 15,
         1997, replaces the presentation of primary earnings per share with a
         presentation of basic earnings per share. In addition, this standard
         requires dual presentation of basic and diluted earnings per share on
         the face of the statement of operations. This Statement requires
         restatement of all prior period EPS data presented. All prior-period
         earnings per share data presented

                                                                     (Continued)
                                      -22-

<PAGE>   23


            SOUTH TEXAS DRILLING & EXPLORATION, INC. AND SUBSIDIARIES

                   Notes to Consolidated Financial Statements


         in the accompanying consolidated financial statements has been 
         restated to conform to the requirements of SFAS No. 128.

               The following table presents a reconciliation of the numerators
         and denominators of the basic EPS and diluted EPS comparisons as
         required by FAS 128:

<TABLE>
<CAPTION>
                                                                Year Ended
                                                              March 31, 1998
                                                  --------------------------------------
                                                               Weighted Avg.
                                                    Income         Shares      Per-share
                                                  (Numerator)  (Denominator)    Amount
                                                  -----------  -------------   ---------
<S>                                               <C>            <C>           <C>      
Net Earnings                                      $  830,940            
Less: Preferred stock dividends                      108,566            
                                                  ----------
Income available to common stockholders-basic        722,374     5,714,535     $    0.13
                                                                               =========
Effect of dilutive securities
Warrants                                                           123,306            
Options                                                          1,008,686            
Preferred stock                                      108,566       946,680
                                                  ----------     ---------

Income available to common stockholders
       and assumed conversions-diluted            $  830,940     7,793,207     $    0.11
                                                  ==========     =========     =========
</TABLE>

<TABLE>
<CAPTION>
                                                                Year Ended
                                                              March 31, 1997
                                                  --------------------------------------
                                                               Weighted Avg.
                                                    Income         Shares      Per-share
                                                  (Numerator)  (Denominator)    Amount
                                                  -----------  -------------   ---------
<S>                                               <C>            <C>           <C>      
Net earnings                                      $ 563,689

Income available to common stockholders-basic       563,689     5,306,158       $   0.11
                                                                                ========
Effect of dilutive securities
Warrants                                                           95,059
Options                                                  --       323,223
                                                  ---------      ---------      

Income available to common stockholders
       and assumed conversions-diluted            $ 563,689     5,724,440       $   0.10
                                                  =========     =========       ========
</TABLE>




                                                                     (Continued)
                                      -23-

<PAGE>   24


           SOUTH TEXAS DRILLING & EXPLORATION, INC. AND SUBSIDIARIES

                   Notes to Consolidated Financial Statements


<TABLE>
<CAPTION>

                                                                                         Year Ended
                                                                                        March 31, 1996
                                                                       ----------------------------------------------
                                                                                         Weighted Avg.
                                                                         Income             Shares          Per-share
                                                                       (Numerator)       (Denominator)        Amount
                                                                       -----------       -------------      ---------
<S>                                                                   <C>                <C>                <C>
Net Earnings                                                             $   2,772
                                                                       -----------
Income available to common stockholders-basic                                2,772           5,178,424        $    --
                                                                                                            =========
Effect of dilutive securities
Warrants                                                                                        81,885
Options                                                                         --              19,267
                                                                       -----------         ------------

Income available to common stockholders
       and assumed conversions-diluted                                   $   2,772            5,279,576       $    --
                                                                       ===========         ============     =========
</TABLE>


         Stock-Based Compensation

               On April 1, 1996, the Company adopted SFAS No. 123, "Accounting
         for Stock-Based Compensation." This SFAS allows a Company to adopt a
         fair value based method of accounting for a stock-based employee
         compensation plan or to continue to use the intrinsic value based
         method of accounting prescribed by Accounting Principles Board Opinion
         No. 25, "Accounting for Stock Issued to Employees." The Company has
         chosen to continue to account for stock-based compensation under the
         intrinsic value method. Under this method, the Company records no
         compensation expense for stock options granted when the exercise price
         of options granted is equal to the fair market value of the Company's
         common stock on the date of grant. The pro forma effects of adoption of
         SFAS No. 123 is disclosed in footnote 4 in the Notes to Consolidated
         Financial Statements.

         Contract Drilling in Progress

               Contract drilling revenues are earned on footage, daywork and
         turnkey contracts and such revenues and related costs are included in
         the determination of earnings as work progresses. Contract drilling in
         progress consists of revenues earned on contracts which have not yet
         been billed.

         Prepaid Expenses

               Prepaid expenses include loan fees which are amortized over the
         life of the debt.

         Property and Equipment

               Oil and gas producing activities are accounted for using the full
         cost method. Under the full cost method, all costs incurred in the
         acquisition, exploration and development of all oil and gas properties,
         including surrendered and abandoned leaseholds, delay lease rentals and
         dry hole costs, are capitalized. All costs related to production,
         general corporate overhead and other similar activities are expensed in
         the period incurred.

               Depletion of oil and gas properties is provided by the unit of
         production method based on the Company's interest in the aggregated,
         estimated recoverable reserves of all properties. Depletion includes a
         ceiling

                                                                    (Continued)
                                    -24-

<PAGE>   25


            SOUTH TEXAS DRILLING & EXPLORATION, INC. AND SUBSIDIARIES

                   Notes to Consolidated Financial Statements


         limitation adjustment required under the full cost method of
         accounting. The ceiling limitation adjustment is applicable when the
         carrying value of oil and gas properties exceeds the discounted net
         present worth of estimated future cash flows on those properties based
         on prices at the end of the period.

               Depreciation of drilling, transportation and other equipment is
         provided using the straight-line method over estimated useful lives
         ranging from three to ten years.

               Maintenance and repairs are charged to operations; renewals and
         betterments are charged to appropriate property and equipment accounts.

               Long -lived assets and intangible assets are reviewed for
         impairment whenever events or circumstances provide evidence that
         suggests that the carrying amount of the asset may not be recovered.

         Cash Equivalents

               For purposes of the statements of cash flows, the Company
         considers all highly liquid debt instruments purchased with a maturity
         of three months or less to be cash equivalents. At March 31, 1998 and
         1997, cash includes a restricted account in the amount of $106,275 and
         $102,629, respectively.

         New Accounting Pronouncements

         Comprehensive Income

               In June, 1997, the Financial Accounting Standards Board (FASB)
         issued Statement of Financial Accounting Standards (SFAS) No. 130,
         "Reporting Comprehensive Income." This statement establishes standards
         for reporting comprehensive income and its components in a full set of
         general-purpose financial statements. SFAS No. 130 requires that all
         items that are required to be recognized under accounting standards as
         components of comprehensive income be reported in a financial statement
         displayed with the same prominence as other financial statements. SFAS
         No. 130 is effective for fiscal years beginning after December 15,
         1997. The Company believes that the disclosure of comprehensive income
         in accordance with the provisions of SFAS No. 130 will not materially
         impact the manner of presentation of its financial statements as
         currently and previously reported.

         Segment Reporting

               In June, 1997, the FASB issued SFAS No. 131, "Disclosures about
         Segments of an Enterprise and Related Information." This statement
         establishes standards for the way that public business enterprises
         report information about operating segments in annual financial
         statements and requires that those enterprises report selected
         information about operating segments in annual financial statements and
         requires that those enterprises report selected information about
         operating segments in interim financial reports issued to shareholders.
         It also establishes standards for related disclosures about products
         and services, geographic areas and major customers. SFAS No. 131 is
         effective for fiscal years beginning after December 15, 1997. The
         Company believes that the reporting requirements regarding segments of
         an enterprise will not materially impact the manner of presentation of
         its financial statements.




                                                                     (Continued)
                                      -25-

<PAGE>   26


            SOUTH TEXAS DRILLING & EXPLORATION, INC. AND SUBSIDIARIES

                   Notes to Consolidated Financial Statements


(2)    Notes Payable and Long-term Debt

               Notes payable and long-term debt of the Company are described
below:

<TABLE>
<CAPTION>

                                                                                                     March 31,
                                                                                            --------------------------
                                                                                              1998               1997
                                                                                            --------            ------
<S>                                                                                         <C>                 <C>
         Note payable to employee for unpaid compensation,
         due in monthly payments of $1,720 plus interest at
         7.0%, due in January, 1999.                                                        $ 17,198            37,836

         Note payable to seller, secured by transportation
         equipment, due in monthly payments of $5,000 plus
         interest at 8%, due in April, 1999                                                   60,000                --

         Note payable, secured by a vehicle, due in monthly
         payments of $380 including interest at 10.9%, due
         in January, 2000.  Paid in 1998.                                                         --            11,047

         Note payable, secured by a vehicle, due in monthly
         payments of $426 including interest at 12.35%,
         due in June, 1999.  Paid in 1998                                                         --             9,676

         Note payable, secured by a vehicle, due in monthly
         payments of $498 including interest at 9.7%, due
         in June, 1998.  Paid in 1998.                                                            --             6,566

         Note payable, secured by a vehicle, due in monthly
         payments of $393 including interest at 9.25%, due
         in July, 2000.  Paid in 1998.                                                            --            13,469

         Note payable to bank, secured by land and improvements, due in monthly
         payments of $1,900 including interest at the bank's prime rate (9.50%
         at March 31, 1998) plus
         0.5%, due in September, 2005. (note b)                                              110,617           121,595

         Note payable to Small Business Administration, secured by second lien
         on land and improvements, due in monthly payments of $921 including
         interest
         at 6.713% due in November, 2015. (note b)                                           106,805           109,885

         Note payable to bank, secured by oil and gas properties, interest at
         the bank's prime rate (9.50% at March 31, 1998)
         plus 1%, due January, 1999. (note a)                                                 1,000            85,113


</TABLE>

                                                                     (Continued)
                                      -26-


<PAGE>   27


            SOUTH TEXAS DRILLING & EXPLORATION, INC. AND SUBSIDIARIES

                   Notes to Consolidated Financial Statements

<TABLE>
<CAPTION>

                                                                                                    March 31,
                                                                                         -----------------------------
                                                                                             1998              1997
                                                                                         -----------        ----------
         <S>                                                                             <C>                <C>
         Note payable, secured by drilling equipment, transportation equipment,
         land and improvements, due in monthly payments of $14,881 plus interest
         at prime (8.5% at March 31, 1998)
         plus 2.25%, due June, 1999.  (note c)                                               907,738         1,086,310

         Note payable to seller, secured by drilling equipment, due in monthly
         installments of $5,000 plus interest at 10%, due in
         June, 2002.                                                                         255,000                --

         Notes payable, secured by drilling equipment, transportation equipment,
         land and improvements, due in monthly payments of $19,643 plus interest
         at prime (8.5% at March 31, 1998)
         plus 2.25%, due June, 1999. (note d)                                              1,482,143                --

         Notes payable, secured by drilling equipment, transportation equipment,
         land and improvements, due in monthly payments of $14,430 plus interest
         at prime (8.5% at March 31, 1998)
         Plus 2.25%, due June, 1999. (note e)                                                462,432                --
                                                                                          ----------         ---------

                                                                                           3,402,933         1,481,497
         Less current portion                                                                706,014           261,394
                                                                                          ----------         ---------
                                                                                          $2,696,919         1,220,103
                                                                                          ==========         =========
</TABLE>


               Long-term debt maturing each year subsequent to March 31, 1998 is
          as follows: 1999 - $706,014; 2000 - $1,805,498; 2001 - $648,856; 2002
          - $80,262; 2003 - $37,285 and thereafter - $125,018.

               At March 31, 1998, the Company had obtained waivers with respect
         to capital expenditure and dividend covenants and was in compliance
         with all other negative and affirmative covenants on its note payable
         secured by drilling equipment, transportation equipment and land and
         improvements. Such covenants included the maintenance of a net worth of
         at least $1,500,000, a debt to net worth ratio of less than 2.0 to 1.0,
         and a total debt service coverage ratio of greater than 1.0 to 1.0, at
         all times.

               Note a: On April 14, 1995, the Company executed a Master Real
         Estate Lien Note in the amount of $800,000 with a bank. This note
         provides the Company with a $400,000 "Guidance Line of Credit Facility"
         to be used for drilling, completion and equipping expenses of wells to
         be drilled. This note has an interest rate of one percent over the
         Bank's prime rate, 9.50% at March 31, 1998, and is due January 1, 1999.
         In addition to the Guidance Line of Credit Facility, the Master Note
         covers the other notes executed by the Company in favor of the Bank,
         and the loan secured by oil and gas properties purchased in 1992 and
         drilled in 1993.

               Note b: In September, 1995, the Company executed a note payable,
         in the amount of $245,250, to a bank for the purchase of the office
         building which the Company occupies as its headquarters in San Antonio,
         Texas. The note has a term of ten years and is payable in monthly
         payments of $1,900 including interest at 0.5% over the Bank's prime
         rate, 9.50% at March 31, 1998. In November, 1995 the Company closed on
         financing with

                                                                     (Continued)
                                      -27-


<PAGE>   28


            SOUTH TEXAS DRILLING & EXPLORATION, INC. AND SUBSIDIARIES

                   Notes to Consolidated Financial Statements


         the Small Business Administration which became a second lien on the
         headquarters building. The loan is in the amount of $114,000 and was
         used to pay down the amount borrowed from the bank for the purchase.
         This debt has a 20 year term and is payable in monthly payments of $921
         including interest at 6.713%.

               Note c: On May 8, 1996, the Company closed on a debt
         restructuring which included a term loan of $1,250,000 and a revolving
         line of credit of $500,000, which allowed the Company to pay off all
         its bank debt with the exception of the loan secured by the
         headquarters building in San Antonio and a minimal balance on the loan
         secured by the oil and gas properties. The new debt also allowed the
         Company to pay off the seller financing on the rig purchased in May,
         1995. Proceeds from the new debt were also used to reduce trade
         accounts payable and to provide funds for future drilling equipment
         purchases. The term loan is secured by drilling equipment,
         transportation equipment and the yard facility in Kenedy, Texas. The
         loan carries an interest rate of prime (8.50% at March 31, 1998) plus
         2.25% and is payable in monthly payments of $14,881 plus interest.
         Payments are based on a seven-year amortization and the loan is due in
         June, 1999. The revolving line of credit is secured by the Company's
         trade accounts receivable and carries an interest rate of prime (8.5%
         at March 31, 1998) plus 2.25%. The revolving line of credit had no
         outstanding balance at March 31, 1998.

               Note d: In June, 1997, the Company closed additional financing
         with the same lender for the purchase of drilling and transportation
         equipment. This note, in the amount of $1,050,000, carries an interest
         rate of prime (8.5% at March 31, 1998) plus 2.25% and is due in June,
         1999. The note provides for monthly payments of $12,500 (based on seven
         year amortization) plus interest. In October, 1997, the same lender
         approved and funded another loan for drilling equipment. This loan, in
         the amount of $600,000, has terms identical to the loan closed in June,
         1997. This note provides for monthly payments of $7,143 plus interest.

               Note e: In October, 1997, this lender approved a line of credit
         in the amount of $600,000 for capital expenditures. This line carries
         an interest rate of prime (8.5% at March 31, 1998) plus 2.25% and is
         due in June, 1999. In fiscal 1998, two draws were made on the capital
         expenditure line. The first, in the amount of $370,730, provides for
         monthly payments of $10,298 (three year amortization) plus interest.
         The second, in the amount of $148,736, provides for monthly payments of
         $4,132 (three year amortization) plus interest. At March 31, 1998,
         $80,534 was available under the capital expenditures line of credit.


(3)    Income Taxes

               Due to the utilization of net operating loss carryforwards, the
         Company had no Federal income tax liability at March 31, 1997 and an
         estimated alternative minimum tax liability of $18,000 at March 31,
         1998. The Company has also accrued a $44,688 liability for state
         franchise taxes for fiscal 1998 and a $33,000 liability for fiscal
         1997.

               At March 31, 1998, for Federal income tax purposes the Company
         had a net operating loss carryforward of approximately $14,934,000,
         investment tax credit carryforwards of approximately $15,000 and
         minimum tax credit carryforward of approximately $18,000 available to
         offset future taxable income and taxes.



                                                                     (Continued)
                                      -28-

<PAGE>   29


            SOUTH TEXAS DRILLING & EXPLORATION, INC. AND SUBSIDIARIES

                   Notes to Consolidated Financial Statements


               Unless utilized, net operating loss and investment tax credit
          carryforwards will expire as follows:

<TABLE>
<CAPTION>

                                                 Net          Investment
                                              Operating          Tax
Year                                            Loss            Credits
- ----                                         -----------     -----------
<S>                                          <C>             <C>
1999                                         $11,219,000           9,000
2000                                             889,000           5,000
2001                                           1,973,000           1,000
2002                                             452,000              --
2007                                             401,000              --
                                             -----------     -----------
                                             $14,934,000          15,000
                                             ===========     ===========
</TABLE>


               The tax effects of temporary differences that give rise to
         significant portions of the deferred tax assets and deferred tax
         liabilities at March 31, 1998 and 1997 are presented below:

<TABLE>
<CAPTION>

                                                                      March 31,
                                                           ----------------------------
                                                               1998            1997
                                                           -----------      -----------
<S>                                                        <C>                   <C>   
Deferred tax assets:
   Allowance for bad debts                                 $    52,000           48,000
   Investment tax credit and minimum
         tax credit carryforwards                               25,000          125,000
   Property and equipment, principally due to
           differences in depreciation                          49,000               --
   Net operating loss carryforwards                          5,516,000        5,379,000
                                                           -----------      -----------

         Total gross deferred tax assets                     5,642,000        5,552,000
   Less valuation allowance                                 (5,493,000)      (5,113,000)
                                                           -----------      -----------
             Total deferred tax assets                         149,000          439,000
                                                           -----------      -----------
Deferred tax liabilities:
   Property and equipment, principally due to
             differences in depreciation                            --          275,000
   Oil and gas properties, principally due to
             intangible drilling costs and differences
             in depletion                                      149,000          164,000
                                                           -----------      -----------
         Total gross deferred tax liabilities                  149,000          439,000
                                                           -----------      -----------
   Net deferred tax asset                                  $        --               --
                                                           ===========      ===========
</TABLE>


               A valuation allowance has been established to decrease total
         gross deferred tax assets to the amount of the total gross deferred tax
         liabilities due to the uncertainties involved in the ultimate
         realization of the deferred tax assets. The valuation allowance for
         deferred tax assets at March 31, 1997 was $5,113,000. The net change in
         total valuation allowance for the year ended March 31, 1998 was an
         increase of $380,000 due to the change in the corresponding gross
         deferred tax assets and liabilities.



                                                                     (Continued)
                                      -29-

<PAGE>   30


            SOUTH TEXAS DRILLING & EXPLORATION, INC. AND SUBSIDIARIES

                   Notes to Consolidated Financial Statements


(4)    Stock Options, Warrants and Stock Option Plan

         In December, 1988, the Board of Directors issued certain directors,
       officers and employees warrants to purchase 435,000 shares of the
       Company's common stock at $.15 per share, of which three warrants for a
       total of 55,000 shares have been exercised as of March 31, 1998 and two
       warrants for 245,000 shares have been canceled. These warrants are
       exercisable upon issuance and expire December 8, 1998. As of March 31,
       1998, 135,000 shares of Common stock were reserved for future issuance in
       connection with warrants issued to employees, directors, officers and
       former employees.

         In August, 1992, the Board of Directors issued certain directors,
       officers and employees warrants to purchase 235,000 shares of the
       Company's stock at $.10 per share, all of which have been exercised as of
       March 31, 1998.

         On May 1, 1995, the Board of Directors issued an option to Mr. Locke,
       President and Chief Executive Officer, to purchase 1,200,000 shares of
       the Company's common stock at $.375 per share. This option expires on May
       1, 2005. At March 31, 1998, 100,000 shares have been purchased and 60,000
       shares have been canceled under this option.

         On June 15, 1995, the Board of Directors issued certain directors,
       officers and employees options to purchase 128,500 shares of the
       Company's common stock at $.375 per share, 15,000 of which have been
       exercised as of March 31, 1998.

         On December 12, 1995, the Board of Directors issued certain officers
       options to purchase 100,000 shares of the Company's common stock at $.41
       per share, none of which has been exercised and 50,000 shares of which
       have been canceled as of March 31, 1998.

         On June 15, 1996, the Board of Directors issued certain directors
       options to purchase 10,000 shares of the Company's common stock at $.47
       per share, 5,000 of which have been exercised as of March 31, 1998.

         On July 1, 1997, the Board of Directors issued certain directors
       options to purchase 15,000 shares of the Company's common stock at $1.38
       per share, 5,000 of which have been exercised as of March 31, 1998.

         Under the Company's stock option plan, employee stock options become
       exercisable over a five year period and all options expire 10 years after
       the date of grant. All of the Company's options shall be granted at the
       fair market value of the Company's Common Stock on the date of grant.
       Accordingly as discussed in Note 1, no compensation expense relating to
       these options is recognized in the Company's results of operations.

         In addition, on June 18, 1997, the Board of Directors issued a seller
       of drilling equipment an option to purchase 150,000 shares of the
       Company's common stock at $1.50 per share, none of which has been
       exercised as of March 31, 1998.



                                                                     (Continued)
                                      -30-

<PAGE>   31


            SOUTH TEXAS DRILLING & EXPLORATION, INC. AND SUBSIDIARIES

                   Notes to Consolidated Financial Statements


      Information relating to stock options outstanding at March 31 is
summarized as follows:

<TABLE>
<CAPTION>

                                        1998                          1997                            1996
                              ------------------------     --------------------------     ---------------------------
                                              Exercise                       Exercise                       Exercise
                                             Price per                      Price per                      Price Per
                              Options         Option         Options         Option         Options         Option
                            ----------      ----------     ----------      ----------     ----------      -----------
<S>                         <C>             <C>            <C>             <C>            <C>             <C>
Balance Outstanding
      Beginning of year      1,272,500      $.375-0.47      1,325,500      $ .375-.41             --               --
       Granted                 165,000      $1.38-1.50         10,000      $    0.470      1,428,500      $  .375-.41
       Exercised               (24,000)     $.375-1.38         (1,000)     $    0.375       (100,000)     $     0.375
       Canceled                (60,000)          0.375        (62,000)     $ .375-.41         (3,000)     $     0.375
                            ----------      ----------     ----------      ----------     ----------      -----------
Balance Outstanding
      End of year            1,353,500      $.375-1.50      1,272,500      $ .375-.47      1,325,500      $  .375-.41
                            ==========      ==========     ==========      ==========     ==========      ===========
Options Exercisable
      End of year              681,500                        296,500                         20,000
                            ==========                     ==========                    ===========
</TABLE>

       At March 31, 1998, the weighted average price of options outstanding was
      $0.50 per share and the weighted average price of exercisable options was
      $0.64 per share.


       The Company has adopted the disclosure-only provisions of Statement of
      Financial Accounting Standards No. 123 (SFAS No. 123) "Accounting for
      Stock-Based Compensation." Accordingly, no compensation has been
      recognized for the stock option plan. If the Company had elected to
      recognize compensation cost based on the fair value of the options granted
      at grant date as prescribed by SFAS No. 123, net earnings and net earnings
      per share would have been reduced to the pro forma amounts indicated in
      the table below:

<TABLE>
<CAPTION>
                                                  1998              1997         1996
                                               -----------        -------       -------

<S>                                            <C>                <C>             <C>  
Net earnings-as reported                       $   830,940        563,689         2,772
Net earnings-pro forma                             774,797        485,869       (99,925)
Net earnings per share-as reported-basic              0.13           0.11            --
Net earnings per share-as reported-diluted            0.11           0.10            --
Net earnings per share-pro forma-basic                0.12           0.09         (0.02)
Net earnings per share-pro forma-diluted              0.10           0.08            --
Weighted-average fair value of options,
  granted during the year                             0.63           0.23          0.18
</TABLE>

         The fair value of each option grant is estimated on the date of grant
      using the Black-Scholes options-pricing model. The model assumed expected
      volatility of 65%, 46% and 46%, weighted average risk-free interest rates
      of 6.3%, 6.7% and 6.3% for grants in 1998, 1997 and 1996, respectively,
      and an expected life of five years. As the Company has not declared
      dividends since it became a public entity, no dividend yield was used.
      Actual value realized, if any, is dependent on the future performance of
      the Company's common stock, and overall stock market conditions. There is
      no assurance the value realized by an optionee will be at or near the
      value estimated by the Black-Scholes model.



                                                                     (Continued)
                                      -31-

<PAGE>   32


            SOUTH TEXAS DRILLING & EXPLORATION, INC. AND SUBSIDIARIES

                   Notes to Consolidated Financial Statements


(5)    Business Segments and Supplementary Earnings Information

         The Company is engaged in contract drilling of oil and gas wells and in
       oil and gas exploration, development and production. The oil and gas
       operations contributed an immaterial amount towards the Company's gross
       revenues in fiscal 1998 and constitute an insignificant amount of its
       total assets, therefore, disclosure of fiscal 1998 oil and gas
       information has been omitted. Information concerning business segments
       and supplementary earnings information is as follows:

<TABLE>
<CAPTION>

                                                Years Ended March 31,
                                              -------------------------
                                                1997            1996
                                              ----------     ----------
<S>                                           <C>             <C>      
Revenues:
 Contract drilling                            $8,001,352      7,024,144
 Oil and gas                                     501,962        475,510
                                              ----------     ----------
                                              $8,503,314      7,499,654
                                              ==========     ==========
Earnings (loss) from operations:
 Contract drilling                            $  376,439        (65,506)
 Oil and gas                                     174,894         81,114
                                              ----------     ----------
                                              $  551,333         15,608
                                              ==========     ==========
Identifiable assets at end of period:
 Contract drilling                            $4,375,971      3,501,058
 Oil and gas                                     675,313        784,592
                                              ----------     ----------
                                              $5,051,284      4,285,650
                                              ==========     ==========
Depreciation, depletion and amortization:
 Contract drilling                            $  475,135        384,400
 Oil and gas                                     148,479        192,494
                                              ----------     ----------
                                              $  623,614        576,894
                                              ==========     ==========
Capital expenditures:
 Contract drilling                            $  765,450      1,154,698
 Oil and gas                                       5,000          7,485
                                              ----------     ----------
                                              $  770,450      1,162,183
                                              ==========     ==========
Maintenance and repairs                       $  566,194        502,844
                                              ==========     ==========
</TABLE>

             In fiscal 1998, two customers each accounted for 10% or more of
       contract drilling revenues. The revenue attributed to those customers was
       $2,968,694 and $2,326,773.

             In fiscal 1997, only one customer accounted for 10% or more of
       contract drilling revenues. The revenue attributed to that customer was
       $1,116,322.

             In fiscal 1996, only one customer accounted for 10% or more of
       contract drilling revenues. The revenue attributed to that customer was
       $1,204,983.

(6)    Related Party Transactions

             A director owns an interest in several oil and gas properties in
       which the Company owns an interest. Two directors own interests in the
       well which the Company drilled in February, 1995 and continues to
       operate.


                                                                     (Continued)
                                      -32-

<PAGE>   33


            SOUTH TEXAS DRILLING & EXPLORATION, INC. AND SUBSIDIARIES

                   Notes to Consolidated Financial Statements


(7)    Commitments and Contingencies

             The Company is currently involved in a lawsuit styled National
       Energy Group, Inc. v. South Texas Drilling Company, cause No. 96-98, 357
       Judicial District Court, Willacy County, Texas. This case arose out of a
       dispute with a drilling customer over a billing for work performed under
       a daywork drilling contract. In the course of drilling the well, some of
       the Company's equipment was lost in the hole. Under the terms of the
       contract, the customer was billed for the drilling operations and
       replacement cost of the lost equipment. The customer filed a lawsuit
       alleging negligence, denying responsibility for the $279,000 billed by
       the Company, and seeking additional damages of $460,000 plus attorney's
       fees. Management, which believes the customer's claim to be without
       merit, filed a counter-suit seeking payment in full of the original
       invoice in the amount of $279,000. In fiscal 1996, an allowance for
       uncollectible accounts in the amount of $140,000 was established for this
       account. A jury trial in this case commenced in August, 1997. The jury
       found in favor of the Company and a judgment was entered in November,
       1997 granting the Company $163,000 plus attorneys' fees of $70,000. The
       customer filed an appeal of the judgment and at fiscal year-end, the case
       was in the early stages of the appeal. On June 10, 1998, the Company
       received $213,000 from National Energy Group in settlement of the
       lawsuit. Per the terms of the settlement, each of the parties agrees to
       release the other from all claims related to the lawsuit. The Company's
       accounts related to this matter will be adjusted in the period of
       resolution.

(8)    Fair Value of Financial Instruments

       Cash and cash equivalents, trade receivables and payables and short-term
       debt:

             The Company holds cash and cash equivalents, trade receivables and
       payables and short-term debt. The carrying amount of these instruments
       approximates fair value due to the short maturity of the instruments.

       Long-term debt:

             The carrying amount of the Company's long-term debt approximates
       fair value due to the recent issuance of the debt and the variable
       interest rate.

(9)    Acquisition

             In June, 1997, the Company acquired the drilling operations of San
       Patricio Corporation which included two land drilling rigs, rig handling
       trucks and trailers and miscellaneous drilling equipment. In addition,
       the Company assumed the lease of a third land drilling rig. The leased
       rig was returned to the lessor in February, 1998. The aggregate purchase
       price of $1,500,000 consisted of $900,000 of third-party financing,
       $300,000 of seller financing and $300,000 of the Company's Common Stock.
       The transaction was accounted for as a purchase with the results of
       operations being included in the Statement of Operations since the
       acquisition date.

             The following pro forma financial information for the years ended
       March 31, 1998 and 1997 gives effect to the above acquisition as though
       it were effective at the beginning of each period. The pro forma
       information may not be indicative of the results that would have occurred
       had the acquisition been effective on the dates indicated or of the
       results that may be obtained in the future. The pro forma information
       should be read in conjunction with the consolidated financial statements
       and notes thereto of the Company.


                                                                     (Continued)
                                      -33-

<PAGE>   34


            SOUTH TEXAS DRILLING & EXPLORATION, INC. AND SUBSIDIARIES


<TABLE>
<CAPTION>


                                                                                      Pro-Forma (Unaudited)
                                                                                           Years Ended
                                                                                            March 31,
                                                                           -------------------------------------------
                                                                                 1998                          1997
                                                                           ----------------                 ----------

<S>                                                                        <C>                              <C>       
Total Revenues                                                             $     19,465,810                 16,205,542
Net income applicable to common stock                                               881,966                    439,530
Earnings per common share - basic                                                      0.15                       0.08
Earnings per common share - diluted                                                    0.13                       0.08
Weighted average common and common equivalent
      shares outstanding - basic                                                  5,714,535                  5,306,158
Weighted average common and common equivalent
      shares outstanding - diluted                                                7,793,207                  5,724,440

</TABLE>


(10)  Preferred Stock

             In April, 1997, the Company issued a new Series A 8% Convertible
      Preferred Stock. The issue consisted of 400,000 shares with a redemption
      value of $800,000. Dividends payable in respect of Series A 8% convertible
      Preferred Stock shall accrue from day to day whether or not earned or
      declared and shall be cumulative. Accumulation of dividends on the Series
      A 8% Convertible Preferred Stock shall not bear interest. Dividends are
      payable annually. Dividends of $61,333 were accrued as of March 31, 1998.
      Subsequent to March 31, 1998 a payment of $64,000 was made to the
      preferred stockholder. This Preferred Stock is convertible into 800,000
      shares of Common Stock and one share of Common Stock for each $.50 of due
      but unpaid dividends on the Series A 8% Convertible Preferred Stock. The
      conversion rate is subject to adjustment on the third and seventh
      anniversary dates of issuance, depending on the trading value of the
      common stock. The stock is redeemable at the Company's option at or
      following the third anniversary of the issuance of such stock provided,
      generally, that the price of the Company's common stock equals or exceeds
      $2.50 per share. The proceeds from the stock were used to reduce trade
      accounts payable, bank debt and to acquire drilling equipment. Prior to
      the issuance of this new Series A preferred stock, the Company redeemed
      its previously issued and outstanding Series A preferred stock consisting
      of 235,000 shares of stock with a stated par value of $1.00 per share. The
      outstanding shares were redeemed for a cash payment of $75,000.

             In January, 1998, the Company issued a new Series B 8% Convertible
      Preferred Stock. The issue consisted of 184,615 shares with a redemption
      value of $2,999,994. Dividends payable in respect of Series B 8%
      convertible Preferred Stock shall accrue from day to day whether or not
      earned or declared and shall be cumulative. Accumulation of dividends on
      the Series B 8% Convertible Preferred Stock shall not bear interest.
      Dividends are payable annually. Dividends of $47,233 were accrued as of
      March 31, 1998. This preferred stock is convertible into 923,075 shares of
      the Company's common stock and one share of common stock for each $1.62 of
      due but unpaid dividends. The conversion rate is subject to adjustment on
      its third and seventh anniversary dates of issuance depending on the
      trading value of the common stock. The stock is redeemable at the
      Company's option at or following the first anniversary of the issuance of
      such stock provided, generally, that the price of the Company's common
      stock equals or exceeds $5.00 per share. The proceeds from the stock have
      been and will be used for equipment purchases, debt reduction and working
      capital.

11)   Oil and Gas Producing Activities (Unaudited)

             The Company's oil and gas properties and operations are presented
      in the consolidated financial statements on the full cost method of
      accounting. All of the Company' exploration and production is conducted
      in the United States. Due to the Company's acquisitions of substantial
      amounts of drilling equipment in fiscal 1998, the

                                      -34-



<PAGE>   35


            SOUTH TEXAS DRILLING & EXPLORATION, INC. AND SUBSIDIARIES



       Company's oil and gas operations no longer constitute a significant
       portion of the Company's assets. Therefore, to the extent permitted,
       fiscal year 1998 discussion and disclosure of information on oil and gas
       operations will be omitted.

             The aggregate amount of capitalized costs relating to oil and gas
       producing activities at the dates indicated are as follows:

<TABLE>
<CAPTION>
                                          March 31,
                                 ----------------------------
                                     1997             1996
                                 -----------      -----------
<S>                              <C>                <C>      
Proved properties                $ 1,749,809        1,749,467
Unproved properties                       --               --
                                 -----------      -----------
                                   1,749,809        1,749,467
Accumulated depletion             (1,161,309)      (1,012,830)
                                 -----------      -----------
                                 $   588,500          736,637
                                 ===========      ===========
Depletion rate per unit of
production (net equivalent
barrel, exclusive of ceiling
limitation adjustment)           $      7.07             7.07
                                 ===========      ===========
</TABLE>

             During the periods indicated in the preceding table, no internal
       costs were capitalized. Internal costs incurred during these periods were
       in the nature of general corporate overhead. All costs related to
       production, general corporate overhead and other similar activities are
       expensed in the period incurred. Costs of site restoration and
       dismantlement and abandonment have historically been equal to or less
       than revenue earned from salvage of the well equipment. Such costs, net
       of the salvage revenue, are added to or subtracted from the full cost of
       oil and gas properties. These costs have been minimal in the years being
       reported.

             The following table sets forth information with respect to
       quantities of net proved oil and gas reserves, as estimated by an
       in-house petroleum engineer, and changes in proved reserves. Estimates of
       reserves and production performance are subjective and may change
       materially as actual production information becomes available.

<TABLE>
<CAPTION>

                                        Oil and
                                       Condensate          Gas
                                         (Bbls)           (Mcf)
                                       ----------      ----------
<S>                                    <C>             <C>
Estimated quantity, March 31, 1995        368,980       1,527,130
  Revisions in previous estimates         (13,490)       (180,078)
  Production                              (12,260)        (89,802)
                                       ----------      ----------

Estimated quantity, March 31, 1996        343,230       1,257,250
  Revisions in previous estimates        (260,253)       (778,747)
  Production                              (10,007)        (65,963)
                                       ----------      ----------

Estimated quantity, March 31, 1997         72,970         412,540
                                       ==========      ==========
</TABLE>




                                      -35-

<PAGE>   36


            SOUTH TEXAS DRILLING & EXPLORATION, INC. AND SUBSIDIARIES


<TABLE>
<CAPTION>


                                 Years Ended March 31,
                     --------------------------------------------
                              1997                  1996
                     -------------------     --------------------
                      (Bbl)      (Mcf)        (Bbl)       (Mcf)
<S>                   <C>        <C>          <C>        <C>    
Proved developed
reserves:
Balance at
beginning of
year                  60,420     302,960      69,890     362,300
                     =======     =======     =======     =======
Balance at end
of year               72,970     412,540      60,420     302,960
                     =======     =======     =======     =======
</TABLE>

           Costs incurred for property acquisition, exploration and development
activities are summarized below:

<TABLE>
<CAPTION>


                              Years Ended March 31,
                              ---------------------
                                1997          1996
                               ------        ------
<S>                             <C>           <C>  
Property acquisition costs     $   --            --
Development costs               5,000         7,485
                               ------        ------
                               $5,000         7,485
                               ======        ======
</TABLE>


           Results of operations for producing activities for the periods
indicated were as follows:

<TABLE>
<CAPTION>

                                 Years Ended March 31,
                               ------------------------
                                 1997            1996
                               ---------      ---------

<S>                            <C>              <C>    
Revenues                       $ 401,542        380,110
Production costs                (177,318)      (169,008)
Depletion                       (148,479)      (192,494)
                               ---------      ---------
Results of operations from
producing activities
(excluding corporate
overhead and interest
costs)                         $  75,745         18,608
                               =========      =========
</TABLE>


         The following is a standardized measure of the discounted net future
       cash flows and changes applicable to proved oil and gas reserves required
       by FASB 69. The future cash flows are based on estimated oil and gas
       reserves utilizing prices and costs in effect as of year end discounted
       at 10% per year and assuming continuation of existing economic
       conditions.

         The standardized measure of discounted future net cash flows, in
       management's opinion, should be examined with caution. The basis for this
       table is a reserve study, as prepared by an in-house petroleum engineer,
       which contains estimates of quantities and rates of production of
       reserves. Revisions of previous year estimates can have a significant
       impact on these results. Also, exploration costs in one year may lead to
       significant discoveries in later years and may significantly change
       previous estimates of proved reserves and their valuation. Therefore, the

                                      -36-

<PAGE>   37


            SOUTH TEXAS DRILLING & EXPLORATION, INC. AND SUBSIDIARIES



       standardized measure of discounted future net cash flow is not
       necessarily a "best estimate" of the fair value of the Company's proved
       oil and gas properties.

<TABLE>
<CAPTION>

                                      Years Ended March 31,
                                  ----------------------------
                                     1997              1996
                                  -----------      -----------

<S>                               <C>               <C>       
Estimated future cash flows       $ 2,356,000       10,314,000
Estimated future production
 costs                             (1,364,000)      (3,013,000)
Estimated future development
 costs                                     --       (1,547,000)
                                  -----------      -----------
Estimated future net cash
 flows before income taxes            992,000        5,754,000
Estimated future income taxes         (66,000)      (1,684,000)
Ten percent discount for
 estimated timing of future
 cash flows                          (214,000)      (1,372,000)
                                  -----------      -----------
Standardized measure of
 discounted estimated future
 net cash flows                   $   712,000        2,698,000
                                  ===========      ===========
Changes in standardized
 measure of discounted
 estimated future net cash
 flows:
 Sales of oil and gas
   produced, net of
   production costs               $  (238,000)        (223,000)
 Extensions, discoveries and
   other additions, less
   related costs                           --               --
 Changes in estimated future
   development costs                1,041,000          179,000
 Revisions of previous
   quantity estimates              (1,743,000)        (369,000)
 Net changes in prices             (1,996,000)       1,010,000
 Accretion of discount                367,000          302,000
 Income taxes                       1,022,000         (223,000)
 Other                               (439,000)        (241,000)
                                  -----------      -----------
   Net increase (decrease)        $(1,986,000)         435,000
                                  ===========      ===========
</TABLE>



  ITEM 9.         DISAGREEMENTS ON ACCOUNTING AND FINANCIAL DISCLOSURE

         Not applicable.


                                      -37-

<PAGE>   38


            SOUTH TEXAS DRILLING & EXPLORATION, INC. AND SUBSIDIARIES



                                    PART III

  ITEM 10.        DIRECTORS AND EXECUTIVE OFFICERS OF THE REGISTRANT

      ROBERT R. MARMOR, 72, Chairman of the Board since April, 1980. Mr. Marmor
was Chief Executive Officer of the Company from April, 1980 until February, 1992
and President from June, 1984 until November, 1991, at which time he voluntarily
resigned from these positions and recommended his replacement. From December,
1979 until April, 1980, Mr. Marmor was President of the Company. From September,
1979 until December, 1979, Mr. Marmor was engaged in founding the Company. From
October, 1978 until September, 1979 he was associated as a petroleum engineering
consultant with Max K. Watson & Associates, Inc. of Austin, Texas, petroleum and
natural gas consultants. From 1977 to October, 1978 he was engaged in various
personal investment ventures. Mr. Marmor was employed from 1971 to 1977 in
Adelaide, Australia by Delhi International Oil Corporation, Dallas, Texas, and
served as project development manager and later as operations manager
responsible for the exploration, drilling and production divisions.

      WILLIAM D. HIBBETTS, 49, CPA, a Director since June, 1984. Mr. Hibbetts is
Chief Accounting Officer of Southwest Venture Management Company. He was
Treasurer/Controller of Gary Pools, Inc. from May, 1986 to July, 1988. He served
as an officer of the Company from January 1, 1982 until May 1, 1986. Mr.
Hibbetts served in various positions as an accountant with KPMG Peat Marwick LLP
from June, 1971 to December, 1981. Mr. Hibbetts served as manager in that
accounting firm's audit group from July, 1978 to December, 1981.

      CHARLES B. TICHENOR, II, 71, a Director since May, 1988. Dr. Tichenor is
Distinguished Corporation Chief Executive Professor of Business at Gardner-Webb
University Broyhill School of Management since May, 1997. He was Distinguished
Corporation Chief Executive-in-Residence/Professor at The Indiana University of
Pennsylvania from January 1, 1995 to May, 1997. Mr. Tichenor was Vice-Chancellor
at Elizabeth City State University from February, 1992 to December 31, 1994. He
was a professor at the College of Business of Mississippi State University where
he occupied the position of Distinguished Corporation Chief Executive
Officer-in-Residence from 1987 to 1992. Mr. Tichenor is the retired Chairman of
Champale, Inc., a Fortune 1000 Company, where he served as president and
chairman of the board from 1975 to 1983. He is a member of the Board of Trustees
of Rider College, Lawrenceville, NJ and he currently or formerly served on the
Boards of Doughty Foods, Inc., NYP Container Corp., MCM Investments Co.,
Johnston Printing Co and Essex Bank of Virginia.

      ALVIS L. DOWELL, 62, a Director since February, 1991. Mr. Dowell was
President and Chief Executive Officer from November 7, 1992 to May 1, 1995. He
was Chief Operating Officer from February, 1991 and Vice President from May 2,
1991. From 1988 until 1991, Mr. Dowell was employed by Maersk Oil and Gas,
Copenhagen, Denmark as Assistant Manager, Drilling Department. From 1972 to
1988, Mr. Dowell was with Aramco, Saudi Arabian Operations as Drilling Safety
Engineer and later as Superintendent Offshore Drilling and then Drilling
Manager. He served as Director/Safety and Loss Prevention, Safety Engineering
and Regional Engineering Manager with Holiday Inns, Inc., Texas Employers
Insurance and Northwestern National Insurance Company.

      WM. STACY LOCKE, 42, a Director since May 1, 1995. Mr. Locke is President
and Chief Executive Officer since May 1, 1995. He was Vice President -
Investment Banking with Arneson, Kercheville, Ehrenberg & Associates, Inc. from
January 1, 1993 to April 30, 1995. From 1988-1992, Mr. Locke was Vice
President - Investment Banking with Chemical Banking Corporation, Texas
Commerce Bank. He was Senior Geologist with Huffco Petroleum Corporation from
1982-1986. From 1979 to 1982 Mr. Locke worked for Tesoro Petroleum Corporation
and Valero Energy as a Geologist.

      MARY L. KILGORE, 59, Vice President of Administration since December, 1993
and Corporate Secretary of the Company since May, 1986, has been employed in
various positions by the Company and its predecessor from August, 1978.

                                      -38-


<PAGE>   39


            SOUTH TEXAS DRILLING & EXPLORATION, INC. AND SUBSIDIARIES




      CHRIS F. PARMA, 48, CPA, Vice President and Chief Financial Officer since
December, 1995. He has been employed as Controller of the Company since October,
1990. He served in various accounting positions from Staff Accountant to
Controller from 1972 to 1990 with J. H. Uptmore & Associates, Inc., Real Estate
Developer. He served as Vice President of Uptmore from 1985 to 1990.

  ITEM 11.        EXECUTIVE COMPENSATION

      The following table sets forth the compensation paid or accrued by the
Company and its subsidiaries for services performed during the fiscal year ended
March 31, 1998, to the chief executive officer of the Company. No other officer
was paid total compensation of $100,000 or more. See Item 13 for a summary of
compensation due to Mr. Locke, the chief executive officer of the Company, under
his employment agreement with the Company.

                           Summary Compensation Table
<TABLE>
<CAPTION>

                                                         Other         Re-                                   All
      Name                                               Annual     stricted        Warrants/    LTIP       Other
      and                                               Compen-      Stock          Options/     Pay-       Compen-
    Principal                Salary      Bonus          sation       Award            SARs       outs       sation
    Position        Year       $           $               $           $               #          $           $
- ---------------     ----     ------      -----         --------     --------        --------    -----      --------
<S>                 <C>      <C>         <C>           <C>          <C>             <C>          <C>       <C>
Wm. Stacy Locke
    CEO             1998     85,730         --         1,231(1)     55,000(2)         --         --
                    1997     71,750         --           479(1)     52,083(3)         --         --
                    1996     33,000         --           479(1)     18,333(4)         --         --        3,130(5)
Al L. Dowell
    CEO             1996     56,250         --         2,244(6)     11,960(7)         --         --           --
</TABLE>


  (1) Includes value of personal use of company-provided vehicle.

  (2) Includes 12,342 shares paid per employment agreement.

  (3) Includes 84,734 shares accrued per employment agreement.

  (4) Includes 48,889 shares accrued per employment agreement.

  (5) Includes value realized on exercise of 100,000 shares of Stock Option
      Plan granted May, 1995. See "Option/SAR Grants in Last Fiscal Year".

  (6) Includes value of personal use of company-provided vehicle and Directors'
      fee paid by the Company.

  (7) Includes 50,000 shares issued as a bonus. Value is calculated based on the
      average of the bid and ask prices at issue date discounted due to 2-year
      restriction on sale or transfer of stock.



                                      -39-

<PAGE>   40


            SOUTH TEXAS DRILLING & EXPLORATION, INC. AND SUBSIDIARIES



      From December, 1988, through June, 1995, Directors received 1,000 shares
of the Company's common stock for each directors' meeting attended. From July,
1995 through June 1996, Directors who were not officers or employees of the
Company received $1,000 each quarter for their service on the Board and $250 for
each meeting attended. From July 1996 through March 1997 those Directors
received $500 each quarter for their service on the Board and $250 for each
meeting attended. Beginning in April 1997 the Directors will once again receive
$1,000 each quarter for their service on the Board and $250 for each meeting
attended. Directors who are not officers or employees of the Company and reside
outside of the surrounding area in which a board meeting is held are entitled to
reimbursement for travel expenses incurred by them in attending directors'
meetings for their service on the Board and $250 for each meeting attended. In
fiscal 1998, the Board reinstated the $1,000 fee per quarter for outside
directors for the period from July, 1996 through March, 1997.

      The following table summarizes as to the chief executive officer of the
Company, the number and terms of stock options granted during the year ended
March 31, 1998:

                      Option/SAR Grants in Last Fiscal Year

<TABLE>
<CAPTION>

                                        % of Total                                               Potential         
                        Number of        Options/                                             Realized Value at     
                       Securities           SARs                                          Assumed Annual Rates of   
                       Underlying       Granted to                                      Stock Price Appreciation    
                        Options/         Employees       Exercise                             for Option Term       
                           SARs          in Fiscal       or Base         Expiration      ------------------------
      Name             Granted(#)           Year       Price($/sh)          Date            5%($)        10%($)
      ----             -----------      -----------    ------------      ----------      -----------   ----------
 <S>                   <C>              <C>            <C>               <C>             <C>           <C>

                            No stock options were granted in the current fiscal year.

</TABLE>

      The following table shows as to the chief executive officer of the Company
the net value realized (market value less exercise price) with respect to stock
options exercisable/unexercisable during the last year:

                    Aggregated Option/SAR Exercises in Last
                    Fiscal Year and FY-End Option/SAR Values

<TABLE>
<CAPTION>
                                                                         Number of
                                                                         Securities              Value of
                                                                         Underlying            Unexercised
                                                                        Unexercised            In-the-Money
                                                                      Options/SARs at         Options/SARs at
                                                                         FY-End(#)               FY-End($)
                          Shares Acquired            Value              Exercisable/          Exercisable/
     Name                  on Exercise(#)          Realized($)         Unexercisable         Unexercisable
- ---------------           ---------------          -----------        ---------------       ----------------

<S>                       <C>                      <C>                <C>                   <C>    
Wm. Stacy Locke                        --                   --        420,000/620,000       472,500/697,500
</TABLE>



                                      -40-




<PAGE>   41


            SOUTH TEXAS DRILLING & EXPLORATION, INC. AND SUBSIDIARIES



      The following table summarizes as to each of the executive officers of the
Company, the number and terms of stock warrants granted during the year ended
March 31, 1998:

                   Stock Warrants Granted in Last Fiscal Year
                                Individual Grants
<TABLE>
<CAPTION>


                                                            % of Total
                                                             Warrants
                                          Stock             Granted to
                                         Warrant            Employees in        Exercise         Expiration
  Name                                   Grants             Fiscal Year          Price              Date
  ----                                   -------            ------------        --------         ----------
<S>                                      <C>
           No stock warrants were granted in the current fiscal year.
</TABLE>


      The following table shows as to each of the executive officers of the
Company the net value of securities or cash realized (market value less exercise
price) with respect to stock warrants exercisable/unexercisable during the last
year:

             Aggregated Stock Warrant Exercises in Last Fiscal Year
                    and Fiscal Year End Stock Warrant Values

<TABLE>
<CAPTION>

                                                                                                          Value of
                                                                                 Number of              Unexercised
                                                                                 Unexercised            In-the-Money
                                                                               Stock Warrants           Stock Warrants
                                       Shares                                    at FY-End               at FY-End
                                     Acquired on              Value             Exercisable/            Exercisable/
                        Name          Exercise               Realized          Unexercisable           Unexercisable
                        ----         -----------             --------          --------------          ---------------
<S>                     <C>
                    In the current fiscal year, there were no stock warrant exercises by
                    executive officers nor were there any stock warrant values at year end.
</TABLE>


  ITEM 12.       SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS AND MANAGEMENT

      The following table sets forth certain information, as of June 5, 1998,
with respect to each person who is known by the Company to be the beneficial
owner of more than 5% of the outstanding shares of Common Stock, the Series A
Preferred Stock and the Series B Preferred Stock, each director of the Company,
and all officers and directors of the Company as a group. Except as otherwise
indicated, each person has sole investment and voting power with respect to the
shares shown.


                                      -41-

<PAGE>   42


            SOUTH TEXAS DRILLING & EXPLORATION, INC. AND SUBSIDIARIES
<TABLE>
<CAPTION>


                                                                                     Nature of         Percentage
  Title of                    Name and Address of                                   Beneficial         Ownership
   Class                        Beneficial Owner                                     Ownership         of Class(7)
  ------------------          ---------------------------                           ----------         -----------
  <S>                         <C>                                                    <C>                <C>
  Preferred Series A          T.L.L. Temple Foundation                                 400,000           100.0%
                              109 Temple Blvd., Suite 300
                              Lufkin, Texas 75901-7321

  Preferred Series B          T.L.L. Temple Foundation                                 153,915            83.4%
                              109 Temple Blvd., Suite 300
                              Lufkin, Texas 75901-7321

  Preferred Series B          Temple Interests L.P.                                     30,700            16.6%
                              109 Temple Blvd, Suite 100
                              Lufkin, Texas 75901-7321

  Common                      Rowan Companies, Inc.                                    750,000            10.5%
                              1900 Post Oak Tower
                              5051 Westheimer
                              Houston, TX 77056

  Common                      Robert R. Marmor                                         422,393(1)          5.9%
                              9310 Broadway, Bldg. I
                              San Antonio, TX 78217

  Common                      William D. Hibbetts                                      146,612(2)          2.0%
                              13007 Blanche Coker
                              San Antonio, TX 78216

  Common                      Charles B. Tichenor                                       58,000              .8%
                              Box 342 Gardner-Webb University
                              Boiling Spring, NC 28017

  Common                      Alvis L. Dowell                                          162,000(3)          2.3%
                              1167 Fairway Dr. W
                              Lindale, Tx 75771

  Common                      Wm. Stacy Locke                                        1,397,965(5)         19.5%
                              9310 Broadway, Bldg. I
                              San Antonio, Texas 78217
</TABLE>



                                      -42-

<PAGE>   43


            SOUTH TEXAS DRILLING & EXPLORATION, INC. AND SUBSIDIARIES
<TABLE>
<CAPTION>



                                                                                     Nature of               Percentage
  Title of                    Name and Address of                                   Beneficial                Ownership
   Class                        Beneficial Owner                                     Ownership              of Class(7)
  --------                  ------------------------------------------              ----------              -----------
<S>                         <C>                                                     <C>                      <C>
  Common                      Richard Phillips                                         390,144(4)                  5.4%
                              5701 Agnes Street
                              Corpus Christi, Texas 78408

  Common                      Rodney Lewis                                             120,725                     1.7%
                              10101 Reunion Pl., Suite 250
                              San Antonio, Texas 78216

                              All officers and directors as a group (9               2,866,680(6)                 39.9%
                              persons)
</TABLE>


  (1)    Does not include 180,420 shares owned by Mr. Marmor's children and
         grandchildren. Mr. Marmor disclaims beneficial ownership and has no
         voting rights or dispositive power in these 180,420 shares.

  (2)    Includes options issued to Mr. Hibbetts by the Board of Directors to
         purchase 15,000 shares .

  (3)    Includes options issued to Mr. Dowell by the Board of Directors to
         purchase 3,913 shares .

  (4)    Includes 240,000 shares and an option issued to San Patricio
         Corporation, which is wholly owned by Richard Phillips, to purchase an
         additional 150,000 shares, .

  (5)    Includes options issued to Mr. Locke to purchase an additional
         1,040,000 shares. (See Item 13.)

  (6)    Includes options to purchase 223,913 shares issued to the officers and
         directors by the Board of Directors. Also includes an option to
         purchase an additional 1,040,000 shares by Mr. Locke (see item 13).

  (7)    Percentage of class outstanding is calculated assuming all officers and
         directors exercise all outstanding options and warrants.

  ITEM 13.        CERTAIN RELATIONSHIPS AND RELATED TRANSACTIONS

         The Company's president and chief executive officer, Mr. Wm. Stacy
       Locke, commenced employment by the Company on May 1, 1995, under a two
       year employment agreement calling for a base salary of $100,000 for the
       first year of the two year term and $150,000 for year two. $20,000 of Mr.
       Locke's first year's salary was paid in Common Stock valued at the
       average market value of such shares during March, 1996. Likewise, $55,000
       of the $150,000 salary payable to Mr. Locke during the second year of his
       employment with the Company was paid in Common Stock valued at its
       average market value during March, 1997.

         The terms of Mr. Locke's agreement required the Company to issue ISO's
       to Mr. Locke for 1,200,000 shares of Common Stock with an exercise price
       of $.375 per share. While Mr. Locke remains employed by the Company

                                      -43-


<PAGE>   44


            SOUTH TEXAS DRILLING & EXPLORATION, INC. AND SUBSIDIARIES



       and after the earlier to occur of (I) May 1, 1998 or (ii) the acquisition
       by Mr. Locke of at least 10% of the Company's outstanding Common Stock,
       on a fully diluted basis, and assuming the exercise of all exercisable
       stock options held by Mr. Locke, on each May 1 Mr. Locke may accelerate
       his ability to exercise all or any part of the options to purchase
       240,000 shares of Common Stock which would otherwise become exercisable
       on the next following May 1 under his ISO up to the amount necessary for
       him to achieve or maintain the 10% ownership of Common Stock determined
       as described above. After all of Mr. Locke's ISO's become exercisable,
       the Company has agreed to issue additional ISO's (or non-qualified
       options if ISO's cannot be made available) covering up to 240,000 shares
       on each May 1 at an exercise price equal to the then market value of
       Common Stock in order to provide Mr. Locke with an opportunity to acquire
       and maintain ownership of 10% of the Company's Common Stock on the basis
       described above. In the event the Company shall receive gross cash
       proceeds of $10 million or more in connection with an underwritten public
       offering of Common Stock, Mr. Locke's rights to additional options shall
       cease. All of Mr. Locke's options would become exercisable upon any
       acquisition or change in control of the Company.


                                     PART IV

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

       (a) Index to Financial Statements and Schedules and Exhibits

       1.  The following consolidated financial statements of South Texas
           Drilling & Exploration, Inc. and its subsidiaries are included in
           Part II, Item 8 of this Report:

               Independent Auditors' Report.

               Consolidated Balance Sheets at March 31, 1998 and 1997.

               Consolidated Statements of Operations for the years ended March
               31, 1998, 1997 and 1996.

               Consolidated Statements of Shareholders' Equity for the years
               ended March 31, 1998, 1997 and 1996.

               Consolidated Statements of Cash Flows for the years ended March
               31, 1998, 1997 and 1996.

               Notes to Consolidated Financial Statements.

       2.  Financial Statement Schedules:

               Supplementary Income Statement Information is included in Part
               IV, Item 14, "Financial Statements and Supplementary data" of
               this Report.

               Schedule II - Valuation and Qualifying Accounts.

               (All other schedules are omitted as inapplicable, not required,
               or already covered in the financial statements and notes
               thereto).


                                      -44-

<PAGE>   45


            SOUTH TEXAS DRILLING & EXPLORATION, INC. AND SUBSIDIARIES



       3.      The following exhibits are filed as part of this Report:
<TABLE>

<S>                   <C>
 (3)                  Articles of Incorporation and Bylaws of the Company (previously filed as an Exhibit 
                      to the company's 1981 Annual Report on Form 10-K, File No. 2-70145).

 (10)(a)              Stock Purchase and Options Agreement dated December 28, 1981 between the Company
                      and Rowan Companies, Inc. ("Rowan") (previously filed as an Exhibit to the Company's
                      1981 Annual Report on Form 10-K, File No. 2-70145).

 (10)(b)              Amended and Restated Agreement of Sale dated December 28, 1981 between the
                      Company and Rowan relating to acquisition of the Tender Rigs (previously filed as an
                      Exhibit to the Company's 1981 Annual Report on Form 10-K, File No. 2-70145).

 (10)(c)              Note Purchase and Warrant Agreement between the Company and Connecticut General
                      Life Insurance Company and Teachers Insurance and Annuity Association relating to
                      acquisition of the Tender Rigs (previously filed as an Exhibit to the Company's 1981
                      Annual Report on Form 10-K, File No. 2-70145).

 (10)(d)              Amendment No. 2 to Warrant Agreement dated April 12, 1984 between the Company and
                      Connecticut General Life Insurance Company and Teachers Insurance and Annuity
                      Association (previously filed as an Exhibit to the Company's 1983 Annual Report on Form
                      10-K, File No. 2-70145).

 (10)(e)              Letter of Basic Terms dated April 12, 1984 between the Company and Connecticut
                      General Life Insurance Company and Teachers Insurance and Annuity Association
                      regarding the recapitalization or reorganization of South Texas Offshore Drilling Company
                      (previously filed as an Exhibit to the Company's 1983 Annual Report on Form 10-K, File
                      No. 2-70145).

 (10)(f)              Agreement dated April 12, 1984 among the Company and Connecticut General Life
                      Insurance Company and Teachers Insurance and Annuity Association of America releasing
                      certain obligations of the Company (previously filed as an Exhibit to the Company's 1983
                      Annual Report on Form 10-K, File No. 2-70145).

 (10)(g)              Loan Agreement dated December 28, 1981 between the Company and Frost National Bank
                      of San Antonio (previously filed as an Exhibit to the Company's 1983 Annual Report on
                      Form 10-K, File No. 2-70145).

 (10)(h)              Second Amendment dated April 13, 1984 to the Loan Agreement dated December 28,
                      1981 between the Company and Frost National Bank of San Antonio (previously filed as
                      an Exhibit to the Company's 1983 Annual Report on Form 10-K, File No. 2-70145).

 (10)(i)              Modification of General Guaranty dated April 13, 1984 between the Company and Frost
                      National Bank of San Antonio modifying the Company's guarantee of the Promissory Note
                      of South Texas/1200, Ltd. (previously filed as an Exhibit to the Company's 1983 Annual
                      Report on Form 10-K, File No. 2-70145).
</TABLE>

                                      -45-

<PAGE>   46


            SOUTH TEXAS DRILLING & EXPLORATION, INC. AND SUBSIDIARIES

<TABLE>

 <S>                  <C>
 (10)(j)              The Company's 1983 Non-qualified Stock Option Plan (previously filed as an Exhibit to
                      the Company's 1983 Annual Report on Form 10-K, File No. 2-70145).

 (10)(k)              Letter from Hoy M. Booker deferring enforcement of legal remedies (previously filed as
                      an Exhibit to the Company's 1983 Annual Report on Form 10-K, File No. 2-70145).

 (10)(l)              Letter from R. L. Kirkwood deferring enforcement of legal remedies (previously filed as
                      an Exhibit to the Company's 1983 Annual Report on Form 10-K, File No. 2-70145).

 (10)(m)              Modification of Representation and Warranty of Second Amendment dated April 13, 1984
                      to the Loan Agreement dated December 28, 1981 between the company and Frost National
                      Bank of San Antonio (previously filed as an Exhibit to the Company's 1984 Annual Report
                      on Form 10-K, File No. 2-70145).

 (10)(n)              Agreement and Release dated January 3, 1986, between the Company and Hoy M. Booker
                      and Robert L. Kirkwood regarding the assignment of certain oil and gas properties in
                      satisfaction of certain promissory notes (previously filed as an Exhibit to the Company's
                      1985 Annual Report on Form 10-K, File No. 2-70145).

 (10)(o)              Debt Cancellation Agreement dated March 24, 1986 between the company and Frost
                      National Bank of San Antonio (previously filed as an Exhibit to the Company's 1985
                      Annual Report on Form 10-K, File No. 2-70145).

 (10)(p)              Amendment #1 To Debt Cancellation Agreement dated March 24, 1986 between the
                      Company and Frost National Bank of San Antonio (previously filed as an Exhibit to the
                      Company's 1986 Annual Report on Form 10-K, File No. 2-70145).

 (10)(q)              Amendment #2 To Debt Cancellation Agreement dated March 24, 1986 between the
                      Company and Frost National Bank of San Antonio (previously filed as an Exhibit to the
                      Company's 1986 Annual Report on Form 10-K, File No. 2-70145).

 (10)(r)              Modification and Extension of Term Note dated April 16, 1986 between the Company and
                      Frost National Bank of San Antonio (previously filed as an Exhibit to the Company's 1986
                      Annual Report on Form 10-K, File No. 2-70145).

 (10)(s)              Bill of Sale of Oil and Gas Drilling Rigs dated April 16, 1986 between the Company and
                      Frost National Bank of San Antonio (previously filed as an Exhibit to the Company's 1986
                      Annual Report on Form 10-K, File No. 2-70145).

 (10)(t)              Convertible subordinated note dated January 1, 1989 between the Company and Frost
                      Bank (previously filed as an Exhibit to the Company's 1989 Annual Report on Form 10-K,
                      File No. 2-70145).

 (10)(u)              Convertible subordinated note dated November 1, 1988 between the Company and Larry
                      Temple (previously filed as an Exhibit to the Company's 1989 Annual Report on Form 10-
                      K, File No. 2-70145).
</TABLE>

                                      -46-

<PAGE>   47


            SOUTH TEXAS DRILLING & EXPLORATION, INC. AND SUBSIDIARIES
<TABLE>


<S>                  <C>
(10)(v)              Rig Lease and Refurbishing Agreement (Rig 11) dated September 21, 1990 between the
                     Company and LB Sales and Leasing, Inc. (previously filed as an Exhibit to the Company's
                     1991 Annual Report on Form 10-K, File No. 2-70145).

(10)(w)              Rig Lease and Refurbishing Agreement (Rig 12) dated September 21, 1990 between the
                     Company and LB Sales and Leasing, Inc. (previously filed as an Exhibit to the Company's
                     1991 Annual Report on Form 10-K, File No. 2-70145).

(10)(x)              Revised and restated rig Lease and Refurbishing Agreement regarding Rig 11 and Rig 12
                     dated September 27, 1991 between the Company and LB Sales and Leasing, Inc.
                     (previously filed as an Exhibit to the Company's 1992 Annual Report on Form 10-K, File
                     No. 2-70145).

(10)(y)              Settlement Agreement dated November 13, 1991 between the Company and Frio Drilling
                     Company (previously filed as an Exhibit to the Company's 1992 Annual Report on Form
                     10-K, File No. 2-70145).

(10)(z)              Settlement Agreement dated December 29, 1994 between the Company and L. B. Sales
                     and Leasing, Inc. ( previously filed as an Exhibit to the Company's 1995 Annual Report
                     on Form 10-K, File No. 2-70145).

(10)(aa)             Executive Employment Agreement dated May 1, 1995 between the Company and Wm.
                     Stacy Locke (previously filed as an Exhibit to the Company's 1995 Annual Report on
                     Form 10-K, File No. 2-70145).

(10)(bb)             Form of Loan and Security Agreement dated May 8, 1996 between the Company and
                     Finova Capital Corporation (previously filed as an Exhibit to the Company's 1996 Annual
                     Report on Form 10-K, File No. 2-70145).

(10)(cc)             Form of Schedule to Loan and Security Agreement dated May 8, 1996  between the
                     Company and Finova Capital Corporation (previously filed as an Exhibit to the Company's
                     1996 Annual Report on Form 10-K, File No. 2-70145).

(10)(dd)             Asset Purchase Agreement May 23, 1997 between the Company and San Patricio
                     Corporation (previously filed as an Exhibit to the Company's 1996 Annual Report on Form
                     10-K, File No. 2-70145).

(10)(ee)             Non-Statutory Stock Option Agreement dated June 18, 1997 between the Company and
                     San Patricio Corporation (previously filed as an Exhibit to the Company's 1996 Annual
                     Report on Form 10-K, File No. 2-70145).

(10)(ff)             Second Amended Certificate of Designation, Reducing The Number Of Shares Formerly
                     Designated Series A, Series B and Series C Preferred Stock to Zero and Designating The
                     Voting Powers, Preferences and Rights of A New Series A 8% Convertible Preferred
                     Stock  dated April 15, 1997  (previously filed as an Exhibit to the Company's 1996 Annual
                     Report on Form 10-K, File No. 2-70145).
</TABLE>

                                      -47-

<PAGE>   48


            SOUTH TEXAS DRILLING & EXPLORATION, INC. AND SUBSIDIARIES
<TABLE>

<S>            <C>
(10)(gg)       Third Amended Certificate of Designation, Correcting An Error In The Second Amended
               Certificate of Designation and Designating the Voting Powers, Preferences And Right Of
               A New Series B 8% Convertible Preferred Stock dated June 9, 1998.

(10)(hh)       First Amendment To Loan And Security Agreement dated May 8, 1996 between the
               Company and Finova Capital Corporation dated June 18, 1997.

(10)(ii)       Second Amendment To Loan and Security Agreement dated May 8, 1996 between the
               Company and Finova Capital Corporation.

(22)           Subsidiaries of the registrant (previously filed as an Exhibit to the Company's 1992 Annual
               Report on Form 10-K, File No. 2-70145).

(27)           Financial Data Schedule

(b) Reports of Form 8-K:  No reports on Form 8-K were filed with the Securities and Exchange Commission during the last 
    quarter of the period covered by this report.
</TABLE>



                                      -48-

<PAGE>   49



                                                                     SCHEDULE II

            SOUTH TEXAS DRILLING & EXPLORATION, INC. AND SUBSIDIARIES



                        Valuation and Qualifying Accounts


<TABLE>
<CAPTION>

                                                     Balance           Charged
                                                       at              to costs             Deductions             Balance
                                                    beginning            and                   from                  at
                                                     of year           expenses              accounts             year end
                                                    ---------          --------             ----------            --------

  <S>                                               <C>                 <C>                  <C>                   <C>
  Year ended March 31, 1996:
   Allowance for doubtful
      receivables                                   $      --           140,000                     --             140,000
                                                    =========          ========             ==========            ========

  Year ended March 31, 1997:
   Allowance for doubtful
      receivables                                   $ 140,000                --                     --             140,000
                                                    =========          ========             ==========            ========


  Year ended March 31, 1998:
   Allowance for doubtful
      receivables                                   $ 140,000                --                     --             140,000
                                                    =========          ========             ==========            ========

</TABLE>



                                      -49-

<PAGE>   50



                                   SIGNATURES


      Pursuant to the requirements of Section 13 or 15 (d) of the Securities
Exchange Act of 1934, South Texas Drilling & Exploration, Inc. has duly caused
this report to be signed on its behalf by the undersigned, this day of June,
1998 thereunto duly authorized.



                                           By /s/ Robert R. Marmor
                                             ----------------------------------
                                             Robert R. Marmor, Chairman

      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 Company
and in the capacities and on the dates indicated.

<TABLE>
<CAPTION>
                                               
    Signature                                 Title                          Date     
- ---------------------------           -----------------------             -------------
                                                                                       
<S>                                   <C>                                 <C>
                                                                                       
/s/ Robert R. Marmor                  Chairman and Director               June 25, 1998
- ----------------------------                                                           
Robert R. Marmor                                                                       
                                                                                       
                                                                                       
/s/  Wm. Stacy Locke                  President and Chief                 June 25, 1998
- ----------------------------          Executive Officer and                            
Wm. Stacy Locke                       Director                                         
                                                                                       
                                                                                       
/s/  Al Dowell                        Director                            June 25, 1998
- ----------------------------                                                           
Al Dowell                                                                              
                                                                                       
                                                                                       
/s/  William D. Hibbetts              Director                            June 25, 1998
- ----------------------------                                                           
William D. Hibbetts                                                                    
                                                                                       
                                                                                       
/s/  Chris F. Parma                   Vice President and                  June 25, 1998
- ----------------------------          Chief Financial Officer                          
Chris F. Parma                                                                         

</TABLE>

                                      -50-

<PAGE>   51
                               INDEX TO EXHIBITS

<TABLE>
<CAPTION>

EXHIBIT No.                                             DESCRIPTION
- --------------------------------------------------------------------------------------------------------- 

<S>                   <C>
 (3)                  Articles of Incorporation and Bylaws of the Company (previously filed as an Exhibit 
                      to the company's 1981 Annual Report on Form 10-K, File No. 2-70145).

 (10)(a)              Stock Purchase and Options Agreement dated December 28, 1981 between the Company
                      and Rowan Companies, Inc. ("Rowan") (previously filed as an Exhibit to the Company's
                      1981 Annual Report on Form 10-K, File No. 2-70145).

 (10)(b)              Amended and Restated Agreement of Sale dated December 28, 1981 between the
                      Company and Rowan relating to acquisition of the Tender Rigs (previously filed as an
                      Exhibit to the Company's 1981 Annual Report on Form 10-K, File No. 2-70145).

 (10)(c)              Note Purchase and Warrant Agreement between the Company and Connecticut General
                      Life Insurance Company and Teachers Insurance and Annuity Association relating to
                      acquisition of the Tender Rigs (previously filed as an Exhibit to the Company's 1981
                      Annual Report on Form 10-K, File No. 2-70145).

 (10)(d)              Amendment No. 2 to Warrant Agreement dated April 12, 1984 between the Company and
                      Connecticut General Life Insurance Company and Teachers Insurance and Annuity
                      Association (previously filed as an Exhibit to the Company's 1983 Annual Report on Form
                      10-K, File No. 2-70145).

 (10)(e)              Letter of Basic Terms dated April 12, 1984 between the Company and Connecticut
                      General Life Insurance Company and Teachers Insurance and Annuity Association
                      regarding the recapitalization or reorganization of South Texas Offshore Drilling Company
                      (previously filed as an Exhibit to the Company's 1983 Annual Report on Form 10-K, File
                      No. 2-70145).

 (10)(f)              Agreement dated April 12, 1984 among the Company and Connecticut General Life
                      Insurance Company and Teachers Insurance and Annuity Association of America releasing
                      certain obligations of the Company (previously filed as an Exhibit to the Company's 1983
                      Annual Report on Form 10-K, File No. 2-70145).

 (10)(g)              Loan Agreement dated December 28, 1981 between the Company and Frost National Bank
                      of San Antonio (previously filed as an Exhibit to the Company's 1983 Annual Report on
                      Form 10-K, File No. 2-70145).

 (10)(h)              Second Amendment dated April 13, 1984 to the Loan Agreement dated December 28,
                      1981 between the Company and Frost National Bank of San Antonio (previously filed as
                      an Exhibit to the Company's 1983 Annual Report on Form 10-K, File No. 2-70145).

 (10)(i)              Modification of General Guaranty dated April 13, 1984 between the Company and Frost
                      National Bank of San Antonio modifying the Company's guarantee of the Promissory Note
                      of South Texas/1200, Ltd. (previously filed as an Exhibit to the Company's 1983 Annual
                      Report on Form 10-K, File No. 2-70145).
</TABLE>



<PAGE>   52


            SOUTH TEXAS DRILLING & EXPLORATION, INC. AND SUBSIDIARIES

<TABLE>

 <S>                  <C>
 (10)(j)              The Company's 1983 Non-qualified Stock Option Plan (previously filed as an Exhibit to
                      the Company's 1983 Annual Report on Form 10-K, File No. 2-70145).

 (10)(k)              Letter from Hoy M. Booker deferring enforcement of legal remedies (previously filed as
                      an Exhibit to the Company's 1983 Annual Report on Form 10-K, File No. 2-70145).

 (10)(l)              Letter from R. L. Kirkwood deferring enforcement of legal remedies (previously filed as
                      an Exhibit to the Company's 1983 Annual Report on Form 10-K, File No. 2-70145).

 (10)(m)              Modification of Representation and Warranty of Second Amendment dated April 13, 1984
                      to the Loan Agreement dated December 28, 1981 between the company and Frost National
                      Bank of San Antonio (previously filed as an Exhibit to the Company's 1984 Annual Report
                      on Form 10-K, File No. 2-70145).

 (10)(n)              Agreement and Release dated January 3, 1986, between the Company and Hoy M. Booker
                      and Robert L. Kirkwood regarding the assignment of certain oil and gas properties in
                      satisfaction of certain promissory notes (previously filed as an Exhibit to the Company's
                      1985 Annual Report on Form 10-K, File No. 2-70145).

 (10)(o)              Debt Cancellation Agreement dated March 24, 1986 between the company and Frost
                      National Bank of San Antonio (previously filed as an Exhibit to the Company's 1985
                      Annual Report on Form 10-K, File No. 2-70145).

 (10)(p)              Amendment #1 To Debt Cancellation Agreement dated March 24, 1986 between the
                      Company and Frost National Bank of San Antonio (previously filed as an Exhibit to the
                      Company's 1986 Annual Report on Form 10-K, File No. 2-70145).

 (10)(q)              Amendment #2 To Debt Cancellation Agreement dated March 24, 1986 between the
                      Company and Frost National Bank of San Antonio (previously filed as an Exhibit to the
                      Company's 1986 Annual Report on Form 10-K, File No. 2-70145).

 (10)(r)              Modification and Extension of Term Note dated April 16, 1986 between the Company and
                      Frost National Bank of San Antonio (previously filed as an Exhibit to the Company's 1986
                      Annual Report on Form 10-K, File No. 2-70145).

 (10)(s)              Bill of Sale of Oil and Gas Drilling Rigs dated April 16, 1986 between the Company and
                      Frost National Bank of San Antonio (previously filed as an Exhibit to the Company's 1986
                      Annual Report on Form 10-K, File No. 2-70145).

 (10)(t)              Convertible subordinated note dated January 1, 1989 between the Company and Frost
                      Bank (previously filed as an Exhibit to the Company's 1989 Annual Report on Form 10-K,
                      File No. 2-70145).

 (10)(u)              Convertible subordinated note dated November 1, 1988 between the Company and Larry
                      Temple (previously filed as an Exhibit to the Company's 1989 Annual Report on Form 10-
                      K, File No. 2-70145).
</TABLE>



<PAGE>   53


            SOUTH TEXAS DRILLING & EXPLORATION, INC. AND SUBSIDIARIES
<TABLE>


<S>                  <C>
(10)(v)              Rig Lease and Refurbishing Agreement (Rig 11) dated September 21, 1990 between the
                     Company and LB Sales and Leasing, Inc. (previously filed as an Exhibit to the Company's
                     1991 Annual Report on Form 10-K, File No. 2-70145).

(10)(w)              Rig Lease and Refurbishing Agreement (Rig 12) dated September 21, 1990 between the
                     Company and LB Sales and Leasing, Inc. (previously filed as an Exhibit to the Company's
                     1991 Annual Report on Form 10-K, File No. 2-70145).

(10)(x)              Revised and restated rig Lease and Refurbishing Agreement regarding Rig 11 and Rig 12
                     dated September 27, 1991 between the Company and LB Sales and Leasing, Inc.
                     (previously filed as an Exhibit to the Company's 1992 Annual Report on Form 10-K, File
                     No. 2-70145).

(10)(y)              Settlement Agreement dated November 13, 1991 between the Company and Frio Drilling
                     Company (previously filed as an Exhibit to the Company's 1992 Annual Report on Form
                     10-K, File No. 2-70145).

(10)(z)              Settlement Agreement dated December 29, 1994 between the Company and L. B. Sales
                     and Leasing, Inc. ( previously filed as an Exhibit to the Company's 1995 Annual Report
                     on Form 10-K, File No. 2-70145).

(10)(aa)             Executive Employment Agreement dated May 1, 1995 between the Company and Wm.
                     Stacy Locke (previously filed as an Exhibit to the Company's 1995 Annual Report on
                     Form 10-K, File No. 2-70145).

(10)(bb)             Form of Loan and Security Agreement dated May 8, 1996 between the Company and
                     Finova Capital Corporation (previously filed as an Exhibit to the Company's 1996 Annual
                     Report on Form 10-K, File No. 2-70145).

(10)(cc)             Form of Schedule to Loan and Security Agreement dated May 8, 1996  between the
                     Company and Finova Capital Corporation (previously filed as an Exhibit to the Company's
                     1996 Annual Report on Form 10-K, File No. 2-70145).

(10)(dd)             Asset Purchase Agreement May 23, 1997 between the Company and San Patricio
                     Corporation (previously filed as an Exhibit to the Company's 1996 Annual Report on Form
                     10-K, File No. 2-70145).

(10)(ee)             Non-Statutory Stock Option Agreement dated June 18, 1997 between the Company and
                     San Patricio Corporation (previously filed as an Exhibit to the Company's 1996 Annual
                     Report on Form 10-K, File No. 2-70145).

(10)(ff)             Second Amended Certificate of Designation, Reducing The Number Of Shares Formerly
                     Designated Series A, Series B and Series C Preferred Stock to Zero and Designating The
                     Voting Powers, Preferences and Rights of A New Series A 8% Convertible Preferred
                     Stock  dated April 15, 1997  (previously filed as an Exhibit to the Company's 1996 Annual
                     Report on Form 10-K, File No. 2-70145).
</TABLE>



<PAGE>   54


<TABLE>

<S>            <C>
(10)(gg)       Third Amended Certificate of Designation, Correcting An Error In The Second Amended
               Certificate of Designation and Designating the Voting Powers, Preferences And Right Of
               A New Series B 8% Convertible Preferred Stock dated June 9, 1998.

(10)(hh)       First Amendment To Loan And Security Agreement dated May 8, 1996 between the
               Company and Finova Capital Corporation dated June 18, 1997.

(10)(ii)       Second Amendment To Loan and Security Agreement dated May 8, 1996 between the
               Company and Finova Capital Corporation.

(22)           Subsidiaries of the registrant (previously filed as an Exhibit to the Company's 1992 Annual
               Report on Form 10-K, File No. 2-70145).

(27)           Financial Data Schedule

</TABLE>





<PAGE>   1
                   THIRD AMENDED CERTIFICATE OF DESIGNATION,
   CORRECTING AN ERROR IN THE SECOND AMENDED CERTIFICATE OF DESIGNATION AND
                  DESIGNATING THE VOTING POWERS, PREFERENCES
         AND RIGHTS OF A NEW SERIES B 8% CONVERTIBLE PREFERRED STOCK OF
                    SOUTH TEXAS DRILLING & EXPLORATION, INC.
                              A Texas Corporation

                                                               FILED
                                                        In the Office of the
                                                     Secretary of State of Texas
                                                             Jan 14, 1998
                                                        Corporations Section
                                                                                

         South Texas Drilling & Exploration, Inc., a Texas corporation (the
"Corporation"), pursuant to Article 2.13 of the Business Corporation Act of the
State of Texas, certifies that the Board of Directors of the Corporation at a
meeting occurring December 18, 1997, at which a quorum was present and acting
throughout, duly adopted the following resolution providing for a new Series B
8% Convertible Preferred Stock consisting of 184,615 shares.

         RESOLVED,

                                       I.

         All references to Series A 8% Convertible Preferred Stock in the
Second Amended Certificate of Designation as having a par value of $2.00 per
share is hereby corrected to $1.00 par value per share.  In addition, Section
2(E)(1) is corrected in its entirety to read as follows:  "(1)  Payment.
Holders of redeemed shares shall be paid in cash an amount equal to $2.00 plus
cumulated but unpaid dividends, and no more."

                                      II.

                    SERIES B 8% CONVERTIBLE PREFERRED STOCK

         1.      Designation.  The series of Preferred Stock established by
this resolution shall be designated "Series B 8% Convertible Preferred Stock,"
of which 184,615 shares shall be designated having a par value of $1.00 per
share.
<PAGE>   2
         2.      Preferences, Limitations and Rights of Series B 8% Convertible
Preferred Stock.

         (A)  General.  Except as otherwise expressly provided by law, shares
of Series B 8% Convertible Preferred Stock shall have only the preferences and
relative rights expressly stated in this Certificate of Designation.

         (B)  Dividends.

                 (1)  Amount; Time.  Each share of Series B 8% Convertible
Preferred Stock at the time outstanding shall be entitled to receive, when and
as declared by the Board of Directors, out of any funds legally available
therefor, dividends at the rate of 8% of the initial liquidation value of
$16.25 for each share per annum and no more.

                 (2)  Cumulativity.  Dividends payable in respect of Series B
8% Convertible Preferred Stock shall accrue from day to day, whether or not
earned or declared and shall be cumulative.  Accumulation of dividends on the
Series B 8% Convertible Preferred Stock shall not bear interest.

                 (3)  Priority Over Common Stock; Restriction on Purchases of
Common Stock.  No dividend shall be declared or paid on the Corporation's
Common Stock ("Common Stock"), unless any dividends on outstanding Series B 8%
Convertible Preferred Stock for the current dividend period shall have been
declared and paid.  No Common Stock shall be purchased for cash or tangible
assets by the Corporation so long as any Series B 8% Convertible Preferred
Stock remains outstanding.





                                       2
<PAGE>   3
         (C)  Liquidation Preference.  In the event of dissolution,
liquidation, or winding up of the Corporation (whether voluntary or
involuntary), after payment or provision for payment of debts and after the
payment to of the Liquidation Preference owing to the holders of the
Corporation's Series A 8% Convertible Preferred Stock, but before any
distribution to the holders of Common Stock, the holders of Series B
Convertible Preferred Stock then outstanding shall be entitled to receive
$16.25 per share, and an amount per share equal to cumulated but unpaid
dividends in respect of such shares of Series B 8% Convertible Preferred Stock,
and no more.  All remaining assets shall be distributed pro rata among the
holders of Common Stock.  If the assets distributable among the holders of
Series B 8% Convertible Preferred Stock are insufficient to permit full payment
to them, the entire remaining assets (after the payment of or provision for
payment of debts and after the payment to of the Liquidation Preference owing
to the holders of the Corporation's Series A 8% Convertible Preferred Stock)
shall be distributed among the holders of the Series B 8% Convertible Preferred
Stock.  Neither the consolidation, merger, or reorganization of the Corporation
with any other corporation or corporations, nor the purchase or redemption by
the Corporation of any of its outstanding shares shall be deemed to be
dissolution, liquidation, or winding up within the meaning of this paragraph.

         (D)  Redemption at Option of Corporation.

                 (1)  Right; Method.  All of the Series B Convertible Preferred
Stock may be redeemed at or following the first





                                       3
<PAGE>   4
anniversary of the issuance of any such Series B Convertible Preferred Stock at
the option of the Corporation, by resolution of the Board of Directors,
provided that (i) the Thirty Day Average Stock Transaction Price of the
Corporation's Common Stock shall equal or exceed $5.00 for the Thirty Day
Trading Period immediately preceding the sending of notice of redemption as
provided below, and (ii) to the extent that any such redemption may occur
during the three year period following the issuance of such Series B
Convertible Preferred Stock, during such Thirty Day Trading Period, the
Corporation's Common Stock is listed on the NASDAQ Stock Market, the NASDAQ
Small Cap quotation system, the American Stock Exchange or any successor to
such trading exchanges.  The "Thirty Day Average Stock Transaction Price" shall
mean the average price, without regard to volume, of the last reported trade of
the Corporation's Common Stock on any nationally recognized exchange or trading
system such as the NASDAQ Electronic Bulletin Board or the inter-broker trading
system commonly known as the "pink sheets".  The "Thirty Day Trading Period"
shall mean the period which consists of 30 consecutive days, whether or not any
shares of Common Stock of the Corporation are actually traded in each of such
days, when the exchanges or trading systems in which the Corporation's Common
Stock is trading are open, without regard to weekends, holidays or other days
when such exchanges or trading systems are closed.

                 (2)  Notice.  Notice shall be in writing and given to the
holders of shares to be redeemed, either personally or by mail, not





                                       4
<PAGE>   5
less than sixty nor more than ninety days before the date fixed for redemption.

         (E)  Manner of Payment Upon Any Redemption.

                 (1)  Payment.  Holders of redeemed shares shall be paid in
cash an amount equal to $16.25 plus cumulated but unpaid dividends, and no
more.

                 (2)  Provision for Payment.  On or before the date fixed for
redemption, the Corporation may provide for payment of a sum sufficient to
redeem the shares called for redemption either (a) by setting aside the sum,
separate from its other funds, in trust for the benefit of the holders of the
shares to be redeemed, or (b) by depositing such sum in a bank or trust company
(either one in Texas having capital and surplus of at least $20,000,000
according to its latest statement of condition, or one anywhere in the United
States duly appointed and acting as transfer agent of the Corporation) as a
trust fund, with irrevocable instructions and authority to the bank or trust
company to give or complete the notice of redemption and to pay to the holders
of the shares to be redeemed, on or after the date fixed for redemption, the
redemption price on surrender of their respective share certificates.  The
holders of shares to be redeemed may be evidenced by a list certified by the
Corporation (by its president or a vice president and by its secretary or an
assistance secretary) or by its transfer agent.  If the Corporation so provides
for payment, then from and after the date fixed for redemption (a) the shares
shall be deemed to be redeemed, (b) such setting aside or deposit shall be
deemed to constitute full payment





                                       5
<PAGE>   6
for the shares, (c) the shares shall no longer be deemed to be outstanding, (d)
the holders thereof shall cease to be shareholders with respect to such shares,
and (e) the holders shall have no rights with respect thereto except the right
to receive (without interest) their proportionate shares of the funds so set
aside or deposited upon surrender of their respective certificates.  Any
interest accrued on funds so set aside or deposited shall belong to the
Corporation.  If the holders of the shares do not, within six years after such
deposit, claim any amount so deposited for redemption thereof, the bank or
trust company shall upon demand pay over to the Corporation the balance of the
funds so deposited, and the bank or trust company shall thereupon be relieved
of all responsibility to such holders.  If fewer than all outstanding shares of
Series B Convertible Preferred Stock are to be redeemed, the Corporation shall
determine which shares shall be redeemed by lot, pro rata, or other methods
determined to be appropriate by the Corporation.

         (F)  Status of Redeemed Shares.  Shares of Series B 8% Convertible
Preferred Stock which are redeemed shall be cancelled and shall be restored to
the status of authorized but unissued shares.

         (G)  Purchase.  Except as specified in Section 2(B)(3) of this
Designation, nothing herein shall limit the right  of the Corporation to
purchase any of its outstanding shares in accordance with law, by public or
private transaction.





                                       6
<PAGE>   7
         (H)  Voting.  Each share of Series B 8% Convertible Preferred Stock
shall have the same voting rights as the shares of the Corporation's Common
Stock into which it may be converted.

         (I)  Rights of Conversion.  The holders of Series B 8% Convertible
Preferred Stock shall have the conversion rights as follows:

                 (1)  Right to Convert.

                          (i)  Initial Rights.  Each share of Series B 8%
         Convertible Preferred Stock shall be convertible, at the option of the
         holder thereof, at any time after the date of issuance of such share
         and prior to the close of business on any date fixed for redemption
         which applies to such share, at the office of the Corporation or any
         transfer agent for the Series B 8% Convertible Preferred Stock, into
         five shares of Common Stock in respect of each share of Series B 8%
         Convertible Preferred Stock and one share of Common Stock for each
         $1.625 of due but unpaid dividends on such share of Series B 8%
         Convertible Preferred Stock converted; provided, however, that the
         number of shares of Common Stock into which each share of Series B 8%
         Convertible Preferred Stock may be converted shall be subject to
         adjustment as follows:

                          (ii)  Rights at Three Years.  If, at the third
         anniversary of the date of issuance of any Series B 8% Convertible
         Preferred Stock, the Thirty Day Average Stock Transaction Price of
         Common Stock during the immediately preceding Thirty Day Trading
         Period (the "Three Year





                                       7
<PAGE>   8
         Conversion Price") is below $3.25, the number of shares of Common
         Stock to be received upon conversion of each share of Series B 8%
         Convertible Preferred Stock shall be determined by dividing the sum of
         $16.25 by the Three Year Conversion Price, and to the extent of any
         due but unpaid dividends on shares of Series B 8% Convertible
         Preferred Stock converted, the amount of such due but unpaid dividends
         shall likewise be convertible into Common Stock at a rate of $1.625 or
         the amount of the Three Year Conversion Price, whichever is lesser,
         for each share of Common Stock (the "Three Year Conversion Rate").
         The Three Year Conversion Rate shall remain in effect thereafter
         unless adjusted at the 7th anniversary date of the issuance of any
         Series B 8% Convertible Preferred Stock.

                 (iii)  Rights at Seven Years.  If, at the seventh anniversary
         of the date of issuance of any Series B 8% Convertible Preferred
         Stock, the Thirty Day Average Stock Transaction Price of Common Stock
         during the immediately preceding Thirty Day Trading Period (the "Seven
         Year Conversion Price") is below the Three Year Conversion Price, the
         number of shares of Common Stock to be received upon conversion of
         each share of Series B 8% Convertible Preferred Stock shall be
         determined by dividing the sum of $16.25 by the Seven Year Conversion
         Price, and to the extent of any due but unpaid dividends on shares of
         Series B 8% Convertible Preferred Stock converted, the amount of such
         due but unpaid dividends shall likewise be convertible into Common
         Stock at





                                       8
<PAGE>   9
         a rate of $1.625 or the amount of the Seven Year Conversion Price,
         whichever is lesser, for each share of Common Stock (the "Seven Year
         Conversion Rate").  The Seven Year Conversion Rate shall remain in
         effect at all times from and after the seventh anniversary date of the
         issuance of any Series B 8% Convertible Preferred Stock.

                 (iv)  Conversion After Redemption Notice.  In the event of a
         call for redemption of any shares of Series B 8% Convertible Preferred
         Stock, the conversion rights shall terminate as to the shares
         designated for redemption at the close of business on the date fixed
         for redemption, unless default is made in payment of the redemption
         price.

                 (2)  Mechanics of Conversion.  Before any holder of Series B
8% Convertible Preferred Stock shall be entitled to convert the same into
shares of Common Stock, he shall surrender the certificate or certificates
therefor, duly endorsed, at the office of the Corporation or of any transfer
agent for the Series B 8% Convertible Preferred Stock, and shall give written
notice by mail, postage prepaid, to the Corporation at its principal corporate
office, of the election to convert the same and shall state therein the name or
names in which the certificate or certificates for shares of Common Stock are
to be issued.  The Corporation shall, as soon as practicable thereafter, issue
and deliver at such office to such holder of Series B 8% Convertible Preferred
Stock, or to the nominee or nominees of such holder, a certificate or
certificates for the number of shares of Common





                                       9
<PAGE>   10
Stock to which such holder shall be entitled as aforesaid.  Such conversion
shall be deemed to have been made immediately prior to the close of business on
the date of such surrender of the shares of Series B 8% Convertible Preferred
Stock to be converted, and the person or persons entitled to receive the shares
of Common Stock issuable upon such conversions shall be treated for all
purposes as the record holder or holders of such shares of Common Stock as of
such date.

                 (3)  Adjustments in the Average Stock Transaction Price
Thresholds and in the Number of Shares Issuable Upon Conversion.  The Average
Stock Transaction Price thresholds referred to in Section 2D, and 2I (the
"Price Thresholds") and the number of shares of Common Stock issuable upon the
conversion of Series B 8% Convertible Preferred Stock shall be subject to
adjustments from time to time as follows:

                 (i)  In the event the Corporation should at any time or from
         time to time fix a record date for the effectuation of a split or
         subdivision of the outstanding shares of Common Stock the
         determination of holders of Common Stock entitled to receive a
         dividend or other distribution payable in additional shares of Common
         Stock or other securities or rights convertible into, or entitling the
         holder thereof to receive directly or indirectly, additional shares of
         Common Stock (hereinafter referred to as "Stock Equivalents") without
         payment of any consideration by such holder for the additional shares
         of Common Stock or the Stock Equivalents (including the





                                       10
<PAGE>   11
         additional shares of Common Stock issuable upon conversion or exercise
         thereof), then, as of such record date (or the date of such dividend
         distribution, split or subdivision if no record date is fixed), the
         shares of Common Stock into which the Series B 8% Convertible
         Preferred Stock may be converted shall include any such Stock
         Equivalents which may be issued from time to time to the same effect
         as if the Series B 8% Convertible Preferred Stock had been converted
         into shares of Common Stock on the date of its issuance.  Likewise,
         the Price Thresholds shall as of such record date, apply to the Common
         Stock plus the Stock Equivalents issued in respect of such Common
         Stock on such record date.

                 (ii)  If the number of shares of Common Stock outstanding at
         any time is decreased by a combination of the outstanding shares of
         Common Stock, then, following the record date of such combination, the
         conversion ratio for the Series B 8% Convertible Preferred Stock shall
         be appropriately adjusted so that the number of shares of Series B 8%
         Convertible Preferred Stock surrendered on conversion for each two
         shares of Common Stock to be issued shall be increased in proportion
         to such decrease in outstanding shares of Common Stock.  Likewise, the
         Price Thresholds shall be increased in proportion to such decrease in
         outstanding shares of Common Stock.

                 (iii)  In the case of any reorganization of the Corporation or
         consolidation of the Corporation with or any merger of the Corporation
         with or into another entity or in





                                       11
<PAGE>   12
         case of any sale or transfer to another entity of the property of the
         Corporation as an entirety or substantially as an entirety, the
         corporation or other entity resulting from such reorganization, or
         consolidation or surviving such merger or to which such sale or
         transfer shall be made, as the case may be, shall make suitable
         provisions so that the Series B 8% Convertible Preferred Stock shall
         thereafter be convertible into the kind and amount of shares of common
         stock or other securities or property receivable upon such
         reorganization, consolidation, merger, sale or transfer by the holder
         of the number of shares of Common Stock into which such shares of
         Series B 8% Convertible Preferred Stock might have been converted
         immediately prior to such consolidation, merger, sale or transfer.
         Likewise, the Price Thresholds shall apply to the shares of common
         stock or other securities or property receivable upon such
         reorganization, merger, consolidation, sale or transfer, as
         appropriately adjusted to reflect the amount of common stock or other
         securities or property  received by a holder of one share of Common
         Stock upon such reorganization, merger, consolidation, transfer or
         sale.  The provisions of this subparagraph (iii) shall similarly apply
         to successive reorganizations, consolidations, mergers, sales or
         transfers.

                 (iv)  In the event that the Corporation effects a split,
         subdivision of its Common Stock, or in the event that the number of
         shares of its Common Stock is decreased by a





                                       12
<PAGE>   13
         combination of the outstanding shares of Common Stock, the Price
         Thresholds shall be appropriately adjusted so that the Price
         Thresholds are raised or decreased in proportion to the number of
         outstanding shares of the Corporation's Common Stock resulting from
         such split, subdivision or combination as compared to the number of
         shares of Common Stock outstanding immediately prior to such split,
         subdivision or combination.

         3.      No Senior Capital Stock Authorized as to Dividend Priority or
Liquidation.  The Corporation shall not authorize or issue, or obligate itself
to authorize or issue, any other equity security senior to the Series B 8%
Convertible Preferred Stock as to priority of payment of dividends or
liquidation preference.


         IN WITNESS WHEREOF, said South Texas Drilling & Exploration, Inc. has
caused this Certificate to be signed by Wm. Stacy Locke, its President, and
attested by Mary Lou Kilgore, its Secretary, this 9th day of January, 1998.


                                           SOUTH TEXAS DRILLING &
                                           EXPLORATION, INC.



                                           By: /s/ WM. STACY LOCKE
                                              --------------------------------
                                               Wm. Stacy Locke, President


ATTEST:



/s/ MARY LOU KILGORE
- --------------------------------
Mary Lou Kilgore, Secretary





                                       13

<PAGE>   1

                 FIRST AMENDMENT TO LOAN AND SECURITY AGREEMENT


        THIS FIRST AMENDMENT TO LOAN AND SECURITY AGREEMENT (the "Amendment"),
dated as of June 18, 1997, is entered into between FINOVA CAPITAL CORPORATION,
a Delaware corporation ("FINOVA"), with a place of business at 311 South Wacker
Drive, Suite 4400, Chicago, Illinois 60606-6618, and SOUTH TEXAS DRILLING &
EXPLORATION, INC., a Texas corporation ("Borrower"), with its chief executive
office located at 9310 Broadway, Building I, San Antonio, Texas 78217.

                                    RECITAL

        A.       Borrower and FINOVA have previously entered into that certain
Loan and Security Agreement and related Schedule to Loan and Security
Agreement, each dated as of May 8, 1996 (collectively, the "Loan Agreement"),
pursuant to which FINOVA has made certain loans and financial accommodations
available to Borrower. Terms used herein without definition shall have the
meanings ascribed to them in the Loan Agreement.

        B.       Borrower has requested FINOVA to provide additional financing
to fund the acquisition of certain assets to be acquired from San Patricio
Corporation, a Texas corporation ("San Patricio"), to fund the acquisition of a
mud pump, to extend the term of the credit facilities, to modify certain
covenants and to adjust the interest rates applicable to the credit facilities.

        C.       FINOVA is willing to further amend the Loan Agreement under
the terms and conditions set forth in this Amendment. Borrower is entering into
this Amendment with the understanding and agreement that, except as
specifically provided herein, none of FINOVA's rights or remedies as set forth
in the Loan Agreement is being waived or modified by the terms of this
Amendment.

        NOW, THEREFORE, in consideration of the foregoing and the mutual
covenants herein contained, and for other good and valuable consideration, the
receipt and sufficiency of which are hereby acknowledged, the parties hereby
agree as follows:

        1.       FINOVA's address for all purposes of the Loan Agreement is
changed to:  311 South Wacker Drive, Suite 4400, Chicago, Illinois 60606-6618.

        2.       The term "Term Loan" is hereby amended to be read as a
collective term to include both Term Loan A and Term Loan B as defined in the
Schedule as amended by this Amendment, and "Term Loan" shall be read to include
both Term Loan A and Term Loan B unless the context otherwise requires a more
limited reading to mean, individually, either Term Loan A or Term Loan B.
<PAGE>   2
        3.       The second to the last sentence of Section 1.1 of the Loan
Agreement is hereby amended to read as follows:

                 "The maximum aggregate amount of Loans available to Borrower
                 from time to time hereunder shall be reduced dollar for
                 dollar, for the period from the Closing Date through June 17,
                 1997, from the Initial Total Facility Amount upon amortization
                 of the original principal amount of Term Loan A; and for the
                 period after June 18, 1997, from the Subsequent Total Facility
                 Amount upon amortization of both the remaining outstanding
                 principal amount of Term Loan A as of June 18, 1997, and the
                 original principal amount of Term Loan B."

        4.       Section 4.1 of the Loan Agreement is hereby amended to read as
follows:

                 "4.1 Security Interest in the Collateral.  To secure the
                 payment and performance of the Obligations when due, Borrower
                 hereby grants to FINOVA a security interest in all of
                 Borrower's now owned or hereafter acquired or arising
                 Inventory, Equipment, Receivables, and General Intangibles,
                 including, without limitation, all of Borrower's deposit
                 accounts, money, any and all property now or at any time
                 hereafter in FINOVA's possession (including claims and credit
                 balances), investment property, proceeds of letters of credit,
                 and all proceeds (including proceeds of any insurance
                 policies, proceeds of proceeds and claims against third
                 parties), all products and all books and records related to
                 any of the foregoing (all of the foregoing, together with all
                 other property in which FINOVA may be granted a lien or
                 security interest, is referred to herein, collectively, as the
                 "Collateral")."

        5.       The following definitions are added to Section 18.1 of the
Loan Agreement:

                 "'San Patricio' means San Patricio Corporation, a Texas
                 corporation."

                 "'San Patricio Assets' has the meaning set forth in the
                 Schedule."

        6.       The definition of Initial Total Facility Amount as set forth
in the Schedule is amended to read as follows:

                 "INITIAL TOTAL FACILITY AMOUNT (SECTION 1.1), for the period
                 from the Closing Date through June 17, 1997:

                          $1,750,000"

        7.       The following definition of Subsequent Total Facility Amount
is added to the Schedule following the definition of Initial Total Facility
Amount:


                                      2
<PAGE>   3
                 "SUBSEQUENT TOTAL FACILITY AMOUNT (SECTION 1.1), for the
                 period following June 17, 1997:  The outstanding principal
                 balance of Term Loan A as of June 18, 1997 plus $1,550,000."

        8.       The definition of Term Loan as set forth in the Schedule is
amended to read as follows:

                 "B.      TERM LOAN (collectively, Term Loan A and Term Loan B,
                 or either Term Loan A or Term Loan B, in each case as the
                 context requires):

                          (1)     TERM LOAN A:  A term loan in the original
                 principal amount of One Million Two Hundred Fifty Thousand
                 Dollars ($1,250,000) (the "Term Loan A"), which shall be
                 evidenced by and payable in accordance with the terms of the
                 Term Loan A Amended and Restated Secured Promissory Note.

                          (2)     TERM LOAN B:  A term loan in the original
                 principal amount of One Million Fifty Thousand Dollars
                 ($1,050,000) (the "Term Loan B"), which shall be evidenced and
                 payable in accordance with the terms of the Term Loan B
                 Secured Promissory Note, the principal amount thereof advanced
                 by FINOVA to fund Borrower's purchase of:  (i) certain assets
                 of San Patricio at a cost to Borrower of $1,500,000, $800,000
                 of the purchase price funded by Term Loan B, $100,000 from the
                 Borrower's cash-on-hand, $300,000 in assigned value of the
                 common stock of the Borrower issued to San Patricio, and the
                 balance of $300,000 funded through Subordinated Debt obtained
                 by the Borrower from San Patricio, and (ii) a mud pump at a
                 cost to Borrower of $284,212.50, $250,000 of which shall be
                 funded by Term Loan B."

        9.       The first sentence of the paragraph entitled "Interest" under
the INTEREST AND FEES Section of the Schedule is hereby amended to read as
follows:

                 "Borrower shall pay FINOVA interest on the daily outstanding
                 balance of Borrower's Receivable Loans account at a per annum
                 rate of two and three-quarters (2.75) percentage points in
                 excess of the rate of interest announced publicly by
                 Citibank, N.A., from time to time as its "base rate" (or any
                 successor thereto), which may not be such institution's lowest
                 rate (the "Base Rate") for the period from the Closing Date
                 through June 17, 1997, and thereafter at a per annum rate of
                 two and one-quarter (2.25) percentage points in excess of the
                 Base Rate."





                                       3
<PAGE>   4
        10.      The item "Permitted Incumbrances" under the BORROWER
INFORMATION Section of the Schedule is hereby amended to read as follows:

                 "Permitted Encumbrances (Section 18.1):

                          (1)     See Exhibit 18.1 attached hereto and
                 incorporated herein by this reference.

                          (2)     Subordinated Debt in the original principal
                 amount of $300,000 advanced by San Patricio to Borrower to
                 fund the balance of the purchase price of the assets to be
                 acquired by Borrower from San Patricio Corporation (the "San
                 Patricio Assets") not funded through Term Loan B, which
                 indebtedness:  (a) shall be subordinate to the Obligations
                 pursuant to, and repayable in accordance with, the terms and
                 conditions of an Intercreditor and Subordination Agreement
                 between San Patricio and FINOVA, and acknowledged to by the
                 Borrower, the terms and conditions of which shall be
                 acceptable to FINOVA in its sole discretion, and (b) may be
                 secured by Borrower's grant of a second security interest in
                 the San Patricio Assets subordinate to the prior security
                 interest of FINOVA in the San Patricio Asserts, pursuant to a
                 security agreement between San Patricio and Borrower the terms
                 and conditions of which shall be acceptable to FINOVA in its
                 sole discretion."

        11.      The Total Debt Service Coverage financial covenant set forth
under the FINANCIAL COVENANTS Section of the Schedule is amended to read as
follows:

                 "Total Debt Service Coverage.

                          Borrower shall maintain Total Debt Service Coverage
                          of not less than 1.0 to 1.0."

        12.      The Capital Expenditures covenant set forth under the NEGATIVE
COVENANTS Section of the Schedule is amended to read as follows:

                 "Capital Expenditures.

                          Borrower shall not make or incur any Capital
                          Expenditure of any kind if, after giving effect
                          thereto, the aggregate amount of all such Capital
                          Expenditures by Borrower in any fiscal year
                          (beginning with the March 31, 1997 fiscal year) would
                          exceed Seven Hundred Twenty Thousand Dollars
                          ($720,000).  However, for the purposes of calculating
                          the amount of such Capital Expenditures, the San
                          Patricio Assets and the mud pump purchased by
                          Borrower for $284,212.50 shall be excluded."





                                       4
<PAGE>   5
        13.      The Compensation covenant set forth under the NEGATIVE
COVENANTS Section of the Schedule is amended to read as follows:

                 "Compensation.

                          Borrower shall not pay total compensation, including
                          salaries, withdrawals, fees, bonuses, commissions,
                          drawing accounts and other payments, whether directly
                          or indirectly, in money or otherwise, during any
                          fiscal year to all of Borrower's executives, officers
                          and directors (or any relative thereof) in an amount
                          in excess of $350,000, in the case of Borrower's 1998
                          fiscal year, or in excess of one hundred twenty
                          percent (120%) of the total compensation paid by
                          Borrower to such individuals during its immediately
                          preceding fiscal year, in the case of each subsequent
                          fiscal year of Borrower."

        14.      The TERM Section of the Schedule is hereby amended to read as
follows:

                 "The initial term of this Agreement shall be from May 8, 1996
                 through June 1, 1999 (the "Initial Term") and shall be
                 automatically renewed for successive periods of one (1) year
                 each (each, a "Renewal Term"), unless earlier terminated as
                 provided in Section 16 or 17 above or elsewhere in this
                 Agreement."

        15.      The TERMINATION FEE Section of the Schedule is hereby amended
to read as follows:

                 "The Termination Fee provided in Section 16.4 shall be an
                 amount equal to the following percentage of the average daily
                 outstanding balance of the Receivable Loans for the 180-day
                 period (or lesser period if applicable) preceding the date of
                 termination:

                          (i)     three percent (3.0%), if such early
                 termination occurs on or prior to June 1, 1998;

                          (ii)    one percent (1.0%), if such early termination
                 occurs after June 1, 1998."

        16.      Effectiveness of this Amendment.  FINOVA must have received
the following items, in form and content acceptable to FINOVA, before this
Amendment is effective and before FINOVA is required to extend any credit to
Borrower as provided for by this Amendment. The date on which all of the
following conditions have been satisfied is the "Effective Date".

                 (a)      Amendment. This Amendment fully executed in a
        sufficient number of counterparts for distribution to FINOVA and
        Borrower.





                                       5
<PAGE>   6
                 (b)      Authorizations.  Evidence that the execution,
        delivery and performance by Borrower and each subordinating creditor of
        this Amendment and any instrument or agreement required under this
        Amendment have been duly authorized.

                 (c)      Representations and Warranties.  The Representations
        and Warranties set forth in the Loan Agreement must be true and
        correct.

                 (d)      Consent.  FINOVA has received counterparts of the
        Consent appended hereto (the "Consent") executed by Mr. Wm. Stacy
        Locke.

                 (e)      Intercreditor Agreement.  FINOVA and San Patricio
        shall have entered into an Intercreditor and Subordination Agreement
        with respect to the Subordinated Debt owed by Borrower to San Patricio,
        and acknowledged by Borrower, the terms and conditions of which shall
        be acceptable to FINOVA in its sole discretion.

                 (f)      Review of Subordinated Debt Documents.  All
        agreements, instruments and documents pertaining to the Subordinated
        Debt owed by Borrower to San Patricio shall have been delivered by
        Borrower to FINOVA and FINOVA shall have reviewed and found acceptable,
        in its sole discretion, such agreements, instruments and documents.

                 (g)      Other Required Documentation. All other documents and
        legal matters in connection with the transactions contemplated by this
        Agreement shall have been delivered or executed or recorded and shall
        be in form and substance satisfactory to FINOVA.

                 (h)      Payment of Modification Fee.  FINOVA shall have
        received from Borrower a Modification Fee of $5,500 for the processing
        and approval of this Amendment.

        17.      Representations and Warranties.  The Borrower represents and
warrants as follows:

                 (a)      Authority.  The Borrower has the requisite corporate
        power and authority to execute and deliver this Amendment and to
        perform its obligations hereunder and under the Loan Documents (as
        amended or modified hereby) to which it is a party.  The execution,
        delivery and performance by the Borrower of this Amendment, and the
        performance by Borrower of each Loan Document (as amended or modified
        hereby) to which it is a party have been duly approved by all necessary
        corporate action of Borrower and no other corporate proceedings on the
        part of Borrower are necessary to consummate such transactions.

                 (b)      Enforceability.  This Amendment has been duly
        executed and delivered by the Borrower.  This Amendment and each Loan
        Document (as amended or modified hereby) is the legal, valid and
        binding obligation of Borrower hereto or thereto, enforceable against
        Borrower in accordance with its terms, and is in full force and effect.





                                       6
<PAGE>   7
                 (c)      Representations and Warranties.  The representations
        and warranties contained in each Loan Document (other than any such
        representations or warranties that, by their terms, are specifically
        made as of a date other than the date hereof) are correct on and as of
        the date hereof as though made on and as of the date hereof.

                 (d)      No Default.  No event has occurred and is continuing
        that constitutes an Event of Default.

        18.      Choice of Law.  The validity of this Amendment, its
construction, interpretation and enforcement, the rights of the parties
hereunder, shall be determined under, governed by, and construed in accordance
with the internal laws of the State of Arizona governing contracts only to be
performed in that State.

        19.      Counterparts.  This Amendment may be executed in any number of
counterparts and by different parties and separate counterparts, each of which
when so executed and delivered, shall be deemed an original, and all of which,
when taken together, shall constitute one and the same instrument.  Delivery of
an executed counterpart of a signature page to this Amendment or the Consent by
telefacsimile shall be effective as delivery of a manually executed counterpart
of this Amendment or such Consent.

        20.      Due Execution.  The execution, delivery and performance of
this Amendment are within the power of Borrower, have been duly authorized by
all necessary corporate action, have received all necessary governmental
approval, if any, and do not contravene any law or any contractual restrictions
binding on Borrower.

        21.      Reference to and Effect on the Loan Documents.

                 (a)      Upon and after the effectiveness of this Amendment,
        each reference in the Loan Agreement to "this Agreement", "hereunder",
        "hereof" or words of like import referring to the Loan Agreement, and
        each reference in the other Loan Documents to "the Loan Agreement",
        "thereof" or words of like import referring to the Loan Agreement,
        shall mean and be a reference to the Loan Agreement as modified and
        amended hereby.

                 (b)      Except as specifically amended above, the Loan
        Agreement and all other Loan Documents, are and shall continue to be in
        full force and effect and are hereby in all respects ratified and
        confirmed and shall constitute the legal, valid, binding and
        enforceable obligations of Borrower to FINOVA.

                 (c)      The execution, delivery and effectiveness of this
        Amendment shall not, except as expressly provided herein, operate as a
        waiver of any right, power or remedy of FINOVA under any of the Loan
        Documents, nor constitute a waiver of any provision of any of the Loan
        Documents.

                 (d)      To the extent that any terms and conditions in any of
        the Loan Documents shall contradict or be in conflict with any terms or
        conditions of the Loan Agreement, after giving effect to this
        Amendment, such terms and conditions are





                                       7
<PAGE>   8
        hereby deemed modified or amended accordingly to reflect the terms and
        conditions of the Loan Agreement as modified or amended hereby.

        22.      Ratification.  Borrower hereby restates, ratifies and
reaffirms each and every term and condition set forth in the Loan Agreement, as
amended hereby, and the Loan Documents effective as of the date hereof.

        23.      Estoppel.  To induce FINOVA to enter into this Amendment and
to continue to make advances to Borrower under the Loan Agreement, Borrower
hereby acknowledges and agrees that, after giving effect to this Amendment, as
of the date hereof, there exists no Event of Default and no right of offset,
defense, counterclaim or objection in favor of Borrower as against FINOVA with
respect to the Obligations.

        IN WITNESS WHEREOF, the parties have entered into this Amendment as of
the date first above written.


BORROWER:                               FINOVA:

SOUTH TEXAS DRILLING &                  FINOVA CAPITAL CORPORATION
EXPLORATION, INC.


BY /s/ WM. STACY LOCKE                  BY /s/ THOMAS GIBBONS
  -------------------------               -----------------------------

TITLE President & CEO                   TITLE Vice President
     ----------------------                  --------------------------




                                       8
<PAGE>   9

                                    CONSENT

                           Dated as of June 18, 1997

     The undersigned hereby consents and agrees to the foregoing Amendment and
hereby confirms and agrees that his Confirmation and Support Agreement dated as
of May 8, 1996 in favor of FINOVA (the "Support Agreement") is, and shall
continue to be in, in full force and effect and is hereby ratified and
confirmed in all respects except that, upon the effectiveness of, and on and
after the date of said Amendment, each reference in the Support Agreement to
the Loan Agreement, "thereunder", "thereof" or words of like import referring
to the Loan Agreement, shall mean and be a reference to the Loan Agreement as
amended or modified by the said Amendment.





                                                    /s/ WM. STACY LOCKE
                                               --------------------------------
                                                        WM. STACY LOCKE





                                       9

<PAGE>   1


                SECOND AMENDMENT TO LOAN AND SECURITY AGREEMENT


        THIS SECOND AMENDMENT TO LOAN AND SECURITY AGREEMENT (this
"Amendment"), dated as of October 21, 1997, is entered into between FINOVA
CAPITAL CORPORATION, a Delaware corporation, ("FINOVA"), with a place of
business at 311 South Wacker Drive, Suite 4400, Chicago, Illinois 60606-6618,
and SOUTH TEXAS DRILLING & EXPLORATION, INC., a Texas corporation ("Borrower"),
with its chief executive office located at 9310 Broadway, Building I, San
Antonio, Texas 78217.

                                    RECITAL

        A.       Borrower and FINOVA have previously entered into that certain
Loan and Security Agreement dated as of May 8, 1996, as amended by that certain
First Amendment to Loan and Security Agreement dated as of June 18, 1997, (the
"Loan Agreement"), pursuant to which FINOVA has made certain loans and
financial accommodations available to Borrower.  Terms used herein without
definition shall have the meanings ascribed to them in the Loan Agreement.

        B.       Borrower has requested FINOVA to amend the Loan Agreement to
(i) increase the Subsequent Total Facility Amount, (ii) provide for a new term
loan in the original principal amount of Six Hundred Thousand Dollars
($600,000) to finance the acquisition of a Skytop Brewster N-46 drilling rig,
(iii) provide for a new credit facility to finance certain Capital Expenditures
of Borrower, and (iv) increase the amount of Capital Expenditures Borrower may
incur in any fiscal year.  Borrower has further requested that FINOVA waive
compliance by Borrower with the negative covenant pertaining to Capital
Expenditures.

        C.       FINOVA is willing to further amend the Loan Agreement and make
such waiver under the terms and conditions set forth in this Amendment.
Borrower is entering into this Amendment with the understanding and agreement
that, except as specifically provided herein, none of FINOVA's rights or
remedies as set forth in the Loan Agreement is being waived or modified by the
terms of this Amendment.

        NOW, THEREFORE, in consideration of the foregoing and the mutual
covenants herein contained, and for other good and valuable consideration, the
receipt and sufficiency of which are hereby acknowledged, the parties hereby
agree as follows:

        1.       Amendment to "Loans" Provisions.

                 (a)      The second to the last sentence of Section 1.1 of the
        Loan Agreement, entitled "Loan Facilities", is hereby amended in its
        entirety to read as follows:

                 "The maximum aggregate amount of Loans available to Borrower
                 from time to time hereunder shall be reduced dollar for
                 dollar, for the period from the Closing Date through June 17,
                 1997, from the Initial Total Facility Amount upon
<PAGE>   2
                 amortization of the original principal amount of Term Loan A;
                 and for the period after June 18, 1997, from the Subsequent
                 Total Facility Amount upon amortization of the remaining
                 outstanding principal amount of Term Loan A as of June 18,
                 1997, the original principal amount of Term Loan B, the
                 original principal amount of Term Loan C and the aggregate
                 amount borrowed under the Capital Expenditure Facility."

                 (b)      The definition set forth in the Schedule to the Loan
        Agreement under the heading "Subsequent Total Facility Amount (Section
        1.1)" is hereby amended in its entirety as follows:

                 "SUBSEQUENT TOTAL FACILITY AMOUNT (SECTION 1.1), for the
                 period following June 17, 1997:

                 The outstanding principal balance of Term Loan A as of June
                 18, 1997 plus Two Million Seven Hundred Fifty Thousand Dollars
                 ($2,750,000)."

                 (c)      Paragraph B of the Section in the Schedule to the
        Loan Agreement entitled "Loans (Section 1.2)" is hereby amended in its
        entirety as follows:

                 "B.      TERM LOAN:

                          (1)     TERM LOAN A:  A term loan in the original
                 principal amount of One Million Two Hundred Fifty Thousand
                 Dollars ($1,250,000) (the "Term Loan A"), which shall be
                 evidenced by and payable in accordance with the terms of the
                 Term Loan A Amended and Restated Secured Promissory Note (the
                 "Term Loan A Note").

                          (2)     TERM LOAN B:  A term loan in the original
                 principal amount of One Million Fifty Thousand Dollars
                 ($1,050,000) (the "Term Loan B"), which shall be evidenced and
                 payable in accordance with the terms of the Term Loan B
                 Secured Promissory Note (the "Term Loan B Note"), the
                 principal amount thereof advanced by FINOVA to fund Borrower's
                 purchase of:  (i) certain assets of San Patricio at a cost to
                 Borrower of $1,500,000, $800,000 of the purchase price funded
                 by Term Loan B, $100,000 from the Borrower's cash-on-hand,
                 $300,000 in assigned value of the common stock of the Borrower
                 issued to San Patricio, and the balance of $300,000 funded
                 through Subordinated Debt obtained by the Borrower from San
                 Patricio, and (ii) a mud pump at a cost to Borrower of
                 $284,212.50, $250,000 of which shall be funded by Term Loan
                 B."



                                      2
<PAGE>   3




                          (3)     TERM LOAN C:  A term loan in the original
                 principal amount of Six Hundred Thousand Dollars ($600,000)
                 (the "Term Loan C"), which shall be evidenced by and payable
                 in accordance with the terms of the Term Loan C Secured
                 Promissory Note (the "Term Loan C Note")."

        2.       Amendment to Negative Covenant Provisions.  The covenant set
forth in the Schedule to the Loan Agreement under the heading "Capital
Expenditures" in the Section entitled "Negative Covenants (Section 14)" is
hereby amended in its entirety to read as follows:



        "Capital Expenditures:    Borrower shall not make or incur any Capital
                                  Expenditure of any kind if, after giving
                                  effect thereto, the aggregate amount of all
                                  such Capital Expenditures by Borrower in any
                                  fiscal year would exceed One Million Five
                                  Hundred Thousand Dollars ($1,500,000).
                                  However, for the purposes of calculating the
                                  amount of such Capital Expenditures, (a) the
                                  San Patricio Assets, (b) the mud pump
                                  purchased by Borrower for $284,212.50, (c)
                                  the Skytop Brewster N-46 drilling rig and
                                  associated equipment purchased from Simmons
                                  Drilling Corp. on or about October 21, 1997
                                  and (d) the Capital Expenditures purchased
                                  with funds from the Capital Expenditure Loan
                                  Facility shall be excluded."

        3.       Amendment to the Definitions in the Loan Agreement.

                 (a)      The definition of "Term Loan" set forth in Section 18
        of the Loan Agreement is hereby amended in its entirety as follows:

                 "Term Loan" means collectively, Term Loan A, Term Loan B and
                 Term Loan C, or individually, Term Loan A, Term Loan B or Term
                 Loan C, in each case as the context requires."

                 (b)      The definition of "Term Loan Note" set forth in
        Section 18 of the Loan Agreement is hereby amended in its entirety as
        follows:

                 "Term Loan Note" means collectively, Term Loan Note A, Term
                 Loan Note B and Term Loan Note C, or individually, Term Loan
                 Note A, Term Loan Note B and Term Loan Note C, in each case as
                 the context requires."

        4.       Capital Expenditure Loan Facility.  FINOVA shall provide
non-revolving loans to Borrower, each of which shall be in a principal amount
of not less than Twenty Five Thousand Dollars ($25,000) and all of which shall
not exceed Six Hundred Thousand Dollars ($600,000) at any time, to facilitate
Borrower's acquisition of new Equipment for uses directly related to Borrower's
business operations as conducted as of the date of this Amendment.  Each loan
under this facility (individually, a "Capital Expenditure Loan" and





                                       3
<PAGE>   4



collectively, the "Capital Expenditure Loans") shall be evidenced by and
repayable in accordance with the terms of a Secured Capital Expenditure Loan
Note, the form of which is attached hereto as Exhibit A, executed by Borrower
to the order of FINOVA, (individually, a "Capital Expenditure Loan Note" and
collectively, the "Capital Expenditure Loan Notes").  Obligations owing under
the Capital Expenditure Loan Notes shall constitute Obligations and shall be
secured by all of the Collateral.

        Provided that no Event of Default has occurred and is continuing,
FINOVA will make Capital Expenditure Loans to Borrower upon Borrower's
presentment to FINOVA, in form and substance reasonably acceptable to FINOVA,
of invoices, delivery and installation receipts, and other evidence required by
FINOVA to document the acquisition, delivery, installation and use by Borrower
in its business of the specific items of Equipment to be acquired and financed
hereunder.  Upon approval by FINOVA, FINOVA will loan Borrower up to eighty
percent (80%) of the cost of the Equipment as reflected in the invoice
therefor; provided, however, the Capital Expenditure Loans shall be limited to
the cost of the purchased Equipment itself, and shall not include any ancillary
costs or expenses associated with the acquisition of such Equipment, such as,
but not limited to, sales tax, freight, duty and other transportation charges,
installation and delivery charges, brokerage commissions, maintenance costs,
and similar costs and expenses.

        5.       Waiver by FINOVA of Compliance with Capital Expenditure
Covenant.  Borrower hereby acknowledges that, it is not in compliance with the
negative covenant relating to Capital Expenditures set forth in Section 14 of
the Loan Agreement and that such non-compliance constitutes an Event of Default
under the Loan Agreement. FINOVA hereby waives compliance by Borrower with such
Capital Expenditures covenant before October 21, 1997, and shall not exercise
its rights and remedies under the Loan Agreement or applicable law in respect
of such Event of Default; provided, however, that FINOVA shall be free to
exercise all of its rights and remedies under the Loan Agreement in the event
of Borrower's violation or breach after October 21, 1997, of such Capital
Expenditures covenant.  The foregoing waiver is not a continuing waiver, and
FINOVA does not by this waiver amend the terms and provisions of the Loan
Agreement.  Upon the occurrence of any Event of Default after the date hereof,
or in the event that FINOVA learns of any Event of Default which occurred prior
to the date hereof (other than a breach of the Capital Expenditures covenant
before October 21, 1997), FINOVA shall be free to exercise any and all of its
various rights and remedies under the Loan Agreement.

        6.       Effectiveness of this Amendment.  FINOVA must have received
the following items, in form and content acceptable to FINOVA, before this
Amendment is effective and before FINOVA is required to extend any credit to
Borrower as provided for by this Amendment. The date on which all of the
following conditions have been satisfied is the "Closing Date".

                 (a)      Amendment. This Amendment fully executed in a
        sufficient number of counterparts for distribution to FINOVA and
        Borrower.





                                       4
<PAGE>   5




                 (b)      Authorizations.  Evidence that the execution,
        delivery and performance by Borrower and each guarantor or
        subordinating creditor of this Amendment and any instrument or
        agreement required under this Amendment have been duly authorized.

                 (c)      Representations and Warranties.  The representations
        and warranties set forth in the Loan Agreement must be true and
        correct.

                 (d)      Other Required Documentation. All other documents and
        legal matters in connection with the transactions contemplated by this
        Amendment shall have been delivered or executed or recorded and shall
        be in form and substance satisfactory to FINOVA.

                 (e)      Payment of Modification Fee.  FINOVA shall have
        received from Borrower a modification fee of Twelve Thousand Dollars
        ($12,000) for the processing and approval of this Amendment.

        7.       Representations and Warranties.  The Borrower represents and
warrants as follows:

                 (a)      Authority.  The Borrower has the requisite corporate
        power and authority to execute and deliver this Amendment, as
        applicable, and to perform its obligations hereunder and under the Loan
        Documents (as amended or modified hereby) to which it is a party.  The
        execution, delivery and performance by the Borrower of this Amendment,
        and the performance by each Loan Party of each Loan Document (as
        amended or modified hereby) to which it is a party have been duly
        approved by all necessary corporate action of such Loan Party and no
        other corporate proceedings on the part of such Loan Party are
        necessary to consummate such transactions.

                 (b)      Enforceability.  This Amendment has been duly
        executed and delivered by the Borrower.  This Amendment and each Loan
        Document (as amended or modified hereby) is the legal, valid and
        binding obligation of each Loan Party hereto or thereto, enforceable
        against such Loan Party in accordance with its terms, and is in full
        force and effect.

                 (c)      Representations and Warranties.  The representations
        and warranties contained in each Loan Document (other than any such
        representations or warranties that, by their terms, are specifically
        made as of a date other than the date hereof) are correct on and as of
        the date hereof as though made on and as of the date hereof.

                 (d)      No Default.  No event has occurred and is continuing
        that constitutes an Event of Default except as referenced in paragraph
        5 hereof.

        8.       Choice of Law.  The validity of this Amendment, its
construction, interpretation and enforcement, the rights of the parties
hereunder, shall be determined under, governed by, and construed in accordance
with the internal laws of the State of Arizona governing contracts only to be
performed in that State.





                                       5
<PAGE>   6




        9.       Counterparts.  This Amendment may be executed in any number of
counterparts and by different parties and separate counterparts, each of which
when so executed and delivered, shall be deemed an original, and all of which,
when taken together, shall constitute one and the same instrument.  Delivery of
an executed counterpart of a signature page to this Amendment by telefacsimile
shall be effective as delivery of a manually executed counterpart of this
Amendment.

        10.      Due Execution.  The execution, delivery and performance of
this Amendment are within the power of Borrower, have been duly authorized by
all necessary corporate action, have received all necessary governmental
approval, if any, and do not contravene any law or any contractual restrictions
binding on Borrower.

        11.      Reference to and Effect on the Loan Documents.

                 (a)      Upon and after the effectiveness of this Amendment,
        each reference in the Loan Agreement to "this Agreement", "hereunder",
        "hereof" or words of like import referring to the Loan Agreement, and
        each reference in the other Loan Documents to "the Loan Agreement",
        "thereof" or words of like import referring to the Loan Agreement,
        shall mean and be a reference to the Loan Agreement as modified and
        amended hereby.

                 (b)      Except as specifically amended above, the Loan
        Agreement and all other Loan Documents, are and shall continue to be in
        full force and effect and are hereby in all respects ratified and
        confirmed and shall constitute the legal, valid, binding and
        enforceable obligations of Borrower to FINOVA.

                 (c)      The execution, delivery and effectiveness of this
        Amendment shall not, except as expressly provided herein, operate as a
        waiver of any right, power or remedy of FINOVA under any of the Loan
        Documents, nor constitute a waiver of any provision of any of the Loan
        Documents.

                 (d)      To the extent that any terms and conditions in any of
        the Loan Documents shall contradict or be in conflict with any terms or
        conditions of the Loan Agreement, after giving effect to this
        Amendment, such terms and conditions are hereby deemed modified or
        amended accordingly to reflect the terms and conditions of the Loan
        Agreement as modified or amended hereby.

        12.      Ratification.  Borrower hereby restates, ratifies and
reaffirms each and every term and condition set forth in the Loan Agreement, as
amended hereby, and the Loan Documents effective as of the date hereof.

        13.      Estoppel.  To induce FINOVA to enter into this Amendment and
to continue to make advances to Borrower under the Loan Agreement, Borrower
hereby acknowledges and agrees that, after giving effect to this Amendment, as
of the date hereof, there exists no Event of Default except as referenced in
paragraph 5 hereof and no right of offset, defense, counterclaim or objection
in favor of Borrower as against FINOVA with respect to the Obligations.





                                       6
<PAGE>   7





        IN WITNESS WHEREOF, the parties have entered into this Amendment as of
the date first above written.

                                                   "BORROWER"

                                    SOUTH TEXAS DRILLING & EXPLORATION, INC.
                                    a Texas corporation



                                    By: /s/ Wm. Stacy Locke
                                       ----------------------------------------
                                    Title: President and CEO
                                          -------------------------------------


                                                   "FINOVA"

                                    FINOVA CAPITAL CORPORATION,
                                    a Delaware corporation




                                    By:  /s/ KENNETH SEPP
                                       ----------------------------------------
                                    Title:   Vice President                    
                                          -------------------------------------






                                       7

<TABLE> <S> <C>

<ARTICLE> 5
       
<S>                             <C>
<PERIOD-TYPE>                   YEAR
<FISCAL-YEAR-END>                          MAR-31-1998
<PERIOD-START>                             APR-01-1997
<PERIOD-END>                               MAR-31-1998
<CASH>                                       2,586,710
<SECURITIES>                                         0
<RECEIVABLES>                                1,546,599
<ALLOWANCES>                                   140,000
<INVENTORY>                                          0
<CURRENT-ASSETS>                             4,107,329
<PP&E>                                      16,968,191
<DEPRECIATION>                               8,573,771
<TOTAL-ASSETS>                              12,501,749
<CURRENT-LIABILITIES>                        2,988,422
<BONDS>                                              0
                                0
                                  3,799,994
<COMMON>                                       617,196
<OTHER-SE>                                   2,399,218
<TOTAL-LIABILITY-AND-EQUITY>                12,501,749
<SALES>                                        310,630
<TOTAL-REVENUES>                            17,090,601
<CGS>                                          175,983
<TOTAL-COSTS>                               15,969,265
<OTHER-EXPENSES>                               227,708
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                                   0
<INCOME-PRETAX>                                893,628
<INCOME-TAX>                                    62,688
<INCOME-CONTINUING>                                  0
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                   722,374
<EPS-PRIMARY>                                     0.13
<EPS-DILUTED>                                     0.11
        

</TABLE>


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