Document:

<PAGE>   1
                                                                  EXHIBIT 10.13

                                  BILL OF SALE

         FOR GOOD CONSIDERATION, and in payment of the sum of $11550.00, IN A
NOTE OF EVEN DATES, the undersigned (Seller), hereby sells and transfers to
SIMPCO, INC., (Buyer), the following chattels and personal property: (Describe
property)

                                 SEE EXHIBIT "A"

         The Seller warrants it has good title to said property, full authority
to sell and transfer same, and that said property is sold free of all liens,
claims and encumbrances. Seller warrants it will defend and indemnify Buyer from
any adverse claims.

       Signed under seal this 1 day of FEB, 1999

                                                GRAY PRODUCTION TRUST

                                                By: /S/ C. Y. SMITH
                                                    ----------------------------
                                                         C. Y. SMITH TTE

                                                          Form 813
<PAGE>   2
<TABLE>
<CAPTION>

GRAY PRODUCTION TRUST 1 FEBRUARY 99                                  $17,100.00          $40,000.00                     $11,550.00
EQUIPMENT -- SOLD SIMPCO ON LONG TERM NOTE.

                                                                        TOTAL               TOTAL                          TOTAL
                                                             USED       USED       NEW       NEW       SOLD
                                                             UNIT       MKT.       UNIT      REP.      UNIT      QTY.      PRICE

<S>                                                          <C>        <C>        <C>      <C>        <C>       <C>       <C>
OLNEY 505 KNOX LOCATION JANUARY 1999

Mobil office building                                        1500       1500                5000       1000        1      1,000.00

Yankee yellow trailer                                                   3000                5000                          1,000.00

One 2 ton 1980 GMC winch truck, with Chevrolet C65 Cab       1500       1500       1500     1500                            500.00

8Nford tractor with brush hog and box                                   4500                4500                          3,000.00

1977 Chev Water truck with 40' 2" hoses and jagger pump                  500                1000                            500.00
and 1 1/2 FMC pump on bottom                                             100                1500                             50.00

1963 Intl 1600 two ton winch truck with blocks and
good line, and new winch                                                                                                    500.00
With cups of 4 1/2 swab cups                                            1000                1500

1977 (or so) GMC pulling machine - fully tooled
with 1400' sand line                                                    5000               20000                          5,000.00
All tools in barn
Tubing swab & casing swab laying on base of Cyclone unit

BALANCE DUE GRAY PRODUCTION TRUST                                    $17,100.00          $40,000.00                     $11,550.00
</TABLE><PAGE>   1
                                                                   EXHIBIT 10.14

                                  BALLOON NOTE

         FOR VALUE RECEIVED, the undersigned promise to pay to the order of GRAY
PRODUCTION TRUST, the sum of ELEVEN THOUSAND FIVE HUNDRED FIFTY ($11550.00),
Dollars, with annual interest of 8% on any unpaid balance.

         This note shall be paid in 1 installment of $11550.00 each with a first
payment three years from date hereof, provided the entire principal balance and
any accrued but unpaid interest shall be fully paid on or before 1 Feb, 2002.
This note may be prepaid without penalty. All payments shall be first applied to
earned interest and the balance to principal.

         This note shall be due and payable upon demand of any holder hereof
should any payment due hereunder not be made within 10 days of its due date. All
parties to this note waive presentment, demand and protest, and all notices
thereto. In the event of default, the undersigned agree to pay all costs of
collection and reasonable attorneys' fees to the extent permitted by law. The
undersigned shall be jointly and severally liable under this note.

         Signed under seal this 1 day of FEB. 1999.

In the presence of:                                        SIMPCO, INC.

   /s/ Richard C. Smith                                    by /s/ B. Walker
   -----------------------                                    ------------------
                                                           Maker  PRESIDENT

                      SECURITY FOR NOTE IS EQUIPMENT LISTED
                             ON ATTACHED EXHIBIT "A"

                                                                  Form 207A
                                                                  Update #3.1989
<PAGE>   2
<TABLE>
<CAPTION>

GRAY PRODUCTION TRUST 1 FEBRUARY 99                                  $17,100.00          $40,000.00                     $11,550.00
EQUIPMENT -- SOLD SIMPCO ON LONG TERM NOTE.

                                                                        TOTAL               TOTAL                          TOTAL
                                                             USED       USED       NEW       NEW       SOLD
                                                             UNIT       MKT.       UNIT      REP.      UNIT      QTY.      PRICE

<S>                                                          <C>        <C>        <C>      <C>        <C>       <C>       <C>
OLNEY 505 KNOX LOCATION JANUARY 1999

Mobil office building                                        1500       1500                5000       1000        1      1,000.00

Yankee yellow trailer                                                   3000                5000                          1,000.00

One 2 ton 1980 GMC winch truck, with Chevrolet C65 Cab       1500       1500       1500     1500                            500.00

8Nford tractor with brush hog and box                                   4500                4500                          3,000.00

1977 Chev Water truck with 40' 2" hoses and jagger pump                  500                1000                            500.00
and 1 1/2 FMC pump on bottom                                             100                1500                             50.00

1963 Intl 1600 two ton winch truck with blocks and
good line, and new winch                                                                                                    500.00
With cups of 4 1/2 swab cups                                            1000                1500

1977 (or so) GMC pulling machine - fully tooled
with 1400' sand line                                                    5000               20000                          5,000.00
All tools in barn
Tubing swab & casing swab laying on base of Cyclone unit

BALANCE DUE GRAY PRODUCTION TRUST                                    $17,100.00          $40,000.00                     $11,550.00
</TABLE><PAGE>   1
                                                                   EXHIBIT 10.15

                                  BILL OF SALE

     FOR GOOD CONSIDERATION, and in payment of the sum of $ 10.00 and other good
and valuable considerations, the undersigned (Seller), hereby sells and
transfers to BASIC TECHNOLOGIES, INC., (Buyer), OR ASSIGNS, the following
chattels and personal property: (Describe property)

     SEE LIST OF EQUIPMENT ON EXHIBIT "A"
     ATTACHED (SIX PAGES).

     The Seller warrants it has good title to said property, full authority to
sell and transfer same, and that said property is sold free of all liens, claims
and encumbrances. Seller warrants it will defend and indemnify Buyer from any
adverse claims.

Dated:  2/7/99

                                              /s/ ERIC SIMPSON
                                           -------------------------------------
                                           ERIC FRANKLIN SIMPSON, AS THE AUTH
In the presence of:                        OFFICER OF SIMPCO, INC. AND AS EM-
                                           POWERED POWER OF ATTORNEY OF
                                           ALL STOCKHOLDERS OF SIMPCO, INC.,
                                           INDIVIDUALLY; AND IN ANY / OR
  /s/ B WALKER                             ALL CAPACITIES IN ANY WAY OR
----------------------------               MANNER RELATING TO SIMPCO, INC.,
BRYAN LEE WALKER                           OR THE INDIVIDUALS INVOLVED.

IN TRUCK - BUT DID NOT SIGN

----------------------------
EDDIE GOBER
                         BW
                       2/7/99

<PAGE>   2
                                                                           P. 02

               ATTACHMENT TO BASIC / SIMPCO ACQUISITION AGREEMENT

                                 EQUIPMENT LIST

<TABLE>
<S>                                                                     <C>
Sub base 4 x 16 x 1                                                     2,500.00
4 1/2 5 1/2 7" packer (2 each)                                          5,000.00
1 lot pipe wrenches 2-24" 2-36" 1-18" 1-48" 1-60"                         850.00
1 lot misc. hand tools                                                    500.00
1 weight bar                                                              250.00
1 hydraulic sub saver                                                   1,200.00
4 1/2 - 5 1/2 - 8 5/8 cementing hoods                                   7,500.00
1 set 20 bbl disposal tanks                                               750.00
Misc. drill bits                                                        2,500.00
Misc. drilling subs & change overs                                      5,000.00
3 float shoes                                                           3,000.00
600' 2 7/8 drill pipe smooth joints                                     6,000.00
1500' 3 1/2 drill pipe                                                  7,500.00
6 - 4 1/2 drill collars                                                 6,000.00
4 - 3 1/2 drill collars                                                 4,000.00
1 - stripping head  4 1/2                                               2,500.00
1 lot pipe wrenches 2 - 24" 1-36" 1-18" 1-48" 1-60"                       750.00
1 lot shop hand tools                                                   2,500.00
1 metal bench with vice                                                   750.00
1 hydraulic press                                                       1,500.00
1 welding bench                                                           750.00
1 4 1/2" over shot                                                      1,500.00
1 lot chains & boomers                                                    750.00
</TABLE>

<PAGE>   3

                                                                           P. 03

               ATTACHMENT TO BASIC / SIMPCO ACQUISITION AGREEMENT

                                 EQUIPMENT LIST

<TABLE>
<S>                                                                   <C>
Skid for pump with 500 gl. diesel tank                                   1,500.00
Skid mounted dog house                                                   1,500.00
Metal drilling pits                                                      4,500.00
Skid mounted spool - N.C.                                                1,500.00
Skid mounted pump 5 x 10 Gaso - 3-71 diesel                             14,500.00
2 5 x 10 Gaso pumps                                                     12,000.00
1 extra 5 x 10 Gaso fluid end                                            3,000.00
4 x 6 Gaso pump - electric motor skit mounted                            6,500.00
4 x 6 Oilwell pump                                                       2,500.00
J. D. 35 KW Generator & Lincoln Welder                                  12,500.00
260 Amp Shop welder electric                                             2,500.00
200 gal. Skid mounted diesel tank                                          750.00
500 gal. Diesel overhead storage tank                                      750.00
Electric chop saw                                                          250.00
3 sets cutting torches                                                   1,000.00
Skid mounted 3 x 4 centrifugal pump - 3-71 Detroit power                 6,000.00
1 extra 13 speed......truck                                              1,500.00
Extra 290 Cummins Big......truck                                         5,000.00
Extra 8V71 Comp. for parts or rebuild                                    1,500.00
6V71 parts only                                                            500.00
1 pipe tester & pipe straightener (motor & pump)                        18,500.00
1 - 150 bbl. Skid mounted water tank                                     1,500.00
8 x 8 x 32' mixing & water storage pit                                   3,500.00
Cement bond tool (wire line)                                             6,500.00
</TABLE>

<PAGE>   4

                                                                           P. 04

               ATTACHMENT TO BASIC / SIMPCO ACQUISITION AGREEMENT

                                 EQUIPMENT LIST

<TABLE>
<S>                                                                        <C>
54 - 93 Foster Tongs 2 3/8 - 7"                                                 18,500.00
                                                                             ------------
8 5/8 Casing Tongs                                                              17,500.00
Pec -O Matic Tongs 2 3/8 - 5 1/2                                                12,500.00
Small set of Foster Tongs                                                        7,500.00
2 sets of Air Guiberson deep well slips                                          9,000.00
                                                                             ------------
1 set BJ Air deep well slips                                                     3,500.00
1 set OTCO 4 1/2 slips                                                           2,500.00
3 sets rod elevator                                                              4,500.00
3 sets rod wrenches                                                              2,150.00
1 set T 110 slips 4 1/2 & 5 1/2 inserts                                          6,500.00
Drag rings & inserts (2 3/8, 2 7/8, 3 1/2, 4 1/2, 5 1/2, 7) for FosterTongs     12,500.00
1 set Pennant 260 pad weight ind.                                                4,500.00
1 set Pennant 140 pad weight ind.                                                3,500.00
Line scale 260,000                                                               2,500.00
Line scale 400,000                                                               4,500.00
2 Bridge plug setting tools (wire line)                                          8,000.00
3 - May collar locators (wire line)                                              4,500.00
1 - 3 1/2" magnet (wire line)                                                    1,200.00
Misc. sub & connections (wire line)                                              8,000.00
2 set Foster back-up for tongs                                                   4,000.00
1 set manual make-up & breakout tongs                                            7,500.00
2 hyd. B. O. P.                                                                  7,000.00
Bowen S-45 power swivel                                                         18,000.00
1 set B.J. Rig back-up                                                           1,500.00
2 3/8 - 2 2 7/8- 2 4 1/2 - 2 5 1/2 - 2 7" 2 elevators                           10,000.00
8 5/8 - 9 5/8 - 10 3/4 elevator 1 each                                           5,000.00
7" - 8 5/8 - 9 5/8 - 10 3/4 slips & bowls                                        7,500.00
</TABLE>

<PAGE>   5

                                                                           P. 05

               ATTACHMENT TO BASIC / SIMPCO ACQUISITION AGREEMENT

                                 EQUIPMENT LIST

<TABLE>
<S>                                                <C>
Pump & Cement mixing trailer (2 pumps)                 57,500.00
                                                    ------------
30 Ton Loadcraft Trailer drop deck                     14,500.00
Cement bulk trailer 800 sack double tear               15,500.00
Cement bulk storage Trailer 1200 + sack                16,500.00
Dozer trailer single tandem                             6,500.00
Trailer 35" float                                       5,500.00
Blue pipe trailer single tandem                         5,500.00
40 bbl. Water trailer single dual                       4,500.00
200 bbl. Water storage trailer                          8,500.00
180 bbl. Water Trailer                                 16,500.00
2 axle drill pipe trailer 800" pipe 5 collars          19,500.00
Single axle metal dog house trailer                     5,500.00
Blue pit tr. 3 axle (cement mixing)                     5,500.00
Portable pump trailer 10 x 5 Wheatly pump               7,500.00
Eqp. Trailer (low boy) Tandem duals                    16,500.00
30" dual Tandem tr. Vac/hyd brakes rolling tail         6,500.00
B.J. hyd. Power unit trailer mounted                    7,500.00
Steel flat bed tr. 2 axle                               1,500.00
Slick line wire trailer (shooting rig)                  3,500.00
Set of casing jack - with hyd. power unit              25,000.00
35" sq. kelly & swivel                                  2,500.00
32" brown pipe tr. tandem                               4,500.00
</TABLE>

<PAGE>   6

                                                                           P. 06

               ATTACHMENT TO BASIC / SIMPCO ACQUISITION AGREEMENT

                                 EQUIPMENT LIST

<TABLE>
<S>                                                       <C>
Rig double triple 658 draw works                          145,000.00
                                                        ------------
Rig super 38 Wilson 66" derrick                            75,000.00
Rig Sanderson (Drill & workover comb.)                     55,000.00
1975 Fort 4 T water truck & pump                           16,000.00
                                                        ------------
Mack Truck (350 Cummins)                                   16,500.00
White Truck (290 Cummins)                                  14,500.00
1972 Ford 3 1/2 T (150 sack cement hopper & blower)        18,500.00
                                                        ------------
Int. Truck 4 T (200 sack cement hopper & blower)           14,000.00
1980 Int. Truck with 6V92                                   7,500.00
White Chev. winch truck (diesel)                           12,000.00
Green Chev. winch truck                                     8,500.00
Mack 50 bbl. water  truck                                  16,000.00
D5 Cat dozer                                               35,000.00
450 Case Dozer                                             27,500.00
                                                        ------------
1986 Ford 3/4 T P.U. diesel supercab                        5,500.00
1993 Ford 3/4 T P.U. 7.3 turbo diesel supercab             17,500.00
1989 Ford 3/4 T P.U. gas supercab                           8,500.00
                                                        ------------
1975 Chev. Wireline Truck                                  22,500.00
                                                        ------------
Int. Kill Truck 40bbl tank triplex pump bowie pump         45,000.00
Int. pipe testing truck (2 pumps)                           7,500.00
Champ fork lift                                            18,500.00
</TABLE>

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