Page 14 of 14
                                 FORM 10-Q


                    SECURITIES AND EXCHANGE COMMISSION
                         WASHINGTON, D. C.  20549

(Mark One)

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

For the quarterly period ended September 30, 2001

                                    OR

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

For the transition period from _________________ to _______________

Commission file number 0-18996

                SOUTHWEST OIL & GAS 1990-91 INCOME PROGRAM
                Southwest Oil and Gas Income Fund X-A, L.P.
                  (Exact name of registrant as specified
                   in its limited partnership agreement)

Delaware                                          75-2310854
(State or other jurisdiction of                        (I.R.S. Employer
incorporation or organization)                         Identification No.)

                       407 N. Big Spring, Suite 300
                  _________Midland, Texas 79701_________
                 (Address of principal executive offices)

                      ________(915) 686-9927________
                      (Registrant's telephone number,
                           including area code)

Indicate  by  check  mark  whether registrant (1)  has  filed  all  reports
required to be filed by Section 13 or 15(d) of the Securities Exchange  Act
of 1934 during the preceding 12 months (or for such shorter period that the
registrant was required to file such reports), and (2) has been subject  to
such filing requirements for the past 90 days:

                            Yes __X__ No _____

         The total number of pages contained in this report is 14.



                      PART I. - FINANCIAL INFORMATION

Item 1.  Financial Statements

The  unaudited  condensed financial statements included  herein  have  been
prepared  by  the Registrant (herein also referred to as the "Partnership")
in  accordance  with generally accepted accounting principles  for  interim
financial information and with the instructions to Form 10-Q and Rule 10-01
of Regulation S-X.  Accordingly, they do not include all of the information
and  footnotes  required  by generally accepted accounting  principles  for
complete   financial  statements.   In  the  opinion  of  management,   all
adjustments necessary for a fair presentation have been included and are of
a  normal  recurring nature.  The financial statements should  be  read  in
conjunction with the audited financial statements and the note thereto  for
the  year ended December 31, 2000, which are found in the Registrant's Form
10-K  Report  for  2000 filed with the Securities and Exchange  Commission.
The December 31, 2000 balance sheet included herein has been taken from the
Registrant's  2000 Form 10-K Report.  Operating results for the  three  and
nine  month periods ended September 30, 2001 are not necessarily indicative
of the results that may be expected for the full year.



                Southwest Oil and Gas Income Fund X-A, L.P.

                              Balance Sheets

                                              September 30,   December 31,
                                                   2001           2000
                                              -------------   ------------
                                               (unaudited)
Assets
- ------
Current assets:
 Cash and cash equivalents                    $     21,317         16,448
 Receivable from Managing General Partner           20,726         58,391
                                                 ---------      ---------
    Total current assets                            42,043         74,839
                                                 ---------      ---------
Oil and gas properties - using the
 full-cost method of accounting                  3,813,488      3,796,887
  Less accumulated depreciation,
   depletion and amortization                    3,704,386      3,695,386
                                                 ---------      ---------
    Net oil and gas properties                     109,102        101,501
                                                 ---------      ---------
                                              $    151,145        176,340
                                                 =========      =========
Liabilities and Partners' Equity
- --------------------------------
Current liability - Distributions payable     $        336            677
                                                 ---------      ---------
Partners' equity:
 General partners                                 (17,047)       (15,461)
 Limited partners                                  167,856        191,124
                                                 ---------      ---------
    Total partners' equity                         150,809        175,663
                                                 ---------      ---------
                                              $    151,145        176,340
                                                 =========      =========


                Southwest Oil and Gas Income Fund X-A, L.P.

                         Statements of Operations
                                (unaudited)


                                Three Months Ended    Nine Months Ended
                                  September 30,         September 30,
                                  2001      2000        2001      2000
                                  ----      ----        ----      ----
Revenues
- --------
Oil and gas                  $    72,955   122,254     289,079   326,596
Interest                              19       104         236       107
                                 -------   -------     -------   -------
                                  72,974   122,358     289,315   326,703
                                 -------   -------     -------   -------
Expenses
- --------
Production                        59,365    62,274     182,125   168,654
General and administrative        20,993    20,804      63,044    62,892
Depreciation, depletion and
 amortization                      4,000     3,000       9,000     7,000
                                 -------   -------     -------   -------
                                  84,358    86,078     254,169   238,546
                                 -------   -------     -------   -------
Net income (loss)            $  (11,384)    36,280      35,146    88,157
                                 =======   =======     =======   =======



Net income (loss) allocated to:

 Managing General Partner    $     (665)     3,535       3,973     8,564
                                 =======   =======     =======   =======
 General Partner             $      (74)       393         441       952
                                 =======   =======     =======   =======
 Limited Partners            $  (10,645)    32,352      30,732    78,641
                                 =======   =======     =======   =======
  Per limited partner unit   $    (1.02)      3.09        2.93      7.50
                                 =======   =======     =======   =======



                Southwest Oil and Gas Income Fund X-A, L.P.

                         Statements of Cash Flows
                                (unaudited)


                                                      Nine Months Ended
                                                        September 30,
                                                       2001       2000
                                                       ----       ----
Cash flows from operating activities

 Cash received from oil and gas sales              $  322,144    294,444
 Cash paid to suppliers                             (240,569)  (249,994)
 Interest received                                        236        107
                                                      -------    -------
  Net cash provided by operating activities            81,811     44,557
                                                      -------    -------
Cash flows used in investing activities

 Additions to oil and gas properties                 (16,601)    (8,505)
                                                      -------    -------
Cash flows used in financing activities

 Distributions to partners                           (60,341)   (26,498)
                                                      -------    -------
Net increase in cash and cash equivalents               4,869      9,554

 Beginning of period                                   16,448      1,204
                                                      -------    -------
 End of period                                     $   21,317     10,758
                                                      =======    =======
Reconciliation of net income to net
 cash provided by operating activities

Net income                                         $   35,146     88,157

Adjustments to reconcile net income to
 net cash provided by operating activities

 Depreciation, depletion and amortization               9,000      7,000
 Decrease (increase) in receivables                    33,065   (32,152)
 Increase (decrease) in payables                        4,600   (18,448)
                                                    ---------     ------
Net cash provided by operating activities          $   81,811     44,557
                                                    =========     ======




                Southwest Oil & Gas Income Fund X-A, L.P.
                     (a Delaware limited partnership)

                      Notes to Financial Statements


1.   Organization
     Southwest  Oil and Gas Income Fund X-A, L.P. was organized  under  the
     laws of the state of Delaware on January 29, 1990, for the purpose  of
     acquiring  producing oil and gas properties and to produce and  market
     crude oil and natural gas produced from such properties for a term  of
     50  years, unless terminated at an earlier date as provided for in the
     Partnership  Agreement.   The  Partnership  sells  its  oil  and   gas
     production  to  a  variety of purchasers with the prices  it  receives
     being  dependent  upon the oil and gas economy.  Southwest  Royalties,
     Inc. serves as the Managing General Partner and H. H. Wommack, III, as
     the  individual  general partner.  Revenues, costs, and  expenses  are
     allocated as follows:

                                                     Limited      General
                                                     Partners     Partners
                                                     --------     --------

     Interest income on capital contributions        100%           -
     Oil and gas sales                                90%          10%
     All other revenues                               90%          10%
     Organization and offering costs (1)             100%           -
     Syndication costs                               100%           -
     Amortization of organization costs              100%           -
     Property acquisition costs                      100%           -
     Gain/loss on property disposition                90%          10%
     Operating and administrative costs (2)           90%          10%
     Depreciation, depletion and amortization
      of oil and as properties                       100%           -
     All other costs                                  90%          10%

          (1)   All  organization costs in excess of 3% of initial  capital
          contributions  will be paid by the Managing General  Partner  and
          will  be treated as a capital contribution.  The Partnership paid
          the  Managing  General Partner an amount equal to 3%  of  initial
          capital contributions for such organization costs.

          (2)   Administrative costs in any year which exceed 2% of capital
          contributions shall be paid by the Managing General  Partner  and
          will be treated as a capital contribution.

2.   Summary of Significant Accounting Policies
     The  interim financial information as of September 30, 2001,  and  for
     the  three  and  nine months ended September 30, 2001,  is  unaudited.
     Certain  information  and footnote disclosures  normally  included  in
     financial  statements prepared in accordance with  generally  accepted
     accounting principles have been condensed or omitted in this Form 10-Q
     pursuant  to the rules and regulations of the Securities and  Exchange
     Commission.   However,  in  the opinion of management,  these  interim
     financial  statements include all the necessary adjustments to  fairly
     present  the  results of the interim periods and all such  adjustments
     are  of a normal recurring nature.  The interim consolidated financial
     statements  should  be read in conjunction with the audited  financial
     statements for the year ended December 31, 2000.



Item 2.   Management's  Discussion and Analysis of Financial Condition  and
        Results of Operations

General
Southwest  Oil  &  Gas Income Fund X-A, L.P. was organized  as  a  Delaware
limited  partnership  on  January 29, 1990. The offering  of  such  limited
partnership  interests began on May 11, 1990 as part of  a  shelf  offering
registered  under  the  name Southwest Oil & Gas  1990-91  Income  Program.
Minimum  capital requirements for the Partnership were met  on  August  15,
1990,  with  the  offering of limited partnership interests  concluding  on
November 30, 1990, with total limited partner contributions of $5,242,000.

The  Partnership was formed to acquire interests in producing oil  and  gas
properties,  to produce and market crude oil and natural gas produced  from
such properties, and to distribute the net proceeds from operations to  the
limited  and  general partners.  Net revenues from producing  oil  and  gas
properties will not be reinvested in other revenue producing assets  except
to the extent that production facilities and wells are improved or reworked
or  where methods are employed to improve or enable more efficient recovery
of oil and gas reserves.

Increases   or   decreases   in  Partnership   revenues   and,   therefore,
distributions  to partners will depend primarily on changes in  the  prices
received  for  production,  changes in volumes of  production  sold,  lease
operating  expenses, enhanced recovery projects, offset drilling activities
pursuant  to farm-out arrangements, sales of properties, and the  depletion
of  wells.   Since  wells deplete over time, production  can  generally  be
expected to decline from year to year.

Well  operating costs and general and administrative costs usually decrease
with   production   declines;  however,  these  costs  may   not   decrease
proportionately.  Net income available for distribution to the partners  is
therefore expected to fluctuate in later years based on these factors.

Management does not anticipate performing workovers during the next  twelve
months.  The Partnership could possibly experience a normal decline  of  8%
to 10% per year.

Oil and Gas Properties
Oil  and  gas  properties  are accounted for at cost  under  the  full-cost
method.  Under this method, all productive and nonproductive costs incurred
in  connection with the acquisition, exploration and development of oil and
gas  reserves  are capitalized.  Gain or loss on the sale of  oil  and  gas
properties  is not recognized unless significant oil and gas  reserves  are
involved.

The  Partnership's policy for depreciation, depletion and  amortization  of
oil  and  gas  properties is computed under the units  of  revenue  method.
Under the units of revenue method, depreciation, depletion and amortization
is  computed  on  the  basis of current gross revenues from  production  in
relation  to future gross revenues, based on current prices, from estimated
production of proved oil and gas reserves.

Should the net capitalized costs exceed the estimated present value of  oil
and gas reserves, discounted at 10%, such excess costs would be charged  to
current  expense.  As of September 30, 2001, the net capitalized costs  did
not exceed the estimated present value of oil and gas reserves.



Results of Operations

A. General Comparison of the Quarters Ended September 30, 2001 and 2000

The  following  table  provides certain information  regarding  performance
factors for the quarters ended September 30, 2001 and 2000:

                                                 Three Months
                                                    Ended        Percentage
                                                September 30,     Increase
                                                2001      2000   (Decrease)
                                                ----      ----   ---------
Average price per barrel of oil            $   22.36     30.04    (26%)
Average price per mcf of gas               $    2.73      5.08    (46%)
Oil production in barrels                      3,100     3,500    (11%)
Gas production in mcf                          4,300     4,100       5%
Gross oil and gas revenue                  $  72,955   122,254    (40%)
Net oil and gas revenue                    $  13,590    59,980    (77%)
Partnership distributions                  $       -    26,284   (100%)
Limited partner distributions              $       -    26,284   (100%)
Per unit distribution to limited partners  $       -      2.51   (100%)
Number of limited partner units               10,484    10,484


Revenues

The  Partnership's oil and gas revenues decreased to $72,955 from  $122,254
for  the  quarters  ended  September 30, 2001  and  2000,  respectively,  a
decrease  of  40%.  The principal factors affecting the comparison  of  the
quarters ended September 30, 2001 and 2000 are as follows:

1.  The  average  price  for a barrel of oil received  by  the  Partnership
    decreased  during the quarter ended September 30, 2001 as  compared  to
    the  quarter  ended  September 30, 2000 by 26%, or  $7.68  per  barrel,
    resulting  in  a  decrease of approximately $23,800 in  revenues.   Oil
    sales  represented  86% of total oil and gas sales during  the  quarter
    ended  September 30, 2001 as compared to 83% during the  quarter  ended
    September 30, 2000.

    The  average  price  for  an  mcf of gas received  by  the  Partnership
    decreased during the same period by 46%, or $2.35 per mcf, resulting in
    a decrease of approximately $10,100 in revenues.

    The  total  decrease in revenues due to the change in  prices  received
    from oil and gas production is approximately $33,900.  The market price
    for  oil  and gas has been extremely volatile over the past decade  and
    management  expects a certain amount of volatility to continue  in  the
    foreseeable future.



2. Oil  production  decreased approximately 400 barrels or 11%  during  the
   quarter  ended  September  30, 2001 as compared  to  the  quarter  ended
   September 30, 2000, resulting in a decrease of approximately $12,000  in
   revenues.

    Gas  production increased approximately 200 mcf or 5% during  the  same
    period, resulting in an increase of approximately $1,000 in revenues.

    The  net total decrease in revenues due to the change in production  is
    approximately $11,000.

Costs and Expenses

Total costs and expenses decreased to $84,358 from $86,078 for the quarters
ended  September 30, 2001 and 2000, respectively, a decrease  of  2%.   The
decrease is the result of lower lease operating costs, partially offset  by
an increase in depletion expense and general and administrative expense.

1.    Lease  operating  costs  and  production  taxes  were  5%  lower,  or
   approximately $2,900 less during the quarter ended September 30, 2001 as
   compared to the quarter ended September 30, 2000.

2.  General and administrative costs consist of independent accounting  and
    engineering  fees,  computer services, postage,  and  Managing  General
    Partner personnel costs.  General and administrative costs increased 1%
    or  approximately $200 during the quarter ended September 30,  2001  as
    compared to the quarter ended September 30, 2000.

3.  Depletion  expense increased to $4,000 for the quarter ended  September
    30,  2001 from $3,000 for the same period in 2000.  This represents  an
    increase  of 33%.  Depletion is calculated using the units  of  revenue
    method  of  amortization based on a percentage of current period  gross
    revenues  to  total future gross oil and gas revenues, as estimated  by
    the   Partnership's  independent  petroleum  consultants   Contributing
    factors  to  the increase in depletion expense between the  comparative
    periods were the decrease in the price of oil and gas used to determine
    the Partnership's reserves for October 1, 2001 as compared to 2000, and
    the decrease in oil and gas revenues received by the Partnership during
    2001 as compared to 2000.






B.   General Comparison of the Nine Month Periods Ended September 30,  2001
and 2000

The  following  table  provides certain information  regarding  performance
factors for the nine month periods ended September 30, 2001 and 2000:

                                                 Nine Months
                                                    Ended        Percentage
                                                September 30,     Increase
                                                2001      2000   (Decrease)
                                                ----      ----   ---------
Average price per barrel of oil            $   23.44     27.93    (16%)
Average price per mcf of gas               $    4.60      3.90      18%
Oil production in barrels                      9,800    10,100     (3%)
Gas production in mcf                         12,900    11,400      13%
Gross oil and gas revenue                  $ 289,079   326,596    (11%)
Net oil and gas revenue                    $ 106,954   157,942    (32%)
Partnership distributions                  $  60,000    26,284     128%
Limited partner distributions              $  54,000    26,284     105%
Per unit distribution to limited partners  $    5.15      2.51     105%
Number of limited partner units               10,484    10,484

Revenues

The  Partnership's oil and gas revenues decreased to $289,079 from $326,596
for  the  nine  months ended September 30, 2001 and 2000,  respectively,  a
decrease  of  11%.  The principal factors affecting the comparison  of  the
nine months ended September 30, 2001 and 2000 are as follows:

1.  The  average  price  for a barrel of oil received  by  the  Partnership
    decreased  during the nine months ended September 30, 2001 as  compared
    to  the  nine  months ended September 30, 2000 by  16%,  or  $4.49  per
    barrel,  resulting in a decrease of approximately $44,000 in  revenues.
    Oil  sales represented 79% of total oil and gas sales during  the  nine
    months  ended  September 30, 2001 and 86% during the nine months  ended
    September 30, 2000.

    The  average  price  for  an  mcf of gas received  by  the  Partnership
    increased during the same period by 18%, or $.70 per mcf, resulting  in
    an increase of approximately $9,000 in revenues.

    The net total decrease in revenues due to the change in prices received
    from oil and gas production is approximately $35,000.  The market price
    for  oil  and gas has been extremely volatile over the past decade  and
    management  expects a certain amount of volatility to continue  in  the
    foreseeable future.



2.  Oil  production decreased approximately 300 barrels or  3%  during  the
    nine  months  ended September 30, 2001 as compared to the  nine  months
    ended  September  30,  2000, resulting in a decrease  of  approximately
    $8,400 in revenues.

    Gas production increased approximately 1,500 mcf or 13% during the same
    period, resulting in an increase of approximately $5,900 in revenues.

    The  net total decrease in revenues due to the change in production  is
    approximately $2,500.

Costs and Expenses

Total  costs and expenses increased to $254,169 from $238,546 for the  nine
months ended September 30, 2001 and 2000, respectively, an increase of  7%.
The  increase  is  the  result of higher lease operating  costs,  depletion
expense and general and administrative expense.

1.  Lease  operating  costs  and  production  taxes  were  8%  higher,   or
    approximately  $13,500 more during the nine months ended September  30,
    2001 as compared to the nine months ended September 30, 2000.

2.  General and administrative costs consist of independent accounting  and
    engineering  fees,  computer services, postage,  and  Managing  General
    Partner  personnel costs.  General and administrative  costs  increased
    less  than  1%  or  approximately $200 during  the  nine  months  ended
    September  30, 2001 as compared to the nine months ended September  30,
    2000.

3.  Depletion  expense  increased  to $9,000  for  the  nine  months  ended
    September  30,  2001  from $7,000 for the same period  in  2000.   This
    represents an increase of 29%.  Depletion is calculated using the units
    of  revenue  method  of amortization based on a percentage  of  current
    period  gross  revenues to total future gross oil and gas revenues,  as
    estimated  by  the  Partnership's  independent  petroleum  consultants.
    Contributing factors to the increase in depletion expense  between  the
    comparative periods were the decrease in the price of oil and gas  used
    to determine the Partnership's reserves for October 1, 2001 as compared
    to  2000,  and  the decrease in oil and gas revenues  received  by  the
    Partnership during 2001 as compared to 2000.



Liquidity and Capital Resources
The  primary source of cash is from operations, the receipt of income  from
interests in oil and gas properties.  The Partnership knows of no  material
change, nor does it anticipate any such change.

Cash  flows provided by operating activities were approximately $81,800  in
the  nine  months  ended  September 30, 2001 as compared  to  approximately
$44,600 in the nine months ended September 30, 2000.  The primary source of
the 2001 cash flow from operating activities was oil and gas operations.

Cash  flows used in investing activities were approximately $16,600 in  the
nine months ended September 30, 2001 as compared to approximately $8,500 in
the  nine  months ended September 30, 2000.  The principle use of the  2001
cash  flow  from  investing  activities was  the  change  in  oil  and  gas
properties.

Cash  flows used in financing activities were approximately $60,300 in  the
nine  months ended September 30, 2001 as compared to approximately  $26,500
provided  by in the nine months ended September 30, 2000. The only  use  in
financing activities was the distributions to partners.

Total  distributions during the nine months ended September 30,  2001  were
$60,000 of which $54,000 was distributed to the limited partners and $6,000
to  the  general  partners.  The per unit distribution to limited  partners
during  the  nine  months  ended  September  30,  2001  was  $5.15.   Total
distributions during the nine months ended September 30, 2000 were  $26,284
of  which  $26,284 was distributed to the limited partners.  The  per  unit
distribution to limited partners during the nine months ended September 30,
2000 was $2.51.

The source for the 2001 distributions of $60,000 was oil and gas operations
of  approximately $81,800, partially offset by the change in  oil  and  gas
properties  of  approximately  (16,600),  resulting  in  excess  cash   for
contingencies  or  subsequent  distributions.  The  source  for  the   2000
distributions  of  $26,284  was  oil and gas  operations  of  approximately
$44,600,  partially  offset  by the change in oil  and  gas  properties  of
approximately  $(8,500),  resulting in excess  cash  for  contingencies  or
subsequent distributions.

Since  inception of the Partnership, cumulative monthly cash  distributions
of  $2,827,732 have been made to the partners.  As of September  30,  2001,
$2,602,573 or $248.24 per limited partner unit has been distributed to  the
limited partners, representing a 50% return of the capital contributed.

As  of  September  30, 2001, the Partnership had approximately  $41,700  in
working  capital.   The  Managing  General  Partner  knows  of  no  unusual
contractual commitments.

Item 3.   Quantitative and Qualitative Disclosures About Market Risk

The Partnership is not a party to any derivative or
embedded derivative instruments.




                        PART II - OTHER INFORMATION


Item 1.  Legal Proceedings

         None

Item 2.  Changes in Securities

         None

Item 3.  Defaults Upon Senior Securities

         None

Item 4.  Submission of Matter to a Vote of Security Holders

         None

Item 5.  Other Information

         None

Item 6.  Exhibits and Reports on Form 8-K

         (a) No reports on Form 8-K were filed during the quarter for
             which this report is filed.




                                SIGNATURES


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

                                   Southwest Oil and Gas Income Fund X-A,
                                   L.P.
                                   a Delaware limited partnership

                                   By:  Southwest Royalties, Inc.
Managing General Partner


                                   By:  /s/ Bill E. Coggin
                                        ------------------------------
                                        Bill E. Coggin, Vice President
and Chief Financial Officer

Date:     November 14, 2001