SOUTHWEST ROYALTIES INSTITUTIONAL INCOME FUND X-B LP
8-K/A, 1998-12-09
CRUDE PETROLEUM & NATURAL GAS
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               SECURITIES AND EXCHANGE COMMISSION

                     Washington, D.C. 20549

                           FORM 8-K/A

                         CURRENT REPORT


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

               Date of Report September 29, 1998


    Southwest Royalties Institutional Income Fund X-B, L.P.
           (Exact name of registrant as specified in
               its limited partnership agreement)



Delaware                                                  0-19601
                              75-2332174
(State   or  other  jurisdiction        Commission            IRS
Employer
of        incorporation)                        File       Number
Identification No.



       407 N. Big Spring, Suite 300, Midland, Texas 79701
       (Address of principal executive office) (Zip Code)


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


                              None
 (Former name or former address, if changed since last report.)




The total number of pages contained in this report is 9.


<PAGE>
Item 2.   Acquisition or Disposition of Assets

          (a)    On   September  29,  1998,  Southwest  Royalties
          Institutional  Income Fund X-B (the "Registrant")  sold
          its  interest  in  one  oil property  to  Marathon  Oil
          Company   ("Marathon"),  an   unrelated   party.    The
          Registrant's  interest in the well  was  sold  for  net
          proceeds,  after post closing adjustments, of $167,650.
          At  December  31, 1997, the property sold  to  Marathon
          contained proved reserves of 75,310 barrels of oil  and
          had  a SEC 10 value of $190,956.  The proceeds from the
          sale represented 14% of the Registrant's total assets.

Item 7.   Financial Statements and Exhibits

     (b)  Pro Forma Financial Information
          
          The   accompanying   unaudited  pro   forma   financial
          information of the Registrant is presented  to  reflect
          the sale of an oil property on September 29, 1998.  The
          unaudited  pro forma balance sheet is presented  as  if
          the  sale  of the oil property occurred at the  balance
          sheet  date  and the unaudited pro forma statements  of
          operations are presented as if the sale of the property
          occurred on January 1, 1997.
          
     (c)  Exhibits
          
          None


<PAGE>
            Unaudited Pro Forma Financial Statements
                                
      The  Unaudited  Pro  Forma Financial Statements  have  been
prepared  to  give  effect to the sale  of  an  oil  property  on
September 29, 1998.  The Unaudited Pro Forma Financial Statements
of the Registrant are not necessarily indicative of the financial
results  for  the periods presented had the sale of the  property
taken place on January 1, 1997.  In addition, future results  may
vary significantly from the results reflected in the accompanying
Unaudited  Pro  Forma  Financial  Statements  because  of  normal
production  declines and changes in product prices,  among  other
factors.  This information should be read in conjunction with the
Financial  Statements of the Registrant (and the  related  notes)
included  in  the Annual Report on Form 10-K for the  year  ended
December  31, 1997 and in the Quarterly Report on Form  10-Q  for
the six months ended June 30, 1998.


<PAGE>
     Southwest Royalties Institutional Income Fund X-B, L.P.
                                
                Unaudited Pro Forma Balance Sheet
                       As of June 30, 1998
                                
                                           Pro Forma
                                Historical  Entries  Pro Forma
                               ----------- --------------------

Assets

Current assets
 Cash and cash equivalents     $  38,211 $167,650 (a)$205,861
                               ---------            ---------
Oil and gas properties - using the
 full cost method of accounting         4,183,062 (167,650)(a)
4,015,412
  Less accumulated depreciation,
   depletion and amortization  3,002,196            3,002,196
                               ---------            ---------
     Net oil and gas properties          1,180,866
1,013,216
                               ---------            ---------
                               $1,219,077           $1,219,077
                               =========            =========

Liabilities and Partners' Equity

Current liability
 Distribution payable          $      51            $      51
 Payable to Managing General Partner        27,198
27,198
                               ---------            ---------
     Total current liabilities    27,249               27,249
                               ---------            ---------
Partners' equity
 General partners               (31,756)             (31,756)
 Limited partners              1,223,584            1,223,584
                               ---------            ---------
     Total partners' equity    1,191,828            1,191,828
                               ---------            ---------
                               $1,219,077           $1,219,077
                               =========            =========












     See accompanying notes to unaudited pro forma financial
                           statements.

<PAGE>
     Southwest Royalties Institutional Income Fund X-B, L.P.
                                
           Unaudited Pro Forma Statement of Operations
                 Six months ended June 30, 1998
                                
                                             Assets
                                Historical    Sold   Pro Forma
                               ----------- --------------------

Revenues

Income  from  net profits interests      $  21,206   $   3,946(b)
$ 25,152
Interest                             894       -          894
                                 -------  ------      -------
                                  22,100   3,945       26,046
                                 -------  ------      -------

Expenses

General and administrative        49,430       -       49,430
Depreciation, depletion and
 Amortization                     98,000  (9,900) (c)  88,100
Provision for impairment of oil
 and gas properties               51,105       -       51,105
                                 -------  ------      -------
                                 198,535  (9,900)     188,635
                                 -------  ------      -------
Net loss                       $(176,435) $13,846    $(162,589)
                                 =======  ======      =======

Net loss allocated to:

 Managing General Partner      $ (2,460)             $(2,105)
                                 =======              =======
 General Partner               $   (273)             $  (233)
                                 =======              =======
 Limited Partners              $(173,702)            $(160,251)
                                 =======              =======
  Per limited partner unit     $  (15.54)            $ (14.33)
                                 =======              =======

















     See accompanying notes to unaudited pro forma financial
                           statements

<PAGE>
     Southwest Royalties Institutional Income Fund X-B, L.P.
                                
           Unaudited Pro Forma Statement of Operations
              For the year ended December 31, 1997
                                
                                             Assets
                                Historical    Sold   Pro Forma
                               ----------- --------------------

Revenues

Income  from  net profits interests      $  530,113  $   (77,466)
(b)  $                         452,647
Interest                           4,876        -       4,876
                                 -------  -------     -------
                                         534,989         (77,466)
457,523
                                 -------  -------     -------

Expenses

General and administrative        80,881        -      80,881
Depreciation, depletion and
  Amortization                     198,000   (31,700)         (c)
166,300
                                 -------  -------     -------
                                         278,881         (31,700)
247,181
                                 -------  -------     -------
Net  income                      $ 256,108   $(45,766)          $
210,342
                                 =======  =======     =======

Net income allocated to:

 Managing General Partner      $  40,870             $ 33,898
                                 =======              =======
 General Partner               $   4,541             $  3,766
                                 =======              =======
 Limited Partners              $ 210,697             $172,678
                                 =======              =======
  Per limited partner unit     $   18.84             $  15.44
                                 =======              =======

















     See accompanying notes to unaudited pro forma financial
                           statements

<PAGE>

     Southwest Royalties Institutional Income Fund X-B, L.P.

        Notes to Unaudited Pro Forma Financial Statements
               December 31, 1997 and June 30, 1998

Note 1: Basis of Presentation

      The  accompanying unaudited pro forma financial information
of  Southwest Royalties Institutional Income Fund X-B, L.P.  (the
"Registrant") is presented to reflect the sale of an oil property
to Marathon Oil Company on September 29, 1998 (the "Asset Sold").
The  unaudited  pro forma balance sheet is presented  as  if  the
Asset  Sold occurred at June 30, 1998 and the unaudited pro forma
statements  of  operations are presented as if the  sale  of  the
Asset Sold occurred on January 1, 1997.

     Historical - Represents the Registrant's balance sheet as of
     June  30, 1998 and the Registrant's statements of operations
     for  the  six months ended June 30, 1998 and the year  ended
     December 31, 1997.

     Asset Sold - Reflects the results of operations for the  six
     months  ended June 30, 1998 and the year ended December  31,
     1997 from the oil property prior to the sale in 1998.

Note 2: Pro Forma Entries

     (a) To  record  the sale of the Asset Sold as if  such  sale
         had  occurred  on  June 30, 1998.   The  aggregate  cash
         proceeds   of   $167,650  were  initially  utilized   to
         increase   cash  and  cash  equivalents  and   will   be
         partially distributed to the partners.

     (b)  Reflects gross oil sales net of lease operating cost and
         production taxes for the Asset Sold for the periods represented.
     
         (c)Depletion for the periods represented was  calculated
         for  the  Asset Sold under the units of revenue  method.
         Under   the  units  of  revenue  method,  depletion   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.

Note 3: Oil and Gas Information

      The  following unaudited pro forma supplemental information
regarding  the  oil  activities of the  Registrant  is  presented
pursuant  to  the  disclosure  requirements  promulgated  by  the
Securities  and  Exchange Commission and Statement  of  Financial
Accounting  Standard  No.  69, "Disclosures  About  Oil  and  Gas
Producing   Activities".    The  pro   forma   combined   reserve
information  is  presented as if the sale of the Asset  Sold  had
occurred on January 1, 1997.  Information for oil is presented in
barrels (bbls).

       The  Registrant  emphasizes  that  reserve  estimates  are
inherently  imprecise and subject to revision.  Accordingly,  the
estimates  are  expected to change as future information  becomes
available.





<PAGE>

     Southwest Royalties Institutional Income Fund X-B, L.P.

        Notes to Unaudited Pro Forma Financial Statements
               December 31, 1997 and June 30, 1998

Note 3: Oil and Gas Information - continued

     Set forth below is a pro forma summary of the changes in the
net  quantities of oil reserves for the year ended  December  31,
1997.

                                                  Oil (bbls)
                                                  ----------
     Net proved reserves at January 1, 1997        642,000
             Revisions        of        previous        estimates
(270,000)
     Production                                   (43,000)
     Sale of minerals in place                     (5,000)
                                                   -------
     Net proved reserves at December 31, 1997      324,000
                                                   =======
     The pro forma estimated present value of future net revenues
of  proved reserves, calculated using December 31, 1997 prices of
$16.88  per  barrel of oil, discounted at 10%, was  approximately
$1,801,861 at December 31, 1997.


<PAGE>
                           SIGNATURES


Pursuant  to  the  requirements of Section 13  or  15(d)  of  the
Securities Exchange Act of 1934, the Partnership has duly  caused
this  report  to  be  signed on its behalf  by  the  undersigned,
thereunto duly authorized.

                                                        Southwest
                              Royalties Institutional Income Fund
                              X-B, L.P.



                                                              By:
                                   Southwest Royalties, Inc.
                                   Managing General Partner

                                                              By:
                                   /s/ Bill E. Coggin

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

Bill E. Coggin
                                   Vice President


Pursuant  to the requirements of the Securities Exchange  Act  of
1934,  this report has been signed below by the following  person
on  behalf of the Partnership and in the capacity and on the date
indicated.


Date: December 9, 1998             /s/ Bill E. Coggin
                              ----------------------------------
                              Bill E. Coggin, Vice President and
                              Chief Financial Officer



<PAGE>



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