Page 6 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, 1998

                                    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 33-47668-02

         SOUTHWEST ROYALTIES INSTITUTIONAL 1992-93 INCOME PROGRAM
         Southwest Royalties Institutional Income Fund XI-B, L.P.
                  (Exact name of registrant as specified
                   in its limited partnership agreement)

Delaware                                          75-2427289
(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 15.



                      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, 1997 which are found in the Registrant's  Form
10-K  Report  for  1997 filed with the Securities and Exchange  Commission.
The December 31, 1997 balance sheet included herein has been taken from the
Registrant's  1997 Form 10-K Report.  Operating results for the  three  and
nine  month periods ended September 30, 1998 are not necessarily indicative
of the results that may be expected for the full year.



         Southwest Royalties Institutional Income Fund XI-B, L.P.
                                     
                              Balance Sheets

                                              September 30,   December 31,
                                                   1998           1997
                                              -------------   ------------
                                               (unaudited)
Assets

Current assets
 Cash and cash equivalents                     $    2,465          4,948
 Receivable from Managing General Partner               -         54,454
 Other receivable                                       -         51,887
                                                ---------      ---------
     Total current assets                           2,465        111,289
                                                ---------      ---------
Oil and gas properties - using the
 full cost method of accounting                 2,008,041      2,008,569
  Less accumulated depreciation,
   depletion and amortization                   1,334,567      1,217,154
                                                ---------      ---------
     Net oil and gas properties                   673,474        791,415
                                                ---------      ---------
Organization costs, net                             1,342          6,922
                                                ---------      ---------
                                               $  677,281        909,626
                                                =========      =========

Liabilities and Partners' Equity

Current liabilities
 Distribution payable                          $       83              6
 Payable to Managing General Partner                3,432              -
                                                ---------      ---------
     Total current liabilities                      3,515              6
                                                ---------      ---------

Partners' equity
 General partners                                     (8)         11,278
 Limited partners                                 673,774        898,342
                                                ---------      ---------
     Total partners' equity                       673,766        909,620
                                                ---------      ---------
                                               $  677,281        909,626
                                                =========      =========


         Southwest Royalties Institutional Income Fund XI-B, L.P.
                                     
                         Statements of Operations
                                (unaudited)


                                Three Months Ended    Nine Months Ended
                                  September 30,         September 30,
                                  1998      1997        1998      1997
                                  ----      ----        ----      ----

Revenues

Income from net profits
 interests                    $   18,319    32,409      34,365   141,732
Interest income from operations                 15          99       443
563
Miscellaneous income               9,937    12,425    (45,159)    32,331
                                  ------   -------     -------   -------
                                  28,271    44,933    (10,351)   174,626
                                  ------   -------     -------   -------
Expenses

General and administrative        13,192    10,832      44,010    38,938
Depreciation, depletion and
 amortization                     17,860    26,860      65,080    94,580
Provision for impairment of
 oil and gas properties                -         -      57,913         -
                                  ------   -------     -------   -------
                                  31,052    37,692     167,003   133,518
                                  ------   -------     -------   -------
Net income (loss)             $  (2,781)     7,241   (177,354)    41,108
                                  ======   =======     =======   =======



Net income (loss) allocated to:

 Managing General Partner     $    1,357     3,069     (4,892)    12,212
                                  ======   =======     =======   =======
 General Partner              $      151       341       (544)     1,357
                                  ======   =======     =======   =======
 Limited Partners             $  (4,289)     3,831   (171,918)    27,539
                                  ======   =======     =======   =======
  Per limited partner unit    $    (.88)       .79      (35.44)     5.68
                                  ======   =======     =======   =======



         Southwest Royalties Institutional Income Fund XI-B, L.P.
                                     
                         Statements of Cash Flows
                                (unaudited)


                                                      Nine Months Ended
                                                        September 30,
                                                       1998       1997
                                                       ----       ----
Cash flows from operating activities

 Cash received from oil and gas sales              $   73,885    213,588
 Cash paid to suppliers                              (18,916)   (38,938)
 Interest received                                        443        563
                                                      -------    -------
  Net cash provided by operating activities            55,412    175,213
                                                      -------    -------
Cash flows provided by investing activities

 Cash received from sale of oil and gas
  property interest                                     1,937          -
 Additions to oil and gas properties                  (1,409)          -
                                                      -------    -------
  Net cash provided by investing activities               528          -
                                                      -------    -------
Cash flows used in financing activities

 Distributions to partners                           (58,423)  (192,321)
                                                      -------    -------
Net decrease in cash and cash equivalents             (2,483)   (17,108)

 Beginning of period                                    4,948     20,225
                                                      -------    -------
 End of period                                     $    2,465      3,117
                                                      =======    =======

                                                             (continued)


         Southwest Royalties Institutional Income Fund XI-B, L.P.
                                     
                    Statements of Cash Flows, continued
                                (unaudited)


                                                      Nine Months Ended
                                                        September 30,
                                                       1998       1997
                                                       ----       ----
Reconciliation of net income (loss) to net
 cash provided by operating activities

Net income (loss)                                  $(177,354)     41,108

Adjustments to reconcile net income (loss) to
 net cash provided by operating activities

 Depreciation, depletion and amortization              65,080     94,580
 Provision for impairment of oil and gas properties               57,913
- -
 Decrease in receivables                               39,520     39,525
 Increase in payables                                  70,253          -
                                                      -------    -------
Net cash provided by operating activities          $   55,412    175,213
                                                      =======    =======




Item 2.  Management's  Discussion and Analysis of Financial  Condition  and
       Results of Operations
General
Southwest Royalties Institutional Income Fund XI-B, L.P. was organized as a
Delaware  limited  partnership on August 31, 1993.  The  offering  of  such
limited  partnership interests began October 25, 1993, as part of  a  shelf
offering registered under the name Southwest Royalties Institutional  1992-
93  Income Program.  Minimum capital requirements for the Partnership  were
met on December 8, 1993, with the offering of limited partnership interests
concluding  August  20, 1994, with total limited partner  contributions  of
$2,425,500.

The Partnership was formed to acquire royalty and net profits interests  in
producing  oil  and  gas properties, to produce and market  crude  oil  and
natural  gas  produced  from  such properties and  to  distribute  any  net
proceeds from operations to the general and limited partners.  Net revenues
from  producing  oil  and gas properties will not be  reinvested  in  other
revenue producing assets except to the extent that producing facilities and
wells are reworked or where methods are employed to improve or enable  more
efficient  recovery  of oil and gas reserves.  The  economic  life  of  the
Partnership will thus depend on the period over which the Partnership's oil
and gas reserves are economically recoverable.

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.

Based  on  current  conditions, management does not  anticipate  performing
workovers  during  the year.  The Partnership could possibly  experience  a
normal decline.

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.   For  the  quarter ended September  30,  1998,  the  net
capitalized cost did not exceed the estimated present value of oil and  gas
reserves.   A continuation of the oil price environment experienced  during
the  first  three  quarters  of 1998 will have an  adverse  affect  on  the
Company's revenues and operating cash flow.  Also, further declines in  oil
prices  could result in additional decreases in the carrying value  of  the
Company's oil and gas properties.


Results of Operations

A.  General Comparison of the Quarters Ended September 30, 1998 and 1997

The  following  table  provides certain information  regarding  performance
factors for the quarters ended September 30, 1998 and 1997:

                                                 Three Months
                                                    Ended        Percentage
                                                September 30,     Increase
                                                1998      1997   (Decrease)
                                                ----      ----   ----------
Average price per barrel of oil            $   11.59     17.12   (32%)
Average price per mcf of gas               $    1.91      1.85      3%
Oil production in barrels                      2,400     2,600    (8%)
Gas production in mcf                         24,000    26,900   (11%)
Income from net profits interests          $  18,319    32,409   (43%)
Partnership distributions                  $   1,000    30,600   (97%)
Limited partner distributions              $     900    27,450   (97%)
Per unit distribution to limited partners  $     .19      5.68   (97%)
Number of limited partner units                4,851     4,851

Revenues

The  Partnership's income from net profits interests decreased  to  $18,319
from   $32,409  for  the  quarters  ended  September  30,  1998  and  1997,
respectively,  a  decrease  of 43%.  The principal  factors  affecting  the
comparison  of  the  quarters ended September 30,  1998  and  1997  are  as
follows:

1.   The  average  price  for a barrel of oil received by  the  Partnership
     decreased  during the quarter ended September 30, 1998 as compared  to
     the  quarter  ended  September 30, 1997 by 32%, or $5.53  per  barrel,
     resulting  in a decrease of approximately $14,400 in income  from  net
     profits  interests.  Oil sales represented 38% of total  oil  and  gas
     sales  during the quarter ended September 30, 1998 as compared to  47%
     during the quarter ended September 30, 1997.

     The  average  price  for  an mcf of gas received  by  the  Partnership
     increased during the same period by 3%, or $.06 per mcf, resulting  in
     an  increase  of  approximately $1,600  in  income  from  net  profits
     interests.

     The net total decrease in income from net profits interests due to the
     change in prices received from oil and gas production is approximately
     $12,800.  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 200 barrels or 8%  during  the
   quarter  ended  September  30, 1998 as compared  to  the  quarter  ended
   September  30, 1997, resulting in a decrease of approximately $2,300  in
   income from net profits interests.

   Gas  production decreased approximately 2,900 mcf or 11% during the same
   period,  resulting in a decrease of approximately $5,500 in income  from
   net profits interests.

   The  total  decrease  in income from net profits interests  due  to  the
   change in production is approximately $7,800.

3.  Lease   operating  costs  and  production  taxes  were  5%  lower,   or
    approximately $3,400 less during the quarter ended September  30,  1998
    as compared to the quarter ended September 30, 1997.

Costs and Expenses

Total costs and expenses decreased to $31,052 from $37,692 for the quarters
ended  September 30, 1998 and 1997, respectively, a decrease of  18%.   The
decrease is the result of lower depletion expense, partially offset  by  an
increase in general and administrative expense.

1.  General and administrative costs consists of independent accounting and
    engineering  fees,  computer services, postage,  and  Managing  General
    Partner  personnel costs.  General and administrative  costs  increased
    22%  or  $2,400 during the quarter ended September 30, 1998 as compared
    to  the quarter ended September 30, 1997.  The increase in general  and
    administrative costs are due largely to higher accounting fees.  The 10-
    Q's   are   now  required  to  be  reviewed  based  on  new  accounting
    pronouncements.

2.  Depletion  expense decreased to $16,000 for the quarter ended September
    30,  1998 from $25,000 for the same period in 1997.  This represents  a
    decrease  of 36%.  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  decline in depletion expense between the  comparative
    periods were the decrease in the price of oil and the decline in  gross
    oil and gas revenues.



B.  General Comparison of the Nine Month Periods Ended September 30, 1998
and 1997

The  following  table  provides certain information  regarding  performance
factors for the nine month periods ended September 30, 1998 and 1997:

                                                 Nine Months
                                                    Ended        Percentage
                                                September 30,     Increase
                                                1998      1997   (Decrease)
                                                ----      ----   ---------
Average price per barrel of oil            $   12.02     19.79    (39%)
Average price per mcf of gas               $    1.71      2.08    (18%)
Oil production in barrels                      7,700     8,700    (11%)
Gas production in mcf                         65,600    80,900    (19%)
Income from net profits interests          $  34,365   141,732    (76%)
Partnership distributions                  $  58,500   192,600    (70%)
Limited partner distributions              $  52,650   173,340    (70%)
Per unit distribution to limited partners  $   10.85     35.73    (70%)
Number of limited partner units                4,851     4,851

Revenues

The  Partnership's income from net profits interests decreased  to  $34,365
from  $141,732  for  the nine months ended September  30,  1998  and  1997,
respectively,  a  decrease  of 76%.  The principal  factors  affecting  the
comparison  of  the nine months ended September 30, 1998 and  1997  are  as
follows:

1.  The  average  price  for a barrel of oil received  by  the  Partnership
    decreased  during the nine months ended September 30, 1998 as  compared
    to  the  nine  months ended September 30, 1997 by  39%,  or  $7.77  per
    barrel, resulting in a decrease of approximately $67,600 in income from
    net  profits interests.  Oil sales represented 45% of total oil and gas
    sales  during the nine months ended September 30, 1998 as  compared  to
    51% during the nine months ended September 30, 1997.

    The  average  price  for  an  mcf of gas received  by  the  Partnership
    decreased during the same period by 18%, or $.37 per mcf, resulting  in
    a  decrease  of  approximately  $30,000  in  income  from  net  profits
    interests.

    The  total  decrease in income from net profits interests  due  to  the
    change  in prices received from oil and gas production is approximately
    $97,600.   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 1,000 barrels or 11% during the
    nine  months  ended September 30, 1998 as compared to the  nine  months
    ended  September  30,  1997, resulting in a decrease  of  approximately
    $12,000 in income from net profits interests.

    Gas  production  decreased approximately 15,300 mcf or 19%  during  the
    same period, resulting in a decrease of approximately $26,200 in income
    from net profits interests.

    The  total  decrease in income from net profits interests  due  to  the
    change  in  production  is  approximately  $38,200.   The  decrease  is
    primarily attributable to the sharp natural decline on two leases and a
    gas explosion which caused a loss of two months of production.

3.  Lease  operating  costs  and  production  taxes  were  13%  lower,   or
    approximately  $25,500 less during the nine months ended September  30,
    1998 as compared to the nine months ended September 30, 1997.

Costs and Expenses

Total  costs and expenses increased to $167,003 from $133,518 for the  nine
months ended September 30, 1998 and 1997, respectively, an increase of 25%.
The  increase  is the result of higher general and administrative  expense,
partially offset by a decrease in depletion expense.

1.  General and administrative costs consists of independent accounting and
    engineering  fees,  computer services, postage,  and  Managing  General
    Partner  personnel costs.  General and administrative  costs  increased
    13%  or  $5,100  during  the nine months ended September  30,  1998  as
    compared to the nine months ended September 30, 1997.  The increase  in
    general  and administrative costs are due largely to higher  accounting
    fees.   The  10-Q's  are  now  required to be  reviewed  based  on  new
    accounting pronouncements.

2.  Depletion  expense  decreased to $59,500  for  the  nine  months  ended
    September  30,  1998 from $89,000 for the same period  in  1997.   This
    represents a decrease 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 decline in depletion expense  between  the
    comparative  periods  were the decrease in the price  of  oil  and  the
    decline in gross oil and gas revenues.

3. The  net capitalized costs for the nine months ended September 30,  1998
   exceeded   the  estimated  present  value  of  oil  and  gas   reserves,
   discounted  at  10%  in the amount of $57,913, such  excess  costs  were
   charged  to current expense.  The write-down had the effect of  reducing
   net income, but did not affect cash flow or partner distributions.



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 $55,400  in
the  nine  months  ended  September 30, 1998 as compared  to  approximately
$175,200  in the nine months ended September 30, 1997.  The primary  source
of the 1998 cash flow from operating activities was profitable operations.

Cash flows provided by investing activities were approximately $500 in  the
nine months ended September 30, 1998.  There were no cash flows provided by
investing activities in the nine months ended September 30, 1997.

Cash  flows used in financing activities were approximately $58,400 in  the
nine  months ended September 30, 1998 as compared to approximately $192,300
in  the  nine  months ended September 30, 1997.  The only use in  financing
activities was the distributions to partners.

Total  distributions during the nine months ended September 30,  1998  were
$58,500 of which $52,650 was distributed to the limited partners and $5,850
to  the  general  partners.  The per unit distribution to limited  partners
during  the  nine  months  ended September  30,  1998  was  $10.85.   Total
distributions during the nine months ended September 30, 1997 were $192,600
of  which  $173,340 was distributed to the limited partners and $19,260  to
the general partners.  The per unit distribution to limited partners during
the nine months ended September 30, 1997 was $35.73.

The  sources  for  the  1998  distributions of $58,500  were  oil  and  gas
operations  of  approximately  $55,400  and  the  change  in  oil  and  gas
properties of approximately $500, with the balance from available  cash  on
hand at the beginning of the period.  The source for the 1997 distributions
of  $192,600 was oil and gas operations of approximately $175,200, with the
balance from available cash on hand at the beginning of the period.

Since  inception of the Partnership, cumulative monthly cash  distributions
of  $989,439  have  been made to the partners.  As of September  30,  1998,
$904,353  or $186.43 per limited partner unit has been distributed  to  the
limited partners, representing a 37% return of the capital contributed.

As  of  September 30, 1998, the Partnership had approximately  $(1,050)  of
negative working capital.  The Managing General Partner knows of no unusual
contractual commitments and believes the revenues generated from operations
are adequate to meet the needs of the Partnership.





Information Systems for the Year 2000
The  Partnership  relies  on the Managing General Partner  for  their  data
processing  requirements.   This includes use of  a  program  designed  and
implemented  by Midland Southwest Software, the Managing General  Partner's
software subsidiary.  Midland Southwest Software currently has a year  2000
plan  in  effect.   They have surveyed existing programs and  hardware  and
estimate a compliance date of early 1999.  Determination of the total  cost
in connection with the year 2000 compliance issue is difficult to determine
due  to the fact that they are in the process of developing their new  1998
version  of  marketed  oil  and gas software, which  has,  from  inception,
included  year 2000 compliance.  Third party software programs utilized  by
the  Managing General Partner are either in compliance or are not  affected
by  the  year  2000,  with the exception of the payroll service,  which  is
currently modifying its system to accurately handle the Year 2000 issue.

The  Managing  General  Partner has not completed  its  evaluation  of  its
vendors  or  suppliers systems to determine the effect, if  any,  the  non-
compliance  of  such systems would have on the operations of  the  Managing
General  Partner.  Plans are under way to perform an audit in late 1998  or
early  1999  to determine the effect of non-compliance of its  vendors  and
suppliers  on the Managing General Partner and thus formulate a contingency
plan.

A  potential source of risk includes, but is not limited to, the  inability
of  principal  purchasers and suppliers to be year  2000  compliant,  which
could  have a material effect on the Managing General Partner's production,
cash  flow  and overall financial condition, notwithstanding  the  Managing
General  Partner's  actions to prepare its own  information  systems.   The
Managing  General  Partner currently does not have a  contingency  plan  in
place to cover any unforeseen problems encountered that relate to the  year
2000, but intends to produce one before the end of the fiscal year.




                        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)Exhibits:

             27 Financial Data Schedule

         (b) 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 Royalties Institutional Income
                                   Fund XI-B, 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 15, 1998