<PAGE>

                                    FORM 10-Q


                       SECURITIES AND EXCHANGE COMMISSION

                             Washington, D.C. 20549


    [ 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: 0-20154


                   SWIFT ENERGY PENSION PARTNERS 1991-C, LTD.
             (Exact name of registrant as specified in its charter)

<TABLE>
<S>                                           <C>       
                  Texas                                      76-0350269
(State or other jurisdiction of organization) (I.R.S. Employer Identification No.)
</TABLE>


                        16825 Northchase Drive, Suite 400
                              Houston, Texas 77060
                    (Address of principal executive offices)
                                   (Zip Code)

                                  (281)874-2700
              (Registrant's telephone number, including area code)

                                      None
              (Former name, former address and former fiscal year,
                          if changed since last report)


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



<PAGE>


                   SWIFT ENERGY PENSION PARTNERS 1991-C, LTD.

                                      INDEX



<TABLE>
<CAPTION>
PART I.    FINANCIAL INFORMATION                                                              PAGE
      <S>                                                                                      <C>
      ITEM 1.    Financial Statements

            Balance Sheets

                - September 30, 1998 and December 31, 1997                                      3

            Statements of Operations

                - Three month and nine month periods ended September 30, 1998 and 1997          4

            Statements of Cash Flows

                - Nine month periods ended September 30, 1998 and 1997                          5

            Notes to Financial Statements                                                       6

      ITEM 2.    Management's Discussion and Analysis of Financial
                     Condition and Results of Operations                                        9

PART II.    OTHER INFORMATION                                                                  11


SIGNATURES                                                                                     12
</TABLE>




<PAGE>


                   SWIFT ENERGY PENSION PARTNERS 1991-C, LTD.
                                 BALANCE SHEETS



<TABLE>
<CAPTION>
                                                                                         September 30,        December 31,
                                                                                             1998                 1997
                                                                                       ---------------     ----------------
                                                                                         (Unaudited)
         <S>                                                                           <C>                  <C>            
         ASSETS:

         Current Assets:
              Cash and cash equivalents                                                $        1,635       $        1,585 
              Nonoperating interests income receivable                                         17,231               78,390 
                                                                                       ---------------     ----------------
                  Total Current Assets                                                         18,866               79,975 
                                                                                       ---------------     ----------------
         Nonoperating interests in oil and gas
              properties, using full cost accounting                                        4,155,611            4,204,224 
         Less-Accumulated amortization                                                     (3,278,775)          (2,905,178)
                                                                                       ---------------     ----------------
                                                                                              876,836            1,299,046 
                                                                                       ---------------     ----------------
                                                                                       $      895,702       $    1,379,021 
                                                                                       ===============     ================


         LIABILITIES AND PARTNERS' CAPITAL:

         Current Liabilities:
              Accounts Payable                                                         $        7,996       $        5,747 
                                                                                       ---------------     ----------------

         Interest Holders' Capital (3,664,333 Interest Holders' SDIs;
                                   $1.00 per SDI)                                             852,559            1,322,883 
         General Partners' Capital                                                             35,147               50,391 
                                                                                       ---------------     ----------------
                  Total Partners' Capital                                                     887,706            1,373,274 
                                                                                       ---------------     ----------------
                                                                                       $      895,702       $    1,379,021 
                                                                                       ===============     ================
</TABLE>


                 See accompanying notes to financial statements.

                                        3


<PAGE>


                   SWIFT ENERGY PENSION PARTNERS 1991-C, LTD.
                            STATEMENTS OF OPERATIONS
                                   (Unaudited)



<TABLE>
<CAPTION>
                                                    Three Months Ended                    Nine Months Ended
                                                       September 30,                        September 30,
                                              ---------------------------------  ---------------------------------
                                                   1998              1997               1998             1997
                                              ---------------   ---------------  ---------------   ---------------
<S>                                           <C>               <C>              <C>               <C>             
REVENUES:
   Income from nonoperating interests         $        25,863   $        85,356  $       137,706   $       315,156 
   Interest income                                        287               246              816               644 
                                              ---------------   ---------------  ---------------   --------------- 
                                                       26,150            85,602          138,522           315,800 
                                              ---------------   ---------------  ---------------   --------------- 

COSTS AND EXPENSES:
   Amortization                                       301,860            39,025          373,597           143,969 
   General and administrative                          11,393            14,507           43,432            55,511 
                                              ---------------   ---------------  ---------------   --------------- 
                                                      313,253            53,532          417,029           199,480 
                                              ---------------   ---------------  ---------------   --------------- 
NET INCOME (LOSS)                             $      (287,103)  $        32,070  $      (278,507)  $       116,320 
                                              ===============   ===============  ===============   ===============



Limited Partners' net income (loss)
   per unit                                   $          (.08)  $           .01  $          (.08)  $           .03 
                                              ===============   ===============  ===============   ===============
</TABLE>


                 See accompanying notes to financial statements.

                                        4


<PAGE>


                   SWIFT ENERGY PENSION PARTNERS 1991-C, LTD.
                            STATEMENTS OF CASH FLOWS
                                   (Unaudited)


<TABLE>
<CAPTION>
                                                                                           Nine Months Ended
                                                                                             September 30,
                                                                               ---------------------------------------- 
                                                                                    1998                      1997
                                                                               ---------------          --------------- 
<S>                                                                             <C>                     <C>             
CASH FLOWS FROM OPERATING ACTIVITIES:
    Income (Loss)                                                               $     (278,507)         $       116,320 
    Adjustments to reconcile income (loss) to
      net cash provided by operations:
      Amortization                                                                     373,597                  143,969 
      Change in assets and liabilities:
        (Increase) decrease in nonoperating interests income receivable                 61,159                   12,847 
        Increase (decrease) in accounts payable                                          2,249                   (1,453)
                                                                               ---------------          --------------- 
               Net cash provided by (used in) operating activities                     158,498                  271,683 
                                                                               ---------------          --------------- 
CASH FLOWS FROM INVESTING ACTIVITIES:
    Additions to nonoperating interests in oil and gas properties                      (19,307)                  (8,769)
    Proceeds from sale of nonoperating interests in oil and gas properties              67,920                       -- 
                                                                               ---------------          --------------- 
               Net cash provided by (used in) investing activities                      48,613                   (8,769)
                                                                               ---------------          --------------- 
CASH FLOWS FROM FINANCING ACTIVITIES:
    Cash distributions to partners                                                    (207,061)                (262,869)
                                                                               ---------------          --------------- 
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS                                        50                       45 
                                                                               ---------------          --------------- 
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD                                         1,585                    1,505 
                                                                               ---------------          --------------- 
CASH AND CASH EQUIVALENTS AT END OF PERIOD                                      $        1,635          $         1,550 
                                                                               ===============          =============== 
</TABLE>


                 See accompanying notes to financial statements.

                                        5


<PAGE>


                   SWIFT ENERGY PENSION PARTNERS 1991-C, LTD.
                          NOTES TO FINANCIAL STATEMENTS
                                   (UNAUDITED)


(1)  General Information -

                  The financial statements included herein have been prepared by
        the  Partnership  and are  unaudited  except  for the  balance  sheet at
        December  31,  1997  which has been  taken  from the  audited  financial
        statements at that date. The financial  statements reflect  adjustments,
        all of which were of a normal recurring nature, which are in the opinion
        of the  managing  general  partner  necessary  for a fair  presentation.
        Certain  information  and  footnote  disclosures  normally  included  in
        financial  statements  prepared in accordance  with  generally  accepted
        accounting  principles  have  been  omitted  pursuant  to the  rules and
        regulations  of the  Securities  and Exchange  Commission  ("SEC").  The
        Partnership  believes adequate disclosure is provided by the information
        presented.  The financial  statements should be read in conjunction with
        the audited  financial  statements  and the notes included in the latest
        Form 10-K.

(2) Organization and Terms of Partnership Agreement -

                  Swift Energy Pension  Partners  1991-C,  Ltd., a Texas limited
        partnership  ("the  Partnership"),  was formed on December 30, 1991, for
        the purpose of  purchasing  net  profits  interest,  overriding  royalty
        interests and royalty interests (collectively, "nonoperating interests")
        in producing oil and gas properties within the continental United States
        and Canada. Swift Energy Company ("Swift"), a Texas corporation, and VJM
        Corporation ("VJM"), a California corporation, serve as Managing General
        Partner and Special  General Partner of the  Partnership,  respectively.
        The sole limited partner of the Partnership is Swift Depositary Company,
        which has assigned all of its beneficial  (but not of record) rights and
        interest  as  limited  partner  to  the  investors  in  the  Partnership
        ("Interest  Holders"),   in  the  form  of  Swift  Depositary  Interests
        ("SDIs").

                  The Managing  General  Partner has paid or will pay out of its
        own corporate funds (as a capital  contribution to the  Partnership) all
        selling commissions,  offering expenses,  printing, legal and accounting
        fees and other  formation costs incurred in connection with the offering
        of SDIs and the  formation  of the  Partnership,  for which the Managing
        General  Partner  will  receive  an  interest  in  continuing  costs and
        revenues of the Partnership. The 350 Interest Holders made total capital
        contributions of $3,664,333.

                  Generally,   all  continuing  costs  (including   general  and
        administrative  reimbursements  and direct  expenses)  and  revenues are
        allocated  85  percent  to the  Interest  Holders  and 15 percent to the
        general  partners.   After   partnership   payout,  as  defined  in  the
        Partnership  Agreement,  continuing costs and revenues will be shared 75
        percent by the Interest Holders, and 25 percent by the general partners.

(3)  Significant Accounting Policies -

      Use of Estimates --

                  The  preparation  of financial  statements in conformity  with
        generally accepted  accounting  principles  requires  management to make
        estimates and assumptions that affect the reported amounts of assets and
        liabilities  at the date of the  financial  statements  and the reported
        amounts of revenues and expenses  during the  reporting  period.  Actual
        results could differ from estimates. Certain reclassifications have been
        made to prior year amounts to conform to the current year presentation.

                                       6

<PAGE>


                   SWIFT ENERGY PENSION PARTNERS 1991-C, LTD.
                    NOTES TO FINANCIAL STATEMENTS (CONTINUED)
                                   (UNAUDITED)


     Nonoperating Interests in Oil and Gas Properties --

                  The Partnership accounts for its ownership interest in oil and
        gas properties using the proportionate consolidation method, whereby the
        Partnership's  share of assets,  liabilities,  revenues  and expenses is
        included in the appropriate classification in the financial statement.

                  For financial  reporting purposes the Partnership  follows the
        "full-cost"  method of accounting for nonoperating  interests in oil and
        gas property costs. Under this method of accounting,  all costs incurred
        in the acquisition of  nonoperating  interests in oil and gas properties
        are capitalized.  The unamortized cost of nonoperating  interests in oil
        and gas  properties is limited to the "ceiling  limitation"  (calculated
        separately for the Partnership,  limited partners and general partners).
        The  "ceiling  limitation"  is  calculated  on  a  quarterly  basis  and
        represents the estimated future net revenues from nonoperating interests
        in proved  properties  using current  prices  discounted at ten percent.
        Proceeds from the sale or disposition of  nonoperating  interests in oil
        and  gas  properties  are  treated  as a  reduction  of the  cost of the
        nonoperating  interests  with no gains or  losses  recognized  except in
        significant transactions.

                  The Partnership computes the provision for amortization of oil
        and gas properties on the units-of-production method. Under this method,
        the provision is calculated by multiplying the total unamortized cost of
        oil and gas  properties  by an overall rate  determined  by dividing the
        physical  units of oil and gas  produced  during the period by the total
        estimated proved oil and gas reserves at the beginning of the period.

                  The calculation of the "ceiling  limitation" and the provision
        for  depreciation,  depletion and  amortization is based on estimates of
        proved reserves. There are numerous uncertainties inherent in estimating
        quantities  of proved  reserves  and in  projecting  the future rates of
        production,  timing and plan of development. The accuracy of any reserve
        estimate  is a  function  of  the  quality  of  available  data  and  of
        engineering  and  geological  interpretation  and  judgment.  Results of
        drilling,  testing and production subsequent to the date of the estimate
        may justify revision of such estimate.  Accordingly,  reserve  estimates
        are  often  different  from  the  quantities  of oil  and gas  that  are
        ultimately recovered.

(4)  Related-Party Transactions -

                  The  Partnership  entered  into a Net Profits  and  Overriding
        Royalty  Interest  Agreement  ("NP/OR   Agreement")  with  Swift  Energy
        Operating Partners 1991-C, Ltd. ("Operating Partnership"), an affiliated
        partnership  managed  by Swift  for the  purpose  of  acquiring  working
        interests in producing  oil and gas  properties.  Under the terms of the
        NP/OR   Agreement,   the  Operating   Partnership  will  convey  to  the
        Partnership  nonoperating  interests in the aggregate net profits (i.e.,
        oil and gas  sales net of  related  operating  costs) of the  properties
        acquired equal to the Partnership's  proportionate share of the property
        acquisition costs.

(5)  Vulnerability Due to Certain Concentrations -

                  The  Partnership's  revenues are primarily the result of sales
        of its oil and natural gas production.  Market prices of oil and natural
        gas may fluctuate and adversely affect operating results.

                  In the normal  course of  business,  the  Partnership  extends
        credit,  primarily in the form of monthly oil and gas sales receivables,
        to various  companies  in the oil and gas  industry  which  results in a
        concentration  of credit risk. This  concentration of credit risk may be
        affected by changes in economic or other  conditions and may accordingly
        impact the  Partnership's  overall  credit risk.  However,  the Managing
        General  Partner  believes  that  the  risk is  mitigated  by the  size,
        reputation, and nature of the companies to which the Partnership extends
        credit.  In  addition,   the  Partnership  generally  does  not  require
        collateral or other security to support customer receivables.

                                       7

<PAGE>


                   SWIFT ENERGY PENSION PARTNERS 1991-C, LTD.
                    NOTES TO FINANCIAL STATEMENTS (CONTINUED)
                                   (UNAUDITED)


(6)  Fair Value of Financial Instruments -

                  The Partnership's  financial  instruments  consist of cash and
         cash equivalents and short-term  receivables and payables. The carrying
         amounts  approximate  fair value due to the highly liquid nature of the
         short-term instruments.

(7)  Year 2000 - 

                  The  Year  2000  issue  results  from  computer  programs  and
        embedded computer chips with date fields that cannot distinguish between
        the year  1900 and 2000.  The  Managing  General  Partner  is  currently
        implementing  the steps necessary to make its operations and the related
        operations of the Partnership  Year 2000 compliant.  These steps include
        upgrading,  testing and certifying  computer systems and field operation
        services  and  obtaining  Year 2000  compliance  certification  from all
        important business suppliers. The Managing General Partner formed a task
        force  during the year to address the Year 2000 issue to ensure that all
        of its business systems are Year 2000 compliant by mid-1999 with mission
        critical systems projected to be compliant by the end of 1998.

                  The Managing  General  Partner's  business  systems are almost
        entirely  comprised of  off-the-shelf  software.  Most of the  necessary
        changes in computer  instructional  code can be made by  upgrading  this
        software.  The Managing  General  Partner is currently in the process of
        either upgrading the off-the-shelf  software or receiving  certification
        as to Year 2000  compliance from vendors or third party  consultants.  A
        testing  phase will be conducted as the software is updated or certified
        and is expected to be complete by mid-1999.

                  The  Managing  General  Partner  does not  believe  that costs
        incurred  to address  the Year 2000 issue with  respect to its  business
        systems  will have a  material  effect on the  Partnership's  results of
        operations,  liquidity and financial condition. The estimated total cost
        to the Managing General Partner to address Year 2000 issues is projected
        to be less than $150,000, most of which will be spent during the testing
        phase in the next nine months.  The Partnership's  share of this cost is
        expected to be insignificant.

                  The  failure  to correct a material  Year 2000  problem  could
        result in an  interruption,  or a failure of,  certain  normal  business
        activities or  operations.  Based on  activities  to date,  the Managing
        General  Partner  believes that it will be able to resolve any Year 2000
        problems  concerning  its  financial  and  administrative  systems.  The
        Managing  General Partner is uncertain,  however,  as to the impact that
        the Year  2000  issue  will  have on field  operations  or as to how the
        Managing General Partner or the Partnership will be indirectly  affected
        by the impact that the Year 2000 issue will have on companies with which
        it conducts  business.  For example,  the pipeline operators to whom the
        Managing General Partner sells the Partnership's natural gas, as well as
        other customers and suppliers, could be prone to Year 2000 problems that
        could not be assessed or detected by the Managing General  Partner.  The
        Managing  General  Partner  plans  to  contact  its  major   purchasers,
        customers,  suppliers,  financial  institutions  and others with whom it
        conducts  business to determine whether they will be Year 2000 compliant
        and  whether  they will be able to resolve  in a timely  manner any Year
        2000  problems.  Based upon these  responses and any problems that arise
        during the testing phase,  contingency plans or back-up systems would be
        determined and addressed.


                                       8


<PAGE>


                   SWIFT ENERGY PENSION PARTNERS 1991-C, LTD.
                MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL
                       CONDITION AND RESULTS OF OPERATIONS

GENERAL

      The  Partnership  was formed for the purpose of investing in  nonoperating
interests in producing oil and gas  properties  located  within the  continental
United States and Canada.  In order to accomplish  this,  the  Partnership  goes
through two distinct yet  overlapping  phases with respect to its  liquidity and
results of  operations.  When the  Partnership  was  formed,  it  commenced  its
"acquisition"  phase,  with all funds  placed in  short-term  investments  until
required for the acquisition of nonoperating interests.  Therefore, the interest
earned on these pre-acquisition investments becomes the primary cash flow source
for initial  partner  distributions.  As the Partnership  acquires  nonoperating
interests  in producing  properties,  net cash from  ownership  of  nonoperating
interests becomes available for distribution,  along with the investment income.
After all  partnership  funds have been  expended on  nonoperating  interests in
producing oil and gas properties, the Partnership enters its "operations" phase.
During  this  phase,  income from  nonoperating  interests  in oil and gas sales
generates  substantially  all revenues,  and  distributions  to Interest Holders
reflect those revenues less all associated partnership expenses. The Partnership
may also derive proceeds from the sale of nonoperating interests in acquired oil
and gas properties,  when the sale of such interests is economically appropriate
or preferable to continued operations.

LIQUIDITY AND CAPITAL RESOURCES

      Oil and gas reserves are depleting  assets and therefore often  experience
significant  production  declines each year from the date of acquisition through
the end of the life of the  property.  The primary  source of  liquidity  to the
Partnership comes almost entirely from the income generated from the sale of oil
and gas produced from ownership  interests in oil and gas  properties.  Net cash
provided by  operating  activities  totaled  $158,498  and $271,683 for the nine
months ended September 30, 1998 and 1997, respectively. This source of liquidity
and the related  results of  operations,  and in turn cash  distributions,  will
decline in future periods as the oil and gas produced from these properties also
declines while production and general and administrative costs remain relatively
stable making it unlikely that the  Partnership  will hold the properties  until
they are fully depleted,  but will likely liquidate when a substantial  majority
of the reserves  have been  produced.  Cash  provided by property  sale proceeds
totaled  $67,920 for the nine months ended  September 30, 1998. The  Partnership
has  expended  all of the  partners'  net  commitments  available  for  property
acquisitions and development by acquiring producing oil and gas properties.  The
partnership invests primarily in proved producing properties with nominal levels
of future costs of development for proven but undeveloped reserves.  Significant
purchases  of  additional  reserves  or  extensive  drilling  activity  are  not
anticipated.  Cash  distributions  totaled  $207,061  and  $262,869 for the nine
months ended September 30, 1998 and 1997, respectively.

      The  Partnership  does  not  allow  for  additional  assessments  from the
partners or Interest Holders to fund capital  requirements.  However,  funds are
available  from  partnership  revenues or proceeds from the sale of  partnership
property.  The  Managing  General  Partner  believes  that the  funds  currently
available to the Partnership  will be adequate to meet any  anticipated  capital
requirements.

RESULTS OF OPERATIONS

      The  following  analysis  explains  changes  in the  revenue  and  expense
categories  for the quarter  ended  September  30, 1998  (current  quarter) when
compared to the quarter ended September 30, 1997  (corresponding  quarter),  and
for the nine months ended September 30, 1998 (current period),  when compared to
the nine months ended September 30, 1997 (corresponding period).

Three Months Ended September 30, 1998 and 1997

      Income  from  nonoperating  interests  decreased  70  percent in the third
quarter of 1998 when  compared  to the same  quarter in 1997.  Oil and gas sales
declined $69,735 or 51 percent in the third quarter of 1998 when compared to the
corresponding  period in 1997,  primarily due to decreased oil and gas prices. A
decline in oil prices of 39 percent or $5.80/BBL and in gas prices of 20 percent
or $.47/MCF had a significant impact on partnership  performance.  Also, current
quarter oil and gas production  declined 58 and 27 percent,  respectively,  when
compared  to the  same  quarter  in  1997,  further  contributing  to  decreased
revenues.

                                       9

<PAGE>


                   SWIFT ENERGY PENSION PARTNERS 1991-C, LTD.
                MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL
                 CONDITION AND RESULTS OF OPERATIONS (CONTINUED)


      Total  amortization  expense for the third  quarter of 1998  increased 674
percent or $262,835 when compared to the third quarter of 1997. Two  components,
the normal  provision,  calculated  on the units of production  method,  and the
additional  provision,  relating  to  the  ceiling  limitation,  make  up  total
amortization expense. Normal amortization expense decreased 16 percent or $6,158
in the  third  quarter  of 1998 when  compared  to the  third  quarter  of 1997,
relating to the decrease in production volumes.

      The Partnership  recorded an additional  provision in amortization for the
third  quarter in 1998 of $268,993  when the present  value,  discounted  at ten
percent, of estimated future net revenues from oil and gas properties, using the
guidelines of the Securities and Exchange Commission,  was below the fair market
value  originally  paid  for oil and gas  properties  resulting  in a full  cost
ceiling impairment.

Nine Months Ended September 30, 1998 and 1997

      Income from nonoperating  interests decreased 56 percent in the first nine
months  of 1998 when  compared  to the same  period  in 1997.  Oil and gas sales
declined $225,885 or 46 percent in the first nine months of 1998 compared to the
corresponding period in 1997, primarily due to decreased gas and oil production.
Gas production  decreased 35 percent and oil production declined 30 percent. The
decrease  in  production   volumes  had  a  significant  impact  on  partnership
performance.  The partnership's sale of several properties in the fourth quarter
of 1997 and in the  first  quarter  of 1998 had an  impact  on 1998  partnership
production volumes.  Also, current period oil and gas prices declined 35 percent
or $5.87/BBL and 11 percent or $.23/MCF,  respectively,  further contributing to
decreased revenues.

      Total amortization expense for the first nine months of 1998 increased 159
percent  or  $229,628  when  compared  to the first  nine  months  of 1997.  Two
components, the normal provision,  calculated on the units of production method,
and the additional provision,  relating to the ceiling limitation, make up total
amortization  expense.  Normal  amortization  expense  decreased  27  percent or
$39,365 in the first nine months of 1998 when  compared to the first nine months
of 1997, relating to the decrease in production volumes.

      The Partnership  recorded an additional  provision in amortization for the
first nine months in 1998 of $268,993 when the present value,  discounted at ten
percent, of estimated future net revenues from oil and gas properties, using the
guidelines of the Securities and Exchange Commission,  was below the fair market
value  originally  paid  for oil and gas  properties  resulting  in a full  cost
ceiling impairment.

      During 1998,  partnership  revenues  and costs will be shared  between the
Interest Holders and general partners in an 85:15 ratio.


                                       10


<PAGE>


                   SWIFT ENERGY PENSION PARTNERS 1991-C, LTD.
                           PART II - OTHER INFORMATION




ITEM 5.    OTHER INFORMATION


                                     -NONE-





                                       11


<PAGE>


                                   SIGNATURES



Pursuant to the  requirements of Section 13 or 15(d) 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.


                                       SWIFT ENERGY PENSION
                                       PARTNERS 1991-C, LTD.
                                       (Registrant)

                            By:        SWIFT ENERGY COMPANY
                                       Managing General Partner


Date:  November 4, 1998     By:        /s/ John R. Alden
       ----------------                ----------------------------------------
                                       John R. Alden
                                       Senior Vice President, Secretary
                                       and Principal Financial Officer

Date:  November 4, 1998     By:        /s/ Alton D. Heckaman, Jr.
       ----------------                ----------------------------------------
                                       Alton D. Heckaman, Jr.
                                       Vice President, Controller
                                       and Principal Accounting Officer


                                       12