<PAGE>

                       SECURITIES AND EXCHANGE COMMISSION

                             Washington, D.C. 20549
                            -------------------------

                                    FORM 8-K

                                 CURRENT REPORT

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

       Date of Report (or Date of Earliest Event Reported): June 26, 1998



                          SWIFT ENERGY MANAGED PENSION
                         ASSETS PARTNERSHIP 1991-A, LTD.
             (Exact name of Registrant as specified in its charter)


        TEXAS                    33-15988-12               76-0325631

(State of incorporation    (Commission File Number)       (IRS Employer
    or organization)                                    Identification No.)


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



                                 (281) 874-2700
                         (Registrant's telephone number)


<PAGE>

ITEM 2.  Disposition of Assets
         ---------------------

     Substantially  all of the assets of Swift Energy  Managing  Pension  Assets
Partnership  1991-A,  Ltd.  (the  "Partnership"),  consisting  of  non-operating
interests  in  real  property  and in oil  and  gas  reserves  located  therein,
("Property  Interests")  were sold as of March 1, 1998.  A portion of the assets
were sold at auction and the remaining assets were sold to Swift Energy Company,
the Managing  General Partner of the  Partnership,  after first being offered to
third parties at auction with a set minimum bid price based upon an appraisal of
the value of the Property Interests by an independent  consultant.  The Property
Interests in the AWP Field in McMullen  County,  Texas, and the Gloster Jacob #1
well in Marion County, Mississippi, received no bids at or above the set minimum
bid price from third  parties  at  auction.  Thereafter,  the  Managing  General
Partner  acquired these  Property  Interests at the minimum bid price set by the
independent  appraisal.  The  price  paid to the  Partnership  for the  Property
Interests  acquired by the Managing General Partner  accounted for approximately
50% of the total proceeds received from the sale of the  Partnership's  Property
Interests.  The Property Interests sold at auction included partial interests in
the  following two  properties;  the Manville 5-15 #1 and #1-D and the Green #1,
both  properties  located in Louisiana.  The  interests in these two  properties
accounted for approximately 33% of the total proceeds. The total proceeds to the
Partnership,  net of selling expenses,  were $87,304. The limited partners share
was  $78,574.  An  initial  distribution  of  proceeds  was made to the  limited
partners  on April 15,  1998,  representing  all the  assets of the  Partnership
except for  insubstantial  amounts held back for contingency  purposes.  A small
final distribution is anticipated to be made on or about June 30, 1998, at which
time the  Partnership  will  dissolve  pursuant  to the  Texas  Revised  Limited
Partnership Act.



                                    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, hereunto duly authorized person.

Dated: June 26, 1998


                        SWIFT ENERGY MANAGED PENSION ASSETS
                        PARTNERSHIP 1991-A, LTD.


                        By:  Swift Energy Company, as Managing General Partner



                              By:  ----------------------------------------
                                   Alton D. Heckaman, Jr.
                                   Vice President and Controller


                                       2
[{"type": "8-K", "sequence": "1", "description": "DISSOLUTION OF PARTNERSHIP", "secsgml_size_bytes": 3977}]
{"company-data": {"conformed-name": "SWIFT ENERGY MANAGED PENSION ASSETS PARTNERSHIP 1991-A LTD", "cik": "0000874957", "assigned-sic": "1311", "irs-number": "760325631", "state-of-incorporation": "TX", "fiscal-year-end": "1231"}, "filing-values": {"form-type": "8-K", "act": "34", "file-number": "000-20149", "film-number": "98654687"}, "business-address": {"street1": "16825 NORTHCHASE DR STE 400", "city": "HOUSTON", "state": "TX", "zip": "77060", "phone": "7138742700"}, "mail-address": {"street1": "16825 NORTHCHASE DR", "street2": "SUITE 400", "city": "HOUSTON", "state": "TX", "zip": "77060"}}
SECURITIES AND EXCHANGE COMMISSION

                             Washington, D.C. 20549
                            -------------------------

                                    FORM 8-K

                                 CURRENT REPORT

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

       Date of Report (or Date of Earliest Event Reported): June 26, 1998

                          SWIFT ENERGY MANAGED PENSION
                         ASSETS PARTNERSHIP 1991-A, LTD.
             (Exact name of Registrant as specified in its charter)

        TEXAS                    33-15988-12               76-0325631

(State of incorporation    (Commission File Number)       (IRS Employer
    or organization)                                    Identification No.)

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

                                 (281) 874-2700
                         (Registrant's telephone number)
ITEM 2.  Disposition of Assets
         ---------------------

     Substantially  all of the assets of Swift Energy  Managing  Pension  Assets
Partnership  1991-A,  Ltd.  (the  "Partnership"),  consisting  of  non-operating
interests  in  real  property  and in oil  and  gas  reserves  located  therein,
("Property  Interests")  were sold as of March 1, 1998.  A portion of the assets
were sold at auction and the remaining assets were sold to Swift Energy Company,
the Managing  General Partner of the  Partnership,  after first being offered to
third parties at auction with a set minimum bid price based upon an appraisal of
the value of the Property Interests by an independent  consultant.  The Property
Interests in the AWP Field in McMullen  County,  Texas, and the Gloster Jacob #1
well in Marion County, Mississippi, received no bids at or above the set minimum
bid price from third  parties  at  auction.  Thereafter,  the  Managing  General
Partner  acquired these  Property  Interests at the minimum bid price set by the
independent  appraisal.  The  price  paid to the  Partnership  for the  Property
Interests  acquired by the Managing General Partner  accounted for approximately
50% of the total proceeds received from the sale of the  Partnership's  Property
Interests.  The Property Interests sold at auction included partial interests in
the  following two  properties;  the Manville 5-15 #1 and #1-D and the Green #1,
both  properties  located in Louisiana.  The  interests in these two  properties
accounted for approximately 33% of the total proceeds. The total proceeds to the
Partnership,  net of selling expenses,  were $87,304. The limited partners share
was  $78,574.  An  initial  distribution  of  proceeds  was made to the  limited
partners  on April 15,  1998,  representing  all the  assets of the  Partnership
except for  insubstantial  amounts held back for contingency  purposes.  A small
final distribution is anticipated to be made on or about June 30, 1998, at which
time the  Partnership  will  dissolve  pursuant  to the  Texas  Revised  Limited
Partnership Act.

                                    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, hereunto duly authorized person.

Dated: June 26, 1998

                        SWIFT ENERGY MANAGED PENSION ASSETS
                        PARTNERSHIP 1991-A, LTD.

                        By:  Swift Energy Company, as Managing General Partner

                              By:  ----------------------------------------
                                   Alton D. Heckaman, Jr.
                                   Vice President and Controller

                                       2