FIRST AMENDMENT
                              TO THIRD AMENDED AND
                      RESTATED LOAN AND SECURITY AGREEMENT
                            AND MODIFICATION OF NOTES


     THIS FIRST  AMENDMENT  TO THIRD  AMENDED  AND  RESTATED  LOAN AND  SECURITY
AGREEMENT AND  MODIFICATION  OF NOTES (the  "Amendment") is dated as of November
22, 1996,  and entered into by and between THE CIT  GROUP/CREDIT  FINANCE,  INC.
("Lender") with its office at 10 South LaSalle Street, Chicago,  Illinois 60603,
and YALE E. KEY, INC.  ("Yale"),  KEY ENERGY  DRILLING,  INC.  (d/b/a Clint Hurt
Drilling) ("Hurt") and WELLTECH EASTERN, INC. ("WellTech")  (individually each a
"Borrower" and collectively the "Borrowers").

         WHEREAS,  Lender and  Borrowers  have entered  into that certain  Third
Amended  and  Restated  Loan and  Security  Agreement  dated as of May 21,  1996
("Agreement");

         WHEREAS,  in connection with the execution of the Agreement,  Borrowers
executed and delivered to Lender the following  promissory  notes  (collectively
the "Notes"):

         (i)      Amended  and  Restated  Promissory  Note  dated  May 21,  1996
                  executed  by  WellTech  payable  to  Lender  in  the  original
                  principal amount of $11,822,186.00 (the "WellTech Note");

         (ii)     Amended  and  Restated  Promissory  Note  dated  May 21,  1996
                  executed by Yale payable to Lender in the  original  principal
                  amount of $10,004,082.00 (the "Yale Note"); and

         (iii)    Amended  and  Restated  Promissory  Note  dated  May 21,  1996
                  executed by Hurt payable to Lender in the  original  principal
                  amount of $1,230,000.00 (the "Hurt Note"); and

         WHEREAS, on or about July 3, 1996 Key Energy Group, Inc. ("Key") issued
and sold  $52,000,000  in the  aggregate  principal  amount  of its  convertible
subordinated  debentures  due 2003  (the  "Debentures")  pursuant  to a  Private
Offering  Memorandum  dated June 28,  1996;  and on August 29,  1996,  Key,  the
Borrowers,  and American Stock Transfer and Trust Company,  as Trustee,  entered
into that certain Indenture (the "Indenture"); and

         WHEREAS, part of the proceeds of the Debentures were used to repay the
Notes; and

         WHEREAS,  Borrowers have requested certain amendments to the Agreement,
including  the ability to reborrow  part of the amounts  repaid under the Notes,
all as more fully set forth herein; and

         WHEREAS,  Lender has agreed to the  amendments set forth herein subject
to the terms and conditions provided for in this Amendment; and

FINS2DAL:40474.4  18739-00020
                                                        -1-





         WHEREAS, Lender and Borrowers desire to amend the Agreement and to 
modify the Notes as hereinafter set forth;

         NOW,   THEREFORE,   in  consideration  of  the  mutual  conditions  and
agreements  set forth in the  Agreement and this  Amendment,  and other good and
valuable  consideration,  the  receipt  and  sufficiency  of  which  are  hereby
acknowledged,  the  parties,  intending  to be legally  bound,  hereby  agree as
follows:

                                                     ARTICLE I

                                                    Definitions

         Section 1.01.  Definitions.  Capitalized terms used in this Amendment, 
to the extent not otherwise defined herein, shall have the same meanings as in 
the Agreement, as amended hereby.

         Section 1.02.     New Definitions.  The following new definitions are 
hereby added to the
Agreement:

                  "Hurt Note" means the Amended  and  Restated  Promissory  Note
         dated May 21, 1996  executed by Hurt  payable to Lender in the original
         principal  amount of  $1,230,000  as amended and modified  from time to
         time.

                  "Indenture" means the Indenture entered into by Key Energy 
         Group, Inc., the
         Borrowers, and American Stock Transfer and Trust Company, as Trustee, 
         dated August 29,
         1996.

                  "Parent" means Key Energy Group, Inc., a Delaware corporation,
         and owner and holder of 100% of the common stock of each Borrower.

                  "Parent  Guaranty" means the Guaranty dated as of May 21, 1996
         made by Parent in favor of Lender.

                  "WellTech Note" means the Amended and Restated Promissory Note
         dated  May 21,  1996  executed  by  WellTech  payable  to Lender in the
         original  principal  amount of $11,822,186 as amended and modified from
         time to time.

                  "Yale Note" means the Amended  and  Restated  Promissory  Note
         dated May 21, 1996  executed by Yale  payable to Lender in the original
         principal  amount of  $10,004,082  as amended and modified from time to
         time.


FINS2DAL:40474.4  18739-00020
                                                        -2-





                                                    ARTICLE II

                                                    Amendments

         Section 2.01.     Amendment to Section 6.4 of the Agreement.  
Section 6.4 of the Agreement
is hereby amended in its entirety to read as follows:

                  "6.4 (a) Each Borrower's books and records concerning accounts
         and its chief executive officer are and shall be maintained only at the
         address set forth in Section 10.6(d). Each Borrower's only other places
         of business and the only other locations of Collateral, if any, are and
         shall be the addresses set forth in Section 10.6(e) hereof,  except any
         Borrower may change such  locations in the ordinary  course of business
         or open a new place of business  after  thirty (30) days prior  written
         notice to Lender;  provided,  however, if such new place of business is
         the  result of an  acquisition  of the  business  or assets of  another
         entity and is located in a state other than a state where  Lender has a
         currently filed financing  statement  reflecting the acquiring Borrower
         as  "Debtor",  then such notice  period will be reduced to fifteen (15)
         days.  Prior to any change in  location  or opening of any new place of
         business,  each  Borrower  shall  execute  and  deliver  or cause to be
         executed and delivered to Lender such financing  statements,  financing
         documents,  mortgages,  and security and other agreements as Lender may
         reasonably require, including,  without limitation,  those described in
         Section 6.14.  Without otherwise  limiting the effect of the foregoing,
         Borrower  may  change  the  location  of its  well  servicing  rigs and
         drilling rigs without prior approval of Lender; provided, however, such
         well servicing rigs and drilling rigs may not be removed from the state
         where they are located as of the date hereof  without  notice to Lender
         if such  removal  would cause  Lender's  security  interest  therein to
         lapse,  and Borrowers  shall within five (5) days of Lender's  request,
         provide  Lender  with a listing of the  current  locations  of all well
         servicing rigs and drilling rigs.

                  (b) Notwithstanding the foregoing provisions of Section 6.4(a)
         hereof,  any  Borrower  may open a new place of business in  connection
         with the  acquisition  of the  business  and assets of  another  entity
         without such prior notice and document  execution  and delivery if such
         new  place  of  business  is  located  in a state  where  Lender  has a
         currently filed financing  statement  reflecting the acquiring Borrower
         as  "Debtor".  Borrower  shall,  within  five  (5) days  following  the
         consummation of such acquisition,  give Lender notice thereof and shall
         promptly  thereafter  execute and  deliver  such  additional  financing
         statements,  financing  documents,  mortgages,  and  security and other
         agreements  as  Lender  may  reasonably  require,  including,   without
         limitation, those described in Section 6.14."

         Sectioon 2.02.  Amendment to Section 6.6 of the Agreement.  Section 6.6
of the Agreement is hereby amended in its entirety to read as follows:

                  "6.6     No Borrower shall directly or indirectly:  (a) sell,
lease, transfer, assign, abandon or otherwise dispose of any part of the 
Collateral or any material

FINS2DAL:40474.4  18739-00020
                                                        -3-





         portion of its other assets (other than sales of inventory to buyers in
         the ordinary course of business) or (b) consolidate  with or merge into
         any other entity."

         Section  2.03.  Amendment  to Section 6.12 of the  Agreement.  The last
sentence of Section 6.12 of the Agreement is hereby amended to read as follows:

         "In addition,  WellTech may make  intercompany  loans to WellTech's 63%
         owned subsidiary, Servicios WellTech, S.A. ("Servicios") as long as (a)
         all such intercompany loans are properly documented on WellTech's books
         and records, (b) all such intercompany loans are memorialized by one or
         more Intercompany Note and Security  Agreements (the "Servicios Chattel
         Paper"),  (c) no such additional  intercompany loans to Servicios after
         January 19, 1996 would exceed the amount of $2,000,000 which is part of
         the principal  amount as set forth in the related  Amended and Restated
         Intercompany  Note and Security  Agreement  executed by Servicios dated
         November 22, 1996, and (d) Lender retains a properly perfected security
         interest  in  the   Servicios   Chattel  Paper  at  the  time  of  such
         intercompany loan."

The remaining provisions of Section 6.12 are unchanged.

         Section 2.04.     Amendment to Section 6.20 of the Agreement.  Section 
6.20 of the Agreement is hereby amended in its entirety to read as follows:

         "6.20    RESERVED."

         Section 2.05. Amendment to Section 7.1 of the Agreement. Section 7.1 of
the  Agreement  is hereby  amended by the  addition  of a new "Event of Default"
subsection (m) which reads as follows:

         "(m)     The occurrence and continuance of an event of default under 
the Indenture."

All remaining provisions of Section 7.1 are unchanged.

         Section 2.06.     Amendment to Section 9.1 of the Agreement.  Section 
9.1 of the Agreement
is hereby amended in its entirety to read as follows:

         "9.1  Term.  This  Agreement  shall  only  become  effective  upon  the
         execution  and delivery of this  Agreement by each  Borrower and Lender
         and shall  continue in full force and effect until either  December 31,
         2001,  or January  5, 2002,  at  Lender's  option,  and shall be deemed
         automatically  renewed for successive terms of two (2) years thereafter
         unless  terminated  as of the end of the  initial or any  renewal  term
         (each a "Term") by the Lender or any Borrower  giving the other parties
         hereto  written notice at least sixty (60) days prior to the end of the
         then-current Term."

         Section 2.07.     Amendment to Section 9.2 of the Agreement.  
Section 9.2 of the Agreement
is hereby amended in its entirety to read as follows:


FINS2DAL:40474.4  18739-00020
                                                        -4-





         "9.2 In  consideration of the issuance of a warrant to purchase 125,000
         shares of the common  stock of Parent,  Lender  agrees  that any of the
         Borrowers may also  terminate  this Agreement by giving Lender at least
         thirty (30) days prior written  notice at any time upon payment in full
         of all of the Obligations as provided herein,  including the applicable
         early termination fee provided below.  Lender shall also have the right
         to terminate this Agreement at any time upon or after the occurrence of
         an Event of Default.  If Lender terminates this Agreement upon or after
         the occurrence of an Event of Default, or if any of the Borrowers shall
         terminate this Agreement as permitted herein effective prior to the end
         of the  then-current  Term, in addition to all other  Obligations,  the
         Borrowers  collectively shall pay to Lender, upon the effective date of
         termination,  in view of the  impracticality  and extreme difficulty of
         ascertaining  actual damages and by mutual  agreement of the parties as
         to  a  reasonable  calculation  of  Lender's  lost  profits,  an  early
         termination fee equal to:

                  (a)      $400,000 if the effective date of such termination 
         occurs on or before November 22, 1997;

                  (b)      $300,000 if the effective date of such termination 
         occurs after November 22, 1997 but on or before November 22, 1998;

                  (c) $200,000 if the effective date of such termination  occurs
         after  November  22, 1998 but on or before the end of the then  current
         Term.

                  If  Borrowers   terminate   this   Agreement   and  repay  the
         Obligations  without having  provided  Lender with at least thirty (30)
         days' prior written  notice  thereof,  Borrowers  will pay to Lender an
         additional  amount  equal  to  thirty  (30)  days  of  interest  at the
         applicable  Interest Rate, based on the average  outstanding  amount of
         the  Obligations  for the six (6) month  period  preceding  the date of
         termination."

         Section 2.08.     Amendment to Section 9.3 of the Agreement.  Section 
         9.3 of the Agreement is hereby amended in its entirety to read as 
         follows:

                  "9.3.    Borrower may prepay, in whole or in part, the Term 
         Loans prior to the end of the then current Term without any premium or 
         penalty."

         Section 2.09.     Amendment to Section 10.1 of the Agreement.  Section 
         10.1 of the Agreement is hereby amended in its entirety to read as 
         follows:

         "10.1    (a)      Maximum Credit: $40,000,000

                  (b)      Eligible  Accounts  Percentage:  Eighty-Five  Percent
                           (85%)  so long  as the  dilution  percentage  of such
                           accounts does not exceed Four Percent (4%)  whereupon
                           the Eligible Accounts  Percentage shall be reduced to
                           an amount deemed reasonable by Lender.


FINS2DAL:40474.4  18739-00020
                                                        -5-





                  (c)      Maximum   days  after   Invoice   Date  for  Eligible
                           Accounts: 90 days; provided, however, that Lender may
                           make advances up to  $250,000.00  in the aggregate at
                           any given time against  Eligible  Accounts  which are
                           between 91 days and 120 days past invoice date.

                  (d)      Minimum Borrowing:  $12,000,000.

                  (e)      Sublimits:

                           (i)      For Yale, $40,000,000 less all Obligations 
                                    of Hurt and WellTech;

                           (ii)     For Hurt, the lesser of (i) $2,000,000, and
                                    (ii) $40,000,000 less all
                                    Obligations of Yale and WellTech; and

                           (iii)    For WellTech, $40,000,000 less all 
                                    Obligations of Hurt and Yale."

         Section 2.10.     Amendment to Section 10.2(a) of the Agreement.  
Section 10.2(a) of the
Agreement is hereby amended in its entirety to read as follows:

         "(a)     Term Loan:

                           (i)      For Yale, up to but not to exceed
                                    $8,932,231.21 (the "Maximum
                                    Amount");

                           (ii)     For Hurt, up to but not to exceed 
                                    $1,091,239.41 (the "Maximum
                                    Amount");  and

                           (iii)    For WellTech, up to but not to exceed 
                                    $9,666,309.60 (the "Maximum
                                    Amount")."

         Section 2.11.     Amendment to Section 10.4 of the Agreement.  
                           Section 10.4 of the Agreement
                           is hereby amended in its entirety to read as follows:

         "10.4    Fees:

                  (a)      Interest Rate:  Prime Rate plus .50% per annum

                  (b)      Closing Fees:  None

                  (c)      Unused Line Fee Rate:  .25% per annum payable on the
                           first day of the following month."

         Section 2.12.     Amendment to Section 10.5 of the Agreement.  
Section 10.5 of the Agreement
is hereby amended in its entirety to read as follows:



FINS2DAL:40474.4  18739-00020
                                                        -6-





         "10.5 Financial  Covenants:  Unless  indicated  otherwise,  all amounts
         below  shall  be  determined  in  accordance  with  generally  accepted
         accounting  principles,  in  effect  on the date  hereof,  consistently
         applied:

                  (a)      "Consolidated  Debt Service (Fixed  Charge)  Coverage
                           Ratio"  means the ratio of (a) the sum of net  income
                           plus (i) depreciation and amortization  expenses plus
                           (ii) increases in deferred taxes less (iii) decreases
                           in  deferred   taxes   resulting  from  tax  payments
                           actually made;  divided by (b) the sum of payments on
                           long  term   indebtedness   plus  (i)  capital  lease
                           payments plus (ii) any unfunded capital expenditures;
                           (c) determined on a consolidated basis.

                           Testing  of the  following  ratio will begin on March
31, 1996.

                           Parent   and  its   Subsidiaries   will   maintain  a
                           Consolidated  Debt Service  (Fixed  Charge)  Coverage
                           Ratio of not less than 1.50 to 1.00, such ratio to be
                           tested at the end of each  calendar  quarter (i.e. as
                           of March 31, June 30,  September  30 and December 31)
                           based on the prior 12- month period.

(b)   "Consolidated   Tangible   Net  Worth"  means  the  amount  by  which  the
- -------------------------------   sum   of   (a)   Shareholders'   Equity   plus
Subordinated   Debt  (non-current   balance)  exceeds  (b)  Intangible   Assets,
determined on a  consolidated  basis for Parent and its  Subsidiaries.  For this
purpose:  "Shareholders  Equity" means shareholders' equity determined according
to GAAP;  and  "Intangible  Assets"  means  (i)  assets  which  are  treated  as
intangible  pursuant to GAAP;  (ii)  obligations  owing by any persons  that are
officers, directors, shareholders, employees, subsidiaries or affiliates, or any
entity in which any such person owns any interest;  and (iii) any asset which is
intangible or lacks intrinsic and marketable value or collectibility,  including
without limitation goodwill,  noncompetition  agreements,  patents,  copyrights,
trademarks,  franchises  or  organization  or research  and  development  costs,
prepaid expenses or investments in  subsidiaries/affiliates;  and (iv) any other
assets determined to be intangible by Lender in its reasonable credit judgment.

                           Parent   and  its   Subsidiaries   will   maintain  a
                           Consolidated  Tangible  Net  Worth of not  less  than
                           $35,000,000,  such net  worth to be  tested as of the
                           end of each  calendar  quarter  (i.e. as of March 31,
                           June 30, September 30 and December 31).

                  (c)      Total Senior Secured Liabilities (as defined by GAAP)
                           to Consolidated
                           Tangible Net Worth:


FINS2DAL:40474.4  18739-00020
                                                        -7-





                           Parent and its Subsidiaries  will not allow the ratio
                           of Total Senior Secured  Liabilities to  Consolidated
                           Tangible  Net Worth to be  greater  than .90 to 1.00,
                           such ratio to be tested as of the end of any calendar
                           quarter (i.e.  as of March 31, June 30,  September 30
                           and December 31).

                  (d)      Total Current Assets (as defined by GAAP) to Total 
                           Current Liabilities (as
                           defined by GAAP).

                           Parent and its Subsidiaries  will maintain a ratio of
                           Total Current Assets to Total Current  Liabilities of
                           not less than 1.15 to 1.0, such ratio to be tested as
                           of the end of any calendar  quarter (i.e. as of March
                           31, June 30, September 30 and December 31)."

         Section  2.13.  Amendment  to Schedule  6.12.  Schedule  6.12 is hereby
amended in its entirety and replaced with "Amended  Schedule  6.12"  attached to
the First  Amendment and  incorporated  and made a part of the Agreement by this
reference.

                                                    ARTICLE III

                                              Modifications to Notes

         Section 3.01.     Amendments to Hurt Note.  The first three (3) 
paragraphs of the Hurt Note
are hereby amended in their entirety to read as follows:

                  "FOR VALUE RECEIVED,  KEY ENERGY  DRILLING,  INC., D/B/A CLINT
         HURT DRILLING, a Delaware corporation,  promises to pay to the order of
         THE CIT GROUP/CREDIT  FINANCE, INC. ("CIT"), at its offices at 10 South
         LaSalle  Street,  Chicago,  Illinois  60603 or such other  place as the
         holder  hereof may from time to time  designate  in  writing,  in legal
         tender  of the  United  States of  America,  the  principal  sum of One
         Million  Ninety One Thousand Two Hundred Thirty Nine and 41/100 Dollars
         ($1,091,239.41)  or so much  thereof as may be borrowed  hereunder  and
         reflected on Schedule "A" attached hereto and made a part hereof,  plus
         interest  from the date  hereof  on the  unpaid  principal  balance  as
         follows:

                  The principal  amount available to be borrowed under this Note
         (the "Maximum  Amount")  shall be  automatically  reduced by $14,642.86
         each month,  and at no time shall the outstanding  principal exceed the
         Maximum Amount.  The principal sum hereof  outstanding shall be due and
         payable  on the end of the  "Term"  as  defined  in the Loan  Agreement
         described herein.

                  Interest  shall be earned at the rate (the  "Annual  Rate") of
         one-half  percent  (.50%) per annum plus the "Prime  Rate".  The "Prime
         Rate" is the per annum rate of  interest  publicly  announced  by Chase
         Manhattan  Bank,  New York,  New York,  or the  applicable  rate of its
         successors  or assigns,  from time to time as its prime rate (the prime
         rate is not intended to be the lowest rate of interest charged by Chase

FINS2DAL:40474.4  18739-00020
                                                        -8-





         Manhattan  Bank, New York,  New York, or its successors or assigns,  to
         its  borrowers).  Such interest shall be payable  monthly in arrears on
         the first day of each and every month,  commencing  on the first day of
         the  month  after  an  advance  is made  hereunder.  Interest  shall be
         computed on the unpaid  principal  balance and shall be calculated on a
         year of 360 days for actual days  elapsed.  Interest and  principal not
         paid when due shall bear  interest at a rate equal to two percent  (2%)
         per annum in excess of the Annual Rate."

The remaining provisions of the Hurt Note are unchanged.

         Section  3.02.  Amendments  to  WellTech  Note.  The  first  three  (3)
paragraphs of the WellTech Note are hereby  amended in their entirety to read as
follows:

                  "FOR  VALUE  RECEIVED,  WELLTECH  EASTERN,  INC.,  a  Delaware
         corporation,  promises  to pay to the  order  of THE  CIT  GROUP/CREDIT
         FINANCE,  INC.  ("CIT"),  at its  offices at 10 South  LaSalle  Street,
         Chicago,  Illinois  60603 or such other place as the holder  hereof may
         from time to time  designate in writing,  in legal tender of the United
         States of  America,  the  principal  sum of Nine  Million  Six  Hundred
         Sixty-Six    Thousand   Three   Hundred   Nine   and   60/100   Dollars
         ($9,666,309.60)  or so much  thereof as may be borrowed  hereunder  and
         reflected on Schedule "A" attached hereto and made a part hereof,  plus
         interest  from the date  hereof  on the  unpaid  principal  balance  as
         follows:

                  The principal  amount available to be borrowed under this Note
         (the "Maximum  Amount") shall be  automatically  reduced by $140,740.31
         each month,  and at no time shall the outstanding  principal exceed the
         Maximum Amount.  The principal sum hereof  outstanding shall be due and
         payable  on the end of the  "Term"  as  defined  in the Loan  Agreement
         described herein.

                  Interest  shall be earned at the rate (the  "Annual  Rate") of
         one-half  percent  (.50%) per annum plus the "Prime  Rate".  The "Prime
         Rate" is the per annum rate of  interest  publicly  announced  by Chase
         Manhattan  Bank,  New York,  New York,  or the  applicable  rate of its
         successors  or assigns,  from time to time as its prime rate (the prime
         rate is not intended to be the lowest rate of interest charged by Chase
         Manhattan  Bank, New York,  New York, or its successors or assigns,  to
         its  borrowers).  Such interest shall be payable  monthly in arrears on
         the first day of each and every month,  commencing  on the first day of
         the  month  after  an  advance  is made  hereunder.  Interest  shall be
         computed on the unpaid  principal  balance and shall be calculated on a
         year of 360 days for actual days  elapsed.  Interest and  principal not
         paid when due shall bear  interest at a rate equal to two percent  (2%)
         per annum in excess of the Annual Rate."

The remaining provisions of the WellTech Note are unchanged.

         Section 3.03.     Amendments to Yale Note.  The first three (3) 
paragraphs of the Yale Note
are hereby amended in their entirety to read as follows:

FINS2DAL:40474.4  18739-00020
                                                        -9-





                  "FOR VALUE RECEIVED,  YALE E. KEY, INC., a Texas  corporation,
         promises  to pay to the  order of THE CIT  GROUP/CREDIT  FINANCE,  INC.
         ("CIT"), at its offices at 10 South LaSalle Street,  Chicago,  Illinois
         60603 or such other  place as the  holder  hereof may from time to time
         designate in writing,  in legal tender of the United States of America,
         the principal sum of Eight Million Nine Hundred Thirty-Two Thousand Two
         Hundred  Thirty-One  and  21/100  Dollars  ($8,932,231.21)  or so  much
         thereof as may be borrowed  hereunder  and  reflected  on Schedule  "A"
         attached  hereto and made a part hereof,  plus  interest  from the date
         hereof on the unpaid principal balance as follows:

                  The principal  amount available to be borrowed under this Note
         (the "Maximum  Amount") shall be  automatically  reduced by $119,096.21
         each month,  and at no time shall the outstanding  principal exceed the
         Maximum Amount.  The principal sum hereof  outstanding shall be due and
         payable  on the end of the  "Term"  as  defined  in the Loan  Agreement
         described herein.

                  Interest  shall be earned at the rate (the  "Annual  Rate") of
         one-half  percent  (.50%) per annum plus the "Prime  Rate".  The "Prime
         Rate" is the per annum rate of  interest  publicly  announced  by Chase
         Manhattan  Bank,  New York,  New York,  or the  applicable  rate of its
         successors  or assigns,  from time to time as its prime rate (the prime
         rate is not intended to be the lowest rate of interest charged by Chase
         Manhattan  Bank, New York,  New York, or its successors or assigns,  to
         its  borrowers).  Such interest shall be payable  monthly in arrears on
         the first day of each and every month,  commencing  on the first day of
         the  month  after  an  advance  is made  hereunder.  Interest  shall be
         computed on the unpaid  principal  balance and shall be calculated on a
         year of 360 days for actual days  elapsed.  Interest and  principal not
         paid when due shall bear  interest at a rate equal to two percent  (2%)
         per annum in excess of the Annual Rate."

The remaining provisions of the Yale Note are unchanged.

                                                    ARTICLE IV

                                   Ratifications, Representations and Warranties

         Section 4.01. Ratifications. The terms and provisions set forth in this
Amendment shall modify and supersede all  inconsistent  terms and provisions set
forth in the Agreement and, except as expressly  modified and superseded by this
Amendment,  the  terms  and  provisions  of the  Agreement,  including,  without
limitation,   all  financial  covenants  contained  therein,  are  ratified  and
confirmed and shall continue in full force and effect.  Lender and each Borrower
agree that the Agreement as amended  hereby shall  continue to be legal,  valid,
binding and enforceable in accordance with its terms.

         Section 4.02.  Representations  and  Warranties.  Each Borrower  hereby
represents and warrants to Lender that the execution,  delivery and  performance
of this Amendment and all other loan,  amendment or security  documents to which
such  Borrower  is or  is  to be a  party  hereunder  (hereinafter  referred  to
collectively as the "Loan Documents") executed and/or delivered in

FINS2DAL:40474.4  18739-00020
                                                       -10-





connection  herewith,  have been authorized by all requisite corporate action on
the part of such Borrower and will not violate the Articles of  Incorporation or
Bylaws of such Borrower.

                                                     ARTICLE V

                                               Conditions Precedent

         Section 5.01.     Conditions.  The effectiveness of this Amendment is 
subject to the satisfaction of the following conditions precedent (unless 
specifically waived in writing by the Lender):

                  (a) Lender shall have received, in addition to this Amendment,
         all of the following, each dated (unless otherwise indicated) as of the
         date of this Amendment, in form and substance satisfactory to Lender in
         its sole discretion:

                         (i) Company Certificate.  A certificate executed by the
                  Secretary or Assistant  Secretary of each Borrower  certifying
                  (A) that  Borrower's  Board of Directors  has met and adopted,
                  approved,  consented to and ratified the resolutions  attached
                  thereto   which   authorize   the   execution,   delivery  and
                  performance   by  Borrower  of  the  Amendment  and  the  Loan
                  Documents,   (B)  the  names  of  the   officers  of  Borrower
                  authorized  to  sign  this  Amendment  and  each  of the  Loan
                  Documents to which  Borrower is to be a party  hereunder,  (C)
                  the specimen signatures of such officers, and (D) that neither
                  the Articles of Incorporation nor Bylaws of Borrower have been
                  amended since the date of the Agreement;

                        (ii)        Evidence of Existence and Good Standing.  
                  Evidence of the existence
                  and good standing of each Borrower in such jurisdictions as 
                  Lender may require;

                       (iii) No Material  Adverse  Change.  Since May 21,  1996,
                  there shall have  occurred no material  adverse  change in the
                  business,   operations,   financial   condition,   profits  or
                  prospects  of any  Borrower,  or in the  Collateral,  and  the
                  Lender shall have  received a certificate  of each  Borrower's
                  chief executive officer to such effect;

                        (iv)        Amendment Documents.

                                    a. The  Amended  and  Restated  Intercompany
                           Note and  Security  Agreement  executed by  Servicios
                           payable to WellTech in the original  principal amount
                           of up to $5,400,000 dated November 22, 1996.

                                    b. The Deed of Trust  executed  by  WellTech
                           dated  November  22,  1996 for the  benefit of Lender
                           covering certain property located in Woodward County,
                           Oklahoma.

                                    c.      The Amendment to Common Stock 
                           Purchase Warrant.


FINS2DAL:40474.4  18739-00020
                                                       -11-





     d.  Warrant No. 2 - Common  Stock  Purchase  Warrant  executed by Parent in
favor of Lender for 125,000 shares of Parent's stock dated November 22, 1996..
                                   
     e.  Amended and Restated Registration Rights Agreement.

     f.  Certificates  of title for certain motor  vehicles  with  documentation
acceptable to Lender for recording Lender's liens thereon.
                                   
     g.  UCC-1 Financing Statements for each of Borrower's
         locations reflecting Lender's security interest.

         (v) Other Documents.  Each Borrower shall have executed and delivered
             such other documents and instruments as well as required record 
             searches as Lender may require.

                  (b) All corporate  proceedings  taken in  connection  with the
         transactions   contemplated   by  this  Amendment  and  all  documents,
         instruments  and  other  legal  matters   incident   thereto  shall  be
         satisfactory  to Lender and its legal counsel,  Jenkens & Gilchrist,  a
         Professional Corporation.

                  (c)  The  Indenture   shall  have  been  amended  to  Lender's
         satisfaction  to reflect  that  Parent's  obligations  under the Parent
         Guaranty constitute "Senior Indebtedness" under the Indenture.

                                                    ARTICLE VI

                                                   Miscellaneous

         Section  6.01.   Survival  of  Representations   and  Warranties.   All
representations  and  warranties  made in the Agreement or any other document or
documents relating thereto,  including,  without  limitation,  any Loan Document
furnished in  connection  with this  Amendment,  shall survive the execution and
delivery of this Amendment and the other Loan Documents, and no investigation by
Lender or any closing  shall affect the  representations  and  warranties or the
right of Lender to rely thereon.

         Section 6.02. Reference to Agreement.  The Agreement,  each of the Loan
Documents,  and any and all other  agreements,  documents or instruments  now or
hereafter executed and delivered pursuant to the terms hereof or pursuant to the
terms of the  Agreement  as  amended  hereby,  are  hereby  amended  so that any
reference  therein to the  Agreement  shall mean a reference to the Agreement as
amended hereby.

     Section 6.03. Severability. Any provision of this Amendment held by a court
of competent  jurisdiction  to be invalid or  unenforceable  shall not impair or
invalidate the remainder of this

FINS2DAL:40474.4  18739-00020
                                                       -12-





Amendment  and the effect  thereof shall be confined to the provision so held to
be invalid or unenforceable.

         Section 6.04.     APPLICABLE LAW.  THIS AMENDMENT AND ALL OTHER LOAN
DOCUMENTS EXECUTED PURSUANT HERETO SHALL BE DEEMED TO HAVE BEEN
MADE AND TO BE PERFORMABLE IN THE STATE OF ILLINOIS AND SHALL BE
GOVERNED BY AND CONSTRUED IN ACCORDANCE WITH THE LAWS OF THE
STATE OF ILLINOIS.

         Section 6.05.  Successors  and Assigns.  This Amendment is binding upon
and shall inure to the benefit of Lender and each Borrower and their  respective
successors  and  assigns;  provided,  however,  that no  Borrower  may assign or
transfer any of its rights or  obligations  hereunder  without the prior written
consent  of Lender.  Lender  may assign any or all of its rights or  obligations
hereunder without the prior consent of any Borrower.

     Section 6.06.  Counterparts.  This Amendment may be executed in one or more
counterparts,  each of which when so executed shall be deemed to be an original,
but all of  which  when  taken  together  shall  constitute  one  and  the  same
instrument.

         Section  6.07.  Effect of Waiver.  No  consent  or  waiver,  express or
implied,  by Lender to or of any breach of or  deviation  from any  covenant  or
condition of the  Agreement or duty shall be deemed a consent or waiver to or of
any other breach of or deviation from the same or any other covenant,  condition
or  duty.  No  failure  on the  part of  Lender  to  exercise  and no  delay  in
exercising,  and no course of dealing  with  respect  to, any right,  power,  or
privilege under this  Amendment,  the Agreement or any other Loan Document shall
operate as a waiver  thereof,  nor shall any single or partial  exercise  of any
right, power, or privilege under this Amendment, the Agreement or any other Loan
Document  preclude any other or further  exercise thereof or the exercise of any
other right,  power, or privilege.  The rights and remedies  provided for in the
Agreement and the other Loan  Documents are  cumulative and not exclusive of any
rights and remedies provided by law.

     Section 6.08.  Headings.  The headings,  captions and arrangements  used in
this Amendment are for convenience only and shall not affect the  interpretation
of this Amendment.

         Section  6.09.  Releases.  As a material  inducement to Lender to enter
into this Amendment, each Borrower hereby represents and warrants that there are
no claims or offsets  against,  or defenses or  counterclaims  to, the terms and
provisions of and the other obligations created or evidenced by the Agreement or
the other Loan Documents.  Each Borrower hereby releases,  acquits,  and forever
discharges  Lender, and its successors,  assigns,  and predecessors in interest,
their  parents,  subsidiaries  and affiliated  organizations,  and the officers,
employees,  attorneys,  and  agents  of each of the  foregoing  (all of whom are
herein jointly and severally referred to as the "Released Parties") from any and
all liability,  damages, losses,  obligations,  costs, expenses,  suits, claims,
demands,  causes of action for damages or any other  relief,  whether or not now
known or suspected,  of any kind,  nature,  or  character,  at law or in equity,
which such  Borrower  now has or may have ever had against  any of the  Released
Parties, including, but not limited to, those relating to (a) usury or penalties
or damages therefor, (b) allegations that a partnership existed between Borrower
and the Released  Parties,  (c) allegations of  unconscionable  acts,  deceptive
trade practices, lack of good faith or fair dealing, lack

FINS2DAL:40474.4  18739-00020
                                                       -13-





of commercial reasonableness or special relationships,  such as fiduciary, trust
or confidential relationships,  (d) allegations of dominion, control, alter ego,
instrumentality,  fraud,  misrepresentation,  duress, coercion, undue influence,
interference  or  negligence,  (e)  allegations  of tortious  interference  with
present or prospective business  relationships or of antitrust,  or (f) slander,
libel or damage to reputation,  (hereinafter being  collectively  referred to as
the "Claims"), all of which Claims are hereby waived.

         Section 6.10. Expenses of Lender.  Borrowers agree to pay on demand (i)
all costs and  expenses  reasonably  incurred by Lender in  connection  with the
preparation,  negotiation  and  execution of this  Amendment  and the other Loan
Documents  executed  pursuant  hereto  and any and  all  subsequent  amendments,
modifications, and supplements hereto or thereto, including, without limitation,
the costs and fees of Lender's  legal  counsel and the  allocated  cost of staff
counsel  and (ii) all  costs  and  expenses  reasonably  incurred  by  Lender in
connection  with  the  enforcement  or  preservation  of any  rights  under  the
Agreement,  this  Amendment  and/or  other Loan  Documents,  including,  without
limitation,  the costs and fees of Lender's legal counsel and the allocated cost
of staff counsel.

         Section 6.11.     NO ORAL AGREEMENTS.  THIS AMENDMENT, TOGETHER WITH
THE OTHER LOAN  DOCUMENTS AS WRITTEN,  REPRESENT  THE FINAL  AGREEMENTS  BETWEEN
LENDER  AND  BORROWERS  AND  MAY  NOT BE  CONTRADICTED  BY  EVIDENCE  OF  PRIOR,
CONTEMPORANEOUS  OR  SUBSEQUENT  ORAL  AGREEMENTS  OF THE PARTIES.  THERE ARE NO
UNWRITTEN ORAL AGREEMENTS BETWEEN LENDER AND BORROWERS.



FINS2DAL:40474.4  18739-00020
                                                       -14-





         IN WITNESS  WHEREOF,  the parties have executed this First Amendment to
Third Amended and Restated  Loan and Security  Agreement on the date first above
written.

"BORROWERS"

YALE E. KEY, INC.



By:
Name: Francis D. John
Title: Executive Vice President

KEY ENERGY DRILLING, INC.
(d/b/a Clint Hurt Drilling)



By:
Name: Francis D. John
Title: Executive Vice President

WELLTECH EASTERN, INC.



By:
Name: Francis D. John
Title: President


"LENDER"

THE CIT GROUP/CREDIT FINANCE, INC.



By:
Name: Morris Horstmann
Title: Vice President

FINS2DAL:40474.4  18739-00020
                                                       S - 1





                                            CONSENTS AND REAFFIRMATIONS

         Key Energy  Group,  Inc.  hereby  acknowledges  the  execution  of, and
consents to, the terms and  conditions of that First  Amendment to Third Amended
and Restated Loan and Security  Agreement dated as of November 22, 1996, between
Yale E. Key,  Inc.,  Key Energy  Drilling,  Inc.  (d/b/a  Clint Hurt  Drilling),
WellTech Eastern, Inc. and The CIT Group/Credit Finance, Inc.,  ("Creditor") and
reaffirms its obligations under (i) that certain Guaranty (the "Guaranty") dated
as of May 21, 1996 made by the  undersigned  in favor of the Creditor,  and (ii)
that certain Amended and Restated Stock Pledge Agreement (the "Pledge") dated as
of May  21,  1996  made  by the  undersigned  in  favor  of  the  Creditor,  and
acknowledges and agrees that the Guaranty and the Pledge and all other documents
executed  in  connection  therewith  remain  in full  force and  effect  and the
Guaranty  and the Pledge and all such other  documents  are hereby  ratified and
confirmed.

         Dated as of November 22, 1996.

KEY ENERGY GROUP, INC.


By:
Name: Francis D. John
Title:



FINS2DAL:40474.4  18739-00020




                                               AMENDED SCHEDULE 6.12


     1.Key has  guaranteed  the  obligations  of Odessa to Norwest  Bank  Texas,
Midland.

     2.Key  will pay the  bonuses  due to  Francis  D.  John  under  Mr.  John's
Employment Agreement with Key.

     3.  Key  will  guarantee  WellTech's  obligations  relating  to  the  Nub's
acquisition and note balance: $200,000 - $250,000

     4. WellTech leases from Hidco  Development  Corporation,  which is owned by
Kenneth C. Hill and his spouse,  real property used for well servicing  yards in
Mt. Pleasant,  Michigan and Ripley, West Virginia. Lease terms, including rental
rates, are deemed by management to be competitive.

5.       WellTech leases from Talon  Development  Corporation real property used
         for its servicing yard in Indiana, Pennsylvania. Kenneth C. Hill owns a
         33 1/3 interest in Talon Development Corporation. Lease terms including
         rental rates are deemed by management to be competitive.

6.       WellTech  initiated  a  management  incentive  compensation  plan which
         requires  the  payment of sums of money to various  parties  contingent
         upon the attainment of a stipulated level of profitability. No payments
         have been made pursuant to this plan since its adoption.

7.       Provided  no Event of Default  has  occurred  or would  result from the
         making of such distributions, each Borrower may distribute funds to Key
         in an amount  sufficient in the aggregate to make  regularly  scheduled
         payments of interest under the Indenture.

8.       Each of the Borrowers may guarantee the obligations of Parent under the
         Indenture  and  the  Debentures   and  may  guarantee   obligations  of
         subsidiaries of Parent incurred in the ordinary course of business.


FINS2DAL:40474.4  18739-00020