CORE LABORATORIES N V
SC 13D, 1998-07-30
TESTING LABORATORIES
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<PAGE>   1
                       SECURITIES AND EXCHANGE COMMISSION

                             WASHINGTON, D.C. 20549

                                  SCHEDULE 13D

                    Under the Securities Exchange Act of 1934


                             Core Laboratories N.V.
                       ----------------------------------
                                (Name of Issuer)

                   Common Stock, par value NLG 0.03 per share
           ---------------------------------------------------------
                         (Title of Class of Securities)

                                   N22717 10 7
                               -----------------
                                 (CUSIP Number)

                                H. Dean Owen, Jr.
                                 8900 Forum Way
                             Fort Worth, Texas 76140
                                 (817) 551-0540
         ---------------------------------------------------------------
           (Name, Address and Telephone Number of Person Authorized to
                       Receive Notices and Communications)

                                  June 30, 1998
                               ------------------
             (Date of Event which Requires Filing of this Statement)

If the filing person has previously filed a statement on Schedule 13G to report
the acquisition that is the subject of this Schedule 13D, and is filing this
schedule because of Rule 13d-1(b)(4)(i)(A) or (B), check the following box. [ ]

Check the following box if a fee is being paid with this statement [ X ]. (A fee
is not required only if the reporting person: (1) has a previous statement on
file reporting beneficial ownership of more than five percent of the class of
securities described in Item 1; and (2) has filed no amendment subsequent
thereto reporting beneficial ownership of less than five percent of such class.
See Rule 13d-7.)

Note: Six copies of this statement, including all exhibits, should be filed with
the Commission. See Rule 13d-1(a) for other parties to whom copies are to be
sent.

The remainder of this cover page shall be filled out for a reporting person's
initial filing on this form with respect to the subject class of securities, and
for any subsequent amendment containing information which would alter
disclosures provided in a prior cover page.

The information required on the remainder of this cover page shall not be deemed
to be "filed" for the purpose of Section 18 of the Securities Exchange Act of
1934 ("Act") or otherwise subject to the liabilities of that section of the Act
but shall be subject to all other provisions of the Act (however, see the
Notes).


<PAGE>   2
CUSIP No. N22717 10 7 

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

1)   Names of Reporting Persons:     Harrold D. Owen
    
- --------------------------------------------------------------------------------
2)   Check the Appropriate Box if a Member of a Group (See Instructions)
     (a) [X]
     (b) 

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

3)   SEC Use Only

- --------------------------------------------------------------------------------
4)   Source of Funds (See Instructions)     PF

- --------------------------------------------------------------------------------
5)   Check If Disclosure Of Legal Proceedings is Required Pursuant 
     to Items 2(d) or 2(e)
                    
- --------------------------------------------------------------------------------
6)   Citizenship or Place of Organization:             USA    

- --------------------------------------------------------------------------------
                  (7)   Sole Voting Power:.            682,912       
    Number of
   Shares Bene-   --------------------------------------------------------------
    ficially      (8)   Shared Voting Power:           None  
  Owned by Each                                                                 
    Reporting     --------------------------------------------------------------
   Person With    (9)   Sole Dispositive Power:        682,912                

                  --------------------------------------------------------------
                  (10)   Shared Dispositive Power:     None  
     
- --------------------------------------------------------------------------------
11)  Aggregate Amount Beneficially Owned by Each Reporting Person:
             682,912
     
- --------------------------------------------------------------------------------
12)  Check if the Aggregate Amount in Row (11) Excludes 
     Certain Shares (See Instructions)

- --------------------------------------------------------------------------------
13)  Percent of Class Represented by Amount in Row (11):    2.5%

     
- --------------------------------------------------------------------------------
14)  Type of Reporting Person (See Instructions)       IN

<PAGE>   3
CUSIP No. N22717 10 7 

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

1)   Names of Reporting Persons:     Betty Jo Owen
    
- --------------------------------------------------------------------------------
2)   Check the Appropriate Box if a Member of a Group (See Instructions)
     (a) [X]
     (b) 

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

3)   SEC Use Only

- --------------------------------------------------------------------------------
4)   Source of Funds (See Instructions)     PF

- --------------------------------------------------------------------------------
5)   Check If Disclosure Of Legal Proceedings is Required Pursuant 
     to Items 2(d) or 2(e)
                    
- --------------------------------------------------------------------------------
6)   Citizenship or Place of Organization:              USA    

- --------------------------------------------------------------------------------
                  (7)   Sole Voting Power:.            682,912
    Number of
   Shares Bene-   --------------------------------------------------------------
    ficially      (8)   Shared Voting Power:           None
  Owned by Each                                                                 
    Reporting     --------------------------------------------------------------
   Person With    (9)   Sole Dispositive Power:        682,912                  

                  --------------------------------------------------------------
                  (10)   Shared Dispositive Power:     None
     
- --------------------------------------------------------------------------------
11)  Aggregate Amount Beneficially Owned by Each Reporting Person:
             682,912
     
- --------------------------------------------------------------------------------
12)  Check if the Aggregate Amount in Row (11) Excludes 
     Certain Shares (See Instructions)

- --------------------------------------------------------------------------------
13)  Percent of Class Represented by Amount in Row (11):     2.5%

     
- --------------------------------------------------------------------------------
14)  Type of Reporting Person (See Instructions)       IN

<PAGE>   4
CUSIP No. N22717 10 7 

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

1)   Names of Reporting Persons:     H. Dean Owen, Jr.
    
- --------------------------------------------------------------------------------
2)   Check the Appropriate Box if a Member of a Group (See Instructions)
     (a) [X]
     (b) 

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

3)   SEC Use Only

- --------------------------------------------------------------------------------
4)   Source of Funds (See Instructions)     PF

- --------------------------------------------------------------------------------
5)   Check If Disclosure Of Legal Proceedings is Required Pursuant 
     to Items 2(d) or 2(e)
                    
- --------------------------------------------------------------------------------
6)   Citizenship or Place of Organization:             USA    

- --------------------------------------------------------------------------------
                  (7)   Sole Voting Power:.            244,483
    Number of
   Shares Bene-   --------------------------------------------------------------
    ficially      (8)   Shared Voting Power:           None
  Owned by Each                                                                 
    Reporting     --------------------------------------------------------------
   Person With    (9)   Sole Dispositive Power:        244,483                  

                  --------------------------------------------------------------
                  (10)   Shared Dispositive Power:     None 
     
- --------------------------------------------------------------------------------
11)  Aggregate Amount Beneficially Owned by Each Reporting Person:
             244,483
     
- --------------------------------------------------------------------------------
12)  Check if the Aggregate Amount in Row (11) Excludes 
     Certain Shares (See Instructions)

- --------------------------------------------------------------------------------
13)  Percent of Class Represented by Amount in Row (11):     0.9%

     
- --------------------------------------------------------------------------------
14)  Type of Reporting Person (See Instructions)       IN

<PAGE>   5
CUSIP No. N22717 10 7 

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

1)   Names of Reporting Persons:     Brooke Owen Goff
    
- --------------------------------------------------------------------------------
2)   Check the Appropriate Box if a Member of a Group (See Instructions)
     (a) [X]
     (b) 

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

3)   SEC Use Only

- --------------------------------------------------------------------------------
4)   Source of Funds (See Instructions)     PF

- --------------------------------------------------------------------------------
5)   Check If Disclosure Of Legal Proceedings is Required Pursuant 
     to Items 2(d) or 2(e)
                    
- --------------------------------------------------------------------------------
6)   Citizenship or Place of Organization:             USA    

- --------------------------------------------------------------------------------
                  (7)   Sole Voting Power:.            39,609
    Number of
   Shares Bene-   --------------------------------------------------------------
    ficially      (8)   Shared Voting Power:           42,341
  Owned by Each                                                                 
    Reporting     --------------------------------------------------------------
   Person With    (9)   Sole Dispositive Power:        39,609                  

                  --------------------------------------------------------------
                  (10)   Shared Dispositive Power:     42,341
     
- --------------------------------------------------------------------------------
11)  Aggregate Amount Beneficially Owned by Each Reporting Person:
             39,609
     
- --------------------------------------------------------------------------------
12)  Check if the Aggregate Amount in Row (11) Excludes 
     Certain Shares (See Instructions) X

- --------------------------------------------------------------------------------
13)  Percent of Class Represented by Amount in Row (11):  less than 0.1%

     
- --------------------------------------------------------------------------------
14)  Type of Reporting Person (See Instructions)       IN

<PAGE>   6
CUSIP No. N22717 10 7 

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

1)   Names of Reporting Persons:     Jerrod Mitchell Goff
    
- --------------------------------------------------------------------------------
2)   Check the Appropriate Box if a Member of a Group (See Instructions)
     (a) [X]
     (b) 

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

3)   SEC Use Only

- --------------------------------------------------------------------------------
4)   Source of Funds (See Instructions)     PF

- --------------------------------------------------------------------------------
5)   Check If Disclosure Of Legal Proceedings is Required Pursuant 
     to Items 2(d) or 2(e)
                    
- --------------------------------------------------------------------------------
6)   Citizenship or Place of Organization:             USA    

- --------------------------------------------------------------------------------
                  (7)   Sole Voting Power:.            None
    Number of
   Shares Bene-   --------------------------------------------------------------
    ficially      (8)   Shared Voting Power:           1,366
  Owned by Each                                                                 
    Reporting     --------------------------------------------------------------
   Person With    (9)   Sole Dispositive Power:        None                     

                  --------------------------------------------------------------
                  (10)   Shared Dispositive Power:     1,366
     
- --------------------------------------------------------------------------------
11)  Aggregate Amount Beneficially Owned by Each Reporting Person:
             1,366  
     
- --------------------------------------------------------------------------------
12)  Check if the Aggregate Amount in Row (11) Excludes 
     Certain Shares (See Instructions)

- --------------------------------------------------------------------------------
13)  Percent of Class Represented by Amount in Row (11): less than 0.1%

     
- --------------------------------------------------------------------------------
14)  Type of Reporting Person (See Instructions)       IN

<PAGE>   7
CUSIP No. N22717 10 7 

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

1)   Names of Reporting Persons:     Marilyn Kate Goff
    
- --------------------------------------------------------------------------------
2)   Check the Appropriate Box if a Member of a Group (See Instructions)
     (a) [X]
     (b) 

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

3)   SEC Use Only

- --------------------------------------------------------------------------------
4)   Source of Funds (See Instructions)     PF

- --------------------------------------------------------------------------------
5)   Check If Disclosure Of Legal Proceedings is Required Pursuant 
     to Items 2(d) or 2(e)
                    
- --------------------------------------------------------------------------------
6)   Citizenship or Place of Organization:             USA    

- --------------------------------------------------------------------------------
                  (7)   Sole Voting Power:.            None
    Number of
   Shares Bene-   --------------------------------------------------------------
    ficially      (8)   Shared Voting Power:           1,366       
  Owned by Each                                                                 
    Reporting     --------------------------------------------------------------
   Person With    (9)   Sole Dispositive Power:        None                    

                  --------------------------------------------------------------
                  (10)   Shared Dispositive Power:     1,366       
     
- --------------------------------------------------------------------------------
11)  Aggregate Amount Beneficially Owned by Each Reporting Person:
             1,366 
     
- --------------------------------------------------------------------------------
12)  Check if the Aggregate Amount in Row (11) Excludes 
     Certain Shares (See Instructions)  

- --------------------------------------------------------------------------------
13)  Percent of Class Represented by Amount in Row (11):  less than 0.1%

     
- --------------------------------------------------------------------------------
14)  Type of Reporting Person (See Instructions)       IN

<PAGE>   8
CUSIP No. N22717 10 7 

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

1)   Names of Reporting Persons:     H.D. Owen, III
    
- --------------------------------------------------------------------------------
2)   Check the Appropriate Box if a Member of a Group (See Instructions)
     (a) [X]
     (b) 

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

3)   SEC Use Only

- --------------------------------------------------------------------------------
4)   Source of Funds (See Instructions)     PF

- --------------------------------------------------------------------------------
5)   Check If Disclosure Of Legal Proceedings is Required Pursuant 
     to Items 2(d) or 2(e)
                    
- --------------------------------------------------------------------------------
6)   Citizenship or Place of Organization:             USA    

- --------------------------------------------------------------------------------
                  (7)   Sole Voting Power:.            39,609
    Number of
   Shares Bene-   --------------------------------------------------------------
    ficially      (8)   Shared Voting Power:           None 
  Owned by Each                                                                 
    Reporting     --------------------------------------------------------------
   Person With    (9)   Sole Dispositive Power:        39,609                   

                  --------------------------------------------------------------
                  (10)   Shared Dispositive Power:     None 
     
- --------------------------------------------------------------------------------
11)  Aggregate Amount Beneficially Owned by Each Reporting Person:
             39,609 
     
- --------------------------------------------------------------------------------
12)  Check if the Aggregate Amount in Row (11) Excludes 
     Certain Shares (See Instructions)

- --------------------------------------------------------------------------------
13)  Percent of Class Represented by Amount in Row (11): less than 0.1%

     
- --------------------------------------------------------------------------------
14)  Type of Reporting Person (See Instructions)       IN

<PAGE>   9
CUSIP No. N22717 10 7 

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

1)   Names of Reporting Persons:     Bryann A. Owen
    
- --------------------------------------------------------------------------------
2)   Check the Appropriate Box if a Member of a Group (See Instructions)
     (a) [X]
     (b) 

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

3)   SEC Use Only

- --------------------------------------------------------------------------------
4)   Source of Funds (See Instructions)     PF

- --------------------------------------------------------------------------------
5)   Check If Disclosure Of Legal Proceedings is Required Pursuant 
     to Items 2(d) or 2(e)
                    
- --------------------------------------------------------------------------------
6)   Citizenship or Place of Organization:             USA    

- --------------------------------------------------------------------------------
                  (7)   Sole Voting Power:.            39,609    
    Number of
   Shares Bene-   --------------------------------------------------------------
    ficially      (8)   Shared Voting Power:           None        
  Owned by Each                                                                 
    Reporting     --------------------------------------------------------------
   Person With    (9)   Sole Dispositive Power:        39,609                  

                  --------------------------------------------------------------
                  (10)   Shared Dispositive Power:     None        
     
- --------------------------------------------------------------------------------
11)  Aggregate Amount Beneficially Owned by Each Reporting Person:
             39,609
     
- --------------------------------------------------------------------------------
12)  Check if the Aggregate Amount in Row (11) Excludes 
     Certain Shares (See Instructions)  

- --------------------------------------------------------------------------------
13)  Percent of Class Represented by Amount in Row (11):  less than 0.1%

     
- --------------------------------------------------------------------------------
14)  Type of Reporting Person (See Instructions)       IN

<PAGE>   10
CUSIP No. N22717 10 7 

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

1)   Names of Reporting Persons:     Bria J. Owen
    
- --------------------------------------------------------------------------------
2)   Check the Appropriate Box if a Member of a Group (See Instructions)
     (a) [X]
     (b) 

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

3)   SEC Use Only

- --------------------------------------------------------------------------------
4)   Source of Funds (See Instructions)     PF

- --------------------------------------------------------------------------------
5)   Check If Disclosure Of Legal Proceedings is Required Pursuant 
     to Items 2(d) or 2(e)
                    
- --------------------------------------------------------------------------------
6)   Citizenship or Place of Organization:             USA    

- --------------------------------------------------------------------------------
                  (7)   Sole Voting Power:.            None       
    Number of
   Shares Bene-   --------------------------------------------------------------
    ficially      (8)   Shared Voting Power:           39,609
  Owned by Each                                                                 
    Reporting     --------------------------------------------------------------
   Person With    (9)   Sole Dispositive Power:        None                   

                  --------------------------------------------------------------
                  (10)   Shared Dispositive Power:     39,609
     
- --------------------------------------------------------------------------------
11)  Aggregate Amount Beneficially Owned by Each Reporting Person:
             39,609 
     
- --------------------------------------------------------------------------------
12)  Check if the Aggregate Amount in Row (11) Excludes 
     Certain Shares (See Instructions)

- --------------------------------------------------------------------------------
13)  Percent of Class Represented by Amount in Row (11): less than 0.1%

     
- --------------------------------------------------------------------------------
14)  Type of Reporting Person (See Instructions)       IN

<PAGE>   11
CUSIP No. N22717 10 7 

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

1)   Names of Reporting Persons:     Sharron Drury
    
- --------------------------------------------------------------------------------
2)   Check the Appropriate Box if a Member of a Group (See Instructions)
     (a) [X]
     (b) 

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

3)   SEC Use Only

- --------------------------------------------------------------------------------
4)   Source of Funds (See Instructions)     PF

- --------------------------------------------------------------------------------
5)   Check If Disclosure Of Legal Proceedings is Required Pursuant 
     to Items 2(d) or 2(e)
                    
- --------------------------------------------------------------------------------
6)   Citizenship or Place of Organization:             USA    

- --------------------------------------------------------------------------------
                  (7)   Sole Voting Power:.            39,609    
    Number of
   Shares Bene-   --------------------------------------------------------------
    ficially      (8)   Shared Voting Power:           None        
  Owned by Each                                                                 
    Reporting     --------------------------------------------------------------
   Person With    (9)   Sole Dispositive Power:        39,609                  

                  --------------------------------------------------------------
                  (10)   Shared Dispositive Power:     None        
     
- --------------------------------------------------------------------------------
11)  Aggregate Amount Beneficially Owned by Each Reporting Person:
             39,609
     
- --------------------------------------------------------------------------------
12)  Check if the Aggregate Amount in Row (11) Excludes 
     Certain Shares (See Instructions)  

- --------------------------------------------------------------------------------
13)  Percent of Class Represented by Amount in Row (11):  less than 0.1%

     
- --------------------------------------------------------------------------------
14)  Type of Reporting Person (See Instructions)       IN

<PAGE>   12
CUSIP No. N22717 10 7 

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

1)   Names of Reporting Persons:     Derrek D. Drury
    
- --------------------------------------------------------------------------------
2)   Check the Appropriate Box if a Member of a Group (See Instructions)
     (a) [X]
     (b) 

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

3)   SEC Use Only

- --------------------------------------------------------------------------------
4)   Source of Funds (See Instructions)     PF

- --------------------------------------------------------------------------------
5)   Check If Disclosure Of Legal Proceedings is Required Pursuant 
     to Items 2(d) or 2(e)
                    
- --------------------------------------------------------------------------------
6)   Citizenship or Place of Organization:             USA    

- --------------------------------------------------------------------------------
                  (7)   Sole Voting Power:.            39,609       
    Number of
   Shares Bene-   --------------------------------------------------------------
    ficially      (8)   Shared Voting Power:           None  
  Owned by Each                                                                 
    Reporting     --------------------------------------------------------------
   Person With    (9)   Sole Dispositive Power:        39,609                 

                  --------------------------------------------------------------
                  (10)   Shared Dispositive Power:     None  
     
- --------------------------------------------------------------------------------
11)  Aggregate Amount Beneficially Owned by Each Reporting Person:
             39,609 
     
- --------------------------------------------------------------------------------
12)  Check if the Aggregate Amount in Row (11) Excludes 
     Certain Shares (See Instructions)

- --------------------------------------------------------------------------------
13)  Percent of Class Represented by Amount in Row (11): less than 0.1%

     
- --------------------------------------------------------------------------------
14)  Type of Reporting Person (See Instructions)       IN

<PAGE>   13
CUSIP No. N22717 10 7 

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

1)   Names of Reporting Persons:     Daley B. Drury
    
- --------------------------------------------------------------------------------
2)   Check the Appropriate Box if a Member of a Group (See Instructions)
     (a) [X]
     (b) 

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

3)   SEC Use Only

- --------------------------------------------------------------------------------
4)   Source of Funds (See Instructions)     PF

- --------------------------------------------------------------------------------
5)   Check If Disclosure Of Legal Proceedings is Required Pursuant 
     to Items 2(d) or 2(e)
                    
- --------------------------------------------------------------------------------
6)   Citizenship or Place of Organization:             USA    

- --------------------------------------------------------------------------------
                  (7)   Sole Voting Power:.            39,609    
    Number of
   Shares Bene-   --------------------------------------------------------------
    ficially      (8)   Shared Voting Power:           None        
  Owned by Each                                                                 
    Reporting     --------------------------------------------------------------
   Person With    (9)   Sole Dispositive Power:        39,609                  

                  --------------------------------------------------------------
                  (10)   Shared Dispositive Power:     None        
     
- --------------------------------------------------------------------------------
11)  Aggregate Amount Beneficially Owned by Each Reporting Person:
             39,609
     
- --------------------------------------------------------------------------------
12)  Check if the Aggregate Amount in Row (11) Excludes 
     Certain Shares (See Instructions)  

- --------------------------------------------------------------------------------
13)  Percent of Class Represented by Amount in Row (11):  less than 0.1%

     
- --------------------------------------------------------------------------------
14)  Type of Reporting Person (See Instructions)       IN

<PAGE>   14
CUSIP No. N22717 10 7 

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

1)   Names of Reporting Persons:     Sharron Denee' Drury
    
- --------------------------------------------------------------------------------
2)   Check the Appropriate Box if a Member of a Group (See Instructions)
     (a) [X]
     (b) 

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

3)   SEC Use Only

- --------------------------------------------------------------------------------
4)   Source of Funds (See Instructions)     PF

- --------------------------------------------------------------------------------
5)   Check If Disclosure Of Legal Proceedings is Required Pursuant 
     to Items 2(d) or 2(e)
                    
- --------------------------------------------------------------------------------
6)   Citizenship or Place of Organization:             USA    

- --------------------------------------------------------------------------------
                  (7)   Sole Voting Power:.            39,609       
    Number of
   Shares Bene-   --------------------------------------------------------------
    ficially      (8)   Shared Voting Power:           None  
  Owned by Each                                                                 
    Reporting     --------------------------------------------------------------
   Person With    (9)   Sole Dispositive Power:        39,609                 

                  --------------------------------------------------------------
                  (10)   Shared Dispositive Power:     None  
     
- --------------------------------------------------------------------------------
11)  Aggregate Amount Beneficially Owned by Each Reporting Person:
             39,609 
     
- --------------------------------------------------------------------------------
12)  Check if the Aggregate Amount in Row (11) Excludes 
     Certain Shares (See Instructions)

- --------------------------------------------------------------------------------
13)  Percent of Class Represented by Amount in Row (11): less than 0.1%

     
- --------------------------------------------------------------------------------
14)  Type of Reporting Person (See Instructions)       IN

<PAGE>   15
CUSIP No. N22717 10 7 

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

1)   Names of Reporting Persons:     Kimberly Williamson
    
- --------------------------------------------------------------------------------
2)   Check the Appropriate Box if a Member of a Group (See Instructions)
     (a) [X]
     (b) 

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

3)   SEC Use Only

- --------------------------------------------------------------------------------
4)   Source of Funds (See Instructions)     PF

- --------------------------------------------------------------------------------
5)   Check If Disclosure Of Legal Proceedings is Required Pursuant 
     to Items 2(d) or 2(e)
                    
- --------------------------------------------------------------------------------
6)   Citizenship or Place of Organization:             USA    

- --------------------------------------------------------------------------------
                  (7)   Sole Voting Power:.            39,609    
    Number of
   Shares Bene-   --------------------------------------------------------------
    ficially      (8)   Shared Voting Power:           79,218      
  Owned by Each                                                                 
    Reporting     --------------------------------------------------------------
   Person With    (9)   Sole Dispositive Power:        39,609                  

                  --------------------------------------------------------------
                  (10)   Shared Dispositive Power:     79,218      
     
- --------------------------------------------------------------------------------
11)  Aggregate Amount Beneficially Owned by Each Reporting Person:
             39,609
     
- --------------------------------------------------------------------------------
12)  Check if the Aggregate Amount in Row (11) Excludes 
     Certain Shares (See Instructions) X 

- --------------------------------------------------------------------------------
13)  Percent of Class Represented by Amount in Row (11):  less than 0.1%

     
- --------------------------------------------------------------------------------
14)  Type of Reporting Person (See Instructions)       IN

<PAGE>   16
CUSIP No. N22717 10 7 

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

1)   Names of Reporting Persons:     Reif O. Chron
    
- --------------------------------------------------------------------------------
2)   Check the Appropriate Box if a Member of a Group (See Instructions)
     (a) [X]
     (b) 

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

3)   SEC Use Only

- --------------------------------------------------------------------------------
4)   Source of Funds (See Instructions)     PF

- --------------------------------------------------------------------------------
5)   Check If Disclosure Of Legal Proceedings is Required Pursuant 
     to Items 2(d) or 2(e)
                    
- --------------------------------------------------------------------------------
6)   Citizenship or Place of Organization:             USA    

- --------------------------------------------------------------------------------
                  (7)   Sole Voting Power:.            39,609       
    Number of
   Shares Bene-   --------------------------------------------------------------
    ficially      (8)   Shared Voting Power:           None  
  Owned by Each                                                                 
    Reporting     --------------------------------------------------------------
   Person With    (9)   Sole Dispositive Power:        39,609                 

                  --------------------------------------------------------------
                  (10)   Shared Dispositive Power:     None  
     
- --------------------------------------------------------------------------------
11)  Aggregate Amount Beneficially Owned by Each Reporting Person:
             39,609 
     
- --------------------------------------------------------------------------------
12)  Check if the Aggregate Amount in Row (11) Excludes 
     Certain Shares (See Instructions)

- --------------------------------------------------------------------------------
13)  Percent of Class Represented by Amount in Row (11): less than 0.1%

     
- --------------------------------------------------------------------------------
14)  Type of Reporting Person (See Instructions)       IN

<PAGE>   17
CUSIP No. N22717 10 7 

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

1)   Names of Reporting Persons:     Beau G. Chron
    
- --------------------------------------------------------------------------------
2)   Check the Appropriate Box if a Member of a Group (See Instructions)
     (a) [X]
     (b) 

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

3)   SEC Use Only

- --------------------------------------------------------------------------------
4)   Source of Funds (See Instructions)     PF

- --------------------------------------------------------------------------------
5)   Check If Disclosure Of Legal Proceedings is Required Pursuant 
     to Items 2(d) or 2(e)
                    
- --------------------------------------------------------------------------------
6)   Citizenship or Place of Organization:             USA    

- --------------------------------------------------------------------------------
                  (7)   Sole Voting Power:.            None    
    Number of
   Shares Bene-   --------------------------------------------------------------
    ficially      (8)   Shared Voting Power:           39,609      
  Owned by Each                                                                 
    Reporting     --------------------------------------------------------------
   Person With    (9)   Sole Dispositive Power:        None                  

                  --------------------------------------------------------------
                  (10)   Shared Dispositive Power:     39,609      
     
- --------------------------------------------------------------------------------
11)  Aggregate Amount Beneficially Owned by Each Reporting Person:
             39,609
     
- --------------------------------------------------------------------------------
12)  Check if the Aggregate Amount in Row (11) Excludes 
     Certain Shares (See Instructions)  

- --------------------------------------------------------------------------------
13)  Percent of Class Represented by Amount in Row (11):  less than 0.1%

     
- --------------------------------------------------------------------------------
14)  Type of Reporting Person (See Instructions)       IN

<PAGE>   18
CUSIP No. N22717 10 7 

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

1)   Names of Reporting Persons:     David Wesson
    
- --------------------------------------------------------------------------------
2)   Check the Appropriate Box if a Member of a Group (See Instructions)
     (a) [X]
     (b) 

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

3)   SEC Use Only

- --------------------------------------------------------------------------------
4)   Source of Funds (See Instructions)     PF

- --------------------------------------------------------------------------------
5)   Check If Disclosure Of Legal Proceedings is Required Pursuant 
     to Items 2(d) or 2(e)
                    
- --------------------------------------------------------------------------------
6)   Citizenship or Place of Organization:             USA    

- --------------------------------------------------------------------------------
                  (7)   Sole Voting Power:.            228,093       
    Number of
   Shares Bene-   --------------------------------------------------------------
    ficially      (8)   Shared Voting Power:           None  
  Owned by Each                                                                 
    Reporting     --------------------------------------------------------------
   Person With    (9)   Sole Dispositive Power:        228,093                

                  --------------------------------------------------------------
                  (10)   Shared Dispositive Power:     None  
     
- --------------------------------------------------------------------------------
11)  Aggregate Amount Beneficially Owned by Each Reporting Person:
             228,093
     
- --------------------------------------------------------------------------------
12)  Check if the Aggregate Amount in Row (11) Excludes 
     Certain Shares (See Instructions)

- --------------------------------------------------------------------------------
13)  Percent of Class Represented by Amount in Row (11): 0.8%

     
- --------------------------------------------------------------------------------
14)  Type of Reporting Person (See Instructions)       IN

<PAGE>   19
ITEM 1. SECURITY AND ISSUER.

     Common Stock, par value NLG 0.03 per share, of Core Laboratories N.V. The
principal offices of Core Laboratories N.V. are at Herengracht 424, 1017 BZ
Amsterdam, The Netherlands.

ITEM 2. IDENTITY AND BACKGROUND.

LEGEND:  (a) Name, (b) Residence, (c) Occupation, (d) Criminal conviction within
         last 5 years, (e) Subject to an injunction or finding involving
         securities laws, (f) Citizenship


(a)  Harrold D. Owen
(b)  3921 Sarita Drive, Fort Worth, Texas  76109
(c)  Engineer
(d)  No
(e)  No
(f)  USA

(a)  Betty Jo Owen
(b)  3921 Sarita Drive, Fort Worth, Texas  76109
(c)  homemaker
(d)  No
(e)  No
(f)  USA

(a)  H. Dean Owen, Jr.
(b)  6453 Elm Crest Court, Fort Worth, Texas  76132
(c)  Vice President and General Counsel, Owen Oil Tools, Inc.
(d)  No
(e)  No
(f)  USA

(a)  Brooke Owen Goff
(b)  3216 David Drive, Hurst, Texas  76054
(c)  homemaker
(d)  No
(e)  No
(f)  USA

(a)  Jerrod Mitchell Goff
(b)  3216 David Drive, Hurst, Texas  76054
(c)  minor child
(d)  No
(e)  No
(f)  USA

(a)  Marilyn Kate Goff
(b)  3216 David Drive, Hurst, Texas  76054
(c)  minor child
(d)  No
(e)  No
(f)  USA



<PAGE>   20



(a)  H.D. Owen, III
(b)  5204 Bryant Irvin Road, No. 1123, Fort Worth, Texas 76132
(c)  homebuilder
(d)  No
(e)  No
(f)  USA

(a)  Bryann A. Owen
(b)  6453 Elm Crest Court, Fort Worth, Texas  76109
(c)  student
(d)  No
(e)  No
(f)  USA

(a)  Bria J. Owen
(b)  6453 Elm Crest Court, Fort Worth, Texas  76109
(c)  minor child
(d)  No
(e)  No
(f)  USA

(a)  Sharron Drury
(b)  12005 County Road 1000, Godley, Texas  76044
(c)  President, Bain Industries, Inc.
(d)  No
(e)  No
(f)  USA

(a)  Derrek D. Drury
(b)  12005 County Road 1000, Godley, Texas  76044
(c)  student
(d)  No
(e)  No
(f)  USA

(a)  Daley B. Drury
(b)  12005 County Road 1000, Godley, Texas  76044
(c)  student
(d)  No
(e)  No
(f)  USA

(a)  Sharron Denee' Drury
(b)  12005 County Road 1000, Godley, Texas  76044
(c)  minor child
(d)  No
(e)  No
(f)  USA



<PAGE>   21



(a)  Kimberly Williamson
(b)  1 Croix Rollaud, 1380 Couture St. Germain, Lasne, Belgium
(c)  homemaker
(d)  No
(e)  No
(f)  USA


(a)  Reif O. Chron
(b)  237 Suzanne Way, Coppell, Texas  75019
(c)  student
(d)  No
(e)  No
(f)  USA

(a)  Beau G. Chron
(b)  237 Suzanne Way, Coppell, Texas  75019
(c)  minor child
(d)  No
(e)  No
(f)  USA

(a)  David Wesson
(b)  1412 Country Ridge, DeSoto, Texas  75115
(c)  President, Owen Oil Tools, Inc.
(d)  No
(e)  No
(f)  USA

Filers Harrold D. Owen and Betty Jo Owen are husband and wife and may constitute
a group as defined by Regulation 13d. The other filers herein may constitute a
group as defined by Regulation 13d as a result of acquisition of the reported 
securities pursuant to the referenced Merger Agreement (defined in Item 3
hereinbelow) to which all filers were party. This filing is on behalf of each
of Harrold D. Owen and Betty Jo Owen as a group together and as a group
consisting of the other filers herein. Notwithstanding, each party expressly
disclaims membership in a group immediately following such acquisition of the
securities reported herein.

ITEM 3. SOURCE AND AMOUNT OF FUNDS OR OTHER CONSIDERATION.

     Harrold D. Owen acquired 682,912 shares of common stock on June 30, 1998,
in exchange for all his common stock in Owen Oil Tools, Inc., a Texas
corporation, which shares were valued at $16,496,698, in connection with the
acquisition by Core Laboratories N.V. of all the issued and outstanding
securities of Owen Oil Tools, Inc., pursuant to an Agreement and Plan of Merger
among Core Laboratories N.V., Owen Acquisition, Inc., Owen Oil Tools, Inc. and
the Stockholders of Owen Oil Tools, Inc. (the "Merger Agreement"). All such
shares were purchased with personal funds in the form of common stock of Owen
Oil Tools, Inc. held by Mr. Owen.

     Betty Jo Owen acquired 682,912 shares of common stock on June 30, 1998, in
exchange for all her common stock in Owen Oil Tools, Inc., a Texas corporation,
which shares were valued at $16,496,698, in connection with the acquisition by
Core Laboratories N.V. of all the issued and outstanding securities of Owen Oil
Tools, Inc. pursuant to the Merger Agreement. All such shares were purchased
with personal funds in the form of common stock of Owen Oil Tools, Inc. held by
Mrs. Owen.

     H. Dean Owen, Jr. acquired 244,483 shares of common stock on June 30, 1998,
in exchange for all his common stock in Owen Oil Tools, Inc., a Texas
corporation, which shares were valued at $5,905,818, in connection with the
acquisition by Core Laboratories N.V. of all the issued and outstanding
securities of Owen Oil Tools, Inc. pursuant to the Merger Agreement. All such
shares were purchased with personal funds in the form of common stock of Owen
Oil Tools, Inc. held by Mr. Owen.

     Brooke Owen Goff acquired 39,609 shares of common stock on June 30, 1998,
in exchange for all her common stock in Owen Oil Tools, Inc., a Texas
corporation, which shares were valued at $956,808, in connection with the
acquisition by Core Laboratories N.V. of all the issued and outstanding
securities of Owen Oil Tools, Inc. pursuant to


<PAGE>   22



the Merger Agreement. All such shares were purchased with personal funds in the
form of common stock of Owen Oil Tools, Inc. held by Mrs. Goff.

     Jerrod Mitchell Goff through his Custodian Brooke Owen Goff acquired 1,366
shares of common stock on June 30, 1998, in exchange for all his common stock in
Owen Oil Tools, Inc., a Texas corporation, which shares were valued at $32,993,
in connection with the acquisition by Core Laboratories N.V. of all the issued
and outstanding securities of Owen Oil Tools, Inc. pursuant to the Merger
Agreement. All such shares were purchased with personal funds in the form of
common stock of Owen Oil Tools, Inc. held by Mr. Goff through his Custodian
Brooke Owen Goff. Mrs. Goff disclaims beneficial ownership of said 1,366 shares
purchased for her minor child.

     Marilyn Kate Goff through her Custodian Brooke Owen Goff acquired 1,366
shares of common stock on June 30, 1998, in exchange for all her common stock in
Owen Oil Tools, Inc., a Texas corporation, which shares were valued at $32,993,
in connection with the acquisition by Core Laboratories N.V. of all the issued
and outstanding securities of Owen Oil Tools, Inc. pursuant to the Merger
Agreement. All such shares were purchased with personal funds in the form of
common stock of Owen Oil Tools, Inc. held by Miss Goff through her Custodian
Brooke Owen Goff. Mrs. Goff disclaims beneficial ownership of said 1,366 shares
purchased for her minor child.

     H.D. Owen, III acquired 39,609 shares of common stock on June 30, 1998, in
exchange for all his common stock in Owen Oil Tools, Inc., a Texas corporation,
which shares were valued at $956,808, in connection with the acquisition by Core
Laboratories N.V. of all the issued and outstanding securities of Owen Oil
Tools, Inc. pursuant to the Merger Agreement. All such shares were purchased
with personal funds in the form of common stock of Owen Oil Tools, Inc. held by
Mr. Owen.

     Bryann A. Owen acquired 39,609 shares of common stock on June 30, 1998, in
exchange for all her common stock in Owen Oil Tools, Inc., a Texas corporation,
which shares were valued at $956,808, in connection with the acquisition by Core
Laboratories N.V. of all the issued and outstanding securities of Owen Oil
Tools, Inc. pursuant to the Merger Agreement. All such shares were purchased
with personal funds in the form of common stock of Owen Oil Tools, Inc. held by
Miss Owen.

     Bria J. Owen through her Custodian H. Dean Owen, Jr. acquired 39,609 shares
of common stock on June 30, 1998, in exchange for all her common stock in Owen
Oil Tools, Inc., a Texas corporation, which shares were valued at $956,808, in
connection with the acquisition by Core Laboratories N.V. of all the issued and
outstanding securities of Owen Oil Tools, Inc. pursuant to the Merger Agreement.
All such shares were purchased with personal funds in the form of common stock
of Owen Oil Tools, Inc. held by Miss Owen through her Custodian H. Dean Owen,
Jr. Mr. Owen disclaims beneficial ownership of said 39,609 shares purchased for
his minor child.

     Sharron Drury acquired 39,609 shares of common stock on June 30, 1998, in
exchange for all her common stock in Owen Oil Tools, Inc., a Texas corporation,
which shares were valued at $956,808, in connection with the acquisition by Core
Laboratories N.V. of all the issued and outstanding securities of Owen Oil
Tools, Inc. pursuant to the Merger Agreement. All such shares were purchased
with personal funds in the form of common stock of Owen Oil Tools, Inc. held by
Mrs. Drury.

     Derrek D. Drury acquired 39,609 shares of common stock on June 30, 1998, in
exchange for all his common stock in Owen Oil Tools, Inc., a Texas corporation,
which shares were valued at $956,808, in connection with the acquisition by Core
Laboratories N.V. of all the issued and outstanding securities of Owen Oil
Tools, Inc. pursuant to the Merger Agreement. All such shares were purchased
with personal funds in the form of common stock of Owen Oil Tools, Inc. held by
Mr. Drury.

     Daley B. Drury acquired 39,609 shares of common stock on June 30, 1998, in
exchange for all her common stock in Owen Oil Tools, Inc., a Texas corporation,
which shares were valued at $956,808, in connection with the acquisition by Core
Laboratories N.V. of all the issued and outstanding securities of Owen Oil
Tools, Inc. pursuant to the Merger Agreement. All such shares were purchased
with personal funds in the form of common stock of Owen Oil Tools, Inc. held by
Miss Drury.



<PAGE>   23



     Sharron Denee' Drury acquired 39,609 shares of common stock on June 30,
1998, in exchange for all her common stock in Owen Oil Tools, Inc., a Texas
corporation, which shares were valued at $956,808, in connection with the
acquisition by Core Laboratories N.V. of all the issued and outstanding
securities of Owen Oil Tools, Inc. pursuant to the Merger Agreement. All such
shares were purchased with personal funds in the form of common stock of Owen
Oil Tools, Inc. held by Miss Drury.

     Kimberly Williamson acquired 39,609 shares of common stock on June 30,
1998, in exchange for all her common stock in Owen Oil Tools, Inc., a Texas
corporation, which shares were valued at $956,808, in connection with the
acquisition by Core Laboratories N.V. of all the issued and outstanding
securities of Owen Oil Tools, Inc. pursuant to the Merger Agreement. All such
shares were purchased with personal funds in the form of common stock of Owen
Oil Tools, Inc. held by Mrs. Williamson.

     Reif O. Chron acquired 39,609 shares of common stock on June 30, 1998, in
exchange for all his common stock in Owen Oil Tools, Inc., a Texas corporation,
which shares were valued at $956,808, in connection with the acquisition by Core
Laboratories N.V. of all the issued and outstanding securities of Owen Oil
Tools, Inc. pursuant to the Merger Agreement. All such shares were purchased
with personal funds in the form of common stock of Owen Oil Tools, Inc. held by
Mr. Chron.

     Beau G. Chron through his Custodian Kimberly Williamson acquired 39,609
shares of common stock on June 30, 1998, in exchange for all his common stock in
Owen Oil Tools, Inc., a Texas corporation, which shares were valued at $956,808,
in connection with the acquisition by Core Laboratories N.V. of all the issued
and outstanding securities of Owen Oil Tools, Inc. pursuant to the Merger
Agreement. All such shares were purchased with personal funds in the form of
common stock of Owen Oil Tools, Inc. held by Mr. Chron through his Custodian
Kimberly Williamson. Mrs. Williamson disclaims beneficial ownership of said
39,609 shares purchased for her minor child.

     David Wesson acquired 228,093 shares of common stock on June 30, 1998, in
exchange for all his common stock in Owen Oil Tools, Inc., a Texas corporation,
which shares were valued at $5,509,897, in connection with the acquisition by
Core Laboratories N.V. of all the issued and outstanding securities of Owen Oil
Tools, Inc. pursuant to the Merger Agreement. All such shares were purchased
with personal funds in the form of common stock of Owen Oil Tools, Inc. held by
Mr. Wesson.


ITEM 4. PURPOSE OF TRANSACTION.

        The purpose of the transaction was for investment.



<PAGE>   24



ITEM 5. INTEREST IN SECURITIES OF THE ISSUER.

     The following persons acquired their shares of common stock of Core
Laboratories N.V. pursuant to the Merger Agreement as described in Item 3. The
per share value of the Core Laboratories N.V. common stock was $24.16 per share.

<TABLE>
<CAPTION>
                        No. Common   % of Common
Name                    Shares       Shares
- ----                    ------       ------
<S>                      <C>         <C> 
Harrold D. Owen          682,912     2.5%
Betty Jo Owen            682,912     2.5%
H. Dean Owen, Jr         244,483     0.9%
Brooke Owen Goff          39,609     less than 0.1%
Jerrod Mitchell Goff       1,366     less than 0.1%
Marilyn Kate Goff          1,366     less than 0.1%
H.D. Owen, III            39,609     less than 0.1%
Bryann A. Owen            39,609     less than 0.1%
Bria J. Owen              39,609     less than 0.1%
Sharron Drury             39,609     less than 0.1%
Derrek D. Drury           39,609     less than 0.1%
Daley B. Drury            39,609     less than 0.1%
Sharron Denee' Drury      39,609     less than 0.1%
Kimberly Williamson       39,609     less than 0.1%
Reif O. Chron             39,609     less than 0.1%
Beau G. Chron             39,609     less than 0.1%
David Wesson             228,093     0.8%

               Total   2,276,829     6.8%
</TABLE>

     Each holder has the sole power to vote or direct the vote, and the sole
power to dispose or direct the disposition, of the shares, except for those
shares held by Custodians for Jerrod Mitchell Goff, Marilyn Kate Goff, Bria J.
Owen, and Beau G. Chron, minor children, as described in Item 3 above, which
shares will be voted and controlled by their respective Custodians until such
children reach the age of majority, respectively. Except for such minor children
and their Custodians, none of the above holders, nor any other person, share any
power to vote or direct the vote of such shares, nor do they share the power to
dispose or direct the disposition of such shares. None of the above persons are
directors or officers of Core Laboratories N.V.

ITEM 6. CONTRACTS, ARRANGEMENTS, UNDERSTANDINGS OR RELATIONSHIPS WITH RESPECT TO
        SECURITIES OF THE ISSUER.

     There are no contracts, arrangements, understandings or relationships
(legal or otherwise) among the persons named in Item 2, or between such persons
and any person with respect to any securities of the issuer, nor are there any
securities that are pledged or otherwise subject to a contingency the occurrence
of which would give another person voting power or investment power over such
securities, other than the following:

     --   Agreement and Plan of Merger dated June 30, 1998, among Core
          Laboratories N.V., Owen Acquisition, Inc., Owen Oil Tools, Inc. and
          the Stockholders of Owen Oil Tools, Inc.

     --   Escrow Agreement dated June 30, 1998, among Core Laboratories N.V.,
          Owen Acquisition, Inc., Owen Oil Tools, Inc., H.Dean Owen, Jr., and
          Bankers Trust Company.

     --   The parent Custodians of the minor children, described in Items 3 and
          5, hold voting power and such other power over such shares as provided
          pursuant to the Texas Uniform Transfers to Minors Act, as amended.



<PAGE>   25



The persons named in Item 2 disclaim group status except to the extent governed
by the above matters disclosed in this Item 6.


ITEM 7. MATERIAL TO BE FILED AS EXHIBITS.

        Exhibit 99.1 - Agreement and Plan of Merger dated June 30, 1998, among
                       Core Laboratories N.V., Owen Acquisition, Inc., Owen Oil 
                       Tools, Inc. and the Stockholders of Owen Oil Tools, Inc.



<PAGE>   26



SIGNATURE.

     After reasonable inquiry and to the best of my knowledge and belief, I
certify that the information set forth in this statement is true, complete and
correct.



 July 15, 1998           /s/ HARROLD D. OWEN
- ------------------   ---------------------------------------------------
(Date)               Harrold D. Owen


<PAGE>   27


SIGNATURE.

     After reasonable inquiry and to the best of my knowledge and belief, I
certify that the information set forth in this statement is true, complete and
correct.



 July 15, 1998           /s/ BETTY JO OWEN
- ------------------   ---------------------------------------------------
(Date)               Betty Jo Owen


<PAGE>   28


SIGNATURE.

     After reasonable inquiry and to the best of my knowledge and belief, I
certify that the information set forth in this statement is true, complete and
correct.

  July 16, 1998          /s/ H. DEAN OWEN, JR.
- ------------------   ---------------------------------------------------
(Date)               H. Dean Owen, Jr.


<PAGE>   29


SIGNATURE.

     After reasonable inquiry and to the best of my knowledge and belief, I
certify that the information set forth in this statement is true, complete and
correct.

  July 15, 1998          /s/ BROOKE OWEN GOFF
- ------------------   ---------------------------------------------------
(Date)               Brooke Owen Goff


<PAGE>   30


SIGNATURE.

     After reasonable inquiry and to the best of my knowledge and belief, I
certify that the information set forth in this statement is true, complete and
correct.



  July 15, 1998          /s/ BROOKE OWEN GOFF     
- ------------------   ---------------------------------------------------
(Date)               Brooke Owen Goff, as Custodian 
                     for Jerrod Mitchell Goff


<PAGE>   31


SIGNATURE.

     After reasonable inquiry and to the best of my knowledge and belief, I
certify that the information set forth in this statement is true, complete and
correct.

  July 15, 1998          /s/ BROOKE OWEN GOFF
- ------------------   ---------------------------------------------------
(Date)               Brooke Owen Goff, as Custodian
                     for Marilyn Kate Goff


<PAGE>   32


SIGNATURE.

     After reasonable inquiry and to the best of my knowledge and belief, I
certify that the information set forth in this statement is true, complete and
correct.

  July 16, 1998          /s/ H.D. OWEN, III
- ------------------   ---------------------------------------------------
(Date)               H.D. Owen, III


<PAGE>   33


SIGNATURE.

     After reasonable inquiry and to the best of my knowledge and belief, I
certify that the information set forth in this statement is true, complete and
correct.

  July 16, 1998          /s/ BRYANN A. OWEN
- ------------------   ---------------------------------------------------
(Date)               Bryann A. Owen


<PAGE>   34


SIGNATURE.

     After reasonable inquiry and to the best of my knowledge and belief, I
certify that the information set forth in this statement is true, complete and
correct.

  July 16, 1998          /s/ H. DEAN OWEN, JR.
- ------------------   ---------------------------------------------------
(Date)               H. Dean Owen, Jr., as Custodian for Bria J. Owen


<PAGE>   35


SIGNATURE.

     After reasonable inquiry and to the best of my knowledge and belief, I
certify that the information set forth in this statement is true, complete and
correct.



  July 15, 1998          /s/ SHARRON DRURY
- ------------------   ---------------------------------------------------
(Date)               Sharron Drury


<PAGE>   36


SIGNATURE.

     After reasonable inquiry and to the best of my knowledge and belief, I
certify that the information set forth in this statement is true, complete and
correct.



  July 17, 1998          /s/ DERREK D. DRURY
- ------------------   ---------------------------------------------------
(Date)               Derrek D. Drury


<PAGE>   37


SIGNATURE.

     After reasonable inquiry and to the best of my knowledge and belief, I
certify that the information set forth in this statement is true, complete and
correct.

July 23, 1998        /s/ DALEY B. DRURY
- ------------------   ---------------------------------------------------
(Date)               Daley B. Drury


<PAGE>   38


SIGNATURE.

     After reasonable inquiry and to the best of my knowledge and belief, I
certify that the information set forth in this statement is true, complete and
correct.



  July 15, 1998          /s/ SHARRON DRURY
- ------------------   ----------------------------------------------------------
(Date)               Sharron Denee' Drury, by her legal guardian, Sharron Drury


<PAGE>   39


SIGNATURE.

     After reasonable inquiry and to the best of my knowledge and belief, I
certify that the information set forth in this statement is true, complete and
correct.

  July 17, 1998          /s/ KIMBERLY WILLIAMSON
- ------------------   ---------------------------------------------------
(Date)               Kimberly Williamson


<PAGE>   40


SIGNATURE.

     After reasonable inquiry and to the best of my knowledge and belief, I
certify that the information set forth in this statement is true, complete and
correct.

  July 15, 1998          /s/ REIF O. CHRON
- ------------------   ---------------------------------------------------
(Date)               Reif O. Chron


<PAGE>   41


SIGNATURE.

     After reasonable inquiry and to the best of my knowledge and belief, I
certify that the information set forth in this statement is true, complete and
correct.

  July 17, 1998          /s/ KIMBERLY WILLIAMSON
- ------------------   ---------------------------------------------------
(Date)               Kimberly Williamson, as Custodian for Beau G. Chron


<PAGE>   42


SIGNATURE.

     After reasonable inquiry and to the best of my knowledge and belief, I
certify that the information set forth in this statement is true, complete and
correct.

  July 15, 1998          /s/ DAVID WESSON
- ------------------   ---------------------------------------------------
(Date)               David Wesson
<PAGE>   43


                                INDEX TO EXHIBITS

<TABLE>
<CAPTION>
EXHIBIT
NUMBER                                 EXHIBIT
- ------                                 ------- 
<S>                 <C>

Exhibit 99.1 -      Agreement and Plan of Merger dated June 30, 1998, among
                    Core Laboratories N.V., Owen Acquisition, Inc., Owen Oil 
                    Tools, Inc. and the Stockholders of Owen Oil Tools, Inc.
</TABLE>


<PAGE>   1

                                                                    EXHIBIT 99.1


                          AGREEMENT AND PLAN OF MERGER

                                      AMONG

                             CORE LABORATORIES N.V.,

                             OWEN ACQUISITION, INC.,

                              OWEN OIL TOOLS, INC.

                                       AND

                               THE STOCKHOLDERS OF
                              OWEN OIL TOOLS, INC.






                                  JUNE 30, 1998





<PAGE>   2



                                TABLE OF CONTENTS


                                    ARTICLE I

                                   THE MERGER
<TABLE>


<S>                                                                                                              <C>
1.01     THE MERGER...............................................................................................1
1.02     EFFECTIVE TIME...........................................................................................2
1.03     EFFECT OF THE MERGER.....................................................................................2
1.04     ARTICLES OF INCORPORATION; BYLAWS........................................................................2
1.05     DIRECTORS AND OFFICERS...................................................................................2
1.06     ACQUISITION CONSIDERATION; CONVERSION AND CANCELLATION OF SECURITIES.....................................2
1.07     PAYMENT FOR COMPANY STOCK; SURRENDER OF CERTIFICATES.....................................................4
1.08     NO FRACTIONAL SHARES.....................................................................................5
1.09     AGREEMENT TO VOTE SHARES.................................................................................5
1.10     WITHHOLDING..............................................................................................5
1.11     CLOSING..................................................................................................6
1.12     ACTIONS AT CLOSING.......................................................................................6
1.13     STOCK TRANSFER BOOKS.....................................................................................6
1.14     TAKING OF NECESSARY ACTION; FURTHER ACTION...............................................................6
</TABLE>

                                   ARTICLE II

                         REPRESENTATIONS AND WARRANTIES
                       OF THE COMPANY AND THE SHAREHOLDERS
<TABLE>


<S>                                                                                                              <C>
2.01     ORGANIZATION AND QUALIFICATION; SUBSIDIARIES.............................................................6
2.02     ORGANIZATIONAL DOCUMENTS.................................................................................7
2.03     CAPITALIZATION...........................................................................................7
2.04     AUTHORITY................................................................................................8
2.05     NO CONFLICT; REQUIRED FILINGS AND CONSENTS...............................................................8
2.06     PERMITS; COMPLIANCE......................................................................................9
2.07     FINANCIAL STATEMENTS.....................................................................................9
2.08     ABSENCE OF CERTAIN CHANGES OR EVENTS....................................................................10
2.09     LITIGATION..............................................................................................10
2.10     EMPLOYEE BENEFIT PLANS; LABOR MATTERS...................................................................10
2.11     TAXES...................................................................................................13
2.12     POOLING; TAX MATTERS....................................................................................13
2.13     AFFILIATES..............................................................................................14
2.14     CERTAIN BUSINESS PRACTICES..............................................................................14
2.15     ENVIRONMENTAL...........................................................................................14
2.16     UNDISCLOSED LIABILITIES.................................................................................15
</TABLE>



                                       -i-



<PAGE>   3

<TABLE>


<S>                                                                                                             <C>
2.17     CERTAIN AGREEMENTS......................................................................................15
2.18     CONTRACTS AND COMMITMENTS...............................................................................15
2.19     AFFILIATE INTERESTS.....................................................................................16
2.20     INTELLECTUAL PROPERTY...................................................................................16
2.21     BROKERS.................................................................................................16
2.22     INSURANCE...............................................................................................16
2.23     PROPERTIES..............................................................................................17
2.24     GOOD TITLE..............................................................................................17
2.25     CERTAIN SECURITIES LAW MATTERS..........................................................................17
2.26     AUTHORIZATION AND VALIDITY OF AGREEMENT.................................................................19
</TABLE>

                                  ARTICLE III

                   REPRESENTATIONS AND WARRANTIES OF ACQUIROR
<TABLE>


<S>                                                                                                             <C>
3.01     ORGANIZATION AND QUALIFICATION..........................................................................19
3.02     CAPITALIZATION..........................................................................................20
3.03     AUTHORITY...............................................................................................20
3.04     NO CONFLICT; REQUIRED FILINGS AND CONSENTS..............................................................20
3.05     REPORTS; FINANCIAL STATEMENTS...........................................................................21
3.06     ABSENCE OF CERTAIN CHANGES OR EVENTS....................................................................22
3.07     POOLING; TAX MATTERS....................................................................................22
3.08     BROKERS.................................................................................................22
</TABLE>

                                   ARTICLE IV

                         COVENANTS OF THE SHAREHOLDERS
<TABLE>


<S>                                                                                                             <C>
4.01     AFFIRMATIVE COVENANT....................................................................................22
4.02     NEGATIVE COVENANTS......................................................................................22
4.03     REPLACEMENT OF PROMISSORY NOTE..........................................................................23
</TABLE>

                                   ARTICLE V

                            COVENANTS OF THE COMPANY
<TABLE>


<S>                                                                                                             <C>
5.01     AFFIRMATIVE COVENANTS OF THE COMPANY....................................................................23
5.02     NEGATIVE COVENANTS OF THE COMPANY.......................................................................24
</TABLE>


                                      -ii-

<PAGE>   4



                                   ARTICLE VI

                              COVENANTS OF ACQUIROR

<TABLE>


<S>                                                                                                             <C>
6.01     AFFIRMATIVE COVENANTS OF ACQUIROR.......................................................................26
6.02     NEGATIVE COVENANTS OF ACQUIROR..........................................................................26
6.03     PAYMENT TO LENDER OF THE COMPANY........................................................................27
</TABLE>




                                   ARTICLE VII

                              ADDITIONAL AGREEMENTS

<TABLE>


<S>                                                                                                             <C>
7.01     NOTIFICATION OF CERTAIN MATTERS.........................................................................27
7.02     ACCESS AND INFORMATION..................................................................................27
7.03     APPROPRIATE ACTION; CONSENTS; FILINGS...................................................................28
7.04     AFFILIATES; POOLING.....................................................................................30
7.05     PUBLIC ANNOUNCEMENTS....................................................................................30
7.06     EXPENSES................................................................................................30
7.07     EMPLOYEES OF COMPANY....................................................................................30
7.08     TAX-FREE REORGANIZATION.................................................................................31
7.09     INFORMATION FOR TAX RETURNS.............................................................................31
</TABLE>

                                  ARTICLE VIII

                                 INDEMNIFICATION
<TABLE>


<S>                                                                                                             <C>
8.01     IN GENERAL..............................................................................................31
8.02     NO EXHAUSTION OF REMEDIES...............................................................................32
8.03     DEFENSE OF THIRD PARTY CLAIMS...........................................................................32
8.04     PAYMENT; ARBITRATION....................................................................................33
8.05     SATISFACTION OF CLAIMS FROM ESCROW SHARES...............................................................33
8.06     LIABILITY LIMITATIONS; SURVIVAL OF REPRESENTATIONS AND WARRANTIES.......................................34
8.07     SUBROGATION.............................................................................................34
</TABLE>


                                   ARTICLE IX

                                   CONDITIONS
<TABLE>


<S>                                                                                                             <C>
9.01     CONDITIONS PRECEDENT TO OBLIGATIONS OF THE ACQUIROR COMPANIES...........................................35
9.02     CONDITIONS PRECEDENT TO OBLIGATIONS OF THE COMPANY......................................................36
</TABLE>


                                    ARTICLE X

                                  MISCELLANEOUS

<TABLE>

<S>                                                                                                             <C>
10.01    TERMINATION.............................................................................................38
10.02    EFFECT OF TERMINATION...................................................................................38
</TABLE>


                                      -iii-



<PAGE>   5


<TABLE>

<S>                                                                                                             <C>
10.03    WAIVER AND AMENDMENT....................................................................................38
10.04    ENTIRE AGREEMENT; THIRD PARTY BENEFICIARIES.............................................................39
10.05    ASSIGNMENT..............................................................................................39
10.06    CERTAIN DEFINITIONS.....................................................................................39
10.07    NOTICES.................................................................................................40
10.08    GOVERNING LAW...........................................................................................42
10.09    SEVERABILITY............................................................................................42
10.10    COUNTERPARTS............................................................................................42
10.11    HEADINGS................................................................................................42
10.12    MANDATORY MEDIATION; BINDING ARBITRATION; VENUE; ATTORNEYS' FEES........................................42
</TABLE>


EXHIBITS

Exhibit A         --        Escrow Agreement
Exhibit B         --        Appointment of Personal Representatives
Exhibit C         --        Form of Company Affiliates' Letter
Exhibit D         --        Amendment to Employment Agreement - David Wesson
Exhibit D-1       --        Employment Agreement of H. Dean Owen, Jr.
Exhibit E         --        Lease Agreement
Exhibit F         --        Registration Rights Agreement



                                      -iv-



<PAGE>   6



                          AGREEMENT AND PLAN OF MERGER


         This Agreement and Plan of Merger (this "Agreement") is made and
entered into as of June 30, 1998 by and among Core Laboratories N.V., a
Netherlands limited liability company ("Acquiror"), Owen Acquisition, Inc., a
Texas corporation with its principal place of business in Houston, Texas, and an
indirect wholly-owned subsidiary of Acquiror ("Acquisition Sub"), Owen Oil
Tools, Inc., a Texas corporation (the "Company"), and the stockholders of the
Company set forth on the signature pages hereto (collectively, the
"Shareholders"). Acquiror and Acquisition Sub are sometimes collectively
referred to herein as the "Acquiror Companies."

                                    RECITALS

         The Shareholders own, beneficially and of record, all of the
outstanding capital stock of the Company.

         Acquisition Sub, upon the terms and subject to the conditions of this
Agreement and in accordance with the Texas Business Corporation Act (the
"TBCA"), will merge with and into the Company (the "Merger").

         The Board of Directors of the Company has determined that the Merger is
consistent with and in furtherance of the long-term business strategy of the
Company and is fair to, and in the best interests of, the Company and the
Shareholders and has approved and adopted this Agreement and the transactions
contemplated hereby, and recommended approval and adoption of this Agreement and
the Merger by the Shareholders.

         This Agreement and the Merger have been approved and adopted by the
requisite vote of the Shareholders and of the shareholder of Acquisition Sub as
required by the TBCA.

         For federal income tax purposes, it is intended that the Merger will
qualify as a reorganization within the meaning of the provisions of section
368(a) of the Internal Revenue Code of 1986, as amended (the "Code").

         The Merger is intended to be treated as a "pooling of interests" for
financial accounting purposes under United States generally accepted accounting
principles ("GAAP").

         NOW, THEREFORE, in consideration of the mutual representations,
warranties, covenants and agreements herein contained, and other good and
valuable consideration, the receipt and sufficiency of which are hereby
acknowledged, the parties hereto agree as follows:

                                    ARTICLE I

                                   THE MERGER

         1.01 THE MERGER. Upon the terms and subject to the conditions set forth
in this Agreement, and in accordance with the TBCA, at the Effective Time (as
defined in Section 1.02 of


<PAGE>   7



this Agreement), Acquisition Sub shall be merged with and into the Company. As a
result of the Merger, the separate corporate existence of Acquisition Sub shall
cease and the Company shall continue as the surviving corporation of the Merger
as a wholly-owned subsidiary of Core Laboratories, Inc. and an indirect
wholly-owned subsidiary of Acquiror (the "Surviving Corporation"). The name of
the Surviving Corporation shall be "Owen Oil Tools, Inc."

         1.02 EFFECTIVE TIME. As promptly as practicable after the satisfaction
or, if permissible, waiver of the conditions set forth in Article IX of this
Agreement, the parties hereto shall cause the Merger to be consummated by filing
Articles of Merger with the Secretary of State of the State of Texas, in such
form as required by, and executed in accordance with the relevant provisions of,
the TBCA (the date and time of the completion of such filing being the
"Effective Time").

         1.03 EFFECT OF THE MERGER. At the Effective Time, the effect of the
Merger shall be as provided in the applicable provisions of the TBCA. Without
limiting the generality of the foregoing, and subject thereto, at the Effective
Time, except as otherwise provided herein, all the property, rights, privileges,
powers and franchises of Acquisition Sub and the Company shall vest in the
Surviving Corporation, and all debts, liabilities and duties of Acquisition Sub
and the Company shall become the debts, liabilities and duties of the Surviving
Corporation.

         1.04 ARTICLES OF INCORPORATION; BYLAWS. At the Effective Time, the
Articles of Incorporation and the Bylaws of Acquisition Sub, as in effect
immediately prior to the Effective Time, shall be the Articles of Incorporation
and the Bylaws of the Surviving Corporation, except that Article I of the
Articles of Incorporation thereof shall be amended to read "The name of the
corporation is Owen Oil Tools, Inc.", and the Bylaws shall be amended so as to
reflect that the name of the Surviving Corporation has been changed to Owen Oil
Tools, Inc.

         1.05 DIRECTORS AND OFFICERS. The sole director of the Surviving
Corporation shall, from and after the Effective Time, be David M. Demshur, and
the officers of the Surviving Corporation shall, from and after the Effective
Time, be:

<TABLE>
<CAPTION>

NAME                                                                 TITLE
- ----                                                                 ----- 
<S>                                                                <C>
David S. Wesson....................................................President
Richard L. Bergmark................................................Treasurer
John D. Denson.....................................................Secretary
</TABLE>

in each case, until their respective successors are duly elected or appointed
and qualified or until their earlier resignation or removal in accordance with
the Surviving Corporation's Articles of Incorporation and Bylaws.

         1.06 ACQUISITION CONSIDERATION; CONVERSION AND CANCELLATION OF
SECURITIES. At the Effective Time, by virtue of the Merger and without any
action on the part of the Acquiror Companies, the Company or the holders of any
of the Company's securities:

              (a) Subject to the other provisions of this Article I, each share
         of the Company's common stock, par value $1.00 per share ("Company
         Stock"), issued and outstanding 

                                       -2-


<PAGE>   8
         immediately prior to the Effective Time (excluding any Company Stock
         described in Section 1.06(c) of this Agreement), shall be converted
         into 1,365.8242 shares of duly authorized, validly issued, fully paid
         and nonassessable common shares, par value NLG 0.03 per share
         ("Acquiror Shares"), of Acquiror (the "Exchange Ratio"), subject to the
         escrow of a portion of such shares pursuant to the terms and conditions
         set forth herein. At the Effective Time, Acquiror will cause to be
         delivered to, and directly deposited with, Bankers Trust Company or
         another national bank acceptable to the Company and Acquiror (the
         "Escrow Agent"), in escrow for the account and future potential benefit
         of the Shareholders, a stock certificate representing 227,684 Acquiror
         Shares, which certificate shall be registered as follows: "Bankers
         Trust Company, f/b/o the Former Shareholders of the Common Stock of
         Owen Oil Tools, Inc." All such Acquiror Shares so delivered to the
         Escrow Agent, together with all subsequent stock dividends or
         distributions of other Acquiror Shares received in respect of such
         shares while deposited with the Escrow Agent shall be referred to as
         "Escrow Shares." A pro rata number of the Escrow Shares (determined on
         the basis of the respective ownership interests of each Shareholder of
         Company Stock immediately prior to the Effective Time, subject to
         adjustments by the Escrow Agent to eliminate fractional shares) shall
         be subtracted from the number of Acquiror Shares each Shareholder of
         Company Stock at the Effective Time is entitled to receive pursuant to
         the Merger. The Escrow Shares shall be held by the Escrow Agent
         pursuant to the terms and conditions of an Escrow Agreement
         substantially in the form attached hereto as Exhibit A (the "Escrow
         Agreement") between Acquiror, Acquisition Sub, the Company and H. Dean
         Owen, Jr. (the "Shareholders' Representative"). The Shareholders will
         appoint a Shareholders' Representative pursuant to, and he shall have
         the rights and obligations set forth in, the Appointment of Personal
         Representative, substantially in the form attached hereto as Exhibit B
         (the "Appointment"). The Escrow Agreement and the Appointment shall
         authorize the Shareholders' Representative to control the disposition
         of such Escrow Shares pursuant to the terms of the Escrow Agreement.
         The Shareholders' Representative shall have no personal liability as a
         result of any actions taken in such position (i) to Acquiror or
         Acquisition Sub, or (ii) to any holder of Company Stock at the
         Effective Time, in either case with respect to the disposition of the
         Escrow Shares or any other action taken by him as the Shareholders'
         Representative, unless such actions constitute gross negligence or
         willful misconduct by the Shareholders' Representatives. The number of
         Acquiror Shares each Shareholder shall be entitled to receive at the
         Effective Time and the number of Escrow Shares attributable to such
         Shareholder shall be as set forth on Schedule 1.06(a) to this
         Agreement.

              (b) As a result of their conversion pursuant to Section 1.06(a) of
         this Agreement, all shares of Company Stock shall cease to be
         outstanding and shall automatically be canceled and retired, and each
         certificate ("Certificate") previously evidencing Company Stock
         outstanding immediately prior to the Effective Time (other than any
         Company Stock described in Section 1.06(c) of this Agreement)
         ("Converted Shares") shall thereafter represent that number of Acquiror
         Shares determined pursuant to the Exchange Ratio, rounded up or down to
         the nearest whole share (the "Acquisition Consideration"). The holders
         of Certificates previously evidencing Converted Shares shall cease to
         have any rights with respect to such Converted Shares except the right
         to receive the Acquisition 

                                      -3-


<PAGE>   9

         Consideration and as otherwise provided herein or by applicable
         federal, state, foreign or local law, statute, ordinance, rule or
         regulation (collectively, "Laws"). Such Certificates previously
         evidencing Converted Shares shall be exchanged for certificates
         evidencing whole shares of Acquiror Common Stock upon the surrender of
         such Certificates in accordance with the provisions of Section 1.07 of
         this Agreement. No fractional shares of Acquiror Common Stock shall be
         issued.

                  (c) Notwithstanding any provision of this Agreement to the
         contrary, each share of Company Stock held in the treasury of the
         Company and each share of Company Stock or other capital stock of the
         Company owned by Acquiror or any direct or indirect wholly owned
         subsidiary of Acquiror or of the Company immediately prior to the
         Effective Time shall be canceled and extinguished without any
         conversion thereof and no payment shall be made with respect thereto.

                  (d) In the event that on or after the date of this Agreement,
         Acquiror shall establish a record date prior to the Closing Date for
         all its shareholders entitled to receive any securities, rights or
         property of Acquiror (other than regular dividends), by reason of the
         issuance of rights or options to purchase its securities, stock
         dividends or distribution, or any stock split or reverse stock split,
         or if there shall occur any capital reorganization of Acquiror or
         reclassification of its capital stock or such other similar transaction
         which will not be adequately reflected in the number of Acquiror Shares
         which will constitute the Acquisition Consideration, such number of
         Acquiror Shares shall be fairly and proportionately adjusted to prevent
         dilution, and to fully and completely carry out the intent of the
         parties as contemplated by this Agreement.

                  (e) Each share of common stock, par value $.01 per share, of
         Acquisition Sub issued and outstanding immediately prior to the
         Effective Time shall be converted into one share of common stock, par
         value $.01 per share, of the Surviving Corporation.

         1.07     PAYMENT FOR COMPANY STOCK; SURRENDER OF CERTIFICATES.

                  (a) Exchange Procedures. Promptly after the Effective Time,
Acquiror shall deliver to each record holder of Company Stock at the Effective
Time a letter of transmittal (which shall specify that delivery shall be
effected, and risk of loss and title to the Certificates shall pass, only upon
delivery of the Certificates to Acquiror and shall be in such form and contain
such other provisions as the Company and Acquiror shall agree) (the "Letter of
Transmittal"). Upon surrender of a Certificate for cancellation to the Acquiror,
together with such Letter of Transmittal, duly executed, the holder of such
Certificate shall be entitled to receive in exchange therefor a certificate
representing that number of whole Acquiror Shares that such holder has the right
to receive pursuant to the provisions of this Article I, less the Escrow Shares
attributable to such holder that will be issued and deposited with the Escrow
Agent for the account of such holder, and the Certificate so surrendered shall
forthwith be canceled. In the event of a transfer of ownership of Company Stock
that is not registered in the transfer records of the Company, a certificate
evidencing the proper number of Acquiror Shares may be issued to the transferee
if the Certificate evidencing the Company Stock shall be surrendered to the
Acquiror, accompanied by all documents required to evidence and



                                       -4-


<PAGE>   10


effect such transfer and by evidence that any applicable stock transfer taxes
have been paid. Until surrendered for exchange in accordance with the provisions
of this Section 1.07(a), each Certificate theretofore representing Converted
Shares (other than shares of Company Stock to be canceled pursuant to Section
1.06(c) of this Agreement) shall from and after the Effective Time represent for
all purposes only the right to receive the Acquisition Consideration as set
forth in this Agreement. If any holder of Converted Shares shall be unable to
surrender such holder's Certificates because such Certificates have been lost or
destroyed, such holder may deliver in lieu thereof an affidavit and indemnity
bond in form and substance and with surety reasonably satisfactory to Acquiror.
No interest shall be paid on any Acquisition Consideration payable to former
holders of Converted Shares.

                  (b) Distributions with Respect to Acquiror Shares. No
dividends or other distributions declared or made after the Effective Time with
respect to Acquiror Shares with a record date after the Effective Time shall be
paid to the holder of any unsurrendered Certificate with respect to the Acquiror
Shares evidenced thereby, and no Acquisition Consideration shall be paid to any
such holder until the holder of such Certificate shall surrender such
Certificate. Subject to applicable Laws, following surrender of any such
Certificate, there shall be paid to the holder of the certificates evidencing
whole Acquiror Shares issued in exchange therefor, without interest, (i)
promptly following the surrender of such Certificate, the amount of dividends or
other distributions with a record date after the Effective Time theretofore paid
with respect to such whole Acquiror Shares and (ii), at the appropriate payment
date, the amount of dividends or other distributions with a record date after
the Effective Time but prior to surrender and a payment date occurring after
surrender payable with respect to such whole Acquiror Shares.

         1.08     NO FRACTIONAL SHARES. Notwithstanding anything herein to the
contrary, no certificates or scrip evidencing fractional Acquiror Shares shall
be issued upon the surrender for exchange of Certificates and such fractional
share interests will not entitle the owner thereof to vote or to any rights as a
shareholder of Acquiror.

         1.09     AGREEMENT TO VOTE SHARES. At any meeting of the Shareholders 
with respect to any of the following, and at any adjournment thereof, and with
respect to any consent solicited with respect to any of the following, each
Shareholder who is a party to this Agreement hereby agrees to vote such
Shareholder's Company Stock (i) in favor of approval of the Merger and any
matter which could reasonably be expected to facilitate the Merger and (ii)
against approval of any proposal made in opposition to or in competition with
the Merger, against any merger, consolidation, sale of assets, reorganization or
recapitalization with any party, against any liquidation or winding up of the
Company and against any other matter which would, or could reasonably be
expected to, prohibit or discourage the Merger.

         1.10     WITHHOLDING. Acquiror (or any affiliate thereof) shall be 
entitled to deduct and withhold from the consideration otherwise payable
pursuant to this Agreement to any former holder of Converted Shares such amounts
as Acquiror (or any affiliate thereof) is required to deduct and withhold with
respect to the making of such payment under the Code (as hereinafter defined),
or any other provision of federal, state, local or foreign tax law. To the
extent that amounts are so withheld by Acquiror, such withheld amounts shall be
treated for all purposes of this Agreement as having 


                                       -5-


<PAGE>   11


been paid to the former holder of the Converted Shares in respect of which such
deduction and withholding was made by Acquiror.

         1.11     CLOSING. The Closing shall take place at the offices of Vinson
& Elkins L.L.P., 1001 Fannin Street, 3600 First City Tower, Houston, Texas
77002-6760, at (a) 10:00 a.m., local time, on June 30, 1998, or (b) if the
conditions set forth in Article IX of this Agreement have not been satisfied or
waived on or before June 30, 1998, at 10:00 a.m., local time, on the second
business day following the date on which the conditions set forth in Article IX
of this Agreement have been satisfied or waived or (c) at such other place, time
and date as the parties hereto may agree. At the conclusion of the Closing, the
parties hereto shall cause the Articles of Merger to be filed with the Secretary
of State of the State of Texas.

         1.12     ACTIONS AT CLOSING. At the Closing, (a) the Company shall 
deliver to the Acquiror Companies the various certificates, instruments and
documents referred to in Section 9.01 of this Agreement, (b) the Acquiror
Companies shall deliver to the Company and the Shareholders the various
certificates, instruments and documents referred to in Section 9.02 of this
Agreement, and (c) the parties shall file with the Secretary of State of the
State of Texas the Articles of Merger.

         1.13     STOCK TRANSFER BOOKS. At the Effective Time, the stock 
transfer books of the Company shall be closed and there shall be no further
registration of transfers of shares of Company Stock thereafter on the records
of the Company.

         1.14     TAKING OF NECESSARY ACTION; FURTHER ACTION. Acquiror and the
Company shall take all such reasonable and lawful action as may be necessary or
appropriate in order to effectuate the Merger as promptly as possible. If, at
any time after the Effective Time, any such further action is necessary or
desirable to carry out the purposes of this Agreement and to vest the Surviving
Corporation with full right, title and possession to all assets, property,
rights, privileges, powers and franchises of the Company or Acquisition Sub,
such corporations shall direct their respective officers and directors to take
all such lawful and necessary action.

                                   ARTICLE II

                         REPRESENTATIONS AND WARRANTIES
                       OF THE COMPANY AND THE SHAREHOLDERS

         The Company and each of the Shareholders of the Company, jointly and
severally, hereby represents and warrants to Acquiror, as of the date hereof and
at the Closing Date, that:

         2.01     ORGANIZATION AND QUALIFICATION; SUBSIDIARIES. Except as set 
forth in Section 2.01 of the Company Disclosure Schedule (as hereinafter
defined), the Company is a corporation, and each of the Company's subsidiaries
(as such term in defined in Section 10.06 herein) is a corporation duly
organized, validly existing and in good standing under the laws of the
jurisdiction of its incorporation or organization, and each of the Company and
its subsidiaries has all requisite power and authority to own, lease and operate
its properties and to carry on its business as it is now being conducted and is
duly qualified and in good standing to do business in each jurisdiction in which
the 


                                      -6-
<PAGE>   12


nature of the business conducted by it or the ownership or leasing of its
properties makes such qualification necessary, other than where the failure to
be so duly qualified and in good standing could not reasonably be expected to
have a Company Material Adverse Effect. The term "Company Material Adverse
Effect" as used in this Agreement shall mean any change or effect that would be
materially adverse to the financial condition, results of operations, business
or prospects of the Company and its subsidiaries, taken as a whole, at the time
of such change or effect. Section 2.01 of the Disclosure Schedule delivered by
the Company to Acquiror concurrently with the execution of this Agreement (the
"Company Disclosure Schedule") sets forth, as of the date of this Agreement, a
true and complete list of all the Company's directly or indirectly owned
subsidiaries, together with the jurisdiction of incorporation or organization of
each subsidiary and the percentage of each subsidiary's outstanding capital
stock or other equity interests of the Company or another subsidiary of the
Company.

         2.02     ORGANIZATIONAL DOCUMENTS. The Company has heretofore furnished
or made available to Acquiror complete and correct copies of the Articles of
Incorporation and the Bylaws (or equivalent organizational documents), in each
case as amended or restated to the date hereof, of the Company and each of its
subsidiaries. Neither the Company nor any of its subsidiaries is in violation of
any of the provisions of its Articles of Incorporation or Bylaws (or equivalent
organizational documents).

         2.03     CAPITALIZATION.

                  (a) The authorized capital stock of the Company consists of
100,000 shares of Common Stock, par value $1.00 per share, and 100,000 shares of
Preferred Stock, par value $10.00 per share. As of the date of this Agreement,
1,667 shares of Common Stock are issued and outstanding, and no shares of
Preferred Stock are issued and outstanding. As of the date of this Agreement,
there are 500 shares of Common Stock and 2,000 shares of Preferred Stock held by
the Company in its treasury, and no shares of Common Stock or Preferred Stock
are reserved for issuance. Each of the issued shares of capital stock of, or
other equity interests in, each of the Company and its subsidiaries is duly
authorized, validly issued and, in the case of shares of capital stock, fully
paid and nonassessable, and has not been issued in violation of (nor are any of
the authorized shares of capital stock of, or other equity interests in, the
Company or any of its subsidiaries subject to) any preemptive or similar rights
created by statute, the Articles of Incorporation or Bylaws (or the equivalent
organizational documents) of the Company or any of its subsidiaries, or any
agreement to which the Company or any of its subsidiaries is a party or is
bound, and all such issued shares or other equity interests of the Company or a
subsidiary of the Company are owned free and clear of all security interests,
liens, claims, pledges, agreements, limitations on the Company's or such
subsidiaries' voting rights, charges or other encumbrances of any nature
whatsoever.

                  (b) No bonds, debentures, notes or other indebtedness of the
Company having the right to vote (or convertible into or exchangeable or
exercisable for securities having the right to vote) on any matters on which
shareholders may vote ("Company Voting Debt") are issued or outstanding.


                                      -7-
<PAGE>   13


                  (c) Except as set forth in Section 2.03(c) of the Company
Disclosure Schedule, there are no options, warrants or other rights (including
registration rights), agreements, arrangements or commitments of any character
to which the Company or any of its subsidiaries is a party relating to the
issued or unissued capital stock or other equity interests of the Company or any
of its subsidiaries or obligating the Company or any of its subsidiaries to
grant, issue or sell any shares of capital stock, Company Voting Debt or other
equity interests of the Company or any of its subsidiaries. Except as set forth
in Section 2.03(c) of the Company Disclosure Schedule, there are no obligations,
contingent or otherwise, of the Company or any of its subsidiaries (i) to
repurchase, redeem or otherwise acquire any shares of capital stock or other
securities of the Company or the capital stock or other equity interests of any
subsidiary of the Company or (ii) (other than advances to wholly owned
subsidiaries in the ordinary course of business) to provide material funds to,
or to make any material investment in (in the form of a loan, capital
contribution or otherwise), or to provide any guarantee with respect to the
material obligations of, any subsidiary of the Company or any other person.
Except (i) as set forth in Section 2.03(c) of the Company Disclosure Schedule or
(ii) for subsidiaries of the Company set forth in Section 2.01 of the Company
Disclosure Schedule, neither the Company nor any of its subsidiaries (x)
directly or indirectly owns, (y) has agreed to purchase or otherwise acquire or
(z) holds any interest convertible into or exchangeable or exercisable for, any
capital stock or other equity interest of any corporation, partnership, joint
venture or other business association or entity. Except as set forth in Section
2.03(c) of the Company Disclosure Schedule or for any agreements, arrangements
or commitments between the Company and its wholly owned subsidiaries or between
such wholly owned subsidiaries, there are no agreements, arrangements or
commitments of any character (contingent or otherwise) pursuant to which any
person is or may be entitled to receive any payment based on, or calculated in
accordance with, the revenues or earnings of the Company or any of its
subsidiaries. Except as set forth in Section 2.03(c) of the Company Disclosure
Schedule, there are no voting trusts, proxies or other agreements or
understandings to which the Company or any of its subsidiaries is a party or by
which the Company or any of its subsidiaries is bound with respect to the voting
of any shares of capital stock or other equity interests of the Company or any
of its subsidiaries.

         2.04     AUTHORITY. The Company has all requisite corporate power and
authority to execute and deliver this Agreement, to perform its obligations
hereunder and to consummate the transactions contemplated hereby. The execution
and delivery of this Agreement by the Company and the consummation by the
Company of the transactions contemplated hereby have been duly authorized by all
necessary corporate action and no other corporate proceedings on the part of the
Company are necessary to authorize this Agreement or to consummate the
transactions contemplated hereby. This Agreement has been duly executed and
delivered by the Company and, assuming the due authorization, execution and
delivery hereof by each of the Acquiror Companies, constitutes the legal, valid
and binding obligation of the Company.

         2.05     NO CONFLICT; REQUIRED FILINGS AND CONSENTS.

                  (a) Assuming that all consents, licenses, permits, waivers,
approvals, authorizations, orders, filings and notifications contemplated by the
exceptions to Section 2.05(b) are obtained or made and except as disclosed in
Section 2.05(a) of the Company Disclosure Schedule, the execution and delivery
of this Agreement by the Company does not, and the 



                                      -8-
<PAGE>   14

performance by the Company of its obligations hereunder, including consummation
of the transactions contemplated hereby, will not (i) conflict with or violate
the Articles of Incorporation or Bylaws, or the equivalent organizational
documents, in each case as amended or restated, of the Company or any of its
subsidiaries, (ii) conflict with or violate any applicable Laws in effect as of
the date of this Agreement, or any judgment, order or decree applicable to the
Company or any of its subsidiaries or by or to which any of their respective
properties is bound or subject or (iii) result in any breach of or constitute a
default (or an event that with notice or lapse of time or both would become a
default) under, or give to others any rights of termination, amendment,
acceleration or cancellation of, or require payment under, or result in the
creation of a lien or encumbrance on any of the properties or assets of the
Company or any of its subsidiaries pursuant to, any note, bond, mortgage,
indenture, contract, agreement, lease, license, permit, franchise or other
instrument or obligation to which the Company or any of its subsidiaries is a
party or by or to which the Company or any of its subsidiaries or any of their
respective properties is bound or subject.

                  (b) The execution and delivery of this Agreement by the
Company does not, and the performance by the Company of its obligations
hereunder, including consummation of the transactions contemplated hereby, will
not, require the Company to obtain any consent, license, permit, waiver,
approval, authorization or order of, or to make any filing with or notification
to, any Governmental Entity (as hereinafter defined), except (i) the filing of
Articles of Merger with the Secretary of State of the State of Texas, (ii) the
applicable requirements of the Hart-Scott-Rodino Antitrust Improvements Act of
1976, as amended, and the rules and regulations promulgated thereunder (the "HSR
Act"), (iii) where the failure to obtain such consents, licenses, permits,
waivers, approvals, authorizations or orders, or to make such filings or
notifications could not reasonably be expected to cause a Company Material
Adverse Effect or to prevent the Company from performing its obligations under
this Agreement and (iv) as disclosed in Section 2.05(b) of the Company
Disclosure Schedule.

         2.06     PERMITS; COMPLIANCE. Except as disclosed in Section 2.06 of 
the Company Disclosure Schedule, each of the Company and its subsidiaries is in
possession of all (i) franchises, grants, authorizations, licenses, permits,
easements, variances, exemptions, consents, certificates, identification and
registration numbers, approvals and orders it reasonably believes are necessary
to own, lease and operate its properties and to carry on its business as it is
now being conducted (collectively, the "Company Permits"). Section 2.06 of the
Company Disclosure Schedule sets forth a list of each of the Company Permits and
the jurisdiction issuing the same, all of which are in good standing and not
subject to meritorious challenge. Section 2.06 of the Company Disclosure
Schedule also sets forth, as of the date of this Agreement, all actions,
proceedings, investigations or surveys pending or, to the knowledge of the
Company or the Shareholders, threatened against the Company or any of its
subsidiaries that could reasonably be expected to result in the loss, suspension
or revocation of a Company Permit. Except as set forth in Section 2.06 of the
Company Disclosure Schedule, neither the Company nor any of its subsidiaries is
in conflict with, in default under or in violation of , and none of them has
received, since July 31, 1997, from any Governmental Entity any written notice
with respect to any conflict with, default under or violation of, (i) any Law
applicable to the Company or any of its subsidiaries or by or to which any of
their respective properties is bound or subject, (ii) any judgment, order or
decree applicable to the Company or any of its


                                       -9-
<PAGE>   15

subsidiaries or by or to which any of their respective properties is bound or
subject, or (iii) any of the Company Permits.

         2.07     FINANCIAL STATEMENTS. The Company has provided Acquiror with 
true, correct and complete copies of its audited consolidated balance sheet,
income statement and statement of cash flows for the years ended July 31, 1995,
1996 and 1997 and an unaudited consolidated balance sheet, income statement and
statement of cash flows for the nine months ended April 30, 1998 (collectively,
the "Company Financial Statements"). Each of the Company Financial Statements
(including, in each case, any related notes thereto) (a) has been prepared in
accordance with GAAP applied on a consistent basis throughout the periods
involved (except (i) to the extent disclosed therein or required by changes in
GAAP, and (ii) as may be indicated in the notes thereto, and (b) fairly present
the consolidated financial position of the Company and its subsidiaries as of
the respective dates thereof and the consolidated results of operations and cash
flows for the periods indicated (subject, in the case of unaudited consolidated
financial statements for interim periods, to adjustments, consisting only of
normal, recurring accruals, necessary to present fairly such results of
operations and cash flows, and except for the absence of notes).

         2.08     ABSENCE OF CERTAIN CHANGES OR EVENTS. Except as contemplated 
by this Agreement or as set forth in Section 2.08 of the Company Disclosure
Schedule, since July 31, 1997 the Company and its subsidiaries have conducted
their respective businesses only in the ordinary course and in a manner
consistent with past practice and there has not been: (i) any damage,
destruction or loss with respect to any assets of the Company or any of its
subsidiaries that, whether or not covered by insurance, would constitute a
Company Material Adverse Effect; (ii) any change by the Company or its
subsidiaries in their significant accounting policies; (iii) except for
dividends by a wholly owned subsidiary of the Company to the Company or to
another wholly owned subsidiary of the Company, any declaration, setting aside
or payment of any dividends or distributions in respect of shares of Company
Stock or the shares of stock of, or other equity interests in, any subsidiary of
the Company or any redemption, purchase or other acquisition of any of the
Company's securities or any of the securities of any subsidiary of the Company;
(iv) any material increase in the benefits under, or the establishment or
amendment of, any bonus, insurance, severance, deferred compensation, pension,
retirement, profit sharing, performance awards (including, without limitation,
the granting of stock appreciation rights or restricted stock awards), stock
purchase or other employee benefit plan, or any increase in the compensation
payable or to become payable to any of the directors or officers of the Company
or the employees of the Company and its subsidiaries as a group; or (v) any
other Company Material Adverse Effect.

         2.09     LITIGATION. Except as disclosed in Section 2.09 of the Company
Disclosure Schedule, there is no claim, action, suit, litigation, proceeding,
arbitration or investigation of any kind, at law or in equity (including actions
or proceedings seeking injunctive relief), pending or, to the knowledge of the
Company or any of the Shareholders, threatened against the Company or any of its
subsidiaries or any properties or rights of the Company or any of its
subsidiaries, and neither the Company nor any of its subsidiaries is subject to
any executory judgment, order, writ, injunction, decree or award of any
Governmental Entity, including without limitation any cease and desist order and
any consent decree, settlement agreement or other similar written agreement with
any Governmental Entity.


                                      -10-
<PAGE>   16


         2.10     EMPLOYEE BENEFIT PLANS; LABOR MATTERS.

                  (a) Each Benefit Plan (as hereinafter defined) is listed in
Section 2.10(a) of the Company's Disclosure Schedule. The Company has delivered
or made available to Acquiror a true and correct copy of (i) the most recent
annual report (Form 5500) filed with the Internal Revenue Service (the "IRS")
for each Benefit Plan for which a Form 5500 is required to be filed, (ii) such
Benefit Plan, (iii) each trust agreement, if any, relating to such Benefit Plan,
(iv) the most recent summary plan description for each Benefit Plan for which a
summary plan description is required, (v) the most recent actuarial report or
valuation relating to a Benefit Plan subject to Title IV of the Employee
Retirement and Income Security Act of 1974, as amended ("ERISA"), and (vi) the
most recent determination letter, if any, issued by the IRS with respect to any
Benefit Plan qualified under section 401 of the Code. "Benefit Plans" shall mean
any employee pension benefit plan (whether or not insured), as defined in
Section 3(2) of ERISA, any employee welfare benefit plan (whether or not
insured) as defined in Section 3(1) of ERISA, any plans that would be employee
pension benefit plans or employee welfare benefit plans if they were subject to
ERISA, such as foreign plans and plans for directors, any stock bonus, stock
ownership, stock option, stock purchase, stock appreciation rights, phantom
stock, or other stock plan (whether qualified or nonqualified), and any bonus or
incentive compensation plan sponsored, maintained, or contributed to by the
Company or any of its subsidiaries for the benefit of any of the present or
former directors, officers, employees, agents, consultants, or other similar
representatives providing services to or for the Company or any of its
subsidiaries in connection with such services or any such plans which have been
so sponsored, maintained, or contributed to within six years prior to the date
of this Agreement; provided, however, that such term shall not include (x)
routine employment policies and procedures developed and applied in the ordinary
course of business and consistent with past practice, including wage, vacation,
holiday, and sick or other leave policies, (y) workers compensation insurance,
and (z) directors and officers liability insurance.

                  (b) With respect to each Benefit Plan, no event has occurred
and there exists no condition or set of circumstances in connection with which
the Company or any of its subsidiaries could be subject to any liability under
the terms of such Benefit Plan, ERISA, the Code, or any other applicable Law,
other than any condition or set of circumstances that could not reasonably be
expected to have a Company Material Adverse Effect.

                  (c) Each Benefit Plan intended to be qualified under section
401 of the Code (i) satisfies in form the requirements of such section except to
the extent amendments are not required by Law to be made until a date after the
Closing Date, (ii) has received a favorable determination letter from the IRS
regarding such qualified status, (iii) has not, since receipt of the most recent
favorable determination letter, been amended, and (iv) has not been operated in
a way that would adversely affect its qualified status.

                  (d) There has been no termination or partial termination of
any Benefit Plan within the meaning of section 411(d)(3) of the Code.


                                      -11-

<PAGE>   17

                  (e) There are no actions, suits, or claims pending (other than
routine claims for benefits) or, to the knowledge of the Company, threatened
against, or with respect to, any Benefit Plan or its assets that could
reasonably be expected to have a Company Material Adverse Effect.

                  (f) There is no matter pending (other than routine
qualification determination filings) with respect to any Benefit Plan before the
IRS, the United States Department of Labor, the Pension Benefit Guaranty
Corporation ("PBGC"), or other governmental authority.

                  (g) All contributions required to be made to Benefit Plans
pursuant to their terms and the provisions of ERISA, the Code, or any other
applicable Law have been timely made.

                  (h) With respect to each Benefit Plan, no event has occurred
and, to the knowledge of the Company or any of the Shareholders, there exists no
condition or set of circumstances in connection with which the Company or any of
its subsidiaries could be subject to any liability under the terms of such
Benefit Plans, ERISA, the Code or any other applicable Law.

                  (i) There are no collective bargaining or other labor union
contracts to which the Company or its subsidiaries is a party applicable to
persons employed by the Company or its subsidiaries and no collective bargaining
agreement is being negotiated by the Company or any of its subsidiaries. There
is no pending or, to the knowledge of the Company or the Shareholders,
threatened labor dispute, strike or work stoppage against the Company or any of
its subsidiaries. None of the Company, any of its subsidiaries or any of their
respective representatives or employees has committed any unfair labor practice
in connection with the operation of the respective businesses of the Company or
its subsidiaries that could reasonably be expected to have a Company Material
Adverse Effect, and there is no pending or, to the knowledge of the Company or
any of the Shareholders, threatened charge or complaint against the Company or
any of its subsidiaries by the National Labor Relations Board or any comparable
state agency.

                  (j) Section 2.10(j) of the Company Disclosure Schedule
contains true and correct (i) copies of all employment agreements to which the
Company or any of its subsidiaries is a party; (ii) listings of all officers of
the Company who have executed a non-competition agreement with the Company or
any of its subsidiaries; (iii) copies of all severance agreements, programs and
policies of the Company or any of its subsidiaries with or relating to its, or
any of its subsidiaries, employees; and (iv) summary descriptions of all plans,
programs, agreements and other arrangements of the Company or any of its
subsidiaries with or relating to its, or any of its subsidiaries, employees.
Except as set forth in Section 2.10(j) of the Company Disclosure Schedule,
neither the Company nor any of its subsidiaries will owe a severance payment or
similar obligation to any of their respective employees, officers or directors
as a result of the Merger or the other transactions contemplated by this
Agreement, and none of such persons will be entitled to severance payments or
other benefits as a result of the Merger or the other transactions contemplated
by this Agreement in the event of the subsequent termination of their
employment.

                  (k) No Benefit Plan provides retiree medical or retiree life
insurance benefits, and neither the Company nor any of its subsidiaries is
contractually or otherwise obligated (whether or not in writing) to provide life
insurance or medical benefits upon retirement or termination of 


                                      -12-
<PAGE>   18

employment of employees, other than as required by the provisions of Sections
601 through 608 of ERISA and section 4980B of the Code.

                  (l) Neither the Company nor any corporation, trade, business
or entity under common control with the Company, within the meaning of section
414(b), (c), (m) or (o) of the Code or Section 4001 of ERISA ("Commonly
Controlled Entity") contributes to or has an obligation to contribute to, and
has not within six years prior to the date of this Agreement contributed to or
had an obligation to contribute to, a multi-employer plan within the meaning of
Section 3(37) of ERISA or a plan subject to Title IV of ERISA.

                  (m) Neither the Company nor any Commonly Controlled Entity has
maintained a Benefit Plan which provides for the purchase of common stock of the
Company.

                  (n) The Company has not taken any of the following or other
similar actions since July 31, 1997: the acceleration of vesting, waiving of
performance criteria or the adjustment of awards or any other actions permitted
upon a change in control of the Company with respect to any of the Benefit Plans
or any of the plans, programs, agreements, policies or other arrangements
described in Section 2.10(j) of this Agreement.

                  (o) In connection with the consummation of the transactions
contemplated by this Agreement, no payments of money or other property,
acceleration of benefits, or provision of other rights have been or will be made
hereunder, under any agreement contemplated herein, or under any Benefit Plans
or any of the programs, agreements, policies, or other arrangements described in
Section 2.10(j) of the Company Disclosure Schedule that would be reasonably
likely to be nondeductible under section 280G of the Code, whether or not some
other subsequent action or event would be required to cause such payment,
acceleration, or provision to be triggered.

         2.11     TAXES.  Except as set forth in Section 2.11 of the Company 
Disclosure Schedule,

                  (a) (i) All returns and reports of or with respect to any Tax
which is required to be filed with respect to the Company or any its
subsidiaries on or prior to the date hereof ("Tax Return") have been duly and
timely filed, (ii) all items of income, gain, loss, deduction and credit or
other items required to be included in each such Tax Return have been so
included and all information provided in each such Tax Return is true, correct
and complete in all material respects, (iii) all Taxes required to be paid with
respect to the period covered by each such Tax Return have been timely paid in
full, (iv) all withholding Tax requirements imposed on or with respect to
Company or any of its subsidiaries have been satisfied in all material respects,
and (v) no penalty, interest or other charge is or will become due with respect
to the late filing of any such Tax Return or late payment of any such Tax.

                  (b) There is no claim against the Company or any of its
subsidiaries for Taxes, and no assessment, deficiency or adjustment has been
asserted or proposed with respect to any Tax Return of or with respect to the
Company or any of its subsidiaries other than those disclosed (and to which are
attached true and complete copies of all audit or similar reports) in Section
2.11 of the Company Disclosure Schedule.


                                      -13-

<PAGE>   19


                  (c) The total amounts set up as liabilities for current and
deferred Taxes in the Company Financial Statements are sufficient to cover the
payment of all Taxes, whether or not assessed or disputed, which are, or are
hereafter found to be, or to have been, due by or with respect to the Company
and any of its subsidiaries up to and through the periods covered thereby.

                  (d) Except for statutory liens for current Taxes not yet due,
no liens for Taxes exist upon any of the assets of the Company or any of its
subsidiaries.

                  (e) Neither the Company nor any of its subsidiaries has made
an election under section 341(f) of the Code.

         2.12     POOLING; TAX MATTERS.  None of the Company, its affiliates or
the Shareholders has taken or agreed to take any action that would prevent (a)
the Merger from being treated for financial accounting purposes as a "pooling of
interests" in accordance with GAAP and the rules, regulations and
interpretations (the "Regulations") of the Securities and Exchange Commission
(the "Commission") or (b) the Merger from constituting a reorganization within
the meaning of section 368(a) of the Code. Without limiting the generality of
the foregoing:

                  (a) Prior to and in connection with the Merger, (i) none of
         the Company Common Stock will be redeemed, (ii) no extraordinary
         distribution will be made with respect to Company Common Stock, and
         (iii) none of the Company Common Stock will be acquired by any person
         related (as defined in Treas. Reg. ss. 1.368-1(e)(3) without regard to
         ss. 1.368-1(e)(3)(i)(A)) to the Company.

                  (b) The Company and the Shareholders of the Company will each
         pay their respective expenses, if any, incurred in connection with the
         Merger.

                  (c) There is no intercorporate indebtedness existing between
         the Company and the Acquiror or between the Company and Acquisition Sub
         that was issued, acquired, or will be settled at a discount.

                  (d) The Company is not an investment company as defined in
         section 368(a)(2)(F)(iii) and (iv) of the Code.

                  (e) The Company is not under the jurisdiction of a court in a
         title 11 or similar case within the meaning of section 368(a)(3)(A) of
         the Code.

         2.13     AFFILIATES. Section 2.13 of the Company Disclosure Schedule
identifies all persons who, to the knowledge of the Company, may be deemed to be
affiliates of the Company within the meaning of that term as used in Rule 144
promulgated pursuant to the Securities Act of 1933, as amended (the "Securities
Act"), including, without limitation, all directors and executive officers of
the Company.

         2.14     CERTAIN BUSINESS PRACTICES. None of the Company, any of its
subsidiaries or any directors, officers, agents or employees of the Company or
any of its subsidiaries (in their capacities 



                                      -14-
<PAGE>   20

as such) has (i) used any funds for unlawful contributions, gifts, entertainment
or other unlawful purposes relating to political activity, (ii) made any
unlawful payment to foreign or domestic government officials or employees or to
foreign or domestic political parties or campaigns or violated any provision of
the Foreign Corrupt Practices Act of 1977, as amended, or (iii) made any other
unlawful payment.

         2.15     ENVIRONMENTAL. Except as set forth in Section 2.15 of the 
Company Disclosure Schedule, the Company and each of its subsidiaries is in full
compliance with all laws, rules, regulations, orders, judgments, decrees and
other legal requirements, foreign and domestic, relating to the prevention of
pollution and the protection of the environment, including, without limitation,
all such legal requirements pertaining to human health and safety (collectively,
"Environmental Laws"). Except as set forth in Section 2.15 of the Company
Disclosure Schedule, there is no physical condition existing on any property
ever owned, operated, leased or used by the Company or any of its subsidiaries
nor are there any physical conditions existing on any other property that may
have been impacted by the operations of the Company or any of its subsidiaries
that could give rise to any remedial obligation under any Environmental Laws or
that could result in any liability to any third party claiming damage to person
or property as a result or consequence of such physical conditions. Except as
set forth in Section 2.15 of the Company Disclosure Schedule, none of the
Company or any of its subsidiaries has caused or permitted its businesses,
properties or assets to be used to generate, manufacture, refine, transport,
treat, store, handle, dispose of, transfer, produce, or process any Hazardous
Substance (as defined below) except in compliance with all Environmental Laws,
and has not caused or permitted the Release (as defined below) or arrangement
for transport or disposal of any Hazardous Substance on or off the site of any
property of any of the Company or any of its subsidiaries. Except as set forth
in Section 2.15 of the Company Disclosure Schedule, there are no underground
storage tanks on, under, or about any property of the Company or any of its
subsidiaries, and to the knowledge of the Company and the Shareholders, no
underground storage tanks were previously located on such properties. The
Company does not know of, and has not received any written or oral notice or
other communications from any Governmental Entity or other third party relating
to Hazardous Substances or remediation thereof, of possible liability of or
enforcement against any person or entity pursuant to any Environmental Law,
other environmental conditions in connection with properties of the Company or
any of its subsidiaries, or any actual or potential administrative or judicial
proceedings in connection with any of the foregoing. The term "Hazardous
Substance" shall mean, without limitation, any hazardous waste, as defined by 42
U.S.C. 6903(5), any hazardous substance, as defined by 42 U.S.C. 9601(14), any
pollutant or contaminant, as defined by 42 U.S.C. 9601(33), asbestos or
asbestos-containing materials, polychlorinated biphenyls, radon, crude oil or
derivatives thereof, petroleum products, and all other toxic substances,
hazardous materials or chemical substances regulated by any Environmental Law.
The term "Release" shall have the meaning set forth in 42 U.S.C. 9601(22).

         2.16     UNDISCLOSED LIABILITIES. Except (i) as and to the extent of 
the amounts specifically reflected or accrued for in the balance sheet dated as
of April 30, 1998, included in the Company Financial Statements, (ii) for
liabilities or obligations incurred in the ordinary course of business since
such balance sheet date, or (iii) as set forth in Section 2.16 of the Company
Disclosure Schedule, none of the Company or any of its subsidiaries has any
liabilities or obligations of any nature whether absolute, accrued, contingent
or otherwise, and whether due or to become due. 



                                      -15-
<PAGE>   21

Neither the Company nor any of the Shareholders knows of any basis for the
assertion against the Company or any of its subsidiaries of any liability or
obligation not excepted by the preceding clauses (i) through (iii) of this
Section.

         2.17     CERTAIN AGREEMENTS. Except as set forth in Section 2.17 of the
Company Disclosure Schedule, none of the Company or any of its subsidiaries is a
party to, or bound by, any contract, agreement or organizational document which
purports to restrict, by virtue of a noncompetition, territorial exclusivity or
other provision covering such subject matter, the scope of the business or
operations of any of the Company or any of its subsidiaries geographically or
otherwise.

         2.18     CONTRACTS AND COMMITMENTS. Section 2.18 of the Company 
Disclosure Schedule sets forth (i) a list of each contract or commitment to
which the Company or any of its subsidiaries is a party or by which its or their
property is bound that involves consideration or other expenditure in excess of
$25,000 or performance over a period of more than six months or that is
otherwise material to the business or operations of the Company and its
subsidiaries, taken as a whole ("Material Contracts"); (ii) a list of all real
or personal property leases to which any of the Company or any of its
subsidiaries is a party involving consideration or other expenditure in excess
of $25,000 over the term of the lease ("Material Leases"); (iii) a list of
guarantees, or agreements to indemnify or be contingently liable for, the
payment or performance by any person or business entity to which any of the
Company or any of its subsidiaries is a party ("Guarantees"); and (iv) a list of
contracts or other formal or informal understandings between the Company or any
of its subsidiaries and any of its officers, directors, employees, consultants,
agents or shareholders (or any of such shareholders' family members or
affiliates) ("Affiliate Agreements"). True and complete copies of each Material
Contract, Material Lease, Guarantee and Affiliate Agreement has been furnished
to Acquiror prior to the date hereof. Except as specifically disclosed in
Section 2.18 of the Company Disclosure Schedule, each of the Material Contracts,
Material Leases, Guarantees and Affiliate Agreements constitutes the valid and
legally binding obligation of the parties thereto and is in full force and
effect without default on the part of the Company, and to the knowledge of the
Company and the Shareholders, any other party thereto.

         2.19     AFFILIATE INTERESTS. None of the Shareholders nor any 
employee, consultant, officer or director, or former shareholder, employee,
consultant, officer or director, of the Company or any of its subsidiaries has
any interest, direct or indirect, in any property, tangible, or intangible,
including, without limitation, patents, trade secrets, other confidential
business information, trademarks, service marks or trade names used in or
pertaining to the business of the Company or any of its subsidiaries, except for
the normal rights of a shareholder and as set forth in Section 2.19 of the
Company Disclosure Schedule.

         2.20 INTELLECTUAL PROPERTY. The Company or one or more of its
subsidiaries own, or hold licenses under or otherwise have the right to use or
sublicense, all foreign and domestic patents, trademarks (common law and
registered), trademark registration applications, service marks (common law and
registered), service mark registration applications, trade names and copyrights,
copyright applications, trade secrets, know-how and other proprietary
information as it reasonably believes are necessary for the conduct of the
business of the Company and its subsidiaries as currently conducted. A list of
all such intellectual property is set forth in Section 2.20 of the


                                      -16-

<PAGE>   22

Company Disclosure Schedule. Neither the Company nor any of its subsidiaries is
currently in receipt of any notice of infringement or notice of conflict with
the asserted rights of others in any patents, trademarks, service marks, trade
names, trade secrets and copyrights owned or held by other persons, except, in
each case, for matters that could not reasonably be expected to have a Company
Material Adverse Effect. Neither the execution and delivery of this Agreement
nor the consummation of the transactions contemplated hereby will violate or
breach the terms of or cause any cancellation of any material license held by
the Company or any of its subsidiaries under, any patent, trademark, service
mark, trade name, trade secret or copyright.

         2.21     BROKERS. No broker, finder or investment banker is entitled to
any brokerage, finder's or other fee or commission in connection with the
transactions contemplated by this Agreement based upon arrangements made by or
on behalf of the Company or any of the Shareholders.

         2.22     INSURANCE. Section 2.22 of the Company Disclosure Schedule 
sets forth a list of all policies of insurance currently in effect relating to
the business or operations of the Company and its subsidiaries (true and
complete copies of which have been furnished to Acquiror). Such insurance
policies are in full force and effect. The Company and each of its subsidiaries
are presently insured, and during each of the past five (5) calendar years have
been insured, against such risks as companies engaged in a similar business
would, in accordance with good business practice, customarily be insured. Except
as set forth in Section 2.22 of the Company Disclosure Schedule, the policies of
general liability, malpractice or professional liability, fire, theft and other
insurance maintained with respect to the operations, assets or businesses of the
Company and its subsidiaries provide what the Company reasonably believes to be
adequate coverage against loss. The Company or its subsidiaries have given in a
timely manner to their insurers all notices required to be given under such
insurance policies with respect to all claims and actions covered by insurance,
and no insurer has denied coverage of any such claims or actions or reserved it
rights in respect of or rejected any of such claims. None of the Company or any
of its subsidiaries has received any notice or other communication from any such
insurer canceling or materially amending any of such insurance policies, and no
such cancellation is pending or, to the knowledge of the Company, threatened.

         2.23     PROPERTIES. Except as set forth in Section 2.23 of the Company
Disclosure Schedule, the Company and its subsidiaries have good and marketable
title, free and clear of all liens to all their material properties and assets
whether tangible or intangible, real, personal or mixed, reflected in the
Company Financial Statements as being owned by the Company and its subsidiaries,
as of the date thereof, other than (i) any properties or assets that have been
sold or otherwise disposed of in the ordinary course of business since the date
of such Company Financial Statements, (ii) liens disclosed in the notes to such
financial statements, (iii) statutory liens for current Taxes not yet due and
(iv) liens arising in the ordinary course of business. All buildings, and all
fixtures, equipment and other property and assets that are material to its
business on a consolidated basis, held under leases or subleases by the Company
or any of its subsidiaries are held under valid instruments enforceable in
accordance with their respective terms, subject to applicable Laws of
bankruptcy, insolvency or similar Laws relating to creditors' rights generally
and to general principles of equity (whether applied in a proceeding in law or
equity). All of the Company's and its subsidiaries' equipment in regular use has
been reasonably maintained and is in serviceable condition, reasonable wear and
tear



                                      -17-
<PAGE>   23

excepted. Prior to the Closing, the real property identified in Section 5.01(f)
of the Company Disclosure Schedule (the "Real Property") was transferred by the
Company to Silver Stone Properties, LLC and a promissory note was issued from
Silver Stone Properties, LLC to the Company in the amount of the indebtedness
encumbering such Real Property.

         2.24     GOOD TITLE. Each of the Shareholders is the sole record and
beneficial owner of, and has good and valid title to, the number of shares of
Company Stock set forth opposite such Shareholder's name on Schedule 1.06(a) to
this Agreement, free and clear of all liens, claims, encumbrances, options,
voting trusts or agreements, proxies or other claims or charges of any nature
whatsoever (other than resulting from this Agreement).

         2.25     CERTAIN SECURITIES LAW MATTERS.

                  (a) Each of the Shareholders, either alone or with his
purchaser representative as defined in Rule 501(h) under the Securities Act, if
any, has substantial experience in evaluating and investing in private placement
transactions so that such Shareholder is capable of evaluating the merits and
risks of its investment in the Acquiror Shares. Each of the Shareholders, by
reason of such Shareholder's business or financial experience, either alone or
with his purchaser representative as defined in Section 501(h) under the
Securities Act, if any, has the capacity to protect such Shareholder's own
interests in connection with the acquisition of the Acquiror Shares hereunder.
Each of the Shareholders who has designated himself, herself or itself, as the
case may be, (i) as an "accredited investor" on the signature page hereto is an
"accredited investor" as defined in Rule 501 of Regulation D promulgated
pursuant to the Securities Act or (ii) as a "nonaccredited investor" is not an
"accredited investor" and, either alone or with his purchaser representatives,
has such knowledge and experience in financial and business matters that he is
capable of evaluating the merits and risks of the transactions contemplated by
this Agreement. Acquiror has provided each of the Shareholders or his purchaser
representative, if any, with copies of the Acquiror SEC Reports (as such term is
defined in Section 3.05). Each of the Shareholders or his purchaser
representative, if any, is familiar with the business and financial condition,
properties, operations and prospects of Acquiror and has had an opportunity to
discuss Acquiror's business and financial condition, properties, operations and
prospects with Acquiror's management. Each of the Shareholders or his purchaser
representative, if any, has also had an opportunity to ask questions of officers
of Acquiror, which questions were answered to such Shareholder's satisfaction.
Each of the Shareholders understands that such discussion was intended to
describe certain aspects of Acquiror's business and financial condition,
properties, operations and prospects, but were not a thorough or exhaustive
description.

                  (b) Each of the Shareholders understands that the Acquiror
Shares may be "restricted securities" under the applicable federal securities
laws and that the Securities Act and the rules of the Commission provide in
substance that such Shareholder may dispose of the Acquiror Shares only pursuant
to an effective registration statement under the Securities Act or an exemption
therefrom, and each Shareholder further understands that, except to the limited
extent provided in the Registration Rights Agreement (as hereinafter defined)
and in this section below, Acquiror has no obligation or intention to register
the Acquiror Shares, or to take action so as to permit sales pursuant to the
Securities Act (including Rule 144) thereunder which permits limited resales of




                                      -18-
<PAGE>   24

shares purchased in a private placement subject to the satisfaction of certain
conditions, including, among other things, the existence of a public market for
the shares, the availability of certain current public information about the
issue, the resale occurring not less than one (1) year after a party has
purchased and paid for the security to be sold, the sale being effected through
a "broker's transaction" or in transactions with a "market maker" and the number
of shares being sold not exceeding specified limitations. Accordingly, such
Shareholder understands that under the Commission's rules, such Shareholder may
dispose of the Acquiror Shares in transactions which are exempt from
registration under the Securities Act. As a consequence of all of the foregoing,
each Shareholder understands that such Shareholder must bear the economic risk
of the investment in the Acquiror Shares for an indefinite period of time.
Notwithstanding the foregoing, Acquiror agrees that:

                  (i) For so long as and to the extent necessary to permit the
         Shareholders to sell the Acquiror Shares pursuant to Rules 144 or 145
         promulgated under the Securities Act, Acquiror shall (a) use its
         reasonable efforts to (x) file on a timely basis all reports, data and
         other information required to be filed with the Commission by it
         pursuant to the Securities Exchange Act of 1934, as amended (the
         "Exchange Act"), and (y) to furnish any Shareholder upon request a
         written statement confirming that Acquiror has complied with such
         reporting requirements during the twelve (12) months preceding any
         proposed sale of the Acquiror Shares by any such Shareholder under
         Rules 144 or 145, Acquiror has filed all reports, data and other
         information required to be filed with the Commission by it under the
         Exchange Act during the twelve (12) months preceding the date of this
         Agreement.

                  (ii) The legends set forth on the certificates representing
         the Acquiror Shares shall be removed by delivery of substitute
         certificates without such legend, if such legend is not required for
         purposes of the Securities Act or this Agreement. It is agreed that
         such restrictive legends and related stop orders will be removed if (x)
         Acquiror has received either a written opinion of counsel, which such
         counsel and opinion shall be reasonably satisfactory to Acquiror, or a
         "no action" letter obtained from the Commission, to the effect that the
         Acquiror Shares subject thereto may be transferred free of the
         restrictions imposed by Rules 144 or 145, or (y) in the event of a sale
         of the Acquiror Shares which has been registered under the Securities
         Act or made in conformity with the provisions of Rules 144 or 145.

                  (c) Each of the Shareholders acknowledges and agrees that such
Shareholder is not relying upon Acquiror or the Company or their respective
officers, directors, employees or agents, as to the United States federal income
tax or any other tax consequences to such Shareholder of the transactions
contemplated by this Agreement. As to all such tax consequences, such
Shareholder hereby agrees and represents that such Shareholder has consulted
with such Shareholder's own legal and tax advisors to the extent that such
Shareholder has deemed such consultation necessary or appropriate, that such
Shareholder is making such Shareholder's own determination as to what the tax
consequences of the transactions contemplated hereby will be to such Shareholder
and that neither Acquiror nor the Company is making any representation, express
or implied, as to any such tax consequences.

                                      -19-
<PAGE>   25

         2.26     AUTHORIZATION AND VALIDITY OF AGREEMENT. Each of the 
Shareholders has the full power, legal right, capacity and authority to enter
into, execute and deliver this Agreement and to carry out and perform the
transactions contemplated hereby. This Agreement constitutes a valid and binding
obligation of such Shareholder, enforceable against such Shareholder in
accordance with its terms.

                                   ARTICLE III

                   REPRESENTATIONS AND WARRANTIES OF ACQUIROR

         Acquiror hereby represents and warrants to the Company and the
Shareholders that:

         3.01     ORGANIZATION AND QUALIFICATION. Acquiror is a limited 
liability company duly organized, validly existing and in good standing under
the laws of The Netherlands and Acquisition Sub is a corporation duly organized,
validly existing and in good standing under the Laws of the State of Texas. Each
of the Acquiror Companies has all requisite power and authority to own, lease
and operate its properties and to carry on its business as it is now being
conducted and is duly qualified and in good standing to do business in each
jurisdiction in which the nature of the business conducted by it or the
ownership or leasing of its properties makes such qualification necessary, other
than where the failure to be so duly qualified and in good standing could not
reasonably be expected to have an Acquiror Material Adverse Effect. The term
"Acquiror Material Adverse Effect" as used in this Agreement shall mean any
change or effect that would be materially adverse to the financial condition,
results of operations, business or prospects of Acquiror and its subsidiaries,
taken as a whole, at the time of such change or effect.

         3.02     CAPITALIZATION.

                  (a) The authorized capital stock of Acquiror consists of (i)
100,000,000 Acquiror Shares, of which, as of May 31, 1998: (A) 24,884,167 are
issued and outstanding, all of which are duly authorized, validly issued, fully
paid and nonassessable and were not issued in violation of any preemptive or
similar rights created by statute, Acquiror's Articles of Association or Bylaws
(or the equivalent organizational documents) (collectively, the "Acquiror
Organizational Documents") or any agreement to which Acquiror is a party or is
bound; (B) no shares are held in the treasury of Acquiror and (C) 1,785,000
shares are reserved for future issuance pursuant to stock option plans of
Acquiror and (ii) 3,000,000 Preference Shares, par value NLG 0.03, none of which
were issued or outstanding. The authorized capital stock of Acquisition Sub
consists of 1,000 shares of common stock, par value $.01 per share, of which, as
of the date hereof, 1,000 shares are issued and outstanding. All of the issued
and outstanding capital stock of Acquisition Sub is owned by Core Laboratories,
Inc., a wholly-owned subsidiary of Acquiror.

                  (b) The Acquiror Shares to be issued pursuant to the Merger
will be duly authorized, validly issued, fully paid and nonassessable.


                                      -20-
<PAGE>   26

                  (c) There are no voting trusts or other agreements or
understandings to which Acquiror or any of its subsidiaries is a party with
respect to the voting of the capital stock of Acquiror or any of its
subsidiaries.

         3.03     AUTHORITY. Each of the Acquiror Companies has all requisite
corporate power and authority to execute and deliver this Agreement, to perform
its obligations hereunder and to consummate the transactions contemplated
hereby. The execution and delivery of this Agreement by the Acquiror Companies
and the performance by each of the Acquiror Companies of its obligations
hereunder, including the consummation of the transactions contemplated hereby,
have been duly authorized by all necessary corporate action and no other
corporate proceedings on the part of either of the Acquiror Companies are
necessary to authorize this Agreement or to consummate the transactions
contemplated hereby. This Agreement has been duly executed and delivered by each
of the Acquiror Companies and, assuming the due authorization, execution and
delivery hereof by the other parties hereto, constitutes the legal, valid and
binding obligation of each of the Acquiror Companies.

         3.04     NO CONFLICT; REQUIRED FILINGS AND CONSENTS.

                  (a) Assuming that all consents, licenses, permits, waivers,
approvals, authorizations, orders, filings and notifications contemplated by the
exceptions to Section 3.04(b) are obtained or made and except as otherwise
disclosed in Section 3.04(a) of the Disclosure Schedule delivered by Acquiror to
the Company contemporaneously with the execution and delivery of this Agreement
(the "Acquiror Disclosure Schedule"), the execution and delivery of this
Agreement by the Acquiror Companies does not, and performance of their
respective obligations hereunder, including the consummation of the transactions
contemplated hereby, will not (with or without notice or lapse of time or both)
(i) conflict with or violate the Acquiror Organizational Documents or the
Articles of Incorporation or Bylaws of Acquisition Sub, (ii) conflict with or
violate any Laws in effect as of the date of this Agreement or any judgment,
order or decree applicable to Acquiror or any of Acquiror's subsidiaries or by
or to which any of their properties is bound or subject or (iii) result in any
breach of or constitute a default under, or give to others any rights of
termination, amendment, acceleration or cancellation of, or require payment
under, or result in the creation of a lien or encumbrance on any of the
properties or assets of Acquiror or any of Acquiror's subsidiaries pursuant to,
any note, bond, mortgage, indenture, contract, agreement, lease, license,
permit, franchise or other instrument or obligation to which Acquiror or any of
Acquiror's subsidiaries is a party or by or to which Acquiror or any of
Acquiror's subsidiaries or any of their respective properties is bound or
subject.

                  (b) The execution and delivery of this Agreement by the
Acquiror Companies does not, and the performance of this Agreement by the
Acquiror Companies, including the consummation of the transactions contemplated
hereby, will not require Acquiror or Acquisition Sub to obtain any consent,
license, permit, waiver approval, authorization or order of, or to make any
filing with or notification to, any Governmental Entities, except (i) for the
filing of Articles of Merger with the Secretary of State of the State of Texas,
(ii) the applicable requirements of the HSR Act, (iii) the applicable
requirements of the Exchange Act and the National Association of Securities
Dealers, Inc. (the "NASD"), (iv) where the failure to obtain such consents,
licenses, permits,



                                      -21-

<PAGE>   27

waivers, approvals, authorizations or orders, or to make such filings or
notifications could not reasonably be expected to prevent Acquiror or
Acquisition Sub from performing their respective obligations under this
Agreement and (v) as disclosed in Section 3.04(b) of the Acquiror Disclosure
Schedule.

         3.05     REPORTS; FINANCIAL STATEMENTS.

                  (a) Since December 31, 1997, Acquiror has filed all forms,
reports, statements and other documents required to be filed with the
Commission, including without limitation (i) all Annual Reports on Form 10-K,
(ii) all Quarterly Reports on Form 10-Q, (iii) all proxy statements relating to
meetings of shareholders (whether annual or special), (iv) all Current Reports
on Form 8- K and (v) all other reports, schedules, registration statements or
other documents (collectively referred to as the "Acquiror SEC Reports"). The
Acquiror SEC Reports were prepared in all material respects in accordance with
the requirements of applicable Law (including the Securities Act or the Exchange
Act, as the case may be, and the rules and regulations of the Commission
thereunder applicable to the Acquiror SEC Reports) and the Acquiror SEC Reports
did not at the time they were filed contain any untrue statement of a material
fact or omit to state a material fact required to be stated therein or necessary
in order to make the statements therein, in the light of the circumstances under
which they were made, not misleading. Acquiror has provided the Shareholders
with true and complete copies of all Acquiror SEC Reports.

                  (b) Each of the historical consolidated financial statements
(including, in each case, any related notes thereto) contained in the Acquiror
SEC Reports (i) have been prepared in accordance with the published rules and
regulations of the Commission and GAAP applied on a consistent basis throughout
the periods involved (except (A) to the extent disclosed therein or required by
changes in GAAP, (B) as may be indicated in the notes thereto and (C) in the
case of the unaudited financial statements, as permitted by the rules and
regulations of the Commission) and (ii) fairly present the consolidated
financial position of Acquiror and its subsidiaries as of the respective dates
thereof and the consolidated results of operations and cash flows for the
periods indicated (subject, in the case of unaudited consolidated financial
statements for interim periods, to adjustments, consisting only of normal,
recurring accruals, necessary to present fairly such results of operations and
cash flows).

         3.06     ABSENCE OF CERTAIN CHANGES OR EVENTS. Except as disclosed in 
the Acquiror SEC Reports filed prior to the date of this Agreement or as
contemplated by this Agreement, since December 31, 1997, Acquiror and its
subsidiaries have conducted their respective businesses only in the ordinary
course and in a manner consistent with past practice and there has not been any
Acquiror Material Adverse Effect.

         3.07     POOLING; TAX MATTERS. Neither the Acquiror nor any of its
affiliates has taken or agreed to take any action that would prevent (a) the
Merger from being treated for financial accounting purposes as a "pooling of
interests" in accordance with GAAP and the Regulations of the Commission or (b)
the Merger from constituting a reorganization within the meaning of section
368(a) of the Code.


                                      -22-
<PAGE>   28

         3.08     BROKERS. No broker, finder or investment banker is entitled to
any brokerage, finder's or other fee or commission in connection with the
transactions contemplated by this Agreement based upon arrangements made by or
on behalf of Acquiror.

                                   ARTICLE IV

                          COVENANTS OF THE SHAREHOLDERS

         4.01     AFFIRMATIVE COVENANT. Each of the Shareholders covenants and
agrees that, prior to the Closing Date, such Shareholder will take all
commercially reasonable actions necessary to ensure that the Company complies
with Articles V and VII hereof.

         4.02     NEGATIVE COVENANTS.  Each of the Shareholders covenants and 
agrees that, prior to the Effective Time, such Shareholder will not:

                  (a) take any action that reasonably could be expected to
         result in (i) any of the representations and warranties of such
         Shareholder and the Company set forth in Article II hereof becoming
         untrue or (ii) any of the conditions set forth in Article IX hereof not
         being satisfied; or

                  (b) initiate, solicit or encourage (including by way of
         furnishing information or assistance), or take any other action to
         facilitate, any inquiries or the making of any proposal relating to, or
         that may reasonably be expected to lead to, any Competing Transaction
         (as hereinafter defined), or enter into discussions or negotiate with
         any person or entity in furtherance of such inquiries or to obtain a
         Competing Transaction, or agree to, or endorse, any Competing
         Transaction, or authorize or permit any agent, investment banker,
         financial advisor, attorney, accountant or other representative
         retained by such Shareholder to take any such action, and such
         Shareholder shall promptly notify Acquiror of all relevant terms of any
         such inquiries or proposals received by such Shareholder or by any such
         agent, investment banker, financial advisor, attorney, accountant or
         other representative relating to any of such matters and if such
         inquiry or proposal is in writing, such Shareholder shall promptly
         deliver or cause to be delivered to Acquiror a copy of such inquiry or
         proposal. For purposes of this Agreement, "Competing Transaction" shall
         mean any merger, consolidation, share exchange, business combination or
         similar transaction involving the Company or any of its subsidiaries or
         the acquisition in any manner, directly or indirectly, of a material
         interest in any voting securities of, or a material equity interest in
         a substantial portion of the assets of, the Company or any of its
         subsidiaries, other than the transactions contemplated by this
         Agreement.

         4.03     REPLACEMENT OF PROMISSORY NOTE. On or prior to six (6) months
after the Closing Date, the Shareholders shall repay the promissory note issued
in favor of the Company from Silver Stone Properties, LLC in connection with the
sale of the Real Property.


                                      -23-
<PAGE>   29


                                    ARTICLE V

                            COVENANTS OF THE COMPANY

         5.01     AFFIRMATIVE COVENANTS OF THE COMPANY. The Company hereby 
covenants and agrees that, prior to the Effective Time, unless otherwise
expressly contemplated by this Agreement or consented to in writing by Acquiror,
the Company will and will cause each of its subsidiaries to:

                  (a) operate its business in the usual and ordinary course
         consistent with past practices;

                  (b) use all reasonable efforts to preserve substantially
         intact its business organization, maintain its rights and franchises,
         retain the services of its respective officers and key employees and
         maintain its relationships with its respective customers and suppliers;

                  (c) maintain and keep its properties and assets in as good
         repair and condition as at present, ordinary wear and tear excepted,
         and maintain supplies and inventories in quantities consistent with its
         customary business practice;

                  (d) use all reasonable efforts to keep in full force and
         effect insurance and bonds comparable in amount and scope of coverage
         to that currently maintained;

                  (e) ensure that the cash on hand at the Company shall not be
         less than $580,646.18 and the aggregate outstanding balance of
         long-term and short-term debt shall not be greater than $7,717,953.00.

                  (f) execute any additional documents and instruments necessary
         to effectively transfer the Real Property described in Section 5.01(f)
         of the Company Disclosure Schedule to Silver Stone Properties, LLC and
         to evidence assumption of the underlying indebtedness encumbering such
         Real Property;

                  (g) use its best efforts to ensure that the Shareholders'
         Representative shall execute and deliver the Escrow Agreement; and

                  (h) execute a lease arrangement (the "Lease") covering the
         Real Property, in substantially the form attached hereto as Exhibit E.

         5.02     NEGATIVE COVENANTS OF THE COMPANY. Except as expressly
contemplated by this Agreement or otherwise consented to in writing by Acquiror,
from the date of this Agreement until the Effective Time, the Company will not
do, and will not permit any of its subsidiaries to do, any of the following:

                  (a) (i) increase the compensation payable to or to become
         payable to any director or executive officer; (ii) increase the
         compensation payable or pay bonuses to employees of the Company
         (excluding payments made pursuant to agreements disclosed in Section
         2.10(j)


                                      -24-
<PAGE>   30

         of the Company Disclosure Schedule) other than in the ordinary course
         of business, (iii) grant any severance or termination pay (other than
         pursuant to the normal severance practices of the Company or its
         subsidiaries as in effect on the date of this Agreement) to, or enter
         into any employment or severance agreement with, any director, officer
         or employee; (iv) except as set forth in Section 2.10(a) of the Company
         Disclosure Schedule, establish, adopt or enter into any Benefit Plan or
         (v) except as may be required by applicable Law or as set forth in
         Section 2.10(a) of the Company Disclosure Schedule, amend, or take any
         other actions (including, without limitation, the acceleration of
         vesting, waiving of performance criteria or the adjustment of awards or
         any other actions permitted upon a "change in control" (as defined in
         the respective plans) of the Company, with respect to any of the
         Benefit Plans or any of the plans, programs, agreements, policies or
         other arrangements described in Section 2.10(a) of this Agreement;

                  (b) declare or pay any dividend on, or make any other
         distribution in respect of, outstanding shares of capital stock or
         other equity interests, except dividends by a wholly owned subsidiary
         of the Company to the Company or another wholly owned subsidiary of the
         Company;

                  (c) (i) except as described in Section 2.03(c) of the Company
         Disclosure Schedule, redeem, purchase or otherwise acquire any shares
         of its or any of its subsidiaries' capital stock or any securities or
         obligations convertible into or exchangeable for any shares of its or
         its subsidiaries' capital stock (other than any such acquisition
         directly from any wholly owned subsidiary of the Company in exchange
         for capital contributions or loans to such subsidiary), or any options,
         warrants or conversion or other rights to acquire any shares of its or
         its subsidiaries' capital stock or any such securities or obligations;
         (ii) effect any reorganization or recapitalization of the Company or
         any of its subsidiaries; or (iii) split, combine or reclassify any of
         its or its subsidiaries' capital stock or issue or authorize or propose
         the issuance of any other securities in respect of, in lieu of or in
         substitution for, shares of its or its subsidiaries' capital stock;

                  (d) (i) except as set forth in Section 2.03(a) hereof or as
         described in Section 2.03(c) of the Company Disclosure Schedule, issue
         (whether upon original issue or out of treasury), sell, grant, award,
         deliver or limit the voting rights of any shares of any class of its or
         its subsidiaries' capital stock, any securities convertible into or
         exercisable or exchangeable for any such shares, or any rights,
         warrants or options to acquire, any such shares; (ii) amend or
         otherwise modify the terms of any such rights, warrants or options the
         effect of which shall be to make such terms materially more favorable
         to the holders thereof; or (iii) take any action to accelerate the
         vesting of any of the stock options;

                  (e) acquire or agree to acquire, by merging or consolidating
         with, by purchasing an equity interest in or a portion of the assets
         of, or by any other manner, any business or any corporation,
         partnership, association or other business organization or division
         thereof, or otherwise acquire or agree to acquire any assets of any
         other person (other than the purchase of assets from suppliers or
         vendors in the ordinary course of business and consistent with past
         practice), except that the Company may continue negotiations with and,
         subject to the


                                      -25-
<PAGE>   31

         prior approval of Acquiror, consummate the acquisition of Explosivos
         Tecnologicos Argentinos, S.A. presently being negotiated;

                  (f) sell, lease, exchange, mortgage, pledge, transfer or
         otherwise dispose of, or agree to sell, lease, exchange, mortgage,
         pledge, transfer or otherwise dispose of, any of its assets or any
         assets of any of its subsidiaries, except for pledges or dispositions
         of assets in the ordinary course of business and consistent with past
         practice;

                  (g) initiate, solicit or encourage (including by way of
         furnishing information or assistance), or take any other action to
         facilitate, any inquiries or the making of any proposal relating to, or
         that may reasonably be expected to lead to, any Competing Transaction,
         or enter into discussions or negotiate with any person or entity in
         furtherance of such inquiries or to obtain a Competing Transaction, or
         agree to, or endorse, any Competing Transaction, or authorize or permit
         any of the officers, directors, employees or agents of the Company or
         any of its subsidiaries or any agent, investment banker, financial
         advisor, attorney, accountant or other representative retained by the
         Company or any of the Company's subsidiaries to take any such action,
         and the Company shall promptly notify Acquiror of all relevant terms of
         any such inquiries or proposals received by the Company or any of its
         subsidiaries or by any such officer, director, employee, agent,
         investment banker, financial advisor, attorney, accountant or other
         representative relating to any of such matters and if such inquiry or
         proposal is in writing, the Company shall promptly deliver or cause to
         be delivered to Acquiror a copy of such inquiry or proposal;

                  (h) release any third party from its obligations under any
         existing standstill agreement or arrangement relating to a Competing
         Transaction or otherwise under any confidentiality or other similar
         agreement relating to information material to the Company or any of its
         subsidiaries;

                  (i) propose to adopt any amendments to its Articles of
         Incorporation or its Bylaws that would have an adverse effect on the
         consummation of the transactions contemplated by this Agreement;

                  (j) (i) change any of its significant accounting policies or
         (ii) make or rescind any express or deemed election relating to Taxes,
         settle or compromise any material claim, action, suit, litigation,
         proceeding, arbitration, investigation, audit or controversy relating
         to Taxes, or change any of its methods of reporting income or
         deductions for federal income tax purposes from those employed in the
         preparation of the federal income tax returns for the taxable year
         ending July 31, 1997, except, in the case of clause (i) or clause (ii),
         as may be required by Law or GAAP;

                  (k) incur any obligation for borrowed money or purchase money
         indebtedness, whether or not evidenced by a note, bond, debenture or
         similar instrument or under any financing lease, whether pursuant to a
         sale-and-leaseback transaction or otherwise, except in the ordinary
         course of business consistent with past practice;



                                      -26-

<PAGE>   32

                  (l) enter into any material arrangement, agreement or contract
         with any third party (other than customers in the ordinary course of
         business); or

                  (m) agree in writing or otherwise to do any of the foregoing.

                                   ARTICLE VI

                              COVENANTS OF ACQUIROR

         6.01     AFFIRMATIVE COVENANTS OF ACQUIROR. Acquiror hereby covenants 
and agrees that, prior to the Effective Time, unless otherwise expressly
contemplated by this Agreement or consented to in writing by the Company and the
Shareholders, Acquiror will:

                  (a) use all reasonable efforts to preserve substantially
         intact its business organization;

                  (b) maintain and keep its properties and assets in as good
         repair and condition as at present, ordinary wear and tear excepted,
         and maintain supplies and inventories in quantities consistent with its
         customary business practice; and

                  (c) use all reasonable efforts to keep in full force and
         effect insurance and bonds comparable in amount and scope of coverage
         to that currently maintained.

         6.02     NEGATIVE COVENANTS OF ACQUIROR. Except as expressly 
contemplated by this Agreement or otherwise consented to in writing by the
Company and the Shareholders, from the date of this Agreement until the
Effective Time, Acquiror will not do any of the following:

                  (a) amend any of the material terms or provisions of the
         Acquiror Shares;

                  (b ) knowingly take any action that would result in a failure
         to maintain the listing of the Acquiror Shares on the Nasdaq Stock
         Market or any other nationally recognized stock market;

                  (c) propose to adopt any amendments to the Acquiror
         Organizational Documents that would have an adverse effect on the
         consummation of the transactions contemplated by this Agreement; or

                  (d) agree in writing or otherwise to do any of the foregoing.

         6.03     PAYMENT TO LENDER OF THE COMPANY. All indebtedness of the 
Company and its subsidiaries to the Company's lender in the amounts set forth on
Schedule 6.03 shall have been paid in full by Acquiror within ten (10) days of
Closing, and Acquiror shall undertake to have all liens released and discharged
and provide evidence of same to the Shareholders' Representative.




                                      -27-

<PAGE>   33


                                   ARTICLE VII

                              ADDITIONAL AGREEMENTS

         7.01     NOTIFICATION OF CERTAIN MATTERS. The Company and each of the
Shareholders shall give prompt notice to Acquiror, and Acquiror shall give
prompt notice to the Company, orally and in writing, of (i) the occurrence, or
failure to occur, of any event which occurrence or failure would be likely to
cause any representation or warranty of the party giving such notice contained
in this Agreement to be untrue or inaccurate at any time from the date hereof to
the Effective Time, (ii) any material failure of the party giving such notice to
comply with or satisfy any covenant, condition or agreement to be complied with
or satisfied by such person hereunder within the time specified therefor and
(iii) any change or event having, or which, insofar as can be reasonably
foreseen, could have, a material adverse effect on the financial condition,
results of operations, business or prospects of Acquiror or the Company.

         7.02     ACCESS AND INFORMATION.  Between the date hereof and the 
Closing Date:

                  (a) The Company shall, and shall cause its subsidiaries to,
         (i) afford to Acquiror and its officers, directors, employees,
         accountants, consultants, legal counsel, agents and other
         representatives (collectively, the "Acquiror Representatives") access
         during ordinary business hours and at other reasonable times, upon
         reasonable prior notice, to the officers, employees, accountants,
         agents, properties, offices and other facilities of the Company and its
         subsidiaries and to the books and records thereof and (ii) furnish
         promptly to Acquiror and the Acquiror Representatives such information
         concerning the business, properties, contracts, records and personnel
         of the Company and its subsidiaries (including, without limitation,
         financial, operating and other data and information) as may be
         reasonably requested, from time to time, by Acquiror or the Acquiror
         Representatives.

                  (b) Acquiror shall, and shall cause its subsidiaries to, (i)
         afford to the Company and its officers, directors, employees,
         accountants, consultants, legal counsel, agents and other
         representatives (collectively, the "Company Representatives") access
         during ordinary business hours, upon reasonable prior notice, to the
         officers, employees, accountants, agents, properties, offices and other
         facilities of Acquiror and its subsidiaries and to the books and
         records thereof and (ii) furnish promptly to the Company and the
         Company Representatives such information concerning the business,
         properties, contracts, records and personnel of Acquiror and its
         subsidiaries (including, without limitation, financial, operating and
         other data and information) as may be reasonably requested, from time
         to time, by the Company or the Company Representatives.

                  (c) Notwithstanding the foregoing provisions of this Section
         7.02, neither party shall be required to grant access or furnish
         information to the other party to the extent that such access or the
         furnishing of such information is prohibited by Law or contract. No
         investigation by the parties hereto made heretofore or hereafter shall
         affect the representations and warranties of the parties that are
         contained herein and each such representation and warranty shall
         survive such investigation.


                                      -28-
<PAGE>   34

                  (d) Each party to this Agreement shall hold in confidence and
         not disclose, except on a "need to know" basis to its respective
         Acquiror Representatives or Company Representatives, as the case may
         be, all nonpublic information received from the other party to this
         Agreement ("Confidential Information") until such time as such
         Confidential Information is otherwise publicly available and, if this
         Agreement is terminated, each party will deliver to the other party all
         documents, work papers and other materials (including copies) obtained
         by such party or on its behalf from another party as a result of this
         Agreement or in connection herewith, whether so obtained before or
         after the execution hereof. The foregoing obligations of
         confidentiality and nondisclosure shall be effective for a period of
         two (2) years after such termination; provided that such obligations of
         the Acquiror Companies shall terminate at the Closing.

                  (e) In the event that a party, or anyone to whom it supplies
         Confidential Information, receives a request to disclose all or any
         part of the Confidential Information under the terms of a subpoena or
         order issued by a Governmental Entity, the party agrees (i) to notify
         the other party immediately of the existence, terms and circumstances
         surrounding such request, (ii) to consult with the other party on the
         advisability of taking legally available steps to resist or narrow such
         request, and (iii) if disclosure of such Confidential Information is
         required to prevent a party from being held in contempt or subject to
         other penalty, to furnish only such portion of the Confidential
         Information as the disclosing party is legally compelled to disclose
         and to exercise its best efforts to obtain an order or other reliable
         assurance that confidential treatment will be accorded to the disclosed
         Confidential Information.

         7.03     APPROPRIATE ACTION; CONSENTS; FILINGS.

                  (a) The Company and Acquiror shall each use, and shall cause
each of their respective subsidiaries to use, and each of the Shareholders shall
use all reasonable efforts promptly (i) to take, or cause to be taken, all
appropriate action, and do, or cause to be done, all things necessary, proper or
advisable under applicable Law or otherwise to consummate and make effective the
transactions contemplated by this Agreement, (ii) to obtain from any
Governmental Entities any consents, licenses, permits, waivers, approvals,
authorizations or orders required to be obtained by the Company, Acquiror or any
of the Shareholders, respectively, or any of the Company's or Acquiror's
respective subsidiaries, in connection with the authorization, execution,
delivery and performance of this Agreement and the consummation of the
transactions contemplated hereby, (iii) to make all necessary filings, and
thereafter make any other required submissions, with respect to this Agreement
and the Merger required under (A) the Securities Act and the Exchange Act and
the rules and regulations thereunder, and any other applicable federal or state
securities laws, (B) the HSR Act and (C) any other applicable Law; provided that
Acquiror and the Company shall cooperate with each other in connection with the
making of all such filings, including providing copies of all such documents to
the nonfiling party and its advisors prior to filing and, if requested, shall
accept all reasonable additions, deletions or changes suggested in connection
therewith. The Company and Acquiror shall furnish all information required for
any application or other filing to be made pursuant to the rules and regulations
of any applicable Law in connection with the transactions contemplated by this
Agreement.



                                      -29-

<PAGE>   35

                  (b) Acquiror, the Company and each of the Shareholders agree,
and Acquiror and the Company shall cause each of their respective subsidiaries,
to cooperate and to use all reasonable efforts to contest and resist any action,
including legislative, administrative or judicial action, and to have vacated,
lifted, reversed or overturned any decree, judgment, injunction or other order
(whether temporary, preliminary or permanent) (an "Order") that is in effect and
that restricts, prevents or prohibits the consummation of the Merger or any
other transactions contemplated by this Agreement, including, without
limitation, by vigorously pursuing all available avenues of administrative and
judicial appeal and all available legislative action. Acquiror, the Company and
each of the Shareholders also agree to take any and all reasonable actions,
including, without limitation, the disposition of assets or the withdrawal from
doing business in particular jurisdictions, required by regulatory authorities
as a condition to the granting of any approvals required in order to permit the
consummation of the Merger or as may be required to avoid, lift, vacate or
reverse any legislative or judicial action that would otherwise cause any
condition to the Merger not to be satisfied; provided, however, that in no event
shall any party take, or be required to take, any action that could reasonably
be expected to have a Company Material Adverse Effect or an Acquiror Material
Adverse Effect.

                  (c) The Company, Acquiror and each of the Shareholders shall
each promptly give (or shall cause their respective subsidiaries to give) any
notices regarding the Merger, this Agreement or the transactions contemplated
hereby to third parties required by Law or by any contract, license, lease or
other agreement to which such person is a party or by which such person is
bound, and use (and cause its subsidiaries to use) all reasonable efforts to
obtain any third party consents (i) necessary, proper or advisable to consummate
the transactions contemplated by this Agreement, (ii) otherwise required under
any contracts, licenses, leases or other agreements in connection with the
consummation of the transactions contemplated by this Agreement or (iii)
required to prevent a Company Material Adverse Effect or an Acquiror Material
Adverse Effect, respectively, from occurring after the Effective Time.

                  (d) If any party shall fail to obtain any third party consent
described in subsection (c)(i) above, such party shall use all reasonable
efforts, and shall take any such actions reasonably requested by the other
parties, to limit the adverse effect upon the Company and Acquiror, their
respective subsidiaries, and their respective businesses resulting, or which
could reasonably be expected to result after the Effective Time, from the
failure to obtain such consent.

         7.04     AFFILIATES; POOLING. The Company shall use all reasonable 
efforts to obtain and deliver to Acquiror an executed letter agreement,
substantially in the form of Exhibit C hereto (the "Company Affiliates'
Letter"), from (i) each person identified as an affiliate of the Company in
Section 2.13 of the Company Disclosure Schedule within five (5) days after the
execution hereof, (ii) any person who may be deemed to have become an affiliate
of the Company after the date of this Agreement and on or prior to the Effective
Time as soon as practicable after such person attains such status and (iii) any
person whose agreement thereto may be deemed reasonably necessary by Acquiror to
sustain the Merger's status as a "pooling of interest" for financial accounting
purposes (a "Pooling Transaction").



                                      -30-
<PAGE>   36


         7.05     PUBLIC ANNOUNCEMENTS. Acquiror and the Company shall consult 
with each other before issuing any press release or otherwise making any public
statements with respect to this Agreement or the Merger and shall not issue any
such press release or make any such public statement prior to such consultation;
provided, however, that a party may, without consulting with the other party,
issue such a press release or make such a public statement if required by
applicable Law or the rules of the NASD or a national securities exchange if
such party has used commercially reasonable efforts to consult with the other
party but has been unable to do so in a timely manner.

         7.06     EXPENSES. All costs and expenses incurred in connection with 
this Agreement and the transactions contemplated hereby shall be paid by the
Company or Acquiror, as the case may be; provided that any expenses associated
with any fees associated with the HSR filing shall be split between Acquiror and
the Company. The Shareholders shall not charge the Company or any of its
subsidiaries, or cause the Company or any of its subsidiaries to pay or be
liable, for any costs or expenses incurred by any of the Shareholders in
connection with this Agreement or the transactions contemplated hereby. Any such
costs, expenses or fees not paid by the Company prior to the Closing will become
the obligation of the Surviving Corporation upon consummation of the Merger.

         7.07     EMPLOYEES OF COMPANY.

                  (a) As soon as reasonably practicable after the Effective
Time, but in any event not later than January 1, 1999, Acquiror shall provide
employee benefit plans and arrangements to employees of the Company and its
subsidiaries that are similar to the employee benefit plans and arrangements of
Acquiror for similarly situated employees of the Acquiror as in effect
immediately prior to the Effective Time.

                  (b) The employees of Company and its subsidiaries shall be
credited for their actual years of service with the Company for purposes of
eligibility, vesting and benefit accrual under all benefit plans provided by
Acquiror in accordance with this Section 7.07, including, but not limited to,
vacation, severance, retirement and disability plans.

                  (c) Such employee benefits under any medical plan provided by
Acquiror in accordance with this Section 7.07 shall not be subject to any
exclusions for any pre-existing conditions, and credit shall be received for any
deductibles or out-of-pocket amounts previously paid by employees of the Company
and its subsidiaries for the current plan year under the medical plan maintained
by the Company.

                  (d) Nothing in this Agreement is intended to confer upon any
employee of the Company or its subsidiaries retained by Acquiror after Closing
("Retained Employees") any right to continued employment after evaluation by
Acquiror and its affiliates of their employment needs at any time after the
Closing.

                  (e) Notwithstanding any provision in this Agreement to the
contrary, Acquiror expressly reserves the right to amend, modify, or terminate
any Benefit Plan, program or policy established or maintained by Acquiror or any
of its affiliates (including, without limitation, the Company or its
subsidiaries) for the benefit of the Retained Employees.


                                      -31-
<PAGE>   37

         7.08     TAX-FREE REORGANIZATION. Subject to the terms and conditions
hereof, Acquiror and the Company shall each use its best efforts to cause the
Merger to be treated as a reorganization within the meaning of section 368(a) of
the Code. Acquiror shall cause the Company to comply with all applicable
reporting requirements under section 367(a) of the Code and U.S. Treasury
Regulations issued thereunder.

         7.09     INFORMATION FOR TAX RETURNS. From and after the Closing, the
Acquiror Companies shall cooperate with the Shareholders by providing and
granting access to the Shareholders, promptly upon request, to such records,
documents and other information regarding the Company and its subsidiaries as
the Shareholders may reasonably request from time to time, in connection with
the preparation or audit of any Tax Returns of any of the Company, its
subsidiaries or the Shareholders, and for audits, disputes, refund claims, or
litigation or other proceedings relating thereto.

                                  ARTICLE VIII

                                 INDEMNIFICATION

         8.01     IN GENERAL. Subject to the terms and conditions of this 
Article VIII, the Shareholders agree, jointly and severally, to indemnify,
defend and hold harmless Acquiror and its directors, officers, employees,
consultants, affiliates and controlling persons (collectively, and including the
Company and its subsidiaries after the Effective Time, the "Acquiror Indemnified
Parties"), from and against all Claims asserted against, resulting from, imposed
upon or incurred by Acquiror or any other Acquiror Indemnified Party, directly
or indirectly, by reason of, arising out of, or resulting from (a) the
inaccuracy or breach of any representation or warranty of the Company or any of
the Shareholders contained in or made pursuant to this Agreement, (b) the breach
of any covenant or agreement of the Company or any of the Shareholders contained
in or made pursuant to this Agreement or (c) any Release of Hazardous Substances
on any property currently or previously owned, operated, leased, or used by
Company or any of its subsidiaries or any transport, disposal, or arrangement
for transport or disposal of any Hazardous Substances to or at any site located
offsite the property currently owned or leased by the Company. It is agreed
among the parties hereto that the obligations of the Shareholders to the
Acquiror Indemnified Party pursuant to this Section 8.01 be satisfied only
pursuant to the Escrow Agreement and the procedures set forth in Sections 8.04
and 8.05 hereof. As used in this Article VIII, the term "Claim" shall include
(i) all debts, liabilities and obligations, (ii) all losses, damages, costs and
expenses (including, without limitation, interest (including prejudgment
interest in any litigated matter), penalties, court costs and reasonable
attorneys' fees and expenses), and (iii) all demands, claims, actions, costs of
investigation, causes of action, proceedings, arbitrations, judgments,
settlements and assessments, whether or not ultimately determined to be valid.

         8.02     NO EXHAUSTION OF REMEDIES. The Shareholders acknowledge that 
their obligation under Section 8.01 of this Agreement is independent of the
obligations of the Company pursuant to this Agreement, and that the Shareholders
waive any right to require the Acquiror Indemnified Parties to (i) proceed
against the Company; or (ii) pursue any other remedy whatsoever in the power of
the Acquiror Indemnified Parties.

                                      -32-

<PAGE>   38


         8.03     DEFENSE OF THIRD PARTY CLAIMS. The obligation of the 
Shareholders to indemnify the Acquiror Indemnified Parties under this Article
VIII with respect to Claims relating to or arising from third parties (a "Third
Party Claim") shall be subject to the following terms and conditions:

                  (a) Notice and Defense. The Acquiror Indemnified Party will
         give the other party or parties (whether one or more, the "Indemnifying
         Party") prompt written notice (including all documents and other
         nonprivileged information in the Acquiror Indemnified Party's
         possession related thereto) of any such Third Party Claim, and the
         Indemnifying Party may undertake the defense thereof by representatives
         chosen by it upon written notice to the Acquiror Indemnified Party
         provided within 20 days of receiving notice of such Third Party Claim
         (or sooner if the nature of the Third Party Claim so requires). Failure
         of the Acquiror Indemnified Party to give such notice shall not affect
         the Indemnifying Party's duty or obligations under this Article VIII,
         except to the extent the Indemnifying Party is materially prejudiced
         thereby. The Acquiror Indemnified Party shall make available to the
         Indemnifying Party or its representatives all records and other
         materials required by the Indemnifying Party and in the possession or
         under the control of the Acquiror Indemnified Party, for the use of the
         Indemnifying Party and its representatives in defending any such claim,
         and shall in other respects give reasonable cooperation in such
         defense.

                  (b) Failure to Defend. If the Indemnifying Party, within 20
         days after notice of any such Third Party Claim (or sooner if the
         nature of any Third Party Claim so requires), fails to undertake the
         defense of such Third Party Claim actively and in good faith, then the
         Acquiror Indemnified Party shall have the right, but not the
         obligation, to undertake the defense, compromise or settlement of such
         Third Party Claim, or consent to the entry of a judgment with respect
         thereto.

                  (c) Acquiror Indemnified Party's Rights. Anything in this
         Article VIII to the contrary notwithstanding, (i) if there is a
         reasonable probability that the Third Party Claim may adversely affect
         the Acquiror Indemnified Party other than as a result of money damages
         or other money payments in an aggregate amount of less than $100,000,
         the Acquiror Indemnified Party shall have the right to defend,
         compromise or settle such Third Party Claim (provided that the Acquiror
         Indemnified Party shall not settle such Third Party Claim or consent to
         any judgment without first obtaining the consent of the Indemnifying
         Party, which shall not be unreasonably withheld), and (ii) the
         Indemnifying Party shall not without the written consent of the
         Acquiror Indemnified Party, settle or compromise any Third Party Claim
         or consent to the entry of any judgment that does not include as an
         unconditional term thereof the giving by the claimant or the plaintiff
         to the Acquiror Indemnified Party of an unconditional release from all
         liability in respect of such Third Party Claim.

         8.04     PAYMENT; ARBITRATION. Upon the occurrence of a Claim for which
indemnification is believed to be due hereunder which is not a Third Party
Claim, the Indemnified Party shall provide notice of such Claim to the
Indemnifying Party, stating in specific terms the circumstances giving rise to
the Claim, specifying the amount of the Claim and making a request for any
payment then believed due. Any Claim shall be conclusive against the
Indemnifying Party in all respects 30 days 


                                      -33-

<PAGE>   39

after receipt by the Indemnifying Party of such notice, unless within such
period the Indemnifying Party sends the Indemnified Party a notice disputing the
propriety of the Claim. Such notice of dispute shall describe the basis for such
objection and the amount of the Claim as to which the Indemnifying Party does
not believe should be subject to indemnification. Upon receipt of any such
notice of dispute, both the Indemnified Party and the Indemnifying Party shall
use all reasonable efforts to cooperate and arrive at a mutually acceptable
resolution of such dispute within the next 30 days. If a mutually acceptable
resolution cannot be reached between the Indemnified Party and the Indemnifying
Party with such 30-day period, either party may submit the dispute for
resolution by binding arbitration pursuant to the provisions of this Section
8.04. If a party elects to submit such matter to arbitration, such party shall
provide notice to the other party of its election to do so, and the parties
shall attempt to appoint a single arbitrator. If the parties are unable within
10 days after receipt of the notice to agree on a single arbitrator, then each
party shall appoint one arbitrator, and the two arbitrators so appointed shall
name a third arbitrator within a period of 10 days after their nomination. If
the two arbitrators fail to appoint a third arbitrator within such 10-day
period, a third arbitrator shall be appointed pursuant to the then existing
Commercial Arbitration Rules (the "Rules") of the American Arbitration
Association. In all respects, such panel and the arbitration proceeding shall be
governed by the Rules, and the place of arbitration shall be in a city mutually
selected by the Indemnifying Party and the Acquiror Indemnified Party (or, if no
city can be mutually agreed upon within 10 days, then in Houston, Texas). If it
is finally determined that all or a portion of such Claim amount is owed to the
Indemnified Party, then such Claim amount shall be satisfied in accordance with
Section 8.05 of this Agreement and the Acquiror Indemnified Party shall be
entitled to recovery of all expenses, including reasonable attorneys' fees,
incurred in connection with enforcing its rights under this Article VIII.
Judgment upon the award resulting from arbitration may be entered in any court
having jurisdiction for direct enforcement, or any application may be made to a
court for a judicial acceptance of the award and an order of enforcement, as the
case may be.

         8.05     SATISFACTION OF CLAIMS FROM ESCROW SHARES.

                  (a) After the Effective Time, the indemnification obligations
of the Shareholders under Section 8.01 of this Agreement shall be satisfied
solely from payments of the Escrow Shares by delivery to the Acquiror
Indemnified Party entitled to indemnification hereunder.

                  (b) Pursuant to the provisions of the Escrow Agreement, if the
Shareholders are determined to owe a Claim amount pursuant to the procedures set
forth in Section 8.04, then the amount due the Acquiror Indemnified Party
hereunder shall be satisfied by the delivery to the Acquiror Indemnified Party
pursuant to the Escrow Agreement of Escrow Shares equal in value to the amount
of the Claim to be satisfied, and the Claim shall be deemed paid and satisfied
upon receipt by the Acquiror Indemnified Party of certificates representing such
number of Escrow Shares duly endorsed for transfer to the Indemnified Party. The
per share value of the Escrow Shares for purposes of this Article VIII and the
Escrow Agreement with respect to a particular Claim shall be the Market Value
(as defined herein) of the Escrow Shares. The "Market Value" of an Escrow Share
shall be the actual closing trading price at the end of business on June 30,
1998, with appropriate adjustment to take into account any stock split, reverse
stock split, stock dividend, recapitalization or other similar capital
adjustments with respect to the Escrow Shares. The Market Value of the



                                      -34-
<PAGE>   40

Additional Corpus (as such term is defined in the Escrow Agreement) shall be
determined by mutual agreement of the Shareholders' Representative and the
Acquiror. In the event that such parties cannot in good faith agree on the
market value of the Additional Corpus, the matter shall be settled by binding
arbitration in accordance with the procedures set forth in this Article VIII.

                  (c) The Shareholders' Representative shall have the power and
authority to make all decisions with regard to the settlement of Claims brought
pursuant to Section 8.01 of this Agreement from the Escrow Shares. If the
Shareholders' Representative is unable to carry out his duties as Shareholders'
Representative, then the Shareholder who held the next highest number of shares
of Company Stock immediately prior to the Effective Time, shall be designated
and appointed as the Shareholders' Representative, and shall assume all of the
powers and duties of the Shareholders' Representative under the Agreement and
the Escrow Agreement. If any successor Shareholders' Representative becomes
unable to carry out his duties as Shareholders' Representative, his replacement
shall be the Shareholder who held next highest number of shares of Company Stock
immediately prior to the Effective Time.

         8.06     LIABILITY LIMITATIONS; SURVIVAL OF REPRESENTATIONS AND 
WARRANTIES. All representations, warranties, covenants and agreements of the
Company and the Shareholders in this Agreement or made pursuant hereto shall
survive the Closing, and any investigation thereof, until the first to occur of
(i) the issuance of the first audit report following the Closing Date of the
consolidated financial statements of Acquiror which includes the Surviving
Corporation and (ii) the first anniversary of the Closing Date, and the
Shareholders shall have no liability under this Article VIII unless written
notice of a Claim is provided within such period. After the Effective Time, the
Acquiror Indemnified Parties shall not be entitled to indemnification for Claims
from the Escrow Shares except to the extent the aggregate amount for all claims
exceeds $25,000. Once such threshold is satisfied, the Shareholders, subject to
the other limitations in this Article VIII, shall be liable for all Claims of
the Acquiror Indemnified Parties in excess thereof. After the Effective Time,
all claims by the Acquiror Indemnified Parties pursuant to this Agreement shall
be limited to the Escrow Shares.

         8.07     SUBROGATION. Upon payment in full of any Third Party Claim or
other Claim, the Indemnifying Party shall be subrogated to the extent of such
payment to the rights of the Acquiror Indemnified Parties against any person
with respect to the subject matter and to the extent only of the Third Party
Claim or other Claim.

                                   ARTICLE IX

                                   CONDITIONS

         9.01     CONDITIONS PRECEDENT TO OBLIGATIONS OF THE ACQUIROR COMPANIES.
The obligation of the Acquiror Companies to effect the transactions contemplated
hereby on the Closing Date shall be subject to the satisfaction at or prior to
the Closing Date of the following conditions, any or all of which may be waived
by Acquiror, in whole or in part, to the extent permitted by applicable law:



                                      -35-

<PAGE>   41

                  (a) Each of the representations and warranties of the Company
         and each of the Shareholders contained in this Agreement shall be true
         and correct in all material respects (without duplication of any
         materiality exception contained in any individual representation and
         warranty) as of the date of this Agreement and as of the Closing Date
         as though made again as of the Closing Date;

                  (b) The Company and each of the Shareholders shall have
         performed or complied with all agreements and covenants required by
         this Agreement to be performed or complied with by such person on or
         prior to the Closing Date;

                  (c) Acquiror shall have received a certificate of the
         Secretary or Assistant Secretary (or other authorized corporate
         officer) of the Company certifying as true, accurate and complete, as
         of the Closing Date: (i) a copy of the resolutions of the Company's
         Board of Directors authorizing the execution, delivery and performance
         of this Agreement and the other documents contemplated hereby to which
         it is a party and the consummation by the Company of the Merger; (ii) a
         copy of the resolutions of the Company's shareholders authorizing the
         execution, delivery and performance of this Agreement and the other
         documents contemplated hereby to which it is a party and the
         consummation by the Company of the Merger; (iii) a certified copy of
         the Articles of Incorporation of the Company issued by the Secretary of
         State; (iv) a copy of the Bylaws of the Company; and (v) the incumbency
         of the officer or officers authorized to execute on behalf of the
         Company this Agreement and the other documents contemplated thereby to
         which it is a party;

                  (d) Acquiror shall have received a certificate of the
         Secretary or Assistant Secretary (or other authorized corporate
         officer) of each subsidiary of the Company certifying as true, accurate
         and complete, as of the Closing Date: (i) a certified copy of the
         Articles of Incorporation of the subsidiary issued by the Secretary of
         State of the state of such subsidiary's incorporation; and (ii) a copy
         of the Bylaws of such subsidiary;

                  (e) The resignations, effective at the Effective Time, of each
         of directors and officers of the Company shall have been delivered to
         Acquiror;

                  (f) No court or Governmental Entity shall have enacted,
         issued, promulgated, enforced or entered any Law (whether temporary,
         preliminary or permanent) which is in effect and which has the effect
         of making the Merger illegal or otherwise prohibiting consummation of
         the Merger;

                  (g) The applicable waiting period under any applicable
         competition Laws, Regulations or Orders of foreign Governmental
         Entities, as set forth in the Acquiror Disclosure Schedule or the
         Company Disclosure Schedule, shall have expired or been terminated;

                  (h) Acquiror shall have been advised in writing by Arthur
         Andersen LLP as of the Closing Date to the effect that such firm knows
         of no reason why the Merger cannot be treated for financial accounting
         purposes as a Pooling Transaction;



                                      -36-
<PAGE>   42


                  (i) H. Dean Owen, Jr. shall have duly executed and delivered
         to Acquiror an employment agreement substantially in the form of
         Exhibit D hereto, and David S. Wesson shall have executed and delivered
         to Acquiror an amendment to his employment agreement in substantially
         the form of Exhibit D-1 hereto;

                  (j) Acquiror shall have received the Escrow Agreement, duly
         executed and delivered by the Shareholders' Representative and the
         Escrow Agent;

                  (k) The waiting period under the HSR Act applicable to the
         Merger shall have expired or been terminated;

                  (l) Title to the Real Property described in Section 5.01(f) of
         the Company Disclosure Schedule shall have been conveyed to Silver
         Stone Properties, LLC and the promissory note evidencing the
         indebtedness encumbering the Real Property shall be executed by Silver
         Stone Properties, LLC and delivered to the Company;

                  (m) The Shareholders' Representative and each of the
         Shareholders shall have executed and delivered the Appointment; and

                  (n) The Lease shall have been executed and delivered.

         9.02     CONDITIONS PRECEDENT TO OBLIGATIONS OF THE COMPANY. The
obligations of the Company and the Shareholders to effect the transactions
contemplated hereby on the Closing Date shall be subject to the satisfaction at
or prior to the Closing Date of the following conditions, any or all of which
may be waived by the Company and the Shareholders, acting together, in whole or
in part, to the extent permitted by applicable Law:

                  (a) Each of the representations and warranties of Acquiror
         contained in this Agreement shall be true and correct in all material
         respects (without duplication of any materiality exception contained in
         any individual representation and warranty) as of the date of this
         Agreement and as of the Closing Date as though made again as of the
         Closing Date;

                  (b) The Acquiror Companies shall have performed or complied
         with all agreements and covenants required by this Agreement to be
         performed or complied with by each of them on or prior to the Closing
         Date;

                  (c) The Company and the Shareholders shall have received a
         certificate of the Secretary or Assistant Secretary (or other
         authorized corporate officer) of each of the Acquiror Companies
         certifying as true, accurate and complete, as of the Closing Date: (i)
         a copy of the resolutions of the Board of Directors of each of the
         Acquiror Companies authorizing the execution, delivery and performance
         of this Agreement and the other documents contemplated hereby to which
         it is a party and the consummation by the Company of the Merger; (ii) a
         copy of the resolutions of Acquisition Sub's shareholder authorizing
         the execution, delivery and performance of this Agreement and the other
         documents contemplated hereby to which it is a party and the
         consummation by the



                                      -37-

<PAGE>   43

         Company of the Merger; (iii) a certified copy of the Articles of
         Incorporation (or equivalent organizational document) of each of the
         Acquiror Companies issued by The Netherlands and the Secretary of State
         of the State of Texas, as the case may be; (iv) a copy of the Bylaws
         (or equivalent organizational document) of each of the Acquiror
         Companies; and (v) the incumbency of the officer or officers authorized
         to execute on behalf of each of the Acquiror Companies this Agreement
         and the other documents contemplated thereby to which it is a party;

                  (d) The Company shall have been advised in writing by Weaver &
         Tidwell, LLP as of the Closing Date to the effect that such firm knows
         of no reason why the Merger cannot be treated for financial accounting
         purposes as a Pooling Transaction;

                  (e) No court or Governmental Entity shall have enacted,
         issued, promulgated, enforced or entered any Law (whether temporary,
         preliminary or permanent) which is in effect and which has the effect
         of making the Merger illegal or otherwise prohibiting consummation of
         the Merger;

                  (f) The applicable waiting period under any applicable
         competition Laws, Regulations or Orders of foreign Governmental
         Entities, as set forth in Acquiror Disclosure Schedule or the Company
         Disclosure Schedule, shall have expired or been terminated;

                  (g) The waiting period under the HSR Act applicable to the
         Merger shall have expired or been terminated;

                  (h) The Surviving Corporation shall have executed and
         delivered the employment agreement to H. Dean Owen, Jr. and shall have
         executed an amendment to the employment agreement with David S. Wesson;

                  (i) Acquiror shall have duly executed and delivered to the
         Shareholders a Registration Rights Agreement, substantially in the form
         of Exhibit F hereto (the "Registration Rights Agreement"); and

                  (j) Acquiror shall have duly executed and delivered to Silver
         Stone Properties, LLC the Lease.

                                    ARTICLE X

                                  MISCELLANEOUS

         10.01    TERMINATION. This Agreement may be terminated and the
transactions contemplated hereby may be abandoned at any time prior to the
Effective Time:

                  (a) by mutual consent of Acquiror and the Company;



                                      -38-
<PAGE>   44


                  (b) by either Acquiror or the Company if the Effective Time
         has not occurred on or before September 30, 1998;

                  (c) by Acquiror, upon a breach of any covenant or agreement on
         the part of the Company or any of the Shareholders set forth in this
         Agreement, or if any representation or warranty of the Company or any
         of the Shareholders shall have become untrue, in either case such that
         the conditions set forth in Section 9.01(a) or Section 9.01(b) would
         not be satisfied (a "Terminating Company Breach"); provided that, if
         such Terminating Company Breach is curable by the Company or any of the
         Shareholders, as the case may be, through the exercise of reasonable
         efforts and for so long as the Company or such Shareholder or
         Shareholders continue to exercise such reasonable efforts, Acquiror may
         not terminate this Agreement under this Section 10.01(c);

                  (d) by the Company, upon breach of any covenant or agreement
         on the part of Acquiror set forth in this Agreement, or if any
         representation or warranty of Acquiror shall have become untrue, in
         either case such that the conditions set forth in Section 9.02(a) or
         Section 9.02(b) would not be satisfied (a "Terminating Acquiror
         Breach"); provided that, if such Terminating Acquiror Breach is curable
         by Acquiror through the exercise of its reasonable efforts and for so
         long as Acquiror continues to exercise such reasonable efforts, the
         Company may not terminate this Agreement under this Section 10.02(d);
         or

                  (e) by either Acquiror or the Company, if there shall be any
         Order which is final and nonappealable preventing the consummation of
         the Merger, unless the party relying on such Order has not complied
         with its obligations under Section 7.03(b).

         10.02    EFFECT OF TERMINATION. In the event of any termination of this
Agreement pursuant to Section 10.01, the Shareholders, the Company, Acquiror and
Acquisition Sub shall have no obligation or liability to each other except that
(i) the provisions of Sections 7.02(d) and 7.06 shall survive any such
termination, and (ii) nothing herein and no termination pursuant hereto will
relieve any party from liability for any breach of this Agreement.

         10.03    WAIVER AND AMENDMENT. Any provision of this Agreement may be
waived at any time by the party that is entitled to the benefits thereof. This
Agreement may not be amended or supplemented at any time, except by an
instrument in writing signed on behalf of each party hereto. The waiver by any
party hereto of any condition or of a breach of any provision of this Agreement
shall not operate or be construed as a waiver of any other condition or
subsequent breach.

         10.04    ENTIRE AGREEMENT; THIRD PARTY BENEFICIARIES. This Agreement
(including the Schedules and Exhibits hereto) constitutes the entire agreement
and supersedes all other prior agreements and understandings, both oral and
written, among the parties or any of them, with respect to the subject matter
hereof, and neither this nor any document delivered in connection with this
Agreement confers upon any person not a party hereto any rights or remedies
hereunder except as provided in Article VIII hereof.



                                      -39-
<PAGE>   45


         10.05    ASSIGNMENT. This Agreement shall inure to the benefit of and 
will be binding upon the parties hereto and their respective legal
representatives, successors and permitted assigns. This Agreement shall not be
assignable by any party hereto without the consent of the other parties hereto,
except that the parties hereto agree that the rights and obligations of the
Acquiror may be assigned to an affiliate of the Acquiror by written notice to
all other parties hereto.

         10.06    CERTAIN DEFINITIONS.  For the purposes of this Agreement, the
 term:

                  (a) "affiliate" means a person that directly or indirectly,
         through one or more intermediaries, controls, is controlled by, or is
         under common control with, the first mentioned person;

                  (b) "business day" means any day other than a day on which
         banks in the State of Texas are authorized or obligated to be closed;

                  (c) "Closing" shall mean a meeting, which shall be held in
         accordance with Section 1.11 of this Agreement, of persons interested
         in the transactions contemplated by this Agreement at which all
         documents deemed necessary by the parties to this Agreement to evidence
         the fulfillment or waiver of all conditions precedent to the
         consummation of the transactions contemplated by the Agreement are
         executed and delivered;

                  (d) "Closing Date" shall mean the date of the Closing as
         determined pursuant to Section 1.11 of this Agreement.

                  (e) "Competing Transaction" shall mean any proposal or offer
         from any person or entity (other than Acquiror or an affiliate of
         Acquiror) relating to any acquisition or purchase of all or (other than
         in the ordinary course of business) any material portion of the assets
         of, or any possible disposition or issuance of any Common Stock or any
         capital stock or other equity interests in the Company or any of its
         subsidiaries (or any rights or securities exercisable for or
         convertible into Common Stock or any such capital stock or other equity
         interests), or any merger or other business combination with, the
         Company or any of its subsidiaries;

                  (f) "control" (including the terms "controlled," "controlled
         by" and "under common control with") means the possession, directly or
         indirectly or as trustee or executor, of the power to direct or cause
         the direction of the management or policies of a person, whether
         through the ownership of stock or as trustee or executor, by contract
         or credit arrangement or otherwise;

                  (g) "Governmental Entity" means any foreign, federal,
         national, republic, provincial, state, territorial, county, municipal
         or city agency, department, commission, board, office, bureau, court,
         tribunal or any other political entity, aggregation, or subdivision of
         any of the foregoing;


                                      -40-

<PAGE>   46

                  (h) "person" means an individual, corporation, partnership,
         limited liability company, association, trust, unincorporated
         organization, other entity or group (as defined in Section 13(d) of the
         Exchange Act);

                  (i) "subsidiary" or "subsidiaries" of the Company, Acquiror or
         any other person, means any corporation, partnership, joint venture or
         other legal entity of which the Company, Acquiror or any such other
         person, as the case may be (either alone or through or together with
         any other subsidiary), owns, directly or indirectly, 50% or more of the
         stock or other equity interests the holders of which are generally
         entitled to vote for the election of the board of directors or other
         governing body of such corporation or other legal entity;

                  (j) "Tax" or "Taxes" shall mean any and all taxes, charges,
         fees, levies, assessments, duties or other amounts payable to any
         federal, state, local or foreign taxing authority or agency, including,
         without limitation, (i) income, franchise, profits, gross receipts,
         minimum, alternative minimum, estimated, ad valorem, value added,
         sales, use, service, real or personal property, capital stock, license,
         payroll, withholding, disability, employment, social security, workers
         compensation, unemployment compensation, utility, severance, excise,
         stamp, windfall profits, transfer and gains taxes, (ii) customs,
         duties, imposts, charges, levies or other similar assessments of any
         kind, and (iii) interest, penalties and additions to tax imposed with
         respect thereto; and

                  (k) "Trading Day" shall mean each business day on which the
         Nasdaq Stock Market is open for trading.

         10.07    NOTICES. All notices, requests, demands, claims and other
communications that are required to be or may be given under this Agreement
shall be in writing and (i) delivered in person or by courier, (ii) sent by
telecopy or facsimile transmission, or (iii) mailed, certified first class mail,
postage prepaid, return receipt requested, to the parties hereto at the
following addresses:

         If to the Company:              Owen Oil Tools, Inc.
                                         8900 Forum Way
                                         Fort Worth, Texas  76140
                                         Telecopy:  (817) 568-1297
                                         Attention:  H. Dean Owen, Jr.

         with a copy (which shall
          not constitute notice) to:     Michener, Larimore, Swindle, Whitaker,
                                          Flowers, Sawyer, Reynolds & Chalk,
                                          L.L.P.
                                         3500 City Center Tower II
                                         301 Commerce Street
                                         Fort Worth, Texas  76102-4135
                                         Telecopy:  (817) 335-6935
                                         Attention:  Jonathan K. Henderson


                                      -41-
<PAGE>   47


         If to the Shareholders:         Shareholders of Owen Oil Tools, Inc.
                                         c/o H. Dean Owen, Jr.
                                         8900 Forum Way
                                         Fort Worth, Texas  76140
                                         Telecopy:  (817) 568-1297

         with a copy (which shall
           not constitute notice) to:    Michener, Larimore, Swindle, Whitaker,
                                          Flowers, Sawyer, Reynolds & Chalk, 
                                          L.L.P.
                                         3500 City Center Tower II
                                         301 Commerce Street
                                         Fort Worth, Texas  76102-4135
                                         Telecopy:  (817) 335-6935
                                         Attention:  Jonathan K. Henderson

         If to Acquiror:                 Core Laboratories N.V.
                                         Herengracht 424
                                         1017 BZ Amsterdam
                                         The Netherlands
                                         Telecopy:  011-31-20-627-9886
                                         Attention:  Jacobus Schouten

                  and                    Core Laboratories, Inc.
                                         5295 Hollister Road
                                         Houston, Texas  77040
                                         Telecopy:  (713) 744-6225
                                         Attention:  John D. Denson

         with a copy (which shall
           not constitute notice) to:    Vinson & Elkins L.L.P.
                                         2300 First City Tower
                                         1001 Fannin Street
                                         Houston, Texas  77002-6760
                                         Telecopy:  (713) 615-5531
                                         Attention:  T. Mark Kelly

or to such other address as the parties hereto shall have furnished to the other
parties hereto by notice given in accordance with this Section 10.07. Such
notices shall be effective (i) if delivered in person or by courier, upon actual
receipt by the intended recipient, (ii) if sent by telecopy or facsimile
transmission, when the sender receives telecopier confirmation that such notice
was received at the telecopier number of the addressee, or (iii) if mailed, upon
the earlier of five (5) business days after deposit in the mail and the date of
delivery as shown by the return receipt therefor.

                                      -42-

<PAGE>   48

         10.08    GOVERNING LAW. This Agreement shall be governed by and 
construed in accordance with the substantive law of the State of Texas, without
giving effect to the principles of conflicts of law thereof.

         10.09    SEVERABILITY. If any term, provision, covenant or restriction 
of this Agreement is held by a court of competent jurisdiction to be invalid,
void or unenforceable, the remainder of the terms, provision, covenants and
restrictions of this Agreement shall continue in full force and effect and shall
in no way be affected, impaired or invalidated so long as the economic or legal
substance of the transactions contemplated hereby is not affected in any manner
materially adverse to any party. Upon such determination that any term,
provision, covenant or restriction is invalid, void or unenforceable, the
parties hereto shall negotiate in good faith to modify this Agreement so as to
effect the original intent of the parties as closely as possible in an
acceptable manner to the end that the transactions contemplated hereby are
fulfilled to the extent possible.

         10.10    COUNTERPARTS. This Agreement may be executed in two or more
counterparts, each of which shall be an original, but all of which together
shall constitute one and the same agreement.

         10.11    HEADINGS. The Article and Section headings herein are for
convenience only and shall not affect the construction hereof.

         10.12    MANDATORY MEDIATION; BINDING ARBITRATION; VENUE; ATTORNEYS' 
FEES.

                  (a) Except as provided in Article VIII of this Agreement for
disputes relating to indemnification obligations:

                  (i) Before the institution of any litigation between any
         persons relating to this Agreement, including any dispute over the
         application or interpretation of any provision hereof, if negotiations
         and other discussions fail, at the election of any party to this
         Agreement, such dispute shall be first submitted to mediation in
         accordance with the provisions of the Commercial Mediation Rules of the
         American Arbitration Association before resorting to arbitration. The
         parties agree to conduct the mediation in good faith and make
         reasonable efforts to resolve their dispute by mediation. The
         Commercial Mediation Rules of the American Arbitration Association are
         incorporated by reference. The place of the mediation shall be in a
         city mutually selected by the parties (or, if no city can be mutually
         agreed upon within ten (10) days, then in Houston, Texas).

                  (ii) If the dispute is not resolved by the mediation required
         under the preceding subsection, such dispute shall, at the election of
         any party to this Agreement, be subject to binding arbitration in
         accordance with the provisions of the Rules, and judgment on the
         award rendered by the arbitrator may be entered in any court having
         jurisdiction thereof. The arbitration shall be heard before a panel of
         three (3) arbitrators selected in accordance with the procedures
         therefor set forth in Section 8.04 of this Agreement. The parties agree
         to use the Houston, Texas office of the American Arbitration
         Association, and the place of the arbitration shall be in a city
         mutually selected by the parties (or, if no city can be mutually agreed
         upon within ten (10) days, then in Houston, Texas).



                                      -43-
<PAGE>   49


                  (iii) The prevailing party in any mediation, arbitration or
         litigation shall be entitled to recover from the other party reasonable
         attorneys' fees, court costs and the administrative costs, fees and
         expenses of the American Arbitration Association, each as applicable,
         incurred in the same, in addition to any other relief that may be
         awarded.

                  (b) If either party appeals the decision of the arbitrators,
the parties agree that the United States Judicial District including Harris
County, Texas, and the state courts within Harris County, Texas, shall have
exclusive venue and jurisdiction of same.



                                      -44-
<PAGE>   50

         IN WITNESS WHEREOF, the Company and each of the Acquiror Companies have
each caused this Agreement to be executed on its behalf by its officer thereunto
duly authorized, and each of the Shareholders has executed this Agreement, all
as of the date first above written.

                                           CORE LABORATORIES N.V.

                                           BY:  CORE LABORATORIES INTERNATIONAL,
                                                B.V., its Managing Director


                                           By
                                              ---------------------------------
                                              Jacobus Schouten
                                              Managing Director


                                           OWEN ACQUISITION, INC.



                                           By
                                              ---------------------------------
                                              Name:
                                              Title:


                                           OWEN OIL TOOLS, INC.



                                           By
                                              ---------------------------------
                                              Name:
                                              Title:


                                           SHAREHOLDERS' REPRESENTATIVE:



                                           By
                                              ---------------------------------
                                              H. Dean Owen, Jr.




                                      -45-

<PAGE>   51




<TABLE>
<CAPTION>
                                                   NUMBER OF SHARES                             
                                                      OF COMPANY          NON-ACCREDITED    ACCREDITED
                                                      STOCK OWNED            INVESTOR        INVESTOR
                                                   ----------------       --------------  --------------
Shareholders:                                                                 (Please check one box)
       
<S>                                                <C>                          <C>             <C>    
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</TABLE>




                                      -46-




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