PRO FORMA FINANCIAL INFORMATION The pro forma financial statements are based on the historical financial statements of Enterra, Total Energy Services Company ("TOTAL"), prior to its acquisition by Enterra on August 12, 1994, and Zapata Energy Industries ("Zapata Energy Industries"), giving effect, under the purchase method of accounting, to certain adjustments. The pro forma balance sheet was prepared as if the acquisitions occurred on June 30, 1995. The pro forma statements of operations were prepared as if the acquisitions had occurred as of January 1, 1994 and do not include any incremental revenues or the effect of any modifications in operations that might have occurred had Enterra owned and operated the businesses during the periods except as described below. The pro forma financial statements should be read in conjunction with the notes to the following pro forma financial statements and with the Consolidated Financial Statements of Enterra and TOTAL and the related notes thereto incorporated by reference herein and the Audited and Interim Combined Financial Statements of Zapata Energy Industries and the related notes thereto contained elsewhere in this Current Report on Form 8-K. The pro forma financial information has been prepared based upon assumptions deemed appropriate by management of Enterra. This information is not necessarily indicative of the actual results or financial condition that would have been achieved had the acquisitions occurred at these dates or of future results. Actual results of TOTAL's operations are included with Enterra's results after August 11, 1994 and actual results of Zapata Energy Industries will be included with Enterra's results only from the date on which the acquisition is consummated. UNAUDITED PRO FORMA BALANCE SHEET JUNE 30, 1995 (In thousands) HISTORICAL PRO FORMA --------------------------------- ------------------------------------- ZAPATA ENERGY ENTERRA INDUSTRIES ADJUSTMENTS(a) ADJUSTED --------------- -------------- ----------------- --------------- ASSETS Current assets: Cash and cash equivalents $ 7,305 $ 2,202 $ -- $ 9,507 Accounts receivable 126,699 10,198 -- 136,897 Inventories 101,387 24,173 -- 125,560 Deferred tax and other current assets 23,065 -- -- 23,065 ----------- ----------- ------------ ----------- Total current assets 258,456 36,573 -- 295,029 Property, plant and equipment 543,355 67,307 (7,810) 602,852 Less accumulated depreciation 308,343 7,810 (7,810) 308,343 ----------- ----------- ------------ ----------- Property, plant and equipment, net 235,012 59,497 -- 294,509 Deferred charges and other assets 6,159 1,493 -- 7,652 Goodwill, net 178,265 18,523 18,915 215,703 ----------- ----------- ------------ ----------- $ 677,892 $ 116,086 $ 18,915 $ 812,893 ----------- ----------- ------------ ----------- ----------- ----------- ------------ ----------- LIABILITIES AND STOCKHOLDERS' EQUITY Current liabilities: Current portion of long-term debt $ 1,142 $ 27,228 $ (27,228) $ 1,142 Accounts payable 32,724 3,558 (3,558) 32,724 Other current liabilities 57,502 4,743 (4,743) 57,502 ----------- ----------- ------------ ----------- Total current liabilities 91,368 35,529 (35,529) 91,368 Long-term debt 128,643 763 135,000 263,643 (763) Deferred income taxes 12,198 1,591 (1,591) 12,198 Other liabilities 470 52,902 (52,902) 470 Minority interest 1,756 -- -- 1,756 Stockholders' equity: Common stock 27,775 3 (3) 27,775 Additional paid-in capital 288,946 20,787 (20,787) 288,946 Cumulative translation adjustment (8,529) -- -- (8,529) Retained earnings 135,265 4,510 (4,510) 135,265 ----------- ----------- ------------ ----------- Total stockholders' equity 443,457 25,300 (25,300) 443,457 ----------- ----------- ------------ ----------- $ 677,892 $ 116,085 $ 18,915 $ 812,892 ----------- ----------- ------------ ----------- ----------- ----------- ------------ ----------- 2 ENTERRA CORPORATION UNAUDITED PRO FORMA STATEMENT OF OPERATIONS FOR THE SIX MONTHS ENDED JUNE 30, 1995 (In thousands, except per share data) HISTORICAL PRO FORMA --------------------------------- ------------------------------------- ENERGY ENTERRA INDUSTRIES ADJUSTMENTS ADJUSTED --------------- -------------- ----------------- --------------- REVENUES $ 229,605 $ 34,923 $ -- $ 264,528 COSTS AND EXPENSES Costs of operations 141,474 25,289 (2,374) (c) 164,389 Selling, general and administrative 49,017 3,840 (1,960) (c) 50,897 Depreciation and amortization 24,242 2,916 536 (d) 27,694 Unusual charges 28,281 -- -- 28,821 ---------- ---------- ---------- ---------- 243,014 32,045 (3,798) 271,261 ---------- ---------- ---------- ---------- OPERATING INCOME (LOSS) (13,409) 2,878 3,798 (6,733) Other income (expense) Interest income 390 156 -- 546 Interest and debt expense (4,647) (1,650) (2,974)(e) (9,271) Other 871 474 -- 1,345 ---------- ---------- ----------- ---------- Income (loss) before income taxes and minority interests (16,795) 1,858 824 (14,113) Income tax provision (benefit) (9,396) 820 311(f) (8,265) ---------- ---------- ---------- ---------- Income (loss) before minority interests (7,399) (1,038) 513 (5,848) Minority interests in (income) loss of subsidiaries 311 -- -- 311 ---------- ---------- ---------- ---------- NET INCOME (LOSS) $ (7,088) $ 1,038 $ 513 $ (5,537) ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- Average shares outstanding 27,755 -- -- 27,755 ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- NET INCOME (LOSS) PER SHARE $ (0.26) $ -- $ -- $ (0.20) ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- Adjusted shares outstanding (k) 23,437 23,437 ---------- ---------- ---------- ---------- Adjusted net income (loss) per share (k) $ (0.30) $ (0.24) ---------- ---------- ---------- ---------- 3 ENTERRA CORPORATION UNAUDITED PRO FORMA STATEMENT OF OPERATIONS DECEMBER 31, 1994 (In thousands, except per share data) HISTORICAL PRO FORMA HISTORICAL PRO FORMA ----------------------------------------------- ------------------------------------- ZAPATA ENERGY ENTERRA TOTAL ADJUSTMENTS ADJUSTED INDUSTRIES ADJUSTMENTS ADJUSTED ------------ --------- ----------- -------- ------------- ----------- ----------- January 1 Year Ended to Eleven Months December 31, August 11, Ended 1994 1994 September 30, 1994 ------------ ---------- ----------- --------- ------------- ----------- ----------- REVENUES $ 302,243 $ 146,390 -- $ 448,633 $ 72,522 $ 6,014 (b) $ 527,169 COSTS AND EXPENSES Costs of operations 179,629 100,089 279,718 52,768 5,080 (b) 332,818 (4,748)(c) Selling, general and admin. 69,055 27,763 (1,910)(g) 94,908 6,917 390 (b) 98,295 (3,920)(c) Depreciation and amortization 33,104 7,833 3,114 (h) 44,051 4,867 490 (b) 50,480 1,072 (d) --------- ---------- ------ -------- -------- ------- --------- 281,788 135,685 1,204 418,677 64,552 1,636 481,593 --------- ---------- ------ -------- -------- ------- --------- OPERATING INCOME (LOSS) 20,455 10,705 (1,204) 29,956 7,970 7,650 45,576 Other income (expense) Interest income 1,019 303 -- 1,322 -- -- 1,322 Interest and debt expense (3,066) (2,841) 77 (i) (5,830) (3,124) (4,058)(e) (13,012) Other 246 (517) -- (271) -- 221 (50) --------- ---------- ------ -------- -------- ------- --------- Income before income taxes and minority interests 18,654 7,650 (1,127) 25,177 4,846 3,813 33,836 Income tax provision (benefit) 6,256 2,586 331 (j) 9,173 2,049 1,408 (f) 12,630 --------- ---------- ------ -------- -------- ------- --------- Income before minority interests 12,398 5,064 (1,458) 16,004 2,797 2,405 21,206 Minority interests 119 123 -- 242 -- -- 242 --------- ---------- ------ -------- -------- ------- --------- NET INCOME (LOSS) $ 12,517 $ 5,187 $(1,458) $ 16,246 $ 2,797 $ 2,405 $ 21,448 --------- ---------- ------ -------- -------- ------- --------- Average shares outstanding 20,832 -- 6,904 27,736 -- -- 27,736 --------- ---------- ------ -------- -------- ------- --------- --------- ---------- ------ -------- -------- ------- --------- NET INCOME (LOSS) PER SHARE $ 0.60 $ -- $ -- $ 0.59 $ 0.77 --------- ---------- ------ -------- -------- ------- --------- --------- ---------- ------ -------- -------- ------- --------- Adjusted shares outstanding(k) 17,603 5,834 23,437 23,437 --------- ---------- ------ -------- -------- ------- --------- --------- ---------- ------ -------- -------- ------- --------- Adjusted net income (loss) per share(k) $ 0.71 $ 0.69 $ 0.92 --------- ---------- ------ -------- -------- ------- --------- --------- ---------- ------ -------- -------- ------- --------- 4 (a) Assumes Enterra will purchase the assets only of Zapata Energy Industries in a taxable transaction for cash of $130 million and will incur transaction costs of $5 million. All necessary funds are assumed borrowed pursuant to an increase in Enterra's current revolving line of credit. Due to the recent acquisition of these assets by Zapata Energy Industries' parent and the write-up to fair market value at that time, no further write-up is expected. Consequently, the transaction assumes goodwill will be recorded in the amount of $37,438 ($18,915 more than reflected on Zapata Energy Industries financials) and such will be amortized over 40 years. (b) To reflect the results of operations for Zapata Energy Industries for the month of October 1993, a period prior to its ownership by Zapata. (c) Reflects the elimination of salaries, benefits and related costs as well as other facilities and overhead costs that are expected as a result of the overlapping operations of Zapata Energy Industries and Enterra's compression business. (d) Reflects an increase in depreciation due to an adjustment to conform to the shorter life assigned to rental assets by Enterra's compression business and an increase in goodwill amortization expense due to the increase in goodwill created by the acquisition of Zapata Energy Industries. (e) Reflects increased interest expense caused by the borrowing of $135 million in connection with the acquisition of Zapata Energy Industries. (f) Reflects an adjustment to income tax expense for the incremental pretax income that results from the acquisition of Zapata Energy Industries and the adjustments reflected above. (g) Reflects the elimination of salaries, benefits and related costs incurred during 1994 of the TOTAL corporate staff and other administrative personnel who were not retained by the combined entity as a result of overlapping positions. (h) Reflects increased depreciation expense due to the write-up of fixed assets depreciated over the estimated ten year life and increased amortization related to goodwill amortized over 40 years, related to the TOTAL acquisition. (i) Reflects a net decrease in interest expense that would have resulted from Enterra's more favorable borrowing rates, offset in part by increased borrowings, from the TOTAL acquisition. (j) Reflects an adjustment to tax expense for the above TOTAL adjustments and to reflect Enterra's incremental tax rate. (k) Adjusted shares outstanding and adjusted net income (loss) per share reflect the conversion of Enterra's actual common shares outstanding to the pro forma common shares of Weatherford International Incorporated ("Weatherford") (0.845 shares of Weatherford for each Enterra share after giving effect to a one-for-two reverse stock split to be effected by Weatherford at the effective time of the merger) that will be received by Enterra stockholders assuming the merger of Enterra and Weatherford is approved as proposed in the Joint Proxy Statement/Prospectus of Enterra and Weatherford. This information is provided herein solely for comparative purposes to information provided in the Joint Proxy Statement/Prospectus. 5