e425
Filed by Bronco Drilling Company, Inc.
pursuant to Rule 425 under the Securities Act of 1933
and deemed filed pursuant to Rule 14a-12
of the Securities Exchange Act of 1934
Subject Company: Allis-Chalmers Energy, Inc.
Commission File No.: 001-02199
Bronco Drilling Company, Inc. Announces Monthly Operating Results
OKLAHOMA CITY, June 9, 2008 (BUSINESS WIRE)—Bronco Drilling Company, Inc., (Nasdaq/GM:BRNC), announced today operational results for the month ended and as of May 31, 2008.
Utilization for the Company’s drilling fleet was 85% for the month of May compared to 78% for the previous month and 69% for the first quarter of 2008. The Company had an average of 45 marketed drilling rigs in May compared to 45 in the previous month and 45 for the first quarter of 2008. The average dayrate on operating drilling rigs as of May 31, 2008, was $16,561 compared to $16,563 as of April 30, 2008, and $17,101 for the first quarter of 2008.
Utilization for the Company’s workover fleet was 74% for the month of May compared to 76% for the previous month and 77% for the first quarter of 2008. The Company had an average of 53 marketed workover rigs in May compared to 53 in the previous month and 48 for the first quarter of 2008.
The Company cautions that several factors other than those discussed above may impact the Company’s operating results and that a particular trend regarding the factors above may or may not be indicative of the Company’s current or future financial performance.
About Bronco Drilling
Bronco Drilling Company, Inc. is a publicly held company headquartered in Edmond, Oklahoma, and is a provider of contract land drilling and workover services to oil and natural gas exploration and production companies. Bronco’s common stock is quoted on The NASDAQ Global Market under the symbol “BRNC”. For more information about Bronco Drilling Company, Inc., visit http://www.broncodrill.com.

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Bronco Drilling Company, Inc.
Rig Status Report
as of May 31, 2008
                                                                 
                                                    Est. Duration (2)
    Rig No.   Horsepower   Rig Type   Basin   Status (1)   Contract   Days   Date
1
     2     400 hp     M               I                          
2
     4     950 hp     M     Piceance     O     Term     178       11/25/2008  
3
     5     650 hp     M     Anadarko     O     well to well                
4
     6     650 hp     M     Anadarko     O     Term     271       2/26/2009  
5
     7     650 hp     M     Woodford     O     well to well                
6
     8     1000 hp     E     Williston     O     well to well                
7
     9     650 hp     M     Arkoma     O     Term     215       1/1/2009  
8
     10     1000 hp     E     Anadarko     O     well to well                
9
     11     1000 hp     E     Woodford     O     Term     309       4/5/2009  
10
     12     1500 hp     E     Anadarko     O     well to well                
11
     14     1200 hp     E     Woodford     O     Term     41       7/11/2008  
12
     15     1200 hp     E     Cotton Valley     O     well to well                
13
     16     1400 hp     E     Anadarko     O     well to well                
14
     17     1700 hp     E     Anadarko     O     well to well                
15
     20     1400 hp     E     Anadarko     O     well to well                
16
     21     2000 hp     E     Woodford     O     3 wells                
17
     22     1000 hp     E     Woodford     O     well to well                
18
     23     1000 hp     E     Piceance     O     3 wells                
19
     25     1500 hp     E     Woodford     O     2 wells                
20
     26     1200 hp     E     Anadarko     O     3 wells                
21
     27     1500 hp     E     Piceance     O     Term     353       5/19/2009  
22
     28     1200 hp     E     Anadarko     O     well to well                
23
     29     1500 hp     E     Woodford     O     3 wells                
24
     37     1000 hp     E     Cotton Valley     O     well to well                
25
     41     950 hp     M     Anadarko     O     well to well                
26
     42     650 hp     M     Anadarko     O     well to well                
27
     43     1000 hp     M     Cotton Valley     O     Term     21       6/21/2008  
28
     51     850 hp     M     Anadarko     O     well to well                
29
     52     850 hp     M     Anadarko     O     well to well                
30
     53     850 hp     M               I                          
31
     54     850 hp     M     Woodford     O     Term     354       5/20/2009  
32
     55     1000 hp     M     Anadarko     O     3 wells                
33
     56     1100 hp     M     Anadarko     O     well to well                
34
     57     1100 hp     M     Woodford     O     Term     294       3/21/2009  
35
     58     800 hp     M     Cotton Valley     O     well to well                
36
     59     850 hp     M               I                          
37
     60     850 hp     M     Anadarko     O     well to well                
38
     62     1000 hp     M     Anadarko     O     well to well                
39
     70     450 hp     M     Anadarko     O     well to well                
40
     72     750 hp     M     Barnett     O     6 wells                
41
     75     750 hp     M     Woodford     O     Term     75       8/14/2008  
42
     76     700 hp     M               I                          
43
     77     1200 hp     M     Anadarko     O     3 wells                
44
     78     1200 hp     M     Cotton Valley     O     2 wells                
45
     97     850 hp     M     Anadarko     O     well to well                
 
     
M - Mechanical
  I - Idle
E - Electric
  O - Operating
1   Rigs classified as “operating” are under contract while rigs described as “idle” are not under contract but are being actively marketed and generally ready for service.
 
2   The estimated contract duration is derived from discussions with our customer regarding their current projection of the days remaining to complete the project.
 
    Changes from the prior month are highlighted.

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Important Information
On January 23, 2008, Bronco entered into a merger agreement with Allis-Chalmers Energy Inc. (“Allis-Chalmers”), providing for the acquisition of Bronco by Allis-Chalmers. On June 1, 2008, Bronco and Allis Chalmers entered into an amendment to such merger agreement. In connection with the proposed merger, Allis-Chalmers filed a registration statement on Form S-4 (Registration No. 333-149326) with the Securities and Exchange Commission (the “SEC”) on February 20, 2008, a first amendment to such registration statement on Form S-4 with the SEC on March 27, 2008, and a second amendment to such registration statement on Form S-4 with the SEC on June 9, 2008, which registration statement contains a joint proxy statement/prospectus of both companies. Allis-Chalmers and Bronco may file other relevant documents concerning the proposed merger, including any amendments to such registration statement. INVESTORS ARE URGED TO READ THE JOINT PROXY STATEMENT/PROSPECTUS AND ANY OTHER RELEVANT DOCUMENTS FILED WITH THE SEC, BECAUSE THEY CONTAIN IMPORTANT INFORMATION REGARDING THE MERGER. Investors and security holders may obtain a free copy of the joint proxy statement/prospectus and the other documents free of charge at the website maintained by the SEC at www.sec.gov.
The documents filed with the SEC by Allis-Chalmers may be obtained free of charge from Allis-Chalmers’ website at www.alchenergy.com or by calling Allis-Chalmers’ Investor Relations department at (713) 369-0550.
The documents filed with the SEC by Bronco may be obtained free of charge from Bronco’s website at www.broncodrill.com or by calling Bronco’s Investor Relations department at (405) 242-4444.
Investors and security holders are urged to read the joint proxy statement/prospectus and the other relevant materials before making any voting or investment decision with respect to the proposed merger.
Allis-Chalmers, Bronco and their respective directors and executive officers may be deemed to be participants in the solicitation of proxies from the respective stockholders of Allis-Chalmers and Bronco in connection with the merger. Information regarding such persons and a description of their interests in the merger are contained in the joint proxy statement/prospectus filed with the SEC, as it may be amended or supplemented from time to time. Information about the directors and executive officers of Allis-Chalmers and their ownership of Allis-Chalmers’ common stock is set forth in its amended annual report on Form 10-K/A filed with the SEC on April 29, 2008 and in subsequent statements of changes in beneficial ownership on file with the SEC. Information about the directors and executive officers of Bronco and their ownership of Bronco’s common stock is set forth in its amended annual report on Form 10-K/A filed with the SEC on April 29, 2008 and in subsequent statements of changes in beneficial ownership on file with the SEC. Investors may obtain additional information regarding the interests of such participants by reading the joint proxy statement/prospectus for the merger, as it may be amended or supplemented from time to time.
THIS PRESS RELEASE IS NOT AN OFFER TO SELL THE SECURITIES OF ALLIS-CHALMERS AND IT IS NOT SOLICITING AN OFFER TO BUY THESE SECURITIES.
Cautionary Note Regarding Forward-Looking Statements
The information in this report contains forward-looking statements within the meaning of Section 27A of the Securities Act of 1933, as amended, and Section 21E of the Securities Exchange Act of 1934, as amended. These forward-looking statements include, but are not limited to, comments pertaining to estimated contract duration. Such statements are subject to risks, uncertainties and assumptions, including, but not limited to, early termination by the customer pursuant to the contract or otherwise, cancellation or completion of certain contracts or projects earlier than expected, operating hazards and other factors described in Bronco Drilling Company, Inc’s. Annual Report on Form 10-K filed with the SEC on March 17, 2008, as amended on April 29, 2008, and other filings with the SEC, which are available free of charge on the SEC’s website at www.sec.gov. Bronco cautions you that forward-looking statements are not guarantees of future performance and that actual results or developments may differ materially from those projected or implied in these statements.
     
Contact:
  Bob Jarvis
 
  Investor Relations
 
  Bronco Drilling Company
 
  (405) 242-4444 EXT: 102
 
  bjarvis@broncodrill.com

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