Allis-Chalmers Energy Announces Second Quarter 2008 Earnings Release and Conference...

Allis-Chalmers Energy Announces Second Quarter 2008 Earnings Release and Conference Call Schedule

HOUSTON--(Business Wire)--
Allis-Chalmers Energy Inc. (NYSE:ALY) today announced that it will
release its second quarter results before the market opens on Monday,
August 4, 2008. In conjunction with the release, the Company has
scheduled a conference call that will be broadcast live over the
Internet on Monday, August 4, 2008 at 10:00 a.m. Eastern (9:00 a.m.
Central).

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What: Allis-Chalmers Energy Second Quarter 2008 Earnings
Conference Call

When: Monday, August 4, 2008 at 10:00 a.m. Eastern (9:00 a.m.
Central)

How to: Live via Internet - http://www.alchenergy.com - Allis-
Chalmers Energy Second Quarter 2008 Earnings Conference
Call.
Live via phone - By dialing (888) 771-4350 and asking for
the Allis-Chalmers' conference call about 10 minutes
prior to the start time. The confirmation number is
22369529. For international calls - dial (847) 585-4343
and use confirmation number 22369529.

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Participants may pre-register for the call at the following link
and will be issued a new phone number and a PIN number to use when
dialing into the live call which will provide quick access to the
conference by bypassing the operator upon connection.

http://web.meetme.net/r.aspx?p=1&a=70542236952938

A telephonic replay will be available through August 11, 2008 and
may be accessed by calling (888) 843-8996 (international calls (630)
652-3044) and using the passcode 9685506. Also, a webcast archive will
be available at http://www.alchenergy.com shortly after the call is
complete. For more information, please contact Darla Blaha at
Allis-Chalmers Energy Inc. at 713-369-0550 or email
dblaha@alchenergy.com.

Important Information

In connection with the proposed merger, Allis-Chalmers and Bronco
Drilling have filed a preliminary joint proxy statement/prospectus and
both companies have filed and will file other relevant documents
concerning the proposed merger transaction with the SEC. INVESTORS ARE
URGED TO READ THE JOINT PROXY STATEMENT/PROSPECTUS, AND ANY OTHER
RELEVANT DOCUMENTS FILED WITH THE SEC, BECAUSE THEY WILL CONTAIN
IMPORTANT INFORMATION REGARDING THE MERGER. Investors and security
holders may obtain a free copy of the definitive joint proxy
statement/prospectus (when available) 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 Drilling may be
obtained free of charge from Bronco Drilling's website at
www.broncodrill.com or by calling Bronco Drilling's Investor Relations
department at (405) 242-4444. Investors and security holders are urged
to read the joint proxy statement/prospectus, as it may be amended or
supplemented from time to time and the other relevant materials before
making any voting or investment decision with respect to the proposed
merger.

Allis-Chalmers, Bronco Drilling 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 Drilling 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
Drilling and their ownership of Bronco Drilling common stock is set
forth in its amended annual report on Form 10-K/A filed with the SEC
on April 29, 2008, as further amended, 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.

About Allis-Chalmers

Allis-Chalmers Energy Inc. is a Houston-based multi-faceted
oilfield company. We provide services and equipment to oil and natural
gas exploration and production companies, domestically primarily in
Texas, Louisiana, New Mexico, Colorado, Oklahoma, Mississippi,
Wyoming, Arkansas, West Virginia, offshore in the Gulf of Mexico, and
internationally, primarily in Argentina and Mexico. Allis-Chalmers
provides rental services, international drilling, directional
drilling, tubular services, underbalanced drilling, and productions
services. For more information, visit our website at
http://www.alchenergy.com or request future press releases via email
at http://www.b2i.us/irpass.asp?BzID=1233&to=ea&s=0.

Allis-Chalmers Energy, Inc., Houston
Jeffrey Freedman, VP IR, 713-369-0550

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