Allis-Chalmers Energy Announces First Quarter 2010 Earnings Release and Conference Call Schedule

Allis-Chalmers Energy Inc. (NYSE:ALY) today announced that it will release its first quarter results before the market opens on Wednesday, May 5, 2010. In conjunction with the release, the Company has scheduled a conference call that will be broadcast live over the Internet on Wednesday, May 5, 2010 at 11:00 a.m. Eastern (10:00 a.m. Central).

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.

https://www.conferenceplus.com/confcenter/PinCode/Pin_Code.aspx?100185&o=ULQRfKMjFRgMwP

A telephonic replay will be available through May 12, 2010 and may be accessed by calling (888) 843-8996 (international calls (630) 652-3044) and using the passcode 9337054#. 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.

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, Oklahoma, Louisiana, Arkansas, Pennsylvania, New Mexico, Colorado, offshore in the Gulf of Mexico, and internationally, primarily in Argentina, Mexico and Brazil. 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.