Allis-Chalmers Energy to Participate at the RBC Capital Markets Energy Conference

Business Wire, May 29, 2008

HOUSTON -- Allis-Chalmers Energy Inc. (NYSE:ALY) today announced that it will be participating at the RBC Capital Markets Energy Conference being held June 2-3, 2008, in New York.

Micki Hidayatallah, Allis-Chalmers' Chief Executive Officer, is scheduled to participate in a panel discussion on Monday, June 2, 2008, at approximately 2:10 pm Eastern time.

A live audio webcast will be available through the link below and archived for 30 days after the conference. The slides for the presentation will be available on Allis-Chalmers' website at www.alchenergy.com.

http://www.wsw.com/webcast/rbc90/panel5

About Allis-Chalmers

Allis-Chalmers Energy Inc. is a Houston-based multi-faceted oilfield services 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 directional drilling services, casing and tubing services, underbalanced drilling, production and workover services with coiled tubing units, rental of drill pipe and blow-out prevention equipment, and international drilling and workover 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.