Allis-Chalmers Energy Inc. provides services and equipment to oil and natural gas exploration and production companies throughout the Unites States, including Texas, Louisiana, Arkansas, Pennsylvania, Oklahoma, New Mexico, offshore in the Gulf of Mexico, and globally primarily in Argentina, Brazil, Bolivia and Mexico. It has three segments: oilfield services, drilling and completion and rental services. Oilfield services include the oilfield service divisions, namely directional drilling services, casing and tubular services, underbalanced drilling services and production services. Drilling and Completion includes drilling, completion, workover and related services. Rental Services includes the rental of specialized oilfield equipment. In July 2010, the Company acquired American Well Control, Inc.