Allis-Chalmers Energy, Inc. provided equipment to the oil and natural gas exploration companies. It operated through two segments: Drilling Services and Well Services. The Drilling Services segment provided international and domestic drilling, directional drilling, underbalanced drilling, tubular services, and rental services operations. The Well Services segment provided production services and valve manufacturing operations. The company was founded by Munawar H. Hidayatallah in 1913 and was headquartered in Houston, TX.