William Chiles

Cliffs Drilling Co. provides drilling, well engineering, and offshore production services. The company also offers management services. It has offices in Texas, Louisiana, and Venezuela. The company is headquartered in Houston, TX.

Grey Wolf, Inc. provides contract oil and gas land drilling services. The company was founded in 1980 and is headquartered in Houston, TX.

ENSCO International, Inc. engages in the provision of contract drilling and marine transport services. The company was founded in 1987 and is headquartered in Houston, TX.

Basic Energy Services, Inc. engages in the provision of well site services to oil and natural gas drilling and producing companies. It operates its business through the following segments: Completion and Remedial Services, Well Servicing and Water Logistics. The Completion and Remedial Services segment utilizes coiled tubing services, air compressor packages specially configured for underbalanced drilling operations, an array of specialized rental equipment and fishing tools, thru-tubing, and snubbing units. The Well Servicing segment encompasses a full range of services performed with a mobile well servicing rig, including the installation and removal of downhole equipment and elimination of obstructions in the well bore to facilitate the flow of oil and natural gas. The Water Logistics segment focuses on the fleet of trucks and related assets, including specialized tank trucks, storage tanks, water wells, disposal facilities water treatment, and related equipment. The company was founded in 1992 and is headquartered in Fort Worth, TX.

Part of Valaris Ltd., Chiles Offshore, Inc. operates three ultra-premium hackup drilling rigs. The company is based in Houston, TX. The company was founded in 1997 by William E. Chiles, Erland Peter Bassøe, Jonathan B. Fairbanks. Chiles Offshore was acquired by ENSCO International, Inc. on August 07, 2002 for $425.27 million.

Bristow Group, Inc. engages in the provision of industrial aviation solutions. It offers helicopter transportation, search and rescue (SAR) and aircraft support services to government and civil organizations worldwide. It operates through the following regions: Europe Caspian, Africa, Americas, and Asia Pacific. The Europe Caspian region comprises all its operations and affiliates in Europe and Central Asia, including Norway, the United Kingdom and Turkmenistan. The Africa region consists of African continent, as well as Nigeria and Egypt. The Americas region covers North America and South America, inclusive of Brazil, Canada, Guyana, Trinidad, and the United States Gulf of Mexico. The Asia Pacific region encompasses Australia, and Asia. The company was founded in 1969 and is headquartered in Houston, TX.