Samuel E. Langford

Ovintiv Exploration, Inc. was an oil and gas company, which was engaged in the exploration, development, and production of crude oil, natural gas, and natural gas liquids. The company was founded by Joe B. Foster in 1988 and was headquartered in Austin, 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.

Canvas Energy, Inc. engages in the acquisition, exploitation, exploration and production of onshore oil and natural gas. It focuses on deposits of Stack, Meramec and Osage, Oswego, and Woodford located in Oklahoma and the Texas Panhandle. The company was founded by Mark A. Fischer and Charles A. Fischer in April 1988 and is headquartered in Oklahoma City, OK.

Langford Upstream Advisory LLC engages in the exploration of oil and gas. The private company is based in Mounds, OK.