David J. Tonner

Diversified Well Logging, Inc. engages in mud logging and mud logging related services. The firm mud-logging services with operations and group, electronics and a shop, yard as well as logistics group. The firm offers mud logging systems. The company was founded in 1952 and is headquartered in Reserve, LA.

Weatherford International Ltd. provides equipment and services to the oil and natural gas exploration and production industry. The company was founded in 1972 and is headquartered in Geneva, Switzerland.

International Logging, Inc. engages in the development, manufacture, marketing and sale of petroleum and geothermal mud logging systems for the energy sector clients. Its services include drill logic systems, drilling optimization consulting, gas chromatography, early detection of H2S, kick detection, vibration detection, and whole stability. The company was founded in 1990 and is headquartered in Houston, TX.