David Mullen

Shelf Drilling Holdings Ltd. provides shallow water drilling services to the oil and gas industry in Asia, Africa and the Middle East. It engages in drilling and completion of exploratory and developmental offshore oil and natural gas wells. The firm's fleet consists of jack up rigs and swamp barges. The company was founded on November 30, 2012 and is headquartered in Dubai, the United Arab Emirates.

Part of SLB NV, Schlumberger Nigeria Ltd. is a Nigerian company that develops technologies. The company is based in Lagos, Nigeria. The CEO of the company is David J. Mullen.

Shelf Drilling International Holdings Ltd. provides shallow water drilling services to the oil and gas industry. It offers standard jack-up rigs and swamp barges. The company was founded in 2012 and is headquartered in Dubai, United Arab Emirates.

Part of Subsea 7 SA, Subsea7 is a company based in Luxembourg, Luxembourg. Subsea7 is a leader in the delivery of offshore projects and services for the energy industry. The Luxembourger company enables the growth of renewables and emerging energy, creating sustainable value by delivering the offshore energy transition solutions the world needs, for today and tomorrow. Subsea7's local joint ventures and partnerships support sustainable development of the energy industry, creating lasting value for the people they work with and the places they work in. The company was founded in 1993, and John Evans has been the CEO of the company since 2020.

Wellstream Holdings Ltd. designs and manufactures of bespoke flexible pipeline products. The company was founded in 1983 and is headquartered in Altrincham, the United Kingdom.

Ocean Rig ASA owns and operates drilling rigs. It specializes in offshore exploration, development, and production drilling in deepwater. The company has two drilling rigs, Leiv Eiriksson and Eirik Raude. Ocean Rig serves oil companies. The company was founded in 1996 and is headquartered in Stavanger, Norway