Ovintiv Inc. is an American independent petroleum company. The company was formed in 2020 through a restructuring of its Canadian predecessor, Encana. Ovintiv is incorporated in Delaware and headquartered in Denver, Colorado.
Transocean Ltd. is an American company. It is the world's largest offshore drilling contractor based on revenue and is based in Vernier, Switzerland. The company has offices in 20 countries, including Canada, the United States, Norway, United Kingdom, India, Brazil, Singapore, Indonesia, and Malaysia.
Sonat, Inc., headquartered in Birmingham, Alabama, was a large Fortune 500 American energy holding company. The company was founded in 1928 and was listed on the New York Stock Exchange under the ticker symbol "SNT". Sonat was primarily involved in transmission and marketing natural gas and oil and gas exploration and production. The company was also involved in contract offshore drilling until 1995 when the offshore business became Transocean. In 1999 Sonat merged with El Paso Corporation. The company was headquartered in the AmSouth-Sonat Tower in downtown Birmingham.
A drillship is a merchant vessel designed for use in exploratory offshore drilling of new oil and gas wells or for scientific drilling purposes. In recent years the vessels have been used in deepwater and ultra-deepwater applications, equipped with the latest and most advanced dynamic positioning systems.
Tesco Corporation was an oilfield services company that provided top drive rental services on a day-rate basis for land and oil platforms as well as casing running. It was headquartered in Spring Branch, Houston. In December 2017, the company was acquired by Nabors Industries.
Valaris Limited is an offshore drilling contractor headquartered in Houston, Texas, and incorporated in Bermuda. It is the largest offshore drilling and well drilling company in the world, and owns 52 rigs, including 36 offshore jackup rigs, 11 drillships, and 5 semi-submersible platform drilling rigs.
APA Corporation is the holding company for Apache Corporation, an American company engaged in hydrocarbon exploration. It is organized in Delaware and headquartered in Houston. The company is ranked 431st on the Fortune 500.
Diamond Offshore Drilling, Inc. is an offshore drilling contractor. The company is headquartered in Katy, Texas, United States, and has major offices in Australia, Brazil, Mexico, Scotland, Singapore, and Norway.
Axa XL is an American subsidiary of global insurance and reinsurance company Axa. It is headquartered in Stamford, Connecticut, domiciled in Hamilton, Bermuda, and has more than 100 offices on 6 continents.
Seadrill is an offshore drilling contractor providing worldwide offshore drilling services to the oil and gas industry. Its primary business is the ownership and operation of drillships, semi-submersible rigs, and jack-up rigs for operations in shallow to ultra-deep water in both benign and harsh environments. It provides a contract-based service and primarily serves the oil super-majors, integrated oil and gas, state-owned national oil, and independent oil and gas companies.
Weatherford International plc, an American–Irish public limited company, together with its subsidiaries, is a multinational oilfield service company and one of the largest companies in the world in oil services. Weatherford is a company providing equipment and services used in the drilling, evaluation, completion, production, and intervention of oil and natural gas wells. Many of the company's businesses, including those of predecessor companies, have been operating for more than 50 years.
Ocean Rig UDW Inc. was an operator of semi-submersible oil platforms and underwater drillships and was based in Athens. In 2018, the company was acquired by Transocean.
Noble Energy, Inc. was a company engaged in hydrocarbon exploration headquartered in Houston, Texas. In October 2020, the company was acquired by Chevron Corporation.
Nabors Industries Limited is an American global oil and gas drilling contractor that has operated since 1972. Based in Houston, Texas, Nabors owns the largest land drilling fleet in the world with approximately 400 rigs in more than 20 countries. The company consists of the following business segments: U.S. Drilling, Canada Drilling, International Drilling, Drilling Solutions, and Rig Technologies. Nabors is notable for its historic association with the Guggenheim family.
Verso Corporation, now Billerud Americas Corporation, was a North American producer of coated papers including coated groundwood, coated freesheet, and specialty products. The company restructured in 2016 following Chapter 11 bankruptcy. Verso Corporation operated two paper mills in the U.S. In 2021, the company had approximately 1,700 employees.
Maersk Drilling, also known as The Drilling Company of 1972 A/S, was the drilling-rig operator of Maersk. It was based in Lyngby, Denmark. Established in 1972, the company was a Nasdaq Copenhagen–listed company with the ticket name 'DRLCO'.
Atwood Oceanics, Inc. was an offshore drilling contractor headquartered in Houston, Texas. In October 2017, the company was acquired by Ensco plc.
Pride International, Inc. was an offshore oil drilling company headquartered in Houston, Texas. As of February 2011, it operated 26 drilling rigs. In May 2011, it was acquired by Ensco.
SEACOR Holdings, based in Fort Lauderdale, Florida, provides equipment and services to the offshore petroleum industry and the marine transportation industry.
Chord Energy Corporation is a company engaged in hydrocarbon exploration and hydraulic fracturing in the Williston Basin in North Dakota and Montana. It is organized in Delaware and headquartered in Houston, Texas, with an office in Williston, North Dakota. The company was formerly known as Oasis Petroleum.
$0.964 billion (2020)
$4.263 billion (2020)