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Schlumberger Limited ( French: [ʃlum.bɛʁˈʒe, ʃlœ̃-]) is an oilfield services company.   Schlumberger employees represent more than 140 nationalities working in more than 120 countries.  Schlumberger has four principal executive offices located in Paris, Houston, London, and The Hague. 
Kuwait Petroleum Corporation ( Arabic: مؤسسة البترول الكويتية) is Kuwait's national oil company, headquartered in Kuwait City . The activities of Kuwait Petroleum Corporation (KPC) are focused on petroleum exploration, production, petrochemicals, refining, marketing, and transportation. KPC produces about 7% of the world's total crude oil. Contents
The Rumaila oil field is a super-giant oil field located in southern Iraq, approximately 20 mi (32 km) from the Kuwaiti border. Discovered in 1953 by the Basrah Petroleum Company (BPC), an associate company of the Iraq Petroleum Company (IPC), the field is estimated to contain 17 billion barrels, which accounts for 12% of Iraq's oil reserves estimated at 143.1 billion barrels.
Associated Oil Company was an American oil and gas company once headquartered in San Francisco, California  and served much of the Pacific West Coast, including Hawaii, as well as the Orient  and merged with the Tidewater Oil Company in 1938.  Contents 1 History 1.1 Founding and early years 1.2 Subsidiaries
US$ 1.857 billion (2019) Number of employees. ~28,000 (2019) Website. KBR.com. Footnotes / references.  KBR, Inc. (formerly Kellogg Brown & Root) is a U.S. based company operating in fields of science, technology and engineering.  KBR works in various markets including aerospace, defense, industrial and intelligence. 
Cameron International Corporation (formerly Cooper Cameron Corporation (CCC,) Cooper Oil Tool, Cameron Iron Works,) though now operating under Schlumberger, is a global provider of pressure control, production, processing, and flow control systems as well as project management and aftermarket services for the oil and gas and process industries.
More than 40,000 oil fields are scattered around the globe, on land and offshore. The largest are the Ghawar Field in Saudi Arabia and the Burgan Field in Kuwait, with more than 60 billion barrels (9.5×10 9 m 3) estimated in each. Most oil fields are much smaller.