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Nexen

Nexen/CNOOC is a Chinese oil and gas company based in Calgary, Alberta. On 25 February 2013, Nexen became a wholly owned subsidiary of Beijing-based CNOOC Limited. It was a Canadian company, but was purchased by CNOOC.

It has three growth strategies: oil sands and shale gas in western Canada as well as conventional exploration and development primarily in the North Sea, offshore in West Africa, and deepwater exploration in the Gulf of Mexico.