Cnooc

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Nexen shares soar after CNOOC makes $15.1BN takeover bid

Nexen shares soared more than 50% after Chinese oil giant CNOOC launched a $15.1 billion takeover bid.

Two Chinese paramilitary guards watch as CNOOC's first independent deep-water oil drilling rig leaves the port of Qingdao, in the eastern province of Shandong, on May 21, 2012.

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