CEO [CNOOC] CORRESP: October 10, 2013 Mr. Brad Skinner Mr. Ronald
[October 10, 2013 Mr. Brad Skinner Mr. Ronald Winfrey Division of Corporation Finance 100 F Street, NE Mail Stop 7010 U.S.A. Re: CNOOC Limited Form 20-F for Fiscal Year Ended December 31, 2012 Filed April 24, 2013 Comment Letter Dated August 29, 2013 File No. 001-14966 Dear Mr. Skinner and Mr. Winfrey: Form 20-F for fiscal year ended December 31,]