HONG KONG, June 19 (Reuters) - China's top offshore oil and gas producer, CNOOC Ltd, has hired Goldman Sachs to advise it on a bid for a stake in Africa-focused oil and gas firm Kosmos Energy, a source said on Friday, in a deal that may be worth about $3 billion.
Private equity-backed Kosmos, which has received a total of $800 million in financing from Blackstone and Warburg Pincus, has hired Standard Chartered and Barclays Plc to sell its stakes in the Jubilee oil field offshore Ghana.
Goldman Sachs declined to comment. CNOOC representatives were not immediately available for comment.
(Reporting by Joseph Chaney; Editing by Ken Wills)