Forbes | In A Blood Bath, China's Oil Majors Are Punished, Profits Plunge Forbes This week, Chinese state-owned oil companies, Petro-China, the country's largest oil and gas producer, and China National Offshore Oil Corp. (Cnooc), the country's largest offshore oil and gas exploration and production company, reported earnings for ... Why China's Overseas Oil Adventurer Can't Cut Costs Forever Bleak forecast for Chinese oil giants PetroChina, Cnooc CNOOC posts first half-year loss on Alberta oil sands charge |