China’s CNOOC Limited (NYSE: CEO; SEHK: 883) said its net profit for the six months ended June 30 increased by 11.2% to RMB7 billion (US$850 million) over the same period last year. Its oil and gas revenues rose 13% to RMB16 billion, helped by a 30.5% increase in natural gas production and a 12.7% increase…