China Petro may buy into Reliance refineryNEVIN JOHN / Mumbai March 31, 2006Chinese oil giant China National Petroleum Corporation (CNPC) is believed to have joined the race with US energy majors Chevron and Exxon to pick up a stake in the Rs 27,000-crore Jamnagar refinery project of Reliance Petroleum Ltd (RPL), a subsidiary of Mukesh Ambani-controlled Reliance Industries Ltd.