As its name suggests, PetroChina Company Ltd is the listed arm of state-owned China National Petroleum Corporation (CNPC). It is China's biggest oil producer, and is listed in Hong Kong, New York, and Shanghai.

PetroChina may block Citic's investment in Bohai Bay oilfield

PetroChina, the nation's largest oil producer, may exercise its right to pre-empt Citic Resources Holdings' planned US$150 million acquisition of the development right in a mainland oil project, according to a source close to PetroChina.

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