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 is increasing its Western Australian footprint with the purchase of 20 per cent of Poseidon gas field, and 29 per cent of Goldwyer. Photo: Xinhua

PetroChina links with US firm ConocoPhillips for gas exploration

PetroChina has agreed to invest in two natural gas exploration projects in Western Australia in partnership with the US oil major ConocoPhillips, with the two companies also joining hands to explore for shale rock gas in south-west China.