Sources: PetroChina's Former Indonesia Chief Under Investigation

None of the former executives have been reachable or seen in public since the announcements. Top executives at several PetroChina suppliers have also been implicated.

PetroChina's operations span the globe, from oil production facilities and pipelines to refineries and petrochemical projects. Its market capitalisation of about $235 billion makes it one of the world's most valuable oil firms.

Wei, an industry veteran, took over as head of PetroChina's Indonesia operations in 2004, according to PetroChina.

The unit, with nearly 3,500 employees, has increased crude oil output significantly since its incorporation in 2002, when PetroChina bought U.S. oil firm Devon Energy's assets in Southeast Asia's biggest economy.

PetroChina's output in Indonesia was 5.67 million tonnes in 2011, roughly triple its 2002 level, making it the seventh largest producer in the country.

PetroChina attributed the surge in part to expertise from CNPC's oil service units, including CNPC Daqing Drilling Engineering Co, in extracting oil from mature fields, experience accumulated from decades operating ageing fields at home.

Last month, Reuters reported that PetroChina had tightened control over its managers and stepped up safety inspections to ensure the "shock" from the corruption scandal doesn't disrupt its global operations.


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