[citation needed] From August 2000 to March 2001, Su acted as Deputy General Manager of China National Petroleum Corporation, Vice President of PetroChina Company Limited, Chairman, General Manager and Secretary to the Party Committee of Daqing Oilfield Company Limited as well as Vice Secretary to the Party Committee of CNPC Daqing Petroleum Administration Bureau.
[citation needed] From December 2003 to September 2006, Su acted as Deputy General Manager and member of the Party Committee of China National Petroleum Corporation, Director and Senior Vice President of PetroChina Company Limited.
[2] At the time of his appointment, he was one of only a handful of provincial leaders in China born after 1960, and therefore was initially considered a promising candidate to enter the top ranks of the national leadership.
Su's former associate, Liao Yongyuan, chief executive of China National Petroleum Corporation, was rounded up for investigation in March 2015.
This provided for an ironic twist years later when both of them fell under the anti-corruption dragnet (Xi Jinping had referred to high-ranking corrupt officials as "tigers").
In the late evening on 7 October 2015, the Central Commission for Discipline Inspection made an abrupt announcement that Su was under investigation for "serious violations of regulations."
Su was the first sitting governor to be investigated by the CCDI since the 18th Party Congress, and the seventh full member of the 18th Central Committee to fall from grace.