Tags Nguyen Xuan Son Former Chairman of the Vietnam Oil and Gas Group arrested Wednesday, Jul 22, 2015 Former Chairman of the Vietnam Oil and Gas Group (Petrovietnam or PVN) Nguyen Xuan Son was arrested on July 21, for alleged violation of state regulations. Son takes over as PetroVietnam chairman Thursday, Jul 10, 2014 The Prime Minister has signed an order appointing Nguyen Xuan Son as the chairman of the PetroVietnam (PVN) board of directors.