PetroChina Dagang Oilfield Company, Tianjin 300280, China;
PetroChina Dagang Oilfield Company, Tianjin 300280, China;
PetroChina Dagang Oilfield Company, Tianjin 300280, China;
PetroChina Dagang Oilfield Company, Tianjin 300280, China;
PetroChina Dagang Oilfield Company, Tianjin 300280, China;
PetroChina Dagang Oilfield Company, Tianjin 300280, China;
PetroChina Dagang Oilfield Company, Tianjin 300280, China;
PetroChina Dagang Oilfield Company, Tianjin 300280, China;