During the first six months of 2006, PetroChina continued to strengthen the comprehensive management of its mature oilfields and took measures to build capacity at both mature and new oilfields. Aiming to ensure a safe and stable supply at core gas pipeli During the first six months of 2006, PetroChina continued to strengthen the comprehensive management of its mature oilfields and took measures to build capacity at both mature and new oilfields. Aiming to ensure a safe and stable supply at core gas pipeli