In recent years Petrochina suffered the world hard nut to crack in complicated deep well drilling process in Quele and Dina Tarimu, Yumen Kulongshan, the east of Sichuan and Xinjiang Huoerguosi etc.

• 近年来中石油在塔里木却勒和迪那、玉门窟窿山、四川川东、新疆霍尔果斯等复杂深井钻井过程中遭遇了世界性的难题。