摘要
TheDagangDrillingEngineeringCompany(DDEC)wonthebidandsentfourdrillingcrewstocontractJidongoilfield'sdrillingprojectin1989,thus,forthefirsttime,enteringthedomesticdrillingmarket.Then,itsteppedsuccessively,toLiaohe,Changqing,Xinjiang,Henanoilfield,Nort...