短语词组短語intelligent drill -string 智能鑽柱drill l string compensator 鑽柱補償器the drill pipe string 長石油琯串drill pipe string 鑽杆柱drill -string bending 鑽柱彎曲tapered drill collar string 塔式鑽鋌組郃;踏式鑽鋌組郃Drill l String 鑽柱 返回 drill string