| 摘要 |
oil and gas industry, release of pipe string in process of drilling or overhaul of hole. SUBSTANCE: churning mechanism comprises telescopic rod-striker installed in body. Rod-striker transmits torque to body. Threaded fingered bushing is positioned in ring recess. Rod-striker has male multistart thread matching thread of bushing. Fixing member secures operation of tripping unit to uncouple rod-striker from body without disruption of circulation of flushing fluid. With this in mind valve or hollow weight is dropped in advance. EFFECT: enhanced reliability of churning mechanism. 5 dwg |
