针对倒扣式常规安全接头在井下退开难度较大 ,剪钉式安全接头完井作业易中途断脱的问题 ,研制了一种液压控制型安全接头。这种安全接头主要由液压释放机构、安全锁定机构和安全连接机构组成。它可有效地实现井下管柱的分级解卡 ,具有结构合理、安全可靠、操作方便和调控简单等优点 ,能满足安全要求较高或结构较复杂井的使用要求。在胜利埕岛油田应用了2 2井次 ,效果良好 Aiming at the problem that the back-up conventional safety joint is more difficult to withdraw in the well and the completion of the shearing safety joint is easy to be disconnected in the middle, a hydraulic control type safety joint is developed. This safety connector is mainly composed of hydraulic release mechanism, safety lock mechanism and safety connection mechanism. The utility model can effectively realize the cascade disassembly of the downhole tubular string, has the advantages of reasonable structure, safety and reliability, convenient operation and simple control, and can meet the use requirements of higher safety requirements or complicated structure. In Shengli Chengdao Oilfield, 22 wells were used and the effect was good