back off sub
... back off shot解卡倒扣用炸药包 back off sub丢手接头 back off tool松开工具 ...
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... release stud 释放螺栓 release sub 丢手接头 release surfactant 解卡表面活性剂 ...
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射孔器自动丢手接头 automatic gun release sub
射孔器水力丢手接头 hydraulic gun release sub
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针对这种情况，研制出KDS— 115型液压丢手工具。 该型工具通过设置上接头与打捞头之间的凸爪凹槽结构，解决了以往丢手工具不能传递扭矩的问题；
Model KDS-115 hydraulic releasing tool is developed, which solves the problem of torque transfer by designing a claw-groove structure between the upper sub and fishing head.
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