当岩心筒在井下被卡住时，很容易地从安全接头螺纹处倒开，起出内筒和岩心，只留下外筒进行打捞。
When coring barrel gets stuck downhole, it is very easy to back off safety joint to trip out inner barrel and cores, and only left outer barrel for fishing operation.
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.
针对复杂打捞中偏磨油管打捞时易变形、胀破或撕裂的难题，研制出特殊滑牙块打捞矛，打捞矛由上接头、矛杆、滑牙块、锁块、销钉、外筒等组成。
In complicated fishing operation, the tubing is very likely to deform, burst and tear owing to eccentric wear, thereby a kind of fishing spear with sliding cone blocks is developed.
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