The strength of bumping force of a surface bumper jar in the course of releasing stuck tool hinges on various factors.
地面下击器解卡时产生震击力的大小与多种因素有关。
If you are stuck for words, this is a great tool.
如果你陷入单词困境，这是一个很好的工具。
A downhole tool used to cut tubing or similar tubulars that have become stuck in the wellbore.
割断已卡在井筒的油管或类似管子所用的井下工具。
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