Since a bending force is exerted on the pipe during break out, the tool joint connection must be set in the slips as low as possible.

由于卸扣会使钻具产生弯曲力，因此，钻具接头必须尽可能低些坐在卡瓦上。

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Tests show that AE signals may be detected from background noises in cutting process, a few hundreds millisecond before tool break down abrupt.

试验结果证明，刀具破损前会出现预兆性的AE信号，并可把该信号从背景噪声中检测出来。

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The simple tool used for cutter to break nill and grinding the breaking nill handle in front of the cutter is introduced.

介绍了为保证车刀良好断屑，研磨车刀前面断屑槽的简易工具。

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