bit breakage
... bit break-in procedure 钻头试钻过程 bit breakage 钻头损坏 bit breaker 钻头装卸器 ...
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靠近井壁区域存在应力集中现象，岩石可钻性变差，这是PDC钻头外侧易损坏的原因。
There is stress concentration near borehole wall, where rocks drillability gets worse. It is explained that the side of PDC bits is easy to be damaged.
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