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.
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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