Drillable analysis of the rocks should be strengthened and bit type selection should be well done.
加强岩石可钻性分析，做好钻头选型工作。
The bit type selection is very important to increase drilling speed and reduce costs of drilling in the course of drilling.
钻井过程中钻头类型的选择对于提高钻井速度、降低钻井成本非常重要。
The deep formation has a high degree of hardness and abrasivity; the bit type selection is difficult and the ROP is low especially under the high density mud.
深部井段地层的硬度高、研磨性强，钻头选型困难，特别是在高密度条件下机械钻速低。
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