average bit footage
钻头平均进尺
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该方法以一个建成的PD C钻头使用资料库为基础，该数据库包括钻头型号、所钻井段地层的平均剪切强度、单位进尺钻井成本等指标。
It is based on a database of past PDC bits. In the databased, it includes bit type, average shear stress of well which bit was used in, cost per unit length.
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