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.
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。
The statistical results show that the average, the range of change, and the changing rate were augmented with ECP, i. e. the phasic characteristics of shear stress were increased.
统计结果表明：体外反搏使剪切应力的平均值、变化范围及变化速度都发生了变化，即增加了血流和剪切应力的脉动性。
Water content wand initial average principal stress pm0 have significant influences on the initial dynamic shear modulus of undisturbed loess under the condition of pre-shearing stresses.
含水率与初始平均主应力对预剪应力作用下原状黄土的初始动剪切模量具有显著的影响；
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