针对山前构造的地层岩性特征，从复合片、刀翼形状、齿型、切削齿力平衡等方面设计和改进了PD C钻头。

Based on the formation lithology characteristics, the PDC bit was optimized from such aspects as the composite block, blade geometry, cutter model, and cutter mechanics balance, etc.

youdao

在前人的研究基础上，化简、推导出了各向异性钻头条件下的横观各向同性地层造斜力和方位力公式。

Basing on former researcher findings, simplified and deduced the formulas of formation deflecting force and azimuth force of transverse isotropy formation under the condition of the anisotropy bit.

youdao

由于钻头转角对地层力的影响很小，计算地层力时可以忽略。

Since the bit tilt Angle has little effect on the formation force, it can be neglected when the formation force is calculated.

youdao