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.
室内模拟试验表明（1）超高压喷嘴安装在钻头刀翼上能辅助PDC切削齿破岩；
Simulation test shows that, (1) fixing ultra-high pressure nozzle on the bit edge is helpful to penetration with PDC cutting teeth;
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