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在冲击回转挤压成孔的钻进中通常采用圆锥型的挤压钻头，这种钻头在松软地层中的钻进效率很高，但在高围压下的中、硬塑性地层中的钻进效率明显降低。针对这一问题，分析了地层因素对钻进效率的影响及其原因，针对圆锥型挤压钻头存在的问题，设计了凸轮型挤压钻头。并指出了冲击回转挤压成孔钻进方法的适用范围。
Conical extrusion drills are commonly used in impact rotary extrusion bores, which are highly efficient drilling in soft formations but are drilled in medium and hard plastic formations at high confining pressures Efficiency is significantly reduced. In response to this problem, the influence of formation factors on the drilling efficiency and the reasons are analyzed. Aiming at the problems existing in the conical extrusion bit, a cam-type extrusion bit is designed. And pointed out the impact rotary extrusion squeeze hole drilling method of application.