Bit is the tool of crash rock and rate of drilling is deep related with type of bit.
钻头是直接破碎井底岩石的工具，钻井速度的高低与钻头类型密切相关。
A drilling tool that USES polycrystalline diamond compact (PDC) cutters to shear rock with a continuous scraping motion.
一种钻井工具，利用聚晶金刚石复合片切削齿通过连续的刮擦运动去剪切岩石。
As one functional part of the rig, drilling pump carries the rock debris from the bottom of the well and supplies power to the drilling tool in the well drilling process.
钻井泵是钻机的三大功能部件之一，其在钻井过程中起着携带井底的岩屑和供给井底动力钻具动力的作用。
In rock drilling process with percussion-rotary drill rotating drilling tool bears two toques: dynamic torque which drives drilling tool into rock mass, and resistance torque of rock mass.
前言：在冲击—回转式凿岩机向岩石钻进过程中，旋转中的钻具承受着两种力矩的作用：一是驱动其旋转的动力矩；二是被钻岩石阻止其旋转的阻力矩。
In rock drilling process with percussion-rotary drill rotating drilling tool bears two toques: dynamic torque which drives drilling tool into rock mass, and resistance torque of rock mass.
前言：在冲击—回转式凿岩机向岩石钻进过程中，旋转中的钻具承受着两种力矩的作用：一是驱动其旋转的动力矩；二是被钻岩石阻止其旋转的阻力矩。
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