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Drilling
Dec 21, 2018

The general name of the whole drilling pipe string and its joint used in drilling construction (excluding casing for hole protection). The drill tool is composed of an active drill pipe, a drill pipe, a core pipe, a bottom hole expander and a bit, and, if necessary, a sedimentation pipe or a drill collar is added to the upper part of the core pipe. The function of drilling tools is mainly to transfer bit pressure and rotary torque to the drill bit during the drilling process, and to convey drilling flushing fluid to the bottom of the hole to collect rock and mineral cores.

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