“directional circulation drilling”的概念、定义、翻译、参考文献-科学参考

单词	directional circulation drilling
释义	directional circulation drilling Encyclopedia 理学钻进方法释 directional circulation drilling正循环钻进冲洗介质经钻杆内腔流向孔底，将钻头切削破碎下来的钻渣岩屑，经钻杆与孔壁的环状空间携带至地面的钻探循环方式。
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