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reversed flush drilling
expl.
反循环冲洗钻进
冲洗液由孔口密封装置压人孔壁与钻具间的环形空隙,经孔底携带岩屑〈粉〉,然后从钻具内孔返回地表的钻进技术
tech.
反循环冲洗钻进
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