发明授权
US4184553A Method for controlling direction of horizontal borehole 失效
水平井眼方向控制方法

Method for controlling direction of horizontal borehole
摘要:
A heavy cylinder having an axial flow passage is pumped down a rotary drill string to a position adjacent a drill bit to cause an in-seam horizontal drill to be guided in a downward direction. The cylinder can be removed with a latchable retrieval tool after the path of the borehole is sufficiently altered.
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