摘要
针对多金属矿床中的地层存在硬、脆、碎和相间频繁出现的特点,施工中为有效地避免和减少提、下钻变换钻进取心工具所耗费的时间,增加回次进尺长度和钻进取心效能,探讨了同回次孔底可变正反循环钻进取心工具,以实现钻进效率和取心质量同步提高。
In accordance with the characteristics of frequent alternation of hard rocks andbrittle-broken rocks in polymetallic ore deposits, a tentative idea about the coring tool of thechangeable direct-rversed circulation has been put foward in order to decrease the frequency oflifting and runnign for alternating coring tool and increase trip length, and at last,to improve si-multaneously the drilling efficiency and coring quality.
