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喷射式孔底反循环钻进是提高硬、脆、碎岩矿层采取率的有效方法，其原因是冲洗液在孔底岩心钻具内的流动方向与钻进方向相反。正由于这一点，在采用喷反钻进时，可以看到某些回次取出的岩矿心，明显地呈大小不同的顺序排列，小的颗粒在岩心管上部，大的碎块在岩心管下部。有时还会观察到完整钻粒在岩心上部的现象。关于喷射式反循环钻进时岩心的上下颠倒问题，过去曾进行过一些试验研究与分析，为了满足地质要求，提高岩矿心采取率，现结合室内外试验，谈谈
Jet reverse drilling is an effective method to improve the rate of hard, brittle and broken rock formation. The reason is that the flow direction of flushing fluid in the bottom hole core drill is opposite to the drilling direction. It is precisely because of this, in the use of spray reverse drilling, you can see some of the times back out of the rock core, obviously in different order of size, small particles in the core tube, the big pieces in the core tube Lower part. In some cases, the phenomenon of complete billet over the core is observed. On jet reverse circulation drilling core upside down problem, in the past have carried out some experimental research and analysis, in order to meet the geological requirements and improve rock core mining rate, now combined with indoor and outdoor tests, to talk about