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喷射式孔底反循环钻具是钻进硬、脆、碎岩矿层取芯效果较好的一种钻具.多年来,一些生产单位和科研部门都分别对喷射式孔底反循环钻具的工作原理及喷射器结构进行过大量的研究和试验,并取得了一定成果.许多勘探队还自己设
Jet bottom hole reverse circulation drilling is drilling a hard, brittle, broken rock ore coring a better drilling tool.For many years, some production units and research departments were respectively on the jet bottom hole reverse circulation drilling tools Working principle and structure of the ejector have done a lot of research and test and achieved some results.Many exploration teams also set up their own