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合金冲击回转钻进，一般在Ⅴ-Ⅶ级的中硬岩层才能取得较理想效果。当钻进Ⅶ级以上岩层时，合金冲击回转钻进就远不如钢粒回转钻进了。我们在某煤矿区的ZK1004孔（孔深405米上下）、ZK2705孔及某钨矿区的ZK805孔（斜孔）进行了钢粒反循环冲击回
Alloy impact rotary drilling, usually in the Ⅴ-Ⅶ level hard rock in order to achieve more satisfactory results. When drilling above Ⅶ level rock, the alloy impact rotary drilling is far less than steel ball rotary drilling. We have a coal mine ZK1004 hole (hole depth of 405 meters up and down), ZK2705 hole and a tungsten ore ZK805 hole (oblique hole) for the ball reverse cycle impact back