金刚石钻进中经常出现的钻头“打滑”现象,对钻进效率有很大影响。现场解决这一问题的办法较多,如对钻头进行喷砂、酸蚀,在泥浆中混入岩粉,采用异形唇面钻头和冲击器,以及施加强力规程等。这些措施在某种程度上都可以取得较好的效果。但在缺少相应设施的情况下,向孔底投入碎石块,也颇有效。在某金矿的ZK12—11钻孔中,在钻到坚硬的混合花岗岩时,钻进时效下降到0.2～0.3米,后向 Diamond drill often occurs in the drill “slip” phenomenon, the drilling efficiency has a significant impact. There are many ways to solve this problem in the field, such as sand blasting, acid erosion, mixing rock powder in mud, adopting shaped lip face drill and impactor, and applying strong rules. To some extent, these measures can achieve better results. However, in the absence of appropriate facilities, it is also effective to put gravel into the hole bottom. In a gold mine ZK12-11 borehole, drilling hard to the mixed granite, the drilling time down to 0.2 to 0.3 meters, the backward