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在七级以上岩石一般都采用钻粒(钢砂或铁砂)钻进。钻粒钻进在我国解放后虽然被广泛的使用,但对其钻进规范的研究工作,还远远落后于生产的发展。尤其是在不同岩层上钻进压力的问题,还未得到适当的解决,但其看法各不相同。在最近使用钢砂钻进的过程中,在不同岩层上的钻进压力问题,提出了新的看法,就是在7～8级岩层上钻进压力要大,而在九级以上的岩层中钻进压力要适当的减小。这种新的看法和旧的看法——硬岩层压力大、软岩层压力小是完全相反的。因此在我们生产大跃进的形势下,改革旧的钻
Rocks above grade 7 are generally drilled (grit or iron). Drilling into the grain after the liberation in our country although widely used, but its drilling into the normative research, is still far behind the development of production. In particular, the problem of drilling pressure on different formations has not yet been properly resolved, but the opinions vary. In the recent use of grit drilling process, the drilling pressure on different strata, put forward a new view is that in the 7 to 8 rock drilled pressure is greater, and in more than nine rock drill The pressure should be appropriately reduced. This new view and the old view - hard rock pressure, soft rock pressure is completely the opposite. Therefore, in the context of the Great Leap Forward in our production, we must reform the old diamond