一、问题的提出近几年来，国内在坚硬岩层钻进用钻头的试验研究方面做了不少工作，取得了一定程度的突破。但必须指出，目前在坚硬岩层中金刚石钻进的效果仍不能令人满意，突出地表现为钻速很低，回次长度很短。近二年来国内七个地质队在坚硬打滑岩层中的部分钻进情况见附表。 First, the issue raised In recent years, the hard rock drill bit in the pilot study done a lot of work, and achieved a certain degree of breakthrough. However, it must be pointed out that the effect of diamond drilling in hard rock is still unsatisfactory so far, and the outstanding performance is that the drilling rate is very low and the length of the return run is very short. In the past two years, seven domestic geological teams in hard slippery strata drilling part of the situation see the attached table.