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五十年代初,我国在制订全国岩心钻探统一生产定额时,曾制订了一个按可钻性划分岩石的十二级分级表,1958年修订过一次,迄今未改.时隔二十多年,钻探技术已向前大大发展,由硬质合金、铁砂和钢粒钻进,发展到金刚石小口径钻进,这个分级表,显然已不适用.不管钻探技术如何发展,按可钻性划分岩石级别的方法是可取的.但只有依据野外实际钻进条件,在岩石中进行实际钻进所得可钻性的结果,确定岩石级别才是比较客观的.因为在实验室中无法造成与岩石自然赋存完全相同的条件,并且在实验室中所模拟的钻进条件也不同于现场.故笔者认为,实
In the early 1950s, when formulating a unified national production quota for core drilling, China formulated a twelve-level grading table for dividing rock by drillability, which was revised in 1958 and has not been changed so far. After more than 20 years, Drilling technology has been greatly advanced, drilling from cemented carbide, iron sand and steel, to the development of small diameter diamond drilling, this hierarchy apparently not applicable.No matter how the development of drilling technology, according to drillability of the rock level However, it is advisable to determine the rock level based on the actual drilled conditions in the field and the drillability of the actual drilling in the rock, since it is not possible in the laboratory to interact with the natural occurrence of the rock Exactly the same conditions, and in the laboratory simulation of the drilling conditions are also different from the scene. Therefore, I believe that the real