A new view of using value A and B of rock as indications of rock drillability is put forward. The principle as well as methods of measurement for value A and B are researched. It is practicable to make bit formula using value A and B of rocks as guiding facts.
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张绍和.一种新的岩石可钻性分级方法研究[J].钻探工程,1999,(6):32-35.Zhang Shaohe. Researches on a New Classification Method of Rock Drillability[J]. Drilling Engineering, 1999,(6):32-35.