Adaptability selection of Diamond-impregnated drill in drilling construction
Diamond-impregnated drill bit is one of the essential tools for geological core drilling.This paper summarizes the characteristics of diamond drill bits from three well-known companies in the world and their corresponding selection relationship with different strata.It is considered that they have certain advantages in the adaptability of drill bits to strata and the classification of drill bits compared with China.On this basis,in view of the problems of complicated classification,difficult selection and poor adaptability to strata of drill bit matrix in China,this study puts forward practical and effective corresponding selection schemes of drill bit and strata in drilling construction from three aspects:drill bit matrix type,formation lithology and con-struction cases,and develops four kinds of matrix formulas to meet the drilling needs of soft rock strata,me-dium hard rock strata-hard rock strata and extremely hard rock strata.The derived K series and S series drill bit matrix are marked by'letter+number',and have achieved good application results in engineering practice.