DEVELOPMENT AND TEST OF THE WIRELINE CORE DRILLING BIT IN DRILLING COMPLEX STRATA

To study on the wear mechanism of drilling bits in drilling complex strata of south coalfields,we have developed a kind of wireline core drilling bit adaptable to the complex strata.At the same time,we have taken an efficient test on keeping the inside and outside diameter size of electroplated diamond bits.This kind of drilling bit has obtained evident drilling effect in different types of strata in the complex coalfield.