دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: a special type of diamond drilling bit that does not use roller cones. Instead, polycrystalline diamond inserts are embedded into a matrix on the bit. PDC bits are often used to drill very hard, abrasive formations, but also find use in drilling medium and soft formations.

n: a type of drag bit that used small disc of man-made diamond as the cutting surface.