دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: flat-bottomed enlargement of the mouth of a cylindrical bore. v: to enlarge part of a hole by means of a counter- bore.

n: according to IADC regulation of fixed blade bit classification, the drilling bit cut plane that the height of gauge diameter belows the 1/8 cut plane of drilling bit and the height of counterbore below oe equil to 1/4 and above 1/8 the cut plane of dril

n: according to IADC regulation of fixed blade bit classification, the drilling bit cut plane that the height of gauge diameter and the counterbore belows the 1/8 cut plane of drilling bit . The coring bit difference of inner and outside diameter substitud