دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: a roller cone bit that is specially designed for air or gas drilling. It is very similar to a regular bit, but features screens over the bearings to protect them from clogging with cuttings and thicker hardfacing on the shirttail to protect them from abrasive, high-velocity air or gas drilling fluid.

n: an extremely hard material, usually crushed tungsten carbide, that is applied to the outside surfaces of tool joints, drill collars, stabilisers, and other rotary drilling tools to minimise wear when they are in contact with the wall of the hole.

n: a flat of very hard mterial welded on the pipe bit ,drill collar,stabilizer and the surface of other tools to reduce the abrasion during they rotating in the well