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: The phenomenon that cutting deposits in the annular due to small displacement of pump and bad throughput capacity of drilling fluid.