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.

buoyancy device on a Spar.

n: The gas-holder tank connected with discharge line of reciprocal pump. It is a air cushion aerated by compressive air, used to absorb or decrease fluctuation of pressure and delivery capacity disproportion when reciprocal pump works.

n: Used compressive air which replaces flushing fluid as circulation media to cool the bit and carry over cuttings.

n: see air cleaner filter element.

n: A rig whose every clutch and drawworks brakestaff are controled by compressive air. Usually assisted with hydraulic brake and dynamic brake.

n: The inadvertent mechanical incorporation and dispersion of air into a drilling fluid system. See also Aeration.

0.763 lb/ft3 at standard temperature and pressure.