دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: a mechanism used to regulate the amount of weight 00 the bit without the presence of personnel. Automatic drillers free the driller from the sometimes tedious task of manipulating the drawworks brake to maintain correct weight on the bit. Also called an automatic drilling control unit.

n: Mechanism to automatically control the weight on the bit.

n: a heavy, thick-walled tube, usually steel, used between the drill pipe and the bit in the drill stem to provide weight to the bit.

n: A heavy, thick-walled steel tuve that provides weight on the bit to improve penetration rates. A number of drill collar may be used between the bit and the drillpipe.

a very heavy wall pipe used to add weight over the bit during drilling.

n: a device that controls the rate of penetration by maintaining a predetermined constant weight on the bit. Also called an automatic driller or automatic drilling control unit.

n: the equipment which controls the drilling speed without the controls of the driller

n: a device that moves with the heave of a floating offshore drilling rig to prevent the bit from being lifted off the bottom of the hole and then dropped back down (i.e., to maintain constant weight on the bit). It is used with devices such as bumper subs. See motion compensator.

n: any device (such as a bumper sub or heave compensator) that serves to maintain constant weight on the bit in spite of vertical motion of a floating offshore drilling rig.

v: to lower a load or ease up on a line. A driller will slack off on the brake to put additional weight on the bit.