دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: on a roller cone bit, a coneshaped steel device from which the manufacturer either mills or forges steel teeth, or into which the manufacturer inserts tungsten carbide buttons. Most roller cone bits have three cones, which roll, or rotate, on bearings as the bit rotates. As the cones roll over the formation, the cutters on the cone scrape or gouge the formation to remove the rock.

n: a conical-shaped metal device into which cutting teeth are formed or mounted on a roller cone bit. See roller cone bit.

n: See bit cone.

n: refer to drilling -type hole opener

n: the distance that the ends of one bit cone extend into the grooves of an adjacent one in a roller cone bit. Also called intermesh.

n: the correspondence and cooperation of the cone bits gear rim and the next cone s groove.

n: a very hard, and relatively small, cylinder made of tungsten carbide bonded with nickel or cobalt. One end of the insert is rounded or tapered;the other end is truncated (cut oft) and inserted into a bit cone. The round or tapered end contacts the formation and drills it. Several inserts make up the cutters on a tungsten carbide insert bit.