دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: the cutting or boring element used in drilling oil and gas wells. The bit consists of a cutting element and a circulating element. The cutting element is steel teeth, tungsten carbide buttons, industrial diamonds, or polycrystalline diamonds (PDCs). The circulating element permits the passage of drilling fluid and utilises the hydraulic force of the fluid stream to improve drilling rates. In rotary drilling, several drill collars are joined to the bottom end of the drill pipe column, and the bit is attached to the end of the drill collars.

a drill bit, commonly either a roller cone, button bit, PDC, diamond or drag bit, used with a rotary string or a mud motor to drill through rock.

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: on a diamond bit, the material (usually powdered and fused tungsten carbide) into which the diamonds are set.

n: a milling device attached to the bottom of washpipe that mills or drills debris accumulated around the outside of the pipe being washed over. Usually, a bum shoe has pieces of very hard tungsten carbide embedded in it. Also caned a rotary shoe. See washpipe.

n: a drilling bit with tungsten carbide inserts on the cones that resemble plugs or buttons. See roller cone bit.

nn: The cone bit which is installed with obtuse tungsten carbide insert.

n: A kind of diamond bit. The diamond cutting teeth which are arranged in the pattern and founding tungsten carbide are cemented together.

n: A kind of cogging of sintered tungsten carbide. Installed in the opening of cone. Be suitable for medium-hard formation.

n: The heigh of tungsten carbide insert above cone surface in cone bit.

n: that part of the cone of a Toner cone bit out of which the teeth are milled or into which tungsten carbide inserts are placed and inside of which the bearings are housed.

n: The shell of cone bit.

n: The blade of tungsten carbide whose lip is conical.