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: a device, similar to a ball, used to manipulate hydraulically operated down- hole tools. See ball.

a pump-down fluid separation device. May also be used to operate tools downhole by hydraulic forces.

n: force resulting from pressure on water or other hydraulic fluid.

n: a drilling technics that can progress the speed of drilling, which by using muzzles high pressure jet to clear hole bottom, to reduce to cut reaptely fracture and to cut by hydraulic force.