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: the cutting elements of a bit.

n pi: see captive customers. core cutter head n: the cutting element of the core barrel assembly. In design it corresponds to one of the three main types of bits: drag bits with blades for cutting soft formations;roller bits with rotating cutters for cutting medium-hard formations;and diamond bits for cutting very hard formations.

n: See cutters.

n: cutting elements whose cutting pedion is biconical,set in the bit to drill the hard formation and very hard formation

n: any bit. such as a diamond bit. whose cutting elements do not move on the face. or head. of the bit. Compare rollercone bit.

n: 1. a cylindrical object, rounded, blunt, or chisel-shaped on one end and usually made of tungsten carbide, that is inserted in the cones of a bit, the cutters of a reamer, or the blades of a stabiliser to form the cutting element of the bit or the reamer or the wear surface of the stabiliser. Also called a compact. 2. a removable part molded to be set into the opening of the master bushing so that various sizes of slips may be accommodated. Also called a bowl. 3. a removable, hard-steel, serrated piece that fits into the jaws of the tongs and firmly grips the body of the drill pipe or drill collars while the tongs are making up or breaking out the pipe. Also called die.

n: A section on a log print that gives the scales of the curves displayed and the depth scale. There usually is an insert at the beginning and end of each interval surveyed.

n: a special type of fixed-head bit that has synthetic diamond cutters that do not disintegrate at high temperatures. Compare polycrystalline diamond compact.

n: The polycrystalline diamond bit that using thermally stable diamond cutter as cutting element.