دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: The included angle between the table of PDC and the line paralleling bit axis.

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 layer of polycrystalline diamond connected with the top of PDC in polycrystalline diamond compact bit.

n: a kind of bit which mounted with polycratalline diamond compact and rollers,or othercutting components.

n: according to the regulation of IADC, large cutter size refers to less than three every carat of nautral diamond or the tooth height above 15.875mm of polycrystalline diamond compact (PDC).

abbr: polycrystalline diamond compact.

poly crystalline diamond compact drill bit or cutter.

n: a special type of diamond drilling bit that does not use roller cones. Instead, polycrystalline diamond inserts are embedded into a matrix on the bit. PDC bits are often used to drill very hard, abrasive formations, but also find use in drilling medium and soft formations.

n: a type of drag bit that used small disc of man-made diamond as the cutting surface.

n: the coiring bit that the head of bit mounted polycrystalline diamond compact.

abbr: perforating depth control log.

perforating depth control log.

n: (PDC log) a special type of nuclear log that measures the depth of each casing collar. Knowing the depth of the collars makes it easy to determine the exact depth of the formation to be perforated by correlating casing-collar depth with formation depth.