دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: a special housing for the positive-displacement downhole mud motor, which is manufactured with a bend of 10 to 30 to facilitate directional drilling.

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 spin table is controlled to be convenient for removing drill bit and holding reactive torque when using mud motor.

n: Used when sealing. Installed in the bit or mud motor.

n: a drilling tool made up in the drill string directly above the bit. It causes the bit to turn while the drill string remains fixed. It is used most often as a deflection tool in directional drilling, where it is made up between the bit and a bent sub (or, sometimes, the housing of the motor itself is bent). Two principal types of down-hole motor are the positive-displacement motor and the downhole turbine motor. Also called mud motor.

n: A special tool mounted in the BHA (q.v.) to drive the bit without rotating the drill string from surface (see positive displacement motor).

n: (1):drilling cant be proceeded because the mud motor cant propel the bit.(2): a kind of symbol to indicate the error

n: the turbodrill or the dynadrill

n: a kind of rotational rig whose uninodal pipe is diaplaced by continuous hose and whose bit is propelled by mud motor

n: see downhole motor.

n: a downhole component of drill string that rotates the bit without having to turn the rotary table. The term is sometimes applied to both positive displacement motors and turbodrills (q.v.).

a hydraulic powered motor used on the drilling sting or coiled tubing to provide rotation.

n: when starting the mud motor pulles up the drilling bit and rotaries , then laies down to the bottom and adds the pressure. The above drilling method is called off bottom rotation.