دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: a short cylindrical device installed in the drill stem between the bottom most drill collar and a downhole motor. Its purpose is to deflect the downhole motor off vertical to drill a directional hole. See drill stem.

a short section of a tool or pipe that is formed at an angle or is modified downhole by a motor to assist in entering deviated wellbores or drilling off the path of the wellbore.

n: Usually refers to turbine motor and positive displacement drill.

n: refer to downhole 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: a kind of machine whose power machine is set in the bottom of the well and dribes the bit directly to break the rock

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

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: the tendency of the drill string to turn in a direction opposite that of the bit, a factor for which a driller must compensate when using a downhole motor.

n: the tendency of the drill string to ture in the opposite direction from that of the bit. This effect must be considered when setting the toolface in directional drilling when using a downhole motor.

n: a directional survey instrument used in combination with a deflected downhole motor. It shows, on a rig floor monitor, the inclination and direction of a downhole sensing unit.

n: It is consists of down hole equipment ,surface equipment and electric cable.

n: a downhole motor that rotates a bit by the action of the drilling mud on turbine blades built into the tool. When a turbodrill is used, rotary motion is imparted only at the bit;therefore, it is unnecessary to rotate the drill stem. Although straight holes can be drilled with the tool, it is used most often in directional drilling.

n: The dynamic drill that driving the turbine turn by drill fluid.