دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: see breakout cathead, cathead. makeup cathead.

n: The general form of address of mechanized cathead. Used for winding wire line automatically and draw the tongs to make up and breakout.

n: a transformer with only one winding, part of which is used for either the primary or secondary conductor, and part of which is used as both primary and secondary conductors.

n: a trade name for a special form of sucker rod. Corod, or continuous rod, normally has no joints between the downhole pump and the surface. It is installed into the well by unwinding it from a reel. See sucker rod.

n: an underwater pipe-joining technique in which the pipe is pulled to a target area in line with the platform but to one side of it. The connection is made by winding or otherwise deflecting the pipe laterally until it mates with the riser connection. Compare direct pull-in connection.

n: All diagonal or erect second structural part. Used to prevent the leg of derrick mask shaking and winding under force.

n: the hoisting mechanism on a drilling rig. It is essentially a large winch that spools off or takes in the drilling line and thus raises or lowers the drill stem and bit.

n: The hoist used to control movement of the travelling block by winding in or out the blockline on a drum. Releasing movement usually controlled by a band or disk brake, sometimes assisted by a movement brake (eddy current or hydromatic).

n: The act of unwinding a cable from a drum. Also a device on a drilling rig that keeps the weigh on the bit constant and lowers the drilling line automatically. See also Automatic driller.

n: (IWRC) a core for wire rope consisting of a strand of steel wires with a spiral winding that is opposite that of the outer strands of the rope. Also called independent wire rope centre.

n: an alternating-current motor in which the primary winding on a part (usually the stator) is connected to a source of power, and the secondary winding (usually on the rotor) carries current induced by the magnetic field of the primary winding.