دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: a device on the deadline tiedown anchor used to secure the drilling line.

n: any assembly of pulleys on a common framework;in mechanics. one or more pulleys. or sheaves. mounted to rotate on a common axis. The crown block is an assembly of sheaves mounted on beams at the top of the derrick or mast. The drilling line is reeved over the sheaves of the crown block alternately with the sheaves of the travelling block. which is hoisted and lowered in the derrick or mast by the drilling line. When elevators are attached to a hook on a conventional travelling block. and when drill pipe is latched in the elevators. the pipe can be raised or lowered in the derrick or mast. See crown block, travelling block.

n: one of the two large wheels joined by an axle and used to hold the drilling line on a cable-tool rig.

n: See band wheel.

old term for a large, often wooden wheel, in a cable tool rig.

n: the place at each end of the drawworks drum where the drilling line being spooled onto or off of the drum stops moving in one direction and starts moving in the other direction. Also called turn back. crossover joint n: a length of casing with one thread on the field end and a different thread in the coupling, used to make a changeover from one thread to anod1er in a string of casing.

n: A sub that is used to connect drill string components that have different threads or sizes.

n: an assembly of sheaves mounted on beams at the top of the derrick or mast and over which the drilling line is reeved. See block, reeve the line. sheave.

n: An assembly of sheaves or pulleys mounted on beams at the top of the derrick over which the drilling line is reeved.

the set of pulleys or sheaves at the top of the mast on a rig.

n: Refers to the end of the drilling line which is not reeled on the hoisting drum of the rotary rig. This end of the drilling line is usually anchored to the derrick substructure and does not move as the traveling block is hoisted, hence the term dead line.

n: the drilling line from the crown block sheave to the anchor. so called because it does not move. Comparefastline.

n: See deep drilling liner, deep production liner.

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 spool-shaped cylinder in the drawworks around which drilling line is wound, or spooled.

n: refer to drum