دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: 1. a derrick or crane shaped like the letter A and used to handle heavy loads. 2. an A-shaped openwork structure that is the stationary and supporting component of the mast of a jackknife rig and to which the mast is anchored when it is in an upright or drilling position. 3. the uppermost section of a standard derrick, shaped like the letter A and used as a support in lifting objects such as the crown block to the water table.

n: A kind of "A" frame gin pole, used to elevate heavy object.

n: the cable attached to a bailer, passed over a sheave at the top of the derrick, and spooled on a reel.

n: The wire rope connected with bailer, winded to the drum through the pulley on the top of crown block.

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: Refers to the situation that the block strikes crown pulley when crown block saver is out of order and the clutch is not reliefed timely.

n: I. the crown block or top of a derrick or mast. 2. the top of a piston. 3. a high spot formed on a tool joint shoulder as the result of wobble.

n: The top of the derrick containing the blockline sheaves.

high point.

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: See crown-block protector.

n pi: projections on the frame to which the crown block is attached.

n: The bulge used to anchor the base of crown block.