دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

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: a part of the brake mechanism consisting of a flexible steel band lined with a material that grips a drum when tightened. On a drilling rig, the brake band acts on the flanges of the drawworks drum to control the lowering of the travelling block and its load of drill pipe, casing, or tubing.

n: Bourdon plate whose inner surface is installed with several brake blocks at definite interval.

n: a piece of drilling equipment that joins the hook and travelling block into one unit designed to support the swivel and drill stem during drilling and to raise and lower drilling tools in and out of the hole.

n: The hoisting block and hook are combinated in a entirety. A component part of hoisting system.

n: a device mounted near the drawworks drum to keep the driller from inadvertently raising the travelling block into the crown block. A probe senses when too much line has been pulled onto the drum, indicating that the travel block is about to strike the crown. The probe activates a switch that simultaneously disconnects the drawworks from its power source and engages the drawworks brake.

a device that keeps the traveling block from being raised ito the crown block.

n: a travelling block with the idle wheels distributed on the upper axis and the lower axis,used in early drilling .

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: a wire rope used to support the drilling tools. Also called the rotary line.

n: The wire rope used to support the travelling block, swivel, kelly and drill string.

the wire rope used to position tools on the floor. Also used to describe the wire rope on a cable tool rig.

n: Latches that secure the drill pipe as it is being raised or lowered. The elevators are connected to the travelling block by links or bails.

n: a single length of wire rope attached to the crown block by which the travelling block is suspended when not in use. Also called a hang-off line.