دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: a hoist operated by compressed air;a pneumatic hoist. Air hoists are often mounted on the rig floor and are used to lift joints of pipe and other heavy objects.

n: (1) in designing or ordering hoisting (lifting) equipment, the maximum weight that the equipment will be able to safely lift. (2) on diesel electric rigs, the maximum amount of electric power that the generators will have to produce to adequately power the rig.

n: wire rope used for hoisting that has had its wires distorted into the shape of a birdcage by a sudden release of load.

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: 1. a movable arm of tubular or bar steel used on some types of cranes or derricks to support the hoisting lines that carry the load.2. floating device used to contain oil. 3. a period of high activity in the oil industry.

n: a large, specially designed, self-propelled workover rig that is driven directly to the well site. Power from a carrier rigs hoist engine or engines also propels the rig on the road. While a carrier rig is primarily intended to perform workovers, it can also be used to drill relatively shallow wells. A carrier rig may be a back-in type or a drive-in type. Compare back-in unit, drive-in unit.

n: A kind of portable service machine. The derrick mask, drawworks, motor and other necessary additional service rig.

a self propelled drilling or workover rig.

n: The hoisting block used for casing by cable rig.

a small drum on a winch on which a hoisting cable or rope can be wrapped.