دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n pl: the tongs latched on the drill pipe joint hanging in the totary by the slips, used to keep the pipe from turning as the makeup or breakout tongs (the lead tongs) apply torque to make up or break out the tightened tool joint connection. Compare lead tongs.

n: A tong suspended in the derrick, normally on the drillers right, used to hold box end of the tool joint while the pin end is loosened and unscrewed. Also called a make-up tong, as it is moved to pin end to tighten the joint to the recommended torque after

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: elevators that have the handles and latch arranged so that when a crew member opens the latch, they part in the middle. Compare side-door elevators. See elevators.

n: a long steel pole with a hook on one end that allows one of the rotary helpers to release the safety latch on the drilling hook so that the bail of the swivel can be removed (as when the kelly is set back prior to making a trip). Also called a shepherds stick, or hook.

n: A long steel arm with hook. The borer uses it to crook safety latch to unload swivel bail from hook.

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 pl: on conventional rotary rigs and top-drive rigs, hinged steel devices with manual operating handles that crew members latch on to a tool joint (or a sub). Since the elevators are directly connected to the traveling block, or to the integrated traveling block in the top drive, when the driller raises or lowers the block or the topdrive unit, the drill pipe is also raised or lowered.

the snap-around latches that couple around tubing below the pipe coupling and enables the traveling block on a rig to gab and lift the tubular string.

n: a safe instrument along which the elevator latcher can downslip onto the ground from the second platform under emergency situation

n: the fisher to fish bailer ,with latch in the middle

packers equipped with drag blocks or springs so rotation of the pipe unlatches the slips and sets the packer.

n: a packer equipped with friction blocks or drag springs and slips and designed so that rotation of the pipe unlatches the slips. The friction springs prevent the slips from turning with the pipe and assist in advancing the slips up a tapered sleeve to engage the wall of the outside pipe as weight is put on die packer. Also called a wall-hook packer. See packer.