دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: a clamp placed very tightly around a drill collar that is suspended in the rotary table by drill collar slips. Should the slips fail. the clamp is too large to go through the opening in the rotary table and therefore prevents the drill collar string from falling into the hole. Also called drill collar clamp.

a clamp for flush joint pipe. Also any clamp for securing pipe above the rotary table, even when the slips are set.

the derating factor applied to a pressure test limit or weight limit to set a maximum operating load condition.

n: a measurement of load safety for wire rope obtained by using the following formula: Factor of safety = B/W where- B = nominal catalog breaking strength of the wire rope, and W = calculated total static load. Also called design factor of wire rope.

n: The ratio of the dead weight to the breaking strength of the wire rope .

BOP.

n: an accessory to a fishing tool, placed above it. If the tool cannot be disengaged from the fish, the safety joint permits easy disengagement of the string of pipe above the safety joint Thus, part of the safety joint and the tool attached to the fish remain in the hole and become part of the fish.

n: a toolthat is often run just above a fishing tool.if the fishing tool has gripped the fish but can not pull it free, the safty jiont will allow the string to disengage by turning it from surface.

a joint above a piece of equipment that is designed to fail and allow recovery of the upper string.

n: a latch provided on a hook to prevent an object suspended from the hook from accidentally slipping or falling out of it.

n: It be used to decrease the breakup be possibly happened .

n: see trip margin.

n pl: (SOLAS) international maritime rules established to set minimum safety standards for ships and mobile offshore drilling units under way or under tow.

n: the monkey-board, or platform on a derrick or mast on which the derrick-hand works while wearing a safety harness (attached to the mast or derrick) to prevent falling.

n: The workplace on the derrick, in which the derrick man work.

n: a device made up in a tubing string above a packer or other downhole tool that allows a crew on the surface to remove the tubing string should the packer or other tool get stuck.

a section in a downhole tool string than can be actuated by ball or pressure to allow recovery of the pipe string if the tool is stuck.