دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: a large valve, usually installed above the ram preventers, that forms a seal in the annular space between the pipe and the wellbore or, if no pipe is present, in the wellbore itself. Compare ram blowout preventet:

n: See annular blowout preventer.

a device installed above or below the BOP that is capable of sealing around any device, and even on itself if the wellbore is empty.

n: a blowout preventer in which blind rams are the closing elements. See blind ram.

n: the ram preventer in whose each cage there are two gates

n: a blowout preventer that uses pipe rams as the closing elements. See pipe ram.

n: the preventer that fitted with tube ram as the seal part.

n: a blowout preventer that uses rams to seal off pressure on a hole that is with or without pipe. Also called a ram preventer. Compare annular blowout preventer.

n: see ram blowout preventer.

n: a blowout preventer that uses shear rams as closing elements.

n: A type of vertical seismic profile in which the source is a shear-wave source rather than a compressional-wave source. Shear waves travel through the Earth at about half the speed of compressional waves and respond differently to fluid-filled rock, and so

n: there is a single ram preventer in the shell of ram type preventer, which generally used in sealing tha annular between the pipe and casing.

n: the act of ensuring that a pipe ram preventer will not close on a drill pipe tool joint when the drill stem is stationary. A pup joint is made up in the drill string to Iengthen it sufficiently. v: to position the correct number of feet (or metres) or joints of pipe from the packer to the surface tree, or from the rig floor to the blowout preventer stack.

n: a manually operated ram preventer especially adapted for closure around a wireline.