دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: a cement wiper plug that precedes cement slurry down the casing. The plug wipes drilling mud off the walls of the casing and prevents it from contaminating the cement. See cementing, wiper plug. bottompull method n: an offshore pipeline construction technique in which the pipe string remains below the surface while it is towed to its final location.

n: See bottom wiper plug.

in cementing, the first plug pumped in cementing with the two plug system. It isolates the mud and cement slurry and allows passage of the cement slurry when the plug “bumps” or reaches the float shoe or float collar. It is hollow with a diaphragm that is

n: a sensing element consisting of a thin, usually circular, plate that is deformed by pressure applied across the plate.

n: part of a diaphragm meter that regulates the length of the diaphragm stroke;used to adjust the volumetric displacement.

n: an electrical device that senses very small bellows or diaphragm movement in a bellows meter. Allows a computer to calculate flow rates directly by producing electrical output

n: a type of friction clutch that has a metal housing lined with an expandable diaphragm and pads of friction material called friction shoes. The pressure of the expanded diaphragm squeezes the friction shoes against a drum attached to the driving shaft. Friction between the shoes and the drum allows the clutch to engage. See clutch. Compare plate clutch.

n: the turning part used to link the drum and drum shaft or take them off

n: in a two-diaphragm. fourchamber diaphragm displacement meter. the link- age that transfers oscillating motion from the flag rods to turn a tangent and crank assembly.

n: the rubber bar with small holes ，installed in the differiential filling tools of the casing