دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: (PVT) trade name for a type of pit-level indicator. See pitlevel indicator.

n: an open-ended tube arranged to face the current of a stream of fluid. It is used in measuring the velocity of a flowing medium.

a small tube used for sensing pressures in a flowing stream.

n: a meter that uses a Pitot tube and a manometer or other differential- pressure mechanism to measure flowing fluids. The difference between the pressure on the Pitot tube and the static pressure is the velocity of the flow, which is directly related to the rate of flow.

abbr: packer;used in drilling reports. pi abbr: pipeline;used in drilling reports. plagioclase n: a common rock-forming mineral varying in composition from sodium aluminum silicate (NaAISi30s) to calcium aluminum silicate (CaAl2Si2Os).

packer.

n: a phenomenon in which a decrease in the diameter of the borehole occurs because a plastic substance, such as salt, is being drilled. Since the temperature of the salt is higher than normal for a given depth (high temperature causes the salt to expand) and since mud weight is usually decreased when drilling such formations to maintain high penetration rates (thus decreasing the hydrostatic pressure exerted on the salt),the section of borehole in the salt zone can expand and possibly stick the drill stem. Also called salt squeeze.

n: Permanent mechanical or physical alteration that does not include rupture. Plastic deformation of rocks typically occurs at high temperatures and pressures, conditions under which rocks become relatively viscous.

a stress level, beyond the elastic limit, that produces yielding in tubulars.

n: an absolute flow property indicating the flow resistance of certain types of fluids. It is a measure of shearing stress.

n: a measure of internal resistance of fluid attributable to the amount,type and size of solids present in a given fluid. It is expressed as the number of dynes per sq cm of tangential shearing force in excess of the bingham yield value that will induce a un

an absolute flow property indicating the flow resistance of certain types of fluids. A measurement of shear stress.

a type of choke that is suitable for high volume and can stand some solids.