دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: A formation pressure that is higher than the normal formation fluid hydrostatic pressure.

n: pressure exceeding or falling below the pressure to be expected at a given depth. Normal pressure increases approximately 0.465 pow1ds per square inch per foot of depth or 10.5 kilopascals per metre of depth. Thus, normal pressure at 1,000 feet is 465 pounds per square inch;at 1,000 metres it is 10,500 kilopascals. See pressure gradient.

n: A formation pressure that deviates from the normal formation fluid hydrostatic pressure. Such pressure may be classified as "subnormal" (lower than normal) or "overpressured" (higher than normal).

n: 1. the pressure at the bottom of a borehole. It is caused by the hydrostatic pressure of the wellbore fluid and, sometimes, by any back-pressure held at the surface, as when the well is shut in with blowout preventers. When mud is being circulated, bottomhole pressure is the hydrostatic pressure plus the remaining circulating pressure required to move the mud up the annulus. 2. the pressure in a well at a point opposite the producing formation, as recorded by a bottomhole pressure bomb.

n: The pressure at the bottom of the borehole, or at a point opposite the production formation.

n: the amount of force needed to crush the sides of pipe until it caves in on itself. The pipe collapses when the pressure outside it is greater than the pressure inside it.

n: The required pressure collapsing casing from outside.

external hydrostatic pressure that will cause the onset of pipe yielding. Heavily influenced by tension loads on the pipe.

n: in drilling, the entrance of formation fluids into the wellbore because hydrostatic pressure is less than formation pressure.

influx into the well bore.

n: abnormally high pressure exerted by some subsurface formations. The deeper the formation, the higher the pressure it exerts on a wellbore drilled into it.

n: The pressure within the Earth, or formation pressure. The common oilfield usage, however, is to indicate anomalous subsurface pore pressure that is higher or lower than the normal, predicted hydrostatic pressure for a given depth, or the pressure exerted

n: The change in pore pressure per unit depth, typically in units of pounds per square inch per foot (psi/ft) or kilopascals per meter (kPa/m). The geopressure gradient might be described as high or low if it deviates from the normal hydrostatic pressure gra

n: the force exerted by a column of liquid expressed by the height of the liquid above the point at which the pressure is measured. Although head" refers to distance or height, it is used to express pressure, since the force of the liquid column is directly proportional to its height. Also called head or hydrostatic head. Compare hydrostatic pressure.

n: The force per unit area exerted by a column of liquid at a height above a depth (and pressure) of interest. Fluids flow down a hydraulic gradient, from points of higher to lower hydraulic head. The term is sometimes used synonymously with hydrostatic head

pressure exerted by a column of liquid.

n: a sand bailer that consists of a sealed cylinder with a rubber disk and a piercing tool at the bottom. A sharp blow on the bottom ruptures the disk. allowing the hydrostatic pressure of the well fluid to force sand into the bailer.

n: see hydrostatic pressure.

n: the pressure exerted by a body of liquid at rest. The hydrostatic head of fresh water is 0.433 psi per foot of height.those of other liquids may be determined by compairing their specific gravities with the specific gravity of water.