دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

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 body of fluid at rest. It increases directly with the density and the depth of the fluid and is expressed in pounds per square inch or kilopascals. The hydrostatic pressure of fresh water is 0.433 pounds per square inch per foot (9. 792 kilopascals per metre) of depth. In drilling. the term refers to the pressure exerted by the drilling fluid in the wellbore. In a water drive field. the term refers to the pressure that may furnish the primary energy for production.

n: the load exerted by a column of fluid at rest.hydrostatic pressure increases uniformly with the density and depth of the fluid.

pressure created by a column of fluid that expresses uniform pressure in all dirrectins at a specific depth and fluid composition above the measurement point.

n: pressure exerted with depth by drilling fluid. Often expressed in pounds per square inch per foot. Also called pressure gradient.

n: the pressure per unit of length that the mud volumn enforces.

n: formation fluid pressure equivalent to about 0.465 pounds per square inch per foot (10.5 kilopascals per metre) of depth from the surface. If the formation pressure is 4,650 pounds per square inch (32,062 kilopascals) at 10,000 feet (3,048 metres),it is considered normal.

n: a measure of the amount of pressure in pounds per square inch that a column of fluid (such as drilling mud) exerts on the bottom of the column for every foot of its length. For ex- ample, 10 pounds per gallon mud exerts 0.52 pounds per square inch per foot (11.8 kilopascals per metre),so a column of 10 pounds per gallon (1,198.2 kilograms per cubic metre) mud that is 1,000 feet (304.8 metres) long exerts 520 pounds per square inch (3.6 megapascals) at the bottom of the column. See pressure gradient.

n: 1. a scale of pressure differences in which there is a uniform variation of pressure from point to point. For example, the pressure gradient of a col- umn of water is about 0.433 pounds per square inch per foot (9.794 kilopascals per metre) of vertical elevation. The normal pressure gradient in a formation is equiva- lent to the pressure exerted at any given depth by a column of 10 percent salt water extending from that depth to the surface (0.465 pounds per square inch per foot, or 10.518 kilopascals permebe). 2. the change (along a horizontal distance) in atmospheric pressure. Isobars drawn on weather maps display the pressure gradient.

n: the variation of pressure with depth.commonly used under hydrostatic conditions(e.g. a hydrostatic column of salt water has a pressure gradient of 0.465 psi/ft).

change in pressure with depth.

abbr: pounds per square inch per foot.