دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

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: The abnormal pressure per meter in depth, usually express as MPa/m. It is the reference
of density of the mud and the procedure of the casing design.

a measurement in the well of the pressure vs. depth. Useful for spotting liquid levels, leaks, fluid entries, etc.

n: a concept that avert application layer pressure gradient

by wrong.

n: see fracture gradient. frac job n: see formation fracturing.

n: The pressure gradient, generally stated in psi/ft [kPa/m], at which a specific formation interval breaks down and accepts fluid. Determining the frac gradient is a key requirement in designing and analyzing a hydraulic fracturing treatment.

n: the pressure gradient (psi/foot) at which a formation accepts whole fluid from the wellbore. Also called frac gradient.

n: a measure of how the strength of the rock (i.e.its resistance to breakdown) varies with depth.

the gradient needed to initiate a fracture.

n: usually calculate by fracture extend pressure.

n: in meteorology, a threedimensional layer of large, horizontal pressure gradients.

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 change in geostatic pressure per unit of depth in the earth.