دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: the viscosity of a drilling fluid as measured with a directindicating, or rotational, viscometer.

n: The viscosity a fluid appears to have on a given instrument at a stated rate of shear. It is a function of the plastic viscosity and the yield point. The apparent viscosity in centipoises, as determined by the direct-indicating viscometer, is equal to the

the viscosity at a given shear rate and a given temperature.

n: (cp) one-hundredth of a poise;a measure of a fluids viscosity, or resistance to flow.

viscosity measurement, 1/100th of a poise.

n: the cohesion of the individual particles of a given materal (i.e., its ability to deform or its resistance to flow).

n: The viscosity of a non-reversible fluid, in poises, for a certain time interval at a given pressure and temperature.

a fluid’s ability to deform and flow and its general cohesion to itself.

n: (Pl. darcys) a unit of measure of permeability. A porous medium has a permeability of 1 darcy when differential pressure of 1 atmosphere across a sample 1 centimetre long and I square centimetre in cross section will force a liquid of 1 centipoise of viscosity through the sample at the rate of 1 cubic centimetre per second. The permeability of reservoir rocks is usually so low that it is measured in millidarcys.

n: A unit of permeability. A porous medium has a permeability of 1 darcy when a pressure of 1 atm on a sample 1 cm long and 1 sq cm in cross section will force a liquid of 1 cP viscosity through the sample at the rate of 1 cc per sec.

a measurement of permeability (ability of fluids to flow through the rock). The relationship is an empirical law which states that the velocity of flow through porous media is directly proportional to the hydraulic gradient, assuming that the flow is lami

n: the viscosity of a liquid in which a force of 1 dyne (a unit of measurement of small amounts of force) exerted tangentially on a surface of 1 square centimebe of either of two parallel planes 1 centimetre apart will move one plane at the rate of 1 centimetre per second in reference to the other plane, with the space between the two planes filled with the liquid.

in the example or laminar flow for Newtonian fluids, the volume flow rate is given by the pressure differential (inlet to outlet) divided by the viscous resistance. This resistance depends on fluid viscosity and the length but is dominated by dependence o

n: the consistency of a slurry, measured in poise.

n: A property of fluids and slurries that indicates their resistance to flow, defined as the ratio of shear stress to shear rate.