دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

a correction factor for the Darcy Equation to account for changes in pressure and fluid saturation along a fracture.

oil, gas, coal. The source of the energy may also have bearing on the definition. Unconventional hydrocarbon energy sources include shale oil (both mature and immature),shale gas, and tight gas (ultra low permeability, usually less than 0.001 millidarcy)

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

a flow test in which the flow rate is measured at four drawdowns to estimate how skin changes at each rate. Useful for identifying non Darcy skin or turbulent skin.

the Darcy equation describing linear movement of fluids in laminar flow through a porous media.

abbr: 1,000 cubic feet of gas per day. md abbr: millidarcy (pI, millidarcys).

millidarcy, 1/1000th of a Darcy.

n: (md) (pI, millidarcys) onethousandth of a darcy,

1/1000th of a Darcy.

a flow regime departing from the laminar flow region where Darcy flow is measurable. Generally turbulence.

n: 1. a measure of the ease with which a fluid flows through the connecting pore spaces of rock or cement. The unit of measurement is the rnilIidarcy. 2. fluid conductivity of a porous medium. 3. ability of a fluid to flow within the interconnected pore network of a porous medium. See absolute permeability, effective permeability, relative permeability.

n: the units of permeability are darcies or millidarcies.