دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: the value obtained when the absolute dynamic viscosity is divided by the density (expressed in grams per cubic centimetre) of the liquid at the temperature concerned.

abbr: cubic centimetre.

n: 1. the ratio of the absolute discharge pressure from a compressor to the absolute intake pressure. 2. the ratio of the volume of an engine cylinder before compression to its volume after compression. For example, if a cylinder volume of ]0 cubic inches (10 cubic centimetres) is compressed into] cubic inch (] cubic centimetre),the compression ratio is ]0:].

the ratio of the absolute outlet pressure of a compressor to the absolute inlet pressure.

n: (cm3) a commonly used unit of volume measurement in the metric system equal to 10-6 cubic metre, or I millilitre. The volume of a cube whose edge is 1 centimetre.

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: viscosity as measured by the Marsh funnel, based on the number of seconds it takes for 61 cubic inches (1,000 cubic centimetres) of drilling fluid to flow through the funnel.

n: Time, in seconds for one quart of mud to flow through a Marsh funnel. This is not a true viscosity, but serves as a qualitative measure of how thick the mud sample is. The funnel viscosity is useful only for relative comparisons.

a viscosity measurement based on the number of seconds that it takes for 1 liter of fluid to flow through a Marsh funnel.

n: a unit of metric measure of mass and weight equal to 1/1,000 kilogram and nearly equal to 1 cubic centimetre of water at its maximum density.

n: one-thousandth of a litre. In analysing drilling mud. this term is used interchangeably with cubic centimetre. A quart equals 964 millilitres.

n: 1. actual volume of fluid put out by a pump, divided by the volume displaced by a piston or pistons (or other device) in the pump. Volumetric efficiency is usually expressed as a percentage. For example, if the pump pistons displace 300 cubic inches (4,916 cubic centimetres),but the pump puts out only 291 cubic inches (4,769 cubic centimteres) per stroke, then the volumetric efficiency of the pump is 97%. 2. for compressors, the ratio of the volume of gas actually delivered, corrected to suction temperature and pressure, to the piston displacement.