دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: the standard unit of gamma ray measurement. Standardisation of this unit results from the normalisation of the detector-measurement systems of all primary service companies in the API test pits at the University of Houston. The API gamma ray unit is defined as 1/200 of the difference in log deflection between two zones of different gamma ray intensity. The test pit is constructed so that the average midcontinent shale will record about 100 API gamma ray units.

n: the measure of the density or gravity of liquid petroleum products in the United States;derived from relative density in accordance with the following equation: API gravity at 60ﾰF = [141.5 + relative density 60/60ﾰF] -131.5 API gravity is expressed in degrees, 1 D. API being equivalent to 1.0, the specific gravity of water. See gravity.

n: A measure of the density of liquid petroleum products, expressed in degrees. It can be derived from the following equation: API gravity (degree) =141.5/specific gravity-131.5

the relative density of a hydrocarbon based on a scale of degrees API. Density in g/cc = (141 / (131 +API)).

a stamp indicating that the item is manufactured to API specifications.

n: the standard unit of measurement for neutron logs. Standardisation of this unit results from the calibration of each logging tool model in the API neutron test pit at the University of Houston.

a recommended practice published by the API.

n: The solid particle that can not pass the American NO.200 standard sieve, that is refered to the solid particle whose diameter is bigger that 74um.

the unit of radioactivity used for natural gamma-ray logs.

n: Mixed iron ore and barite to reach the density of 4.20 and coincide with API criterion.

abbr: after payout;commonly used in the land department of an oil company.

n: the algebraic sum of the actual compressibility of a liquid and the volume change per unit volume of the confining container caused by a unit change in pressure at constant temperature.