دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: the number of Btus contained in a cubic foot of natural gas adjusted to reflect the actual water content of the gas at delivered pressure, temperature, and gravity conditions.

the amount of heat input required to raise the temperature of one pound of water by 1oF at water’s maximum density at 39oF. It is approximately equal to 1 kilojoule.

n: a measure of heat energy equivalent to the amount of heat needed to raise 1 pound of water 1ﾰF at or near its point of maximum density (39.1ﾰF). Equivalent to 0.252 kilogram- calorie or 1,055 joules.

British Thermal Unit.

the maximum BTU’s that can be released from a burner while burning with a stable flame and satisfactory combustion.

n: a drilling bit with tungsten carbide inserts on the cones that resemble plugs or buttons. See roller cone bit.

nn: The cone bit which is installed with obtuse tungsten carbide insert.

n pi: a laboratory analysis of a gas sample to determine me composition of me gas. The analysis will determine the percentage of each component of the gas;this percentage can be used to calculate liquid volume percentage, GPMs, Btu, and gravity.

the heat value per unit of fuel expressed in Btu as determined from tests of fuel samples. Examples: Btu per pound of coal, per gallon of oil, per cubic foot of gas (AGA).

a conversion of all gas forms to a comparison oil volume. Conversion factors are usually 5.6 to 6.0 mscf (depending on btu of the gas) to 1 bbl of oil.

n: a measure of heating value for natural gas that is free of moisture. Contractually, natural gas may be defined as dry" even though it does contain some water vapor, typically less than 7 pounds per million cubic feet (3.2 kilograms per million cubic metres). This standard of measurement reflects the conditions under which natural gas is usually actually delivered for first sales.