دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: a unit of gross heating value equal to 100,000 6tu (1.055056108 joules).

a measure of heat content, where one therm = 100,000 btus.

expansion of the volume (length & diameter) of an object as it is heated. In tubing, heat increases lengthen the tube or increase axial stress.

a measurement of the processing of kerogen towards dry methane gas. Usually expressed at Vitronite reflection percent. Vro <0.6 is a immature oil, 0.6 to 1.0 is a oil with dissolved gas, 1.0 to 1.3 is wet gas and >1.4 is dry gas. Vro over values of about

n: neutron having an average energy level at room temperature of 0.025 electron volts.

n: a type of improved recovery in which heat is introduced into a reservoir to lower the viscosity of heavy oils and to facilitate their flow into producing wells. The pay zone may be heated by injecting steam (steam drive) or by injecting air and burning a portion of the oil in place (in situ combustion). See cyclic steam injection, in situ combustion, steam drive.

an enhanced oil recovery process that uses heat to reduce oil viscosity.

n: a temperature-sensitive element with variable resistivity for overload protection in motors.

n: a device consisting of two dissimilar metals bonded together, with electrical connections to each. When the device is exposed to heat, an electrical current is generated, the magnitude of which varies with the temperature. It is used to measure temperatures higher than those that can be measured by an ordinary thermometer, such as those in engine exhaust.

n: an instrument that measures temperature. Thermometers provide a way to estimate temperature from its effect on a substance with known characteristics (such as a gas that expands when heated). Various types of thermometers measure temperature by measuring the change in pressure of a gas kept at a constant volume, the change in electrical resistance of metals, or the galvanic effect of dissimilar metals in contact. The most common thermometer is the mercury-filled glass tube, which indicates temperature by the expansion of the liquid mercury.

n pI: any of a variety of materials often used in pipe coatings, the molecular structure of which allows them to soften repeatedly when heated and harden when cooled.