دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: 1. an instrument to measure electromotive forces by comparison with a known potential difference. 2. a re- sistor used chiefly as a voltage divider.

n: (psig) the pressure in a vessel or container as registered on a gauge attached to the container. This reading does not include the pressure of the atmosphere outside the container.

abbr: Petroleos de Venezuela S.A. peak polished rod load n: the highest load imposed on the polished rod throughout a complete sucker rod pump cycle.

a description of the flow properties (viscosity) of a fluid. Power law fluids are characterized by decreasing viscosity with increasing shear.

n: the power loss that caused by mechanic friction, hydraulic friction and volume loss.

n: a transformer that takes power from a generating station and steps up the voltage for transmission, or that takes power from the transmission line and steps down the voltage to the primary distribution level of? ,200 or 12,400 volts. See distribution transfonner.

n: a natural or artificial siliceous material commonly added to portland cement mixtures to impart certain desirable properties. Added to oilwell cements, pozzolans reduce slurry weight and viscosity, increase resistance to sulfate attack, and influence factors such as pumping time, ultimate strength, and watertightness.

n: A siliceous or siliceous and aluminous material that possesses little or no cementitious value. In a finely divided form and in the presence of moisture, however, pozzolan reacts chemically with calcium hydroxide to form compounds possessing cementitious

abbr: pounds per gallon.

pounds per gallon. Usually used as a measure of additive, slurry or cleanout. Actually it is pounds of proppant in a gallon volume with liquid added to make up the gallon “space”.

n: a substance, usually a solid, that separates from a fluid because of a chemical or physical change in the fluid. v: to separate in this manner.

n: material that separates out of solution or slurry as a solid. Precipitation of solids in a drilling fluid may follow or slurry as a or coagulation, such as the dispersed red-bed clays upon addition of a flocculation agent to the fluid.

n: the degree of conformity to each other of measurements repeated under specified conditions, irrespective of whether they are close or far from the true value.