دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

a reference to the amount of time that a given volume of fluid spends in a location. Related to fluid holdup and separation. Used in both surface separators and mud removal times.

n: the portion of hydrocarbons that cannot be removed by ordinary producing mechanisms when a porous reservoir has been saturated with hydrocarbons. This value is usually a specific percentage of the pore volume. In the case of gas, the volume, measured at standard conditions, that is retained in a reservoir as residual gas saturation is an inverse function of the pressure, due to the effect of the gas laws.

short wavelength component of field density variations within high density basement and/or low density overburden. Anomalies in the residual field are usually of interest in general exploration.

n: 1. in improved recovery, oil remaining in a reservoir after an improved recovery method has been applied and displacement has occurred. 2. in petroleum refining, the combustible, viscous, or semiliquid bottoms product from crude oil distillation, used as adhesives, roofing compounds, asphalt, low-grade fuels, and sealants.

n: opposition to the flow of direct current caused by a particular material or device. Resistance is equal to the voltage drop across the circuit divided by the current through the circuit.

n: a record of the resistivity of a formation. Usually obtained when an electric log is run. See resistivity well logging.

one of various logs that measure some component of resistivity.

n: the recording of the resistance of formation water to natural or induced electrical current. The mineral content of subsurface water allows it to conduct electricity. Rock, oil, and gas are poor conductors. Resistivity measurements can be correlated to formation lithology, poros- ity, permeability, and saturation and are very useful in formation evaluation. See electric well log.

n: a kind of logging method in which the resistivity of rock is measured, usually used to evaluate the formation oiliness

n: a component that tends to impede the flow of electric current, usually without any inductive or capacitive effects. Often used in conjunction with a voltmeter.

n pi: concentrations of naturally occurring liquid or gaseous hydrocarbons in the earths crust. some part of which are currently or potentially economically extractable. Some categories of resources are (1) from the economic standpoint. economic (recoverable, commercial),marginally economic, and subeconomic;and (2) from the geological standpoint, identified (subdi- vided into measured, indicated, and inferred),and undiscovered.