Oil and gas terminology · MLC-0103

Oil and gas terms: V (68)

• Validation dataA subset of a dataset used to evaluate the performance of a machine learning model during its training phase...
• VAMAA copolymer of Vinyl Acetate and Maleic Anhydride used as a high-temperature fluid-loss control additive in...
• Vapor extraction (vapex)A recovery method for heavy oil and bitumen that injects a solvent vapor, such as propane or butane, into the...
• Vapor pressureThe pressure at which a liquid and its vapor are in equilibrium at a specific temperature within a closed...
• Vapor recovery unitA system designed to capture hydrocarbon vapors that would otherwise be vented to the atmosphere from storage...
• Vaporizing driveA miscible gas injection process where the injected gas vaporizes components from the crude oil, creating a...
• Variable orificeA flow control device that allows the size of its opening to be adjusted, thereby regulating the flow rate of...
• Variable rateA condition in well testing where the flow rate of a well changes over time, rather than remaining constant...
• Variable-density logA type of acoustic log presentation that displays the amplitude and waveform of the received sonic signal as...
• Varimax rotationA statistical method applied during factor analysis to simplify and clarify the interpretation of large...
• VariogramA geostatistical tool that quantifies the spatial correlation or variability between data points as a...
• VarveA pair of sedimentary layers, typically deposited annually in glacial lakes, consisting of a coarser...
• Vee-doorAn opening at the base of the derrick, typically shaped like a 'V', through which drill pipe, casing, and...
• VelocityThe speed and direction at which a seismic wave propagates through a medium, typically measured in meters per...
• Velocity analysisThe process of determining the speed at which seismic waves travel through different subsurface layers. This...
• Velocity anomalyA localized region where seismic velocity differs markedly from the surrounding or expected background value...
• Velocity correctionAn adjustment applied to seismic travel times to compensate for variations in the speed of sound through...
• Velocity correction factorThe factor that converts the single-phase fluid velocity measured at the pipe center, where a spinner sits...
• Velocity layeringThe stratification of subsurface materials into distinct layers, each characterized by a different seismic...
• Velocity mapA two-dimensional representation of seismic wave velocities within a subsurface volume, derived from...
• Velocity shot measurementA technique used in production logging to determine fluid velocity by injecting a small, distinct 'shot' of a...
• Velocity stringA small-diameter tubing string installed inside the existing production tubing of a gas well. Its purpose is...
• Vent plugA small, removable plug or cap designed to relieve pressure or allow for the escape of gases from a sealed...
• Venturi valveA type of valve designed with a constricted throat, similar to a Venturi tube, which accelerates fluid flow...
• VerificationThe process of confirming that a product, service, or system meets specified requirements. In formation...
• Verification listingA detailed record or report documenting the checks and procedures performed to confirm the accuracy and...
• VersenateA chemical compound, typically ethylenediaminetetraacetic acid (EDTA), used in drilling fluid analysis to...
• Vertical displacement efficiencyThe fraction of oil displaced from the swept portion of a reservoir in the vertical direction. It quantifies...
• Vertical liftThe process of moving reservoir fluids from the bottom of the wellbore to the surface against gravity and...
• Vertical resistivityThe electrical resistivity of a formation measured in the direction parallel to the borehole axis. This...
• Vertical resolutionThe ability of a logging tool to distinguish between two closely spaced features along the axis of the...
• Vertical responseThe characteristic reading of a logging tool as it passes a boundary between two rock layers with different...
• Vertical seismic profile (VSP)A technique where a seismic source on the surface generates signals recorded by geophones placed at many...
• Vertical separatorA cylindrical pressure vessel oriented vertically, used to separate oil, gas, and water from a wellstream...
• Vertical severanceThe division of a mineral estate into different ownerships based on depth, where one party owns the rights to...
• Vertical sweep efficiencyThe fraction of the reservoir's vertical cross-section that is contacted by the injected fluid during a...
• Vertical transverse isotropy (VTI)A specific type of seismic anisotropy where the elastic properties of the medium are isotropic in the...
• Very large crude carrierA class of supertankers used for transporting large quantities of crude oil, typically with a deadweight...
• VesicleA small, bubble-like cavity within an igneous rock, formed by the expansion of gases during the...
• VesicularDescribing a rock texture characterized by numerous small cavities, called vesicles, which are formed by the...
• Vesicular porosityThe pore space within an igneous rock created by gas bubbles that were trapped during the solidification of...
• VG meterA rotational viscometer, such as a Fann viscometer, used to measure the rheological properties of drilling...
• VibratorA heavy vehicle-mounted device used as a seismic source on land, which generates seismic waves by vibrating a...
• Vibratory seismic dataSeismic data acquired using vibrator trucks as the energy source, which generate controlled, repeatable...
• Vinyl acetate-maleic anhydride copolymerA synthetic polymer used as a fluid loss control additive in water-based drilling fluids. It functions by...
• Vinyl polymerA type of synthetic polymer formed from vinyl monomers, often used as a fluid loss control agent...
• Virgin pressureThe initial reservoir pressure before any production of hydrocarbons or injection of fluids has occurred...
• Virgin zoneThe undisturbed portion of a reservoir formation located beyond the invaded zone, where the original...
• VisAn abbreviation for viscosity, a measure of a fluid's resistance to flow. In drilling fluids, it indicates...
• ViscosityA fluid's internal resistance to flow, resulting from intermolecular friction. In drilling operations, it...
• Viscosity and gel-strength testA standard procedure to measure the flow properties of a drilling fluid using a direct-indicating viscometer...
• Viscous fingeringAn instability that occurs during fluid displacement in porous media when a less viscous fluid displaces a...
• Viscous forceThe resistance to flow within a fluid or between a fluid and a solid surface, arising from the fluid's...
• Viscous oilCrude oil characterized by a high resistance to flow, typically due to its molecular composition and...
• Visible position indicatorA mechanical device attached to a valve stem or actuator that visually displays the current open or closed...
• VitriniteA maceral group in coal and dispersed organic matter, derived primarily from the woody tissues of plants. It...
• Vitrinite reflectanceThe percentage of incident light reflected from polished vitrinite particles in a rock sample, measured under...
• VLCCA Very Large Crude Carrier, a type of supertanker designed for the long-distance transport of crude oil, with...
• VolcanicRelating to or originating from a volcano or volcanic activity, including the eruption of molten rock, ash...
• VolcanoA vent in the Earth's crust through which molten rock (magma), ash, and gases erupt from the interior onto...
• Volumetric cross sectionThe photoelectric absorption cross section of a formation per unit volume, symbol U, found as the...
• Volumetric displacement efficiencyThe fraction of the pore volume within the swept zone of a reservoir from which oil has been displaced by an...
• Volumetric efficiencyThe ratio of the actual volume of fluid pumped by a positive displacement pump, such as a mud pump, to the...
• Volumetric sweep efficiencyThe fraction of the total reservoir volume that is contacted by the injected fluid during a displacement...
• VugA relatively large, irregular cavity within a rock, often lined with mineral crystals, formed by the...
• VuggyDescribing a rock texture characterized by the presence of vugs, which are relatively large, irregular...
• VugularDescribing a type of secondary porosity in carbonate or evaporite rocks characterized by cavities, or vugs...
• Vugular porosityThe porosity within a rock created by the presence of vugs, which are relatively large, irregular cavities...

68 of 4,469 terms in Oil and gas terminology (MLC-0103). Request the full dataset.