Oilfield Terminology & Definitions.
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Reservoir Management & Improved Recovery

Reservoir management involves monitoring and adjusting production strategies to maintain pressure, optimize fluid flow, and extend field life. Improved recovery techniques such as water flooding, gas injection, and enhanced oil recovery increase the amount of extractable hydrocarbons.

  • Secondary Recovery
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    In the lifecycle of an oil and gas reservoir, primary recovery typically yields only a small fraction of the original oil in place (OOIP), often…

  • Solution Gas Drive
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    Solution gas drive, also known as depletion drive, is a primary oil recovery mechanism in which the energy required to move oil from the reservoir…

  • Steam Injection
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    Steam injection is a thermal enhanced oil recovery (EOR) method that introduces high-temperature steam into a reservoir to reduce oil viscosity, improve mobility, and displace…

  • Steam-Assisted Gravity Drainage (SAGD)
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    Steam-Assisted Gravity Drainage (SAGD) is an advanced enhanced oil recovery (EOR) technique specifically designed to extract heavy crude oil and bitumen from deep, unconsolidated reservoirs…

  • Surfactant Flooding
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    Surfactant Flooding is an enhanced oil recovery (EOR) technique in which a dilute solution of surface-active agents (surfactants) is injected into a reservoir to mobilize…

  • Sweep Efficiency
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    Sweep Efficiency is a dimensionless measure of the effectiveness of a displacement process in a petroleum reservoir. It quantifies the fraction of the reservoir volume…

  • Tertiary Recovery
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    Tertiary Recovery, also known as Enhanced Oil Recovery (EOR), is the third stage of oil production applied to a reservoir after primary and secondary recovery…

  • Thermal Recovery
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  • Vertical Sweep Efficiency
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    Vertical Sweep Efficiency (VSE), often referred to as vertical conformance, is a dimensionless metric (typically expressed as a percentage) that quantifies how effectively a displacing…

  • Voidage Replacement Ratio (VRR)
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    The Voidage Replacement Ratio (VRR) is a critical dimensionless metric used in reservoir management to quantify the balance between the volume of fluids withdrawn from…

  • Water Cut
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    Water Cut (often abbreviated as WC or %WC) is a fundamental production metric in the oil and gas industry that quantifies the volume fraction of…

  • Waterflooding
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    Waterflooding is a secondary oil recovery technique in which water is injected into a reservoir to maintain pressure and physically displace oil toward production wells.…