Dictionary:Enhanced oil recovery (EOR)

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Thermal, miscible, and chemical methods for producing oil left behind in the ground after primary and secondary recovery (q.v.). Thermal enhanced-recovery methods (q.v.) include steam stimulation (huff and puff), steam flooding, and in-situ combustion. Miscible recovery methods (q.v.) include injection of hydrocarbons, carbon dioxide, and nitrogen. Chemically enhanced recovery (q.v.) includes flooding with polymers, surfactants, and alkaline fluids.