Gravity stable surfactant flooding in gas depleted reservoirs

Details Gravity stable surfactant flooding in gas depleted reservoirs Gravity stable surfactant flooding in gas depleted reservoirs

E - Fixed Constructions

21

B

166/33

E21B 43/22 (2006.01) C09K 8/58 (2006.01) E21B 43/20 (2006.01)

Patent

CA 1298781

GRAVITY STABLE SURFACTANT FLOODING IN GAS DEPLETED RESERVOIRS (D#78,779-F) ABSTRACT OF THE DISCLOSURE The invention is a method of recovering hydrocarbons from an underground vertical hydrocarbon reservoir having a substantial vertical thickness, an oil saturation relatively near residual oil saturation to gas, and at least one injection well and one production well penetrating the reservoir. The method comprises injecting a surfactant slug into the bottom of the reservoir above any water zone or aquifer, and driving the surfactant slug upwards through the reservoir by the use of some driving force. The driving force may be supplied by one or more of a combination of methods comprising producing the gas cap of the reservoir, producing hydrocarbons banked above the surfactant slug, or injecting fluid below the surfactant slug. Hydrocarbons are recovered at one or more production wells.

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