Simultaneous microemulsion-aqueous phase flooding process

Details Simultaneous microemulsion-aqueous phase flooding process Simultaneous microemulsion-aqueous phase flooding process

1978-12-21

1980-12-23

Novosad, Stephen J.

Wells

Processes

Distinct, separate injection and producing wells

166252, 166274, 166275, E21B 4322

Patent

active

042405041

ABSTRACT:
A method of enhanced oil recovery is disclosed wherein an upper-phase or a middle-phase microemulsion and an immiscible aqueous phase are simultaneously injected into a subterranean formation. The viscosities of the injected phases are adjusted so that the aqueous phase/microemulsion viscosity ratio approximates the reservoir brine/oil viscosity ratio. The injection rates of the injected phases are such that similar oil, microemulsion and aqueous phase velocities are achieved in the reservoir. Oil is displaced to a production well and recovered.

REFERENCES:
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patent: 3500922 (1970-03-01), O'Brien et al.
patent: 3561530 (1971-02-01), Tosch
patent: 3605895 (1971-09-01), Jones
patent: 3768560 (1973-10-01), Hill et al.
patent: 3770056 (1973-11-01), Campbell et al.
patent: 3885628 (1975-05-01), Reed et al.
patent: 3938591 (1976-02-01), Ossip et al.
patent: 3981361 (1976-09-01), Healy
patent: 3983940 (1976-10-01), Carpenter, Jr. et al.
patent: 4013125 (1977-03-01), Plummer et al.
patent: 4125156 (1978-11-01), Glinsmann
Szabo, M. T., "Some Aspects of Mobility Buffer Design in Surfactant Flooding," SPE 6201, 1976.
Szabo, M. T., "The Effect of Sulfonate/Polymer Interaction on Mobility Buffer Design," Society of Petroleum Engineers Journal, Feb. 1979. pp, 4-14.

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