Oil recovery process using a polymer slug with tapered surfactan

Details Oil recovery process using a polymer slug with tapered surfactan Oil recovery process using a polymer slug with tapered surfactan

1976-09-20

1978-02-21

Novosad, Stephen J.

Wells

Processes

Distinct, separate injection and producing wells

166274, 252 855D, E21B 4322

Patent

active

040747590

ABSTRACT:
A process for recovering oil from a subterranean reservoir in which a slug comprising an aqueous polymer solution containing a small amount of surfactant injected into the formation via an injection well is forced through the formation and oil is recovered via a production well penetrating the formation. In this process the concentration of the surfactant in the slug of the aqueous polymer solution is tapered by increasing the concentration of the surfactant either incrementally, gradually or by any other convenient method during the slug injection time.

REFERENCES:
patent: 3346047 (1967-10-01), Townsend et al.
patent: 3421582 (1969-01-01), Fallgatter
patent: 3476184 (1969-11-01), Davis, Jr.
patent: 3508612 (1970-04-01), Reisberg et al.
patent: 3548941 (1970-12-01), Graham et al.
patent: 3670819 (1972-06-01), Dauben et al.
patent: 3731741 (1973-05-01), Palmer et al.
patent: 3811505 (1974-05-01), Flournoy et al.
patent: 3860597 (1975-01-01), Palmer et al.
patent: 3921716 (1975-11-01), Tate

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