Trona-enhanced steam foam oil recovery process

Details Trona-enhanced steam foam oil recovery process Trona-enhanced steam foam oil recovery process

1987-02-17

1988-03-01

Novosad, Stephen J.

Wells

Processes

Distinct, separate injection and producing wells

166272, 166274, 166303, E21B 4324

Patent

active

047279389

ABSTRACT:
In a continuous or cyclic steam foam drive, recovery of an acidic reservoir oil (1) is improved by injecting steam accompanied by (a) enough dissolved alkaline monovalent salt to ion-exchange multivalent cations from the reservoir rocks and precipitate those ions in compounds which are insoluble in an alkaline aqueous liquid as well as forming soaps of the reservoir oil acids and (b) surfactants for foaming the steam and increasing the salt tolerance of an aqueous surfactant system containing the soaps of the reservoir oil acids, and (2) is further improved by using trona or an equivalent mixture of alkali metal carbonates and bicarbonates as the alkaline monovalent salt.

REFERENCES:
patent: 3690376 (1972-09-01), Zwicky et al.
patent: 3977470 (1976-08-01), Chang
patent: 4004638 (1977-01-01), Burdyn et al.
patent: 4086964 (1978-05-01), Dilgren et al.
patent: 4393937 (1983-07-01), Dilgren
patent: 4502541 (1985-03-01), Lawson et al.
patent: 4532993 (1985-08-01), Dilgren et al.
patent: 4607695 (1986-08-01), Weber

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