Miscible gas enhanced oil recovery method using oil-brine compat

Details Miscible gas enhanced oil recovery method using oil-brine compat Miscible gas enhanced oil recovery method using oil-brine compat

1987-08-05

1988-08-16

Suchfield, George A.

Wells

Processes

Distinct, separate injection and producing wells

166252, 166274, 166309, 252 8554, E21B 4322

Patent

active

047637307

ABSTRACT:
Oil recovery from a petroleum reservoir using a miscible gas, such as carbon dioxide, nitrogen or methane is enhanced by injecting a preformed stable foam into the reservoir. The foam composition is formed by an effective amount of an alpha olefin sulfonate (AOS) capable of forming a foam with water having a salt content similar to that in the reservoir and the miscible gas. Preferably, the alpha olefin sulfonates have from 8 to 24 carbon atoms. In a preferred form the AOS has on average a carbon content of less than about 12 carbon atoms in higher salt content brines and less than about 12 carbon atoms in lower salt content brines. Most preferably, in brines having a salt concentration of at least 10 weight percent, the AOS has on average about 10 carbon atoms; in brines having a salt concentration of from 2 to 10 weight percent the AOS has on average about 12 carbon atoms; and in brines having less than 2 weight percent salt and AOS has on average about 14 carbon atoms.

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patent: 4572294 (1986-02-01), Duerksen et al.
patent: 4576232 (1986-03-01), Duerksen et al.
patent: 4601336 (1986-07-01), Dilgren et al.

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