Oil reservoir permeability control

Details Oil reservoir permeability control Oil reservoir permeability control

1988-10-07

1991-03-26

Marquis, Melvyn I.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

166275, 166292, E21B 4316, C08L 7102

Patent

active

050030060

ABSTRACT:
The permeability of a subterranean oil-bearing formation is controlled by the injection of an aqueous solution of a cross-linked block copolymer containing polar and non-polar segments, with the polar segments generally making up as least 50 percent, usually 60 to 99 percent, of the copolymer. The polar segments are derived from an alkylene oxide and the non-polar segments from styrene or an alkyl styrene either by itself or with a diene. The copolymers are cross-linked with an amino resin or a combination of a phenolic and a water-dispersible aldehyde component. The resulting copolymer gels are stable at low pH conditions, such as those of CO.sub.2 flood conditions.

REFERENCES:
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patent: 4018286 (1977-04-01), Gall et al.
patent: 4157322 (1979-06-01), Colegrove
patent: 4210206 (1980-07-01), Ely et al.
patent: 4498540 (1985-02-01), Marrocco
patent: 4505827 (1985-03-01), Rose et al.
patent: 4613631 (1986-09-01), Espenscheid et al.
patent: 4653585 (1987-03-01), Chung et al.
patent: 4716966 (1988-01-01), Shu
Ser. No. 31,736, 10/11/88, Chu et al.

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