Harold I Chung

US Patent:

47763981, Oct 11, 1988

Filed:

Apr 30, 1987

Appl. No.:

7/031736

Inventors:

A. S. Chu - Spotswood NJ
Harold S. Chung - Princeton NJ
Dennis H. Hoskin - Lawrenceville NJ
Thomas O. Mitchell - Trenton NJ
Paul Shu - Princeton Junction NJ

Assignee:

Mobil Oil Corporation - New York NY

International Classification:

E21B 4316

US Classification:

166274

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 at 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.

US Patent:

50030060, Mar 26, 1991

Filed:

Oct 7, 1988

Appl. No.:

7/255093

Inventors:

A. S. Chu - Spotswood NJ
Harold S. Chung - Princeton NJ
Dennis H. Hoskin - Lawrenceville NJ
Thomas O. Mitchell - Trenton NJ
Paul Shu - Princeton Junction NJ

Assignee:

Mobil Oil Corporation - Fairfax VA

International Classification:

E21B 4316
C08L 7102

US Classification:

525 92

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.