Lignosulfonate-acrylic acid graft copolymers as sacrificial...

Details Lignosulfonate-acrylic acid graft copolymers as sacrificial... Lignosulfonate-acrylic acid graft copolymers as sacrificial...

2005-09-13

2005-09-13

Suchfield, George A. (Department: 3506)

Wells

Processes

Distinct, separate injection and producing wells

C166S270100, C166S275000, C507S207000, C507S255000

Reexamination Certificate

active

06942031

ABSTRACT:
The invention is a method for improving conformance during a carbon dioxide foam flood, which comprises injecting into the formation an aqueous solution of about 0.05% to about 5% by weight of a carbon dioxide foaming surfactant, and about 0.05% to about 5% by weight of a lignosulfonate-acrylic acid graft copolymer having about 2% to about 70% by weight of acrylic acid, and injecting into the formation carbon dioxide to sweep the hydrocarbons towards a production well for recovery.

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