Wells – Processes – Distinct – separate injection and producing wells
Patent
1987-04-30
1988-10-11
Novosad, Stephen J.
Wells
Processes
Distinct, separate injection and producing wells
166275, 166292, 166295, 252 8554, E21B 4316
Patent
active
047763981
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.
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Chu A. S.
Chung Harold S.
Hoskin Dennis H.
Mitchell Thomas O.
Shu Paul
Aksman Stanislaus
Gilman Michael G.
Kisliuk Bruce M.
McKillop Alexander J.
Mobil Oil Corporation
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