Method and compositions for reducing the permeabilities of subterranean zones
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United States of America Patent
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Mar 6, 2001
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N/A
app pub date -
Dec 15, 1998
filing date -
Dec 15, 1998
priority date (Note) -
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Abstract
Methods and compositions for reducing the permeabilities of subterranean zones are provided. The methods of the invention are basically comprised of introducing an aqueous composition comprised of a chelated organic gelling agent and a copolymer of an ethylenically unsaturated polar monomer and an ethylenically unsaturated ester or a terpolymer or tetrapolymer of an ethylenically unsaturated polar monomer, an ethylenically unsaturated ester and a monomer selected from AMPS.RTM. and/or N-vinylpyrrolidone into the zone and then allowing the aqueous composition to form a cross-linked gel in the zone.
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