Method and compositions for reducing the permeabilities of subterranean zones
AssigneeHalliburton Energy Services, Inc.
InventorMary Anne Hardy
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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® and/or N-vinylpyrrolidone into the zone and then allowing the aqueous composition to form a cross-linked gel in the zone.
Claims17
A method of reducing the permeability of a subterranean zone comprising the steps of:
- (a) introducing an aqueous composition comprised of water, a chelated organic gelling agent comprised of a metal ion chelated water soluble polyalkylene imine and a water soluble polymer capable of being cross-linked by said gelling agent into said zone;
- and then
- (b) allowing said aqueous composition to form a cross-linked gel in said zone.
Dependencies are inferred from the claim text.