Crosslinkable Water Soluble Compositions And Methods Of Using The Same
AssigneeBaker Hughes, A Ge Company, LLC
InventorSumit Bhaduri
Life of this patent
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Abstract
Water and gas flow into a subterranean reservoir may be reduced by pumping into the reservoir a multi-aldehyde crosslinking agent and a low molecular weight polyacrylamide capable of crosslinking with the crosslinking agent. The reaction product forms a gel plug impermeable to water and gas.
Claims30
A method for reducing the permeability of a subterranean reservoir penetrated by a wellbore which comprises pumping into the reservoir through the wellbore:
- (a) a polyacrylamide having a weight average molecular weight between from about 10,000 to about 1,000,000;
- (b) a multi-aldehyde crosslinking agent;
- and
- forming a fluid impermeable plug in the formation from the gelled reaction product of the polyacrylamide and crosslinking agent.
A method for reducing flow into a porous thief zone penetrated by a water injection wellbore which comprises:
- (a) pumping into the wellbore and into the porous thief zone:
- (i) a polyacrylamide having a weight average molecular weight between from about 10,000 to about 1,000,000;
- (ii) a multi-aldehyde crosslinking agent;
- and
- (b) forming a fluid impermeable plug from the reaction product of the polyacrylamide and multi-aldehyde crosslinking agent in the porous thief zone.
A method of reducing fluid loss to a porous subterranean formation penetrated by a wellbore comprising:
- (a) pumping into the wellbore and/or in an annular space:
- (i) a polyacrylamide having a weight average molecular weight between from about 10,000 to about 1,000,000;
- (ii) a multi-aldehyde crosslinking agent;
- and
- (b) gelling in the formation the reaction product of the polyacrylamide and the crosslinking agent;
- and
- (c) forming a fluid impermeable plug in the formation from the reaction product wherein the fluid impermeable plug reduces the loss of fluid to a permeable zone of the subterranean formation.
Dependencies are inferred from the claim text.