BLOCK COPOLYMERS FOR RECOVERING HYDROCARBON FLUIDS FROM A SUBTERRANEAN RESERVOIR
First Claim
1. A composition comprising:
- highly cross linked expandable polymeric microparticles comprising unexpanded volume average particle size diameters of about 0.05 to about 5,000 microns and cross linking agent contents of about 100 to about 200,000 ppm of labile cross linkers and from 0 to about 300 ppm of non-labile cross linkers, wherein the expandable polymeric microparticles have a block copolymer structure comprising at least two different monomers having different chemical structures.
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Abstract
The present disclosure is directed to compositions and methods that may be used for enhanced oil recovery, for modifying the permeability of subterranean formations and for increasing the mobilization and/or recovery rate of hydrocarbon fluids present in the formations. The compositions may include, for example, expandable cross-linked polymeric microparticles having unexpanded volume average particle size diameters of from about 0.05 to about 5,000 microns and cross linking agent contents of from about 100 to about 200,000 ppm of labile cross linkers and from 0 to about 300 ppm of non-labile cross linkers, wherein the expandable polymeric monomers have a block copolymer structure comprising at least two different monomers having different chemical structures.
23 Citations
20 Claims
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1. A composition comprising:
highly cross linked expandable polymeric microparticles comprising unexpanded volume average particle size diameters of about 0.05 to about 5,000 microns and cross linking agent contents of about 100 to about 200,000 ppm of labile cross linkers and from 0 to about 300 ppm of non-labile cross linkers, wherein the expandable polymeric microparticles have a block copolymer structure comprising at least two different monomers having different chemical structures. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 15, 16, 17, 18, 19, 20)
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10. The composition of claim 10, wherein the composition is in the form of an emulsion or aqueous suspension.
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11. The composition of claim 11, wherein at least one of the cross linked polymeric microparticles is anionic.
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12. The composition of claim 12, wherein the anionic polymeric microparticle is prepared by free-radical polymerization from about 95 to about 10 mole percent of nonionic monomers and from about 5 to about 90 mole percent anionic monomers.
- 13. The composition of claim 13, wherein the nonionic monomer is acrylamide and the anionic monomer is 2-acrylamido-2-methyl-1-propanesulfonic acid.
Specification