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The present invention relates to subterranean treatment fluids, and more particularly, the present invention relates to subterranean treatment fluids comprising relative permeability modifiers and methods for using such subterranean treatment fluids in subterranean operations to reduce the productio

The present invention relates to subterranean treatment fluids, and more particularly, the present invention relates to subterranean treatment fluids comprising relative permeability modifiers and methods for using such subterranean treatment fluids in subterranean operations to reduce the production of water from and stimulate hydrocarbon production in a subterranean formation. In certain embodiments, the methods of the present invention generally comprise the steps of providing a permeability-modifying aqueous treatment fluid comprising a relative permeability modifier and contacting a subterranean formation with the permeability-modifying aqueous treatment fluid. Optionally, the permeability-modifying aqueous treatment fluid may be injected in the subterranean formation at a pressure sufficient to create or enhance at least one fracture therein. In another embodiment, the relative permeability modifier may be provided by appropriate reaction in situ.

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What is claimed is: 1. A method for treating a subterranean formation penetrated by a well bore to reduce its permeability to aqueous-based fluids comprising: providing a permeability-modifying aqueous treatment fluid comprising a hydrophobically modified water-soluble polymer that has a molecular

What is claimed is: 1. A method for treating a subterranean formation penetrated by a well bore to reduce its permeability to aqueous-based fluids comprising: providing a permeability-modifying aqueous treatment fluid comprising a hydrophobically modified water-soluble polymer that has a molecular weight in the range of about 100,000 to about 10,000,000 once synthesized and comprises a polymer backbone and a hydrophobic branch, the polymer backbone comprising polar heteroatoms, the hydrophobic branch comprising an organic acid derivative selected from the group consisting of: an anhydride of octenyl succinic acid, an ester of octenyl succinic acid, an amide of octenyl succinic acid, an anhydride of dodecenyl succinic acid, an ester of dodecenyl succinic acid, and an amide of dodecenyl succinic acid; and injecting into the subterranean formation penetrated by a well bore said permeability-modifying aqueous treatment fluid, wherein the hydrophobically modified water-soluble polymer reduces the permeability of the subterranean formation to aqueous-based fluids. 2. The method of claim 1 wherein the permeability-modifying aqueous treatment fluid further comprises an aqueous-based fluid. 3. The method of claim 1 wherein the polar heteroatoms present within the polymer backbone of the hydrophobically modified water-soluble polymer comprise at least one heteroatom selected from the group consisting of: oxygen, nitrogen, sulfur, and phosphorous. 4. The method of claim 1 wherein the hydrophobically modified water-soluble polymer is present in the permeability-modifying aqueous treatment fluid in an amount in the range of about 0.02% to about 10% by weight of the permeability-modifying aqueous treatment fluid. 5. The method of claim 1 wherein the hydrophobically modified water-soluble polymer is a reaction product of a hydrophilic polymer that comprises a polymer backbone comprising polar heteroatoms and a hydrophobic compound. 6. The method of claim 5 wherein the hydrophilic polymer comprises at least one polymer selected from the group consisting of: a cellulose, a chitosan, a polyamide, a polyetheramine, a polyethyleneimine, a polyhydroxyetheramine, a polylysine, a polysulfone, and a starch. 7. The method of claim 6 wherein the at least one polymer comprises the starch, wherein the starch comprises a cationic starch. 8. The method of claim 1 wherein the permeability-modifying aqueous treatment fluid further comprises a gelling agent. 9. The method of claim 1 further comprising injecting a fracture stimulation fluid into the subterranean formation at a pressure sufficient to create or enhance at least one fracture therein after injection of the permeability-modifying aqueous treatment fluid into the formation. 10. The method of claim 1 further comprising injecting a fracture stimulation fluid into the subterranean formation at a pressure sufficient to create or enhance at least one fracture therein before injection of the permeability-modifying aqueous treatment fluid into the formation. 11. The method of claim 1 further comprising injecting a hydrocarbon liquid or a gas into the subterranean formation after injection of the permeability-modifying aqueous treatment fluid. 12. The method of claim 1 further comprising injecting a well treatment fluid comprising a mutual solvent into the subterranean formation prior to injection of the permeability-modifying aqueous treatment fluid. 13. A method for treating a subterranean formation penetrated by a well bore to reduce its permeability to aqueous-based fluids comprising: providing a permeability-modifying aqueous treatment fluid comprising: a hydrophilic polymer that comprises a polymer backbone comprising polar heteroatoms; a hydrophobic compound capable of reacting with the hydrophilic polymer, and a surfactant; and injecting into the subterranean formation penetrated by a well bore said permeability-modifying aqueous treatment fluid; wherein the hydrophilic polymer and the hydrophobic compound react in situ to form a hydrophobically modified water-soluble polymer that has a molecular weight in the range of about 100,000 to about 10,000,000 once synthesized, the hydrophobically modified water-soluble polymer comprising a polymer backbone and a hydrophobic branch, the polymer backbone comprising polar heteroatoms, the hydrophobic branch comprising an alkyl chain of about 4 to about 22 carbons without any intervening heteroatoms, the hydrophobic branch comprising an organic acid derivative selected from the group consisting of: an anhydride of octenyl succinic acid, an ester of octenyl succinic acid, an amide of octenyl succinic acid, an anhydride of dodecenyl succinic acid, an ester of dodecenyl succinic acid, and an amide of dodecenyl succinic acid; and wherein the hydrophobically modified water-soluble polymer reduces the permeability of the subterranean formation to aqueous-based fluids. 14. The method of claim 13 wherein the permeability-modifying aqueous treatment fluid further comprises an aqueous-based fluid. 15. The method of claim 13 wherein the hydrophilic polymer comprises a least one polymer selected from the group consisting of: a cellulose, a polyamide, a polyetheramine, a polyethyleneimine, a polyhydroxyetheramine, a polylysine, a polysulfone, and a starch. 16. The method of claim 13 wherein the polar heteroatoms present within the polymer backbone of the hydrophilic polymer comprise at least one heteroatom selected from the group consisting of: oxygen, nitrogen, sulfur, and phosphorous. 17. The method of claim 13 wherein the hydrophilic polymer is present in the permeability-modifying aqueous treatment fluid in an amount in the range of about 0.1% to about 10% by weight of the permeability-modifying aqueous treatment fluid. 18. The method of claim 13 wherein the hydrophobic compound has an alkyl chain length of about 4 to about 22 carbons. 19. The method of claim 13 wherein the hydrophobic compound is present in the permeability-modifying aqueous treatment fluid in an amount in the range of about 0.01% to about 5% by weight of the permeability-modifying aqueous treatment fluid. 20. The method of claim 13 wherein the surfactant comprises at least one surfactant selected from the group consisting of: an anionic surfactant, a cationic surfactant, an amphoteric surfactant, and a neutral surfactant. 21. The method of claim 13 wherein the surfactant is present in the permeability-modifying aqueous treatment fluid in an amount in the range of about 0.1% to about 2.0% by weight of the permeability-modifying aqueous treatment fluid. 22. The method of claim 13 wherein the permeability-modifying aqueous treatment fluid further comprises a gelling agent. 23. The method of claim 13 wherein the permeability-modifying aqueous treatment fluid further comprises a pH-adjusting agent that adjusts the pH to at least about 8. 24. The method of claim 23 wherein the pH-adjusting agent comprises at least one pH-adjusting agent selected from the group consisting of: a buffer, an alkali metal hydroxide, an alkali metal carbonate, and an alkali metal phosphate. 25. The method of claim 13 further comprising shutting the well bore for a period of about 1 minute to about 24 hours. 26. The method of claim 13 further comprising injecting a fracture stimulation fluid into the subterranean formation at a pressure sufficient to create or enhance at least one fracture therein after injection of the permeability-modifying aqueous treatment fluid into the formation. 27. The method of claim 13 further comprising injecting a fracture stimulation fluid into the subterranean formation at a pressure sufficient to create or enhance at least one fracture therein before injection of the permeability-modifying aqueous treatment fluid into the formation. 28. The method of claim 1 wherein the polar heteroatoms present within the polymer backbone of the hydrophobically modified water-soluble polymer comprise at least one heteroatom selected from the group consisting of: oxygen, sulfur, and phosphorous. 29. The method of claim 13 wherein the polar heteroatoms present within the polymer backbone of the hydrophobically modified water-soluble polymer comprise at least one heteroatom selected from the group consisting of: oxygen, sulfur, and phosphorous. 30. A method for treating a subterranean formation comprising: injecting into a subterranean formation penetrated by a well bore at least an aqueous treatment fluid, wherein the aqueous treatment fluid comprises a hydrophobically modified water-soluble polymer that has a molecular weight in the range of about 100,000 to about 10,000,000 once synthesized and comprises a polymer backbone and a hydrophobic branch, wherein the polymer backbone comprises at least one polar heteroatom selected from the group consisting of oxygen, sulfur, and phosphorous, wherein the hydrophobic branch comprises an organic acid derivative selected from the group consisting of: an anhydride or octenyl succinic acid, an ester of octenyl succinic acid, an amide of octenyl succinic acid, an anhydride of dodecenyl succinic acid, an ester of dodecenyl succinic acid, and an amide of dodecenyl succinic acid, and wherein the hydrophobically modified water-soluble polymer reduces the permeability of the subterranean formation to aqueous-based fluids. 31. The method of claim 30 wherein the hydrophobically modified water-soluble polymer is a reaction product of a hydrophilic polymer that comprises a polymer backbone comprising polar heteroatoms and a hydrophobic compound. 32. The method of claim 31 wherein the hydrophilic polymer comprises at least one polymer selected from the group consisting of: a cellulose, a polyetheramine, a polyhydroxyetheramine, a polysulfone, and a starch. 33. The method of claim 32 wherein the hydrophilic polymer comprises the starch, wherein the starch comprises a cationic starch.