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A relative permeability modifier may be used to protect a hydrocarbon-producing zone of a subterranean formation without detrimentally affecting its ability to produce hydrocarbons. Methods for protecting a hydrocarbon-producing zone of a subterranean formation can comprise: introducing a first trea

A relative permeability modifier may be used to protect a hydrocarbon-producing zone of a subterranean formation without detrimentally affecting its ability to produce hydrocarbons. Methods for protecting a hydrocarbon-producing zone of a subterranean formation can comprise: introducing a first treatment fluid comprising a relative permeability modifier to a hydrocarbon-producing zone of a subterranean formation also comprising a water-producing zone; concurrently with or after introducing the first treatment fluid to the hydrocarbon-producing zone, introducing a second treatment fluid comprising a sealant composition to the water-producing zone; and allowing the relative permeability modifier to substantially prevent the sealant composition from entering the hydrocarbon-producing zone.

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1. A method comprising: introducing a first treatment fluid comprising a relative permeability modifier to a hydrocarbon-producing zone of a subterranean formation also comprising a water-producing zone; wherein the relative permeability modifier reduces production of water without substantially red

1. A method comprising: introducing a first treatment fluid comprising a relative permeability modifier to a hydrocarbon-producing zone of a subterranean formation also comprising a water-producing zone; wherein the relative permeability modifier reduces production of water without substantially reducing production of hydrocarbons from the hydrocarbon-producing zone;concurrently with or after introducing the first treatment fluid to the hydrocarbon-producing zone, introducing a second treatment fluid comprising a sealant composition to the water-producing zone; andallowing the relative permeability modifier to substantially prevent the sealant composition from entering the hydrocarbon-producing zone. 2. The method of claim 1, wherein the first treatment fluid is not allowed to contact the water-producing zone. 3. The method of claim 1, wherein the second treatment fluid is not allowed to contact the hydrocarbon-producing zone until the first treatment fluid has been introduced thereto. 4. The method of claim 1, wherein the subterranean formation lacks a natural subterranean barrier between the hydrocarbon-producing zone and the water-producing zone. 5. The method of claim 1, wherein the relative permeability modifier comprises a hydrophobically modified hydrophilic polymer. 6. The method of claim 1, wherein the sealant composition comprises an aqueous-based sealant. 7. The method of claim 1, wherein at least a portion of the first treatment fluid is introduced to the hydrocarbon-producing zone before the second treatment fluid is introduced to the water-producing zone. 8. The method of claim 1, further comprising: forming a fluid seal in the water-producing zone; andproducing a hydrocarbon fluid from the subterranean formation. 9. The method of claim 1, further comprising: placing a fluid barrier between the hydrocarbon-producing zone and the water-producing zone within a wellbore penetrating the hydrocarbon-producing zone and the water-producing zone. 10. A method comprising: providing a subterranean formation penetrated by a wellbore comprising a work string and an annulus disposed about the work string, the subterranean formation comprising a hydrocarbon-producing zone and a water-producing zone, the water-producing zone being located below the hydrocarbon-producing zone;introducing a first treatment fluid comprising a relative permeability modifier to the hydrocarbon-producing zone, the first treatment fluid being introduced via the annulus; wherein the relative permeability modifier reduces production of water without substantially reducing production of hydrocarbons from the hydrocarbon-producing zone;concurrently with or after introducing the first treatment fluid to the hydrocarbon producing zone, introducing a second treatment fluid comprising a sealant composition to the water-producing zone, the second treatment fluid being introduced via the work string; andproducing a hydrocarbon fluid from the subterranean formation. 11. The method of claim 10, wherein the subterranean formation lacks a natural subterranean barrier between the hydrocarbon-producing zone and the water-producing zone. 12. The method of claim 10, wherein the relative permeability modifier comprises a hydrophobically modified hydrophilic polymer. 13. The method of claim 10, wherein the sealant composition comprises an aqueous-based sealant. 14. The method of claim 10, further comprising: placing a fluid barrier within the annulus between the hydrocarbon-producing zone and the water-producing zone. 15. The method of claim 10, wherein at least a portion of the first treatment fluid is introduced to the hydrocarbon-producing zone before the second treatment fluid is introduced to the water-producing zone. 16. A method comprising: providing a subterranean formation penetrated by a wellbore comprising a work string and an annulus disposed about the work string, the subterranean formation comprising a hydrocarbon-producing zone and a water-producing zone, the water-producing zone being located above the hydrocarbon-producing zone;introducing a first treatment fluid comprising a relative permeability modifier to the hydrocarbon-producing zone, the first treatment fluid being introduced via the work string;concurrently with or after introducing the first treatment fluid to the hydrocarbon producing zone, introducing a second treatment fluid comprising a sealant composition to the water-producing zone, the second treatment fluid being introduced via the annulus; andproducing a hydrocarbon fluid from the subterranean formation. 17. The method of claim 16, wherein the subterranean formation lacks a natural subterranean barrier between the hydrocarbon-producing zone and the water-producing zone. 18. The method of claim 16, wherein the relative permeability modifier comprises a hydrophobically modified hydrophilic polymer. 19. The method of claim 16, wherein the sealant composition comprises an aqueous-based sealant. 20. The method of claim 16, further comprising: placing a fluid barrier within the annulus between the hydrocarbon-producing zone and the water-producing zone. 21. The method of claim 16, wherein at least a portion of the first treatment fluid is introduced to the hydrocarbon-producing zone before the second treatment fluid is introduced to the water-producing zone.