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Methods of reducing the permeability of a subterranean formation to aqueous-based fluids using a water-soluble relative permeability modifier that comprises a hydrophobically modified polymer, wherein the hydrophobically modified polymer is a reaction product of: a hydrophilic polymer that comprises

Methods of reducing the permeability of a subterranean formation to aqueous-based fluids using a water-soluble relative permeability modifier that comprises a hydrophobically modified polymer, wherein the hydrophobically modified polymer is a reaction product of: a hydrophilic polymer that comprises a polymer selected from the group consisting of a polyvinylamine, a poly(vinylamine/vinyl alcohol), and an alkyl acrylate polymer; and, a hydrophobic compound comprising at least one alkyl chain having a carbon chain length between about 4 and about 22 carbons. The water-soluble relative permeability modifier may be placed within a subterranean drilling operation such that the water-soluble relative permeability modifier attaches onto surfaces within the subterranean formation to effect permeability of aqueous fluids.

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1. A method for producing a foundry mold comprising the steps of: providing sand, water, and a binder wherein the binder comprises a smectite clay;providing a modifier comprising at least one metal carbonate selected from the group consisting of: calcium magnesium carbonate boron carbonate, and lead

1. A method for producing a foundry mold comprising the steps of: providing sand, water, and a binder wherein the binder comprises a smectite clay;providing a modifier comprising at least one metal carbonate selected from the group consisting of: calcium magnesium carbonate boron carbonate, and lead carbonate;forming a foundry mold composition by mixing the sand, the water, the modifier, and the binder;introducing the foundry mold composition into a pattern defining a foundry mold;consolidating the foundry mold composition within the pattern to form the foundry mold; and,removing the foundry mold from the pattern. 2. The method of claim 1 wherein the binder is present in the foundry mold composition in an amount greater than or equal to about 1% and less than or equal to about 15% by weight of the foundry mold composition. 3. The method of claim 1 wherein the modifier is present in the foundry mold composition in an amount greater than or equal to about 0.1% and less than or equal to about 20% by weight of the foundry mold composition. 4. The method of claim 1 wherein the modifier is present in the foundry mold composition in an amount greater than or equal to about 0.5% and less than or equal to about 5% by weight of the foundry mold composition. 5. The method of claim 1 wherein the sand comprises at least one material selected from the group consisting of: silica sand, olivine sand, chromite sand, zircon sand, carbon sand, ceramic sand, and a combination thereof. 6. The method of claim 1 wherein the sand is present in the foundry mold composition in an amount greater than or equal to about 40% and less than or equal to about 99% by weight of the foundry mold composition. 7. The method of claim 1 further comprising: introducing molten metal into the foundry mold; and,allowing the molten metal to solidify to form a metal casting. 8. The method of claim 1 wherein the foundry mold comprises at least one mold selected from the group consisting of: a cope, a drag, a core, and a derivative thereof. 9. A method for producing a foundry mold comprising the steps of: providing sand, water, and a binder wherein the binder comprises a smectite clay;providing modifier comprising at least one metal carbonate selected from the group consisting of: boron, and lead;forming a foundry mold composition by mixing the sand, the water, the modifier, and the binder;introducing the foundry mold composition into a pattern defining a foundry mold;consolidating the foundry mold composition within the pattern to form the foundry mold; and,removing the foundry mold from the pattern. 10. The method of claim 9 wherein the binder is present in the foundry mold composition in an amount greater than or equal to about 1% and less than or equal to about 15% by weight of the foundry mold composition. 11. The method of claim 9 wherein the modifier is present in the foundry mold composition in an amount greater than or equal to about 0.1% and less than or equal to about 20% by weight of the foundry mold composition. 12. The method of claim 9 wherein the modifier is present in the foundry mold composition in an amount greater than or equal to about 0.5% and less than or equal to about 5% by weight of the foundry mold composition. 13. The method of claim 9 wherein the sand comprises at least one material selected from the group consisting of: silica sand, olivine sand, chromite sand, zircon sand, carbon sand, ceramic sand, and a combination thereof. 14. The method of claim 9 wherein the sand is present in the foundry mold composition in an amount greater than or equal to about 40% and less than or equal to about 99% by weight of the foundry mold composition. 15. The method of claim 9 wherein comprising: introducing molten metal into the foundry mold; and,allowing the molten metal to solidify to form a metal casting. 16. A method for producing a foundry mold comprising the steps of: providing sand, water, and a binder wherein the binder comprises a smectite clay;providing a modifier comprising calcium magnesium carbonate;forming a foundry mold composition by mixing the sand, the water, the modifier, and the binder; wherein the binder is present in the foundry mold composition in an amount greater than or equal to about 1% and less than or equal to about 15% by weight of the foundry mold composition;wherein the modifier is present in the foundry mold composition in an amount greater than or equal to about 0.5% and less than or equal to about 5% by weight of the foundry mold composition; and,wherein the sand is present in the foundry mold composition in an amount greater than or equal to about 40% and less than or equal to about 99% by weight of the foundry mold composition;introducing the foundry mold composition into a pattern defining a foundry mold;consolidating the foundry mold composition within the pattern to form the foundry mold; and,removing the foundry mold from the pattern.