Patent ID: 8420576

Claim:
A method comprising: introducing a hydrophobically and cationically modified relative permeability modifier into a portion of a subterranean formation, wherein the hydrophobically and cationically modified relative permeability modifier comprises a reaction product of a hydrophilic polymer with a hydrophobically modified hydrophilic monomer and a cationic compound, wherein the hydrophobically modified hydrophilic monomer comprises an alkyl chain length of from about 4 to about 22 carbons selected from the group consisting of: an alkyl acrylate; an alkyl methacrylate; an alkyl acrylamide; an alkyl methacrylamide; an alkyl dimethylammoniumethyl methacrylate halide; and any combination thereof and, wherein the cationic compound comprises an alkyl chain length of from about 1 to 3 carbons selected from the group consisting of: an alkyl halide; a sulfone; a sulfate; an organic acid; an organic acid derivative, and a combination thereof; wherein the hydrophilic polymer is selected from the group consisting of: a polyacrylamide; a polyvinylamine; a poly(vinylamine/vinyl alcohol); an alkyl acrylate polymer; cellulose; chitosan; a polyamide; a polyetheramine; a polyethyleneimine; a polyhydroxyetheramine; a polylysine; a polysulfone; a gum; a starch; and a combination thereof.