Permeability reduction in subterranean reservoirs

摘要: A method for selectively reducing the permeability of higher zones a subterranean reservoir having heterogeneous permeability, such reduction occurring substantial distance away from well in which there is injected into an aqueous solution or solutions water-soluble polymer, material capable under certain conditions at least partially cross-linking polymer to form gelatinous precipitate, and alkaline amount sufficient maintain pH polymer-containing composition above about 9 until has passed through reservoir.