Permeability reduction in subterranean reservoirs

Details Permeability reduction in subterranean reservoirs Permeability reduction in subterranean reservoirs

E - Fixed Constructions

21

B

166/16

E21B 43/22 (2006.01) C09K 8/512 (2006.01) C09K 8/588 (2006.01)

Patent

CA 1192484

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

415881

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