Altering subterranean formation permeability

Details Altering subterranean formation permeability Altering subterranean formation permeability

E - Fixed Constructions

21

B

31/21

E21B 33/138 (2006.01) C09K 8/512 (2006.01)

Patent

CA 2009117

Abstract Of The Disclosure Methods and compositions for altering the water perme- ability of subterranean formations are provided. The compo- sitions are comprised of water, at least one polymer capable of being gelled when contacted with a crosslinking agent, at least one crosslinking agent comprised of polyvalent metal cation, and a cation reactivity retarding chelating agent which provides anion for chelating the polyvalent metal cation selected from substantially water soluble dicarboxy- lic acids, hydroxy carboxylic acids, ketocarboxylic acids and the corresponding salts thereof.

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