Method of improving formation permeability using chlorine...

Details Method of improving formation permeability using chlorine... Method of improving formation permeability using chlorine...

E - Fixed Constructions

21

B

E21B 43/28 (2006.01) C09K 8/72 (2006.01)

Patent

CA 2043009

Permeability of a subterranean formation is increased by injecting into the formation sufficient amount of chlorine dioxide solution to react with formation clays and silicates. The pH of the Clo2 solution is controlled between 0.01 and 3.2 using preferably a mineral acid and liquid Co2 blended with the aqueous Clo2 solution.

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