Method for improving matrix acidizing in formations

Details Method for improving matrix acidizing in formations Method for improving matrix acidizing in formations

E - Fixed Constructions

21

B

E21B 43/27 (2006.01) C09K 8/62 (2006.01) C09K 8/72 (2006.01) C09K 8/74 (2006.01) E21B 43/14 (2006.01) E21B 43/26 (2006.01)

Patent

CA 2152393

A method for improved matrix acidizing in a subter- ranean formation comprises: a) injecting a pad of viscous fluid via a perforated wellbore (10) into at least one high permeabil- ity interval or zone (16) of the formation at a rate sufficient to cause a fracture therein to remain open; and b) injecting there- after a liquid acid into the formation at a rate sufficient to enter said interval (16) equally as the pad restrains the flow of acid in said interval or zone (16).

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