Patent ID: 9255468
Filing Date: 2016-02-09
CPC Classification: C09K,E21B

Claim Text:
1. A method comprising: providing or preparing a complexing-acidizing treatment fluid having a pH of about 2 or less and comprising: placing the complexing-acidizing treatment fluid in a carbonate subterranean formation matrix penetrated by a well bore; allowing the acid in a first portion of the treatment fluid to generate metal cations by dissolution of a first portion of the subterranean formation matrix; reacting the aminopolycarboxylic acid chelating agent in the first portion of the treatment fluid with the metal cations so as to form at least a plurality of aggregate blocking agents in wormholes within the carbonate subterranean formation matrix; and allowing the plurality of aggregate blocking agents to divert a second portion of the complexing-acidizing treatment fluid to a main channel in a second portion of the carbonate subterranean formation matrix that is distinct from the wormholes.