Patent ID: 7237608
Filing Date: 2007-07-03
Classification: C09K,Y10S

Abstract:
1. A method of treating a subterranean formation penetrated by a wellbore comprising injecting into said formation a treatment fluid comprising at least one viscoelastic surfactant at a concentration of between about 0.1 and about 10 percent by weight, a viscoelastic surfactant concentration insufficient for aggregation of viscoelastic surfactant structures to form a viscoelastic fluid, wherein said treatment fluid further comprises a formation-dissolving agent selected from the group consisting of hydrochloric acid, formic acid, acetic acid, lactic acid, glycolic acid, sulfamic acid, malic acid, citric acid, tartaric acid, maleic acid, methylsulfamic acid, chloroacetic acid, aminopolycarboxylic acids, 3-hydroxypropionic acid, polyaminopolycarboxylic acids, salts thereof and mixtures of said acids and salts.