Patent ID: 7902124
Filing Date: 2011-03-08
Classification: C09K,C11D,C23F,Y10S

Abstract:
1. A method of scale removing or perforation cleaning applied to a subterranean formation penetrated by a wellbore of a well having iron-containing components, the method comprising: introducing a treatment fluid into the wellbore of the well, the treatment fluid comprising an aqueous solution, a mineral acid, a viscoelastic surfactant gelling agent and corrosion inhibitor system selected from the group consisting of an alkyl substituted aliphatic ketone, alkenyl substituted aliphatic ketone, alicyclic substituted aliphatic ketone, aromatic substituted aliphatic ketone, aliphatic aldehyde and aromatic aldehyde, the treatment fluid being substantially free of any formic acid or precursor of formic acid; contacting the treatment fluid with the iron-containing components; and removing scale or cleaning perforation with the treatment fluid.