Patent ID: 8895483
Filing Date: 2014-11-25
Classification: C09K

Abstract:
1. A method for changing the water permeability of a subterranean formation of a well, the method comprising: a. providing a fluid comprising a liquid carrier with a salt, methanol and a viscoelastic surfactant, wherein methanol is present in an amount of 5% to 15% by weight and the salt is present in an amount of 1% to 3% by weight and the viscoelastic surfactant is a cationic surfactant present in an amount of 0.01% to 0.5% by weight; b. introducing the fluid into the well; and c. contacting the fluid and the subterranean formation wherein the action of the liquid carrier, methanol and the viscoelastic surfactant is able to change the water permeability of the subterranean formation.