Patent ID: 8785355
Filing Date: 2014-07-22
Classification: B01F,B01J,C07C,C09K

Abstract:
1. An aqueous wellbore fluid comprising an anionic viscoelastic surfactant of formula I: in which: R is a saturated or unsaturated, linear or branched aliphatic hydrocarbon chain comprising from 15 to 22 carbon atoms, including mixtures thereof and/or optionally incorporating an aryl group; X is —(C═O)N(R R when X is —N(R R B m is an integer of from 1 to 4; in the form of monomeric unit, a dimer or oligomer; the amount of the anionic viscoelastic surfactant which is present in the wellbore fluid being sufficient that the fluid is an aqueous viscoelastic gel.