Viscoelastic surfactants and methods of making and using same

摘要

A method of servicing a wellbore comprising placing downhole a composition comprising a surfactant package comprising a cationic surfactant and anionic surfactant, wherein the surfactant package when contacted with an aqueous solution forms a viscosified composition in the presence of less than about 30 wt. % of a hydrotrope.

主权项

1. A method of servicing a wellbore comprising:
placing within the wellbore a composition comprising a surfactant package the surfactant package comprising a cationic surfactant and a non-hydrotropic anionic surfactant, wherein the non-hydrotropic anionic surfactant is selected from the group consisting of sodium oleate, sodium dodecylbenzenesulfonate, sodium decanoate, sodium octyl sulfate, sodium caprylate, sodium stearate, sodium myristate, sodium laurate, sodium cetyl sulfate, sodium myristyl sulfate, sodium laurel sulfate, and sodium decyl sulfate, pumping the composition down to a lost circulation zone within the wellbore, contacting the composition with an aqueous solution in the lost circulation zone in the substantial absence of hydrotropes at an elevated temperature of from about 10° C. to about 200° C., wherein the substantial absence comprises a presence of less than about 0.1 wt. % of hydrotropes based on a total weight of the surfactant package, and forming a viscosified composition in the lost circulation zone that substantially seals the lost circulation zone.