NOVEL FLUID SYSTEM HAVING CONTROLLABLE REVERSIBLE VISCOSITY

摘要

This Invention relates to methods of treating a subterranean hydrocarbons reservoir comprising contacting the formation with a treating fluid comprising an aqueous solution, an acid, a surfactant acting as gelling agent essentially consisting of erucylamidopropyl betaine or a protonated/deprotonated homolog or salt thereof. The treating fluid may further comprise a lower n-alcohol for improved temperature stability.