Fluid system having controllable reversible viscosity
AssigneeSchlumberger Technology Corporation
InventorsFrank F Chang, Diankui Fu
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Abstract
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.
Claims10
A method of treating a subterranean hydrocarbons reservoir comprising contacting the formation with a treating fluid comprising an aqueous solution, an acid, methanol at a concentration of between 0.1 and 10% by volume, and a surfactant acting as gelling agent essentially consisting of erucylamidopropyl betaine or a protonated/deprotonated homolog or salt thereof.
A method of treating a subterranean hydrocarbons reservoir penetrated by a well, said well having a bottomhole static temperature ranging between about 25° C. and about 150° C., comprising contacting the formation with a treating fluid comprising an aqueous solution, about 15 to about 28% by weight of hydrochloric acid, about one volume percent of methanol, and about 3 weight percent of erucylamidopropyl betaine.
A method of treating a subterranean formation comprising contacting the formation with a mutual solvent and then, contacting the formation with a treating fluid comprising an aqueous solution, acid, methanol, and erucylamidopropyl betaine.
Dependencies are inferred from the claim text.