초록 ▼

The present invention provides microemulsion surfactant additives for use in aqueous well treating fluids to prevent the formation of stable emulsions and sludge when the aqueous treating fluids contact hydrocarbons. The additives are basically comprised of a solvent, a co-solvent, water, an aqueous

The present invention provides microemulsion surfactant additives for use in aqueous well treating fluids to prevent the formation of stable emulsions and sludge when the aqueous treating fluids contact hydrocarbons. The additives are basically comprised of a solvent, a co-solvent, water, an aqueous liquid-hydrocarbon liquid de-emulsifying surfactant and a liquid hydrocarbon antisludging surfactant. Aqueous compositions including the additives and methods of treating subterranean formations or zones containing hydrocarbons using the compositions are also provided.

대표청구항 ▼

[ What is claimed is:] [10.] A microemulsion surfactant additive for use in aqueous well treating fluids to prevent the formation of stable emulsions and sludge when the aqueous treating fluids contact hydrocarbons comprising:a solvent comprised of hexylene glycol present in an amount in the range o

[ What is claimed is:] [10.] A microemulsion surfactant additive for use in aqueous well treating fluids to prevent the formation of stable emulsions and sludge when the aqueous treating fluids contact hydrocarbons comprising:a solvent comprised of hexylene glycol present in an amount in the range of from about 20% to about 30% by weight of said additive;a co-solvent comprised of isopropyl alcohol present in an amount in the range of from about 15% to about 30% by weight of said additive;water present in an amount in the range of from about 1% to about 10% by weight of said additive;an aqueous liquid-hydrocarbon liquid de-emulsifying surfactant comprised of tetraisopropyldiphenyloxide sulfonic acid present in an amount in the range of from about 40% to about 60% by weight of said additive; anda liquid hydrocarbon antisludging surfactant comprised of dodecylbenzene sulfonic acid present in an amount in the range of from about 1% to about 20% by weight of said additive. [19.] An improved method of treating a subterranean formation or zone containing hydrocarbons with an aqueous treating fluid comprising the steps of:combining a microemulsion surfactant additive for preventing the formation of stable emulsion and sludge when said aqueous treating fluid contacts hydrocarbons in said formation with said aqueous treating fluid in an amount in the range of from about 0.1% to about 1.0% by volume of the resulting treating fluid, said additive comprising a solvent selected from the group consisting of hexylene glycol, other glycols having in the range of from 1 to about 10 carbon atoms and glycol ethers having in the range of from 1 to about 10 carbon atoms, a co-solvent selected from the group consisting of isopropyl alcohol, other branched alkyl alcohols having in the range of from 1 to about 10 carbon atoms and linear alkyl alcohols having in the range of from 1 to about 10 carbon atoms, water, an aqueous liquid-hydrocarbon liquid de-emulsifying surfactant comprised of an alkyldiphenyloxide sulfonic acid, and a liquid hydrocarbon antisludging surfactant selected from the group consisting of alkylbenzene and alkylnaphthalene sulfonic acids and salts; andintroducing said treating fluid into said subterranean formation or zone.