초록 ▼

A method for the enhanced recovery of oil comprises injecting into an oil-containing formation an aqueous surfactant system having at least (1) a blend containing an unmodified Kraft lignin, an oil-soluble amine and a water-soluble sulfonate, and (2) water; driving the surfactant system through the

A method for the enhanced recovery of oil comprises injecting into an oil-containing formation an aqueous surfactant system having at least (1) a blend containing an unmodified Kraft lignin, an oil-soluble amine and a water-soluble sulfonate, and (2) water; driving the surfactant system through the formation and producing the oil mobilized by the surfactant system. A surfactant composition useful for enhanced oil recovery methods is also provided having at least an unmodified Kraft lignin, an oil-soluble amine and a water-soluble sulfonate.

대표청구항 ▼

[ What is claimed is:] [1.] A method for the enhanced recovery of oil from a subterranean formation containing oil and having at least one production well and at least one injection well, the method comprising:injecting into the formation a surfactant system having at leasta surfactant blend having

[ What is claimed is:] [1.] A method for the enhanced recovery of oil from a subterranean formation containing oil and having at least one production well and at least one injection well, the method comprising:injecting into the formation a surfactant system having at leasta surfactant blend having at leastan unmodified Kraft lignin,an oil-soluble primary alkyl amine having from about 8 to about 22 carbon atoms, anda water-soluble anionic surfactant selected from the group consisting of petroleum sulfonates, alkylaryl sulfonates and combinations thereof,wherein the blend has from about 1% to about 20% by weight of the oil-soluble amine, from about 5% to about 70% by weight of the lignin, and from about 10% to about 99% by weight of the water-soluble anionic surfactant; andwater, wherein the equilibrated interfacial tension between the oil and the surfactant system is less than about 100 millidynes/cm and the surfactant system has a pH of at least 9;driving the surfactant system through the formation; andproducing the oil mobilized by the surfactant system through the production well. [8.] A surfactant composition useful for preparing a surfactant system by combining the surfactant composition and water, wherein the surfactant system is useful for the enhanced recovery of oil from a subterranean formation containing oil, the surfactant composition comprising:an oil-soluble primary alkyl amine having from about 8 to about 22 carbon atoms;an unmodified Kraft lignin; anda water-soluble anionic surfactant selected from the group consisting of petroleum sulfonates, alkylaryl sulfonates and combinations thereof,wherein the oil-soluble amine is present in an amount from about 1% to about 20% by weight, the lignin is present in an amount of from about 5% to about 70% by weight, and the anionic surfactant is present in an amount of from about 30% to about 99% by weight, each based on the total surfactant present, andwherein when the surfactant composition is added to water to form the surfactant system, the equilibrated interfacial tension between the oil and the surfactant system is less than about 100 millidynes/cm and the surfactant system has a pH of at least 9.