CONTROLLED RELEASE OF SURFACTANTS FOR ENHANCED OIL RECOVERY

摘要

A sparingly soluble sulfonate-metal salt particle includes the metal ion salt of an alkyl aryl sulfonate, the metal ion salt of a petroleum sulfonate and a hydrophobically modified hydrophilic polymer, and has an average particle size diameter in a range of from about 50 nm to about 450 nm and is sparingly soluble in water at room temperature. A method of producing a sparingly soluble sulfonate-metal salt particle includes the steps of introducing an aqueous solution containing a metal ion salt into a reactor, introducing an aqueous solution containing a sulfonate surfactant and a polymer into the reactor, and operating the reactor such that the sparingly soluble sulfonate-metal salt particle forms from the interaction of the metal ion from the salt, the sulfonate surfactant and the polymer.

主权项

1. A sparingly soluble sulfonate-metal salt particle comprises a metal ion salt of an alkyl aryl sulfonate, a metal ion salt of a petroleum sulfonate and a hydrophobically modified hydrophilic polymer,where the sparingly soluble sulfonate-metal salt particle has an average particle size diameter in a range of from about 50 nm to about 450 nm, andwhere the sparingly soluble sulfonate-metal salt particle is sparingly soluble in water at room temperature.