Alkoxylated surfactant system for heavy oil reservoirs

Details Alkoxylated surfactant system for heavy oil reservoirs Alkoxylated surfactant system for heavy oil reservoirs

E - Fixed Constructions

21

B

E21B 43/22 (2006.01) B01F 17/42 (2006.01) C09K 8/584 (2006.01) C09K 8/592 (2006.01) E21B 43/24 (2006.01)

Patent

CA 2052006

ALKOXYLATED SURFACTANT SYSTEM FOR HEAVY OIL RESERVOIRS (D#79,033-F) ABSTRACT OF THE DISCLOSURE The invention is a method of recovering heavy oil from an underground reservoir by surfactant flooding which comprises injecting an aqueous surfactant solution comprising about 0.1% to about 5% by weight of an alkoxylated nonionic or ionic surfactant through an injection well into an underground reservoir containing a heavy oil having an average API gravity below about 20° and a reservoir temperature above about 150°F, where the alkoxylated surfactant must have sufficient alkylene oxide groups comprised of ethylene oxide or propylene oxide to have a cloud point above about 100°F and below reservoir temperature, and to be water-soluble in the surfactant solution to be injected at a temperature below its cloud point, and have a sufficiently large hydrophobe to be soluble in the reservoir's heavy oil at a temperature equal to or greater than reservoir temperature. 79033.app

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