Alkoxylated surfactant system for heavy oil reservoirs

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

1990-12-21

1992-03-03

Suchfield, George A.

Wells

Processes

Distinct, separate injection and producing wells

166273, 166274, 166275, 252 8554, E21B 4322

Patent

active

050924052

ABSTRACT:
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.degree. and a reservoir temperature above about 150.degree. 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.degree. 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.

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patent: 4120358 (1978-10-01), Kalfoglou
patent: 4194565 (1980-03-01), Kalfoglou
patent: 4269271 (1981-05-01), Shupe et al.
patent: 4457373 (1984-07-01), Balzer et al.
patent: 4507211 (1985-03-01), Naylor et al.
patent: 4582138 (1986-04-01), Balzer
patent: 4971707 (1990-11-01), Osterloh

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