Surfactant oil recovery process usable in high temperature forma

Details Surfactant oil recovery process usable in high temperature forma Surfactant oil recovery process usable in high temperature forma

1975-03-14

1976-02-24

Novosad, Stephen J.

Wells

Processes

Distinct, separate injection and producing wells

166273, 166275, E21B 4322

Patent

active

039399117

ABSTRACT:
A three surfactant system usable in high temperature petroleum formations containing water having from about 200 to about 14,000 parts per million polyvalent ions such as calcium and/or magnesium dissolved therein and a pH of from 5 to 9, and a method of using said surfactant system for recovering petroleum from high temperature subterranean petroleum-containing formations. The three component surfactant system comprises (1) water-soluble salt of an alkyl or alkylaryl sulfonate wherein the alkyl chain may have from 5 to 25 carbon atoms, (2) a phosphate ester surfactant with an average molecular weight not to exceed 1000, and (3) a surfactant having the following betaine-related structure: ##EQU1## wherein R is an alkyl group having from 12 to 24 carbon atoms, and n is an integer from one to five. The surfactant combination is stable up to at least 225.degree.F and resistant to bacterial attack and inhibits scale formation.

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patent: 3488289 (1970-01-01), Tate
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patent: 3532166 (1970-10-01), Williams
patent: 3648773 (1972-03-01), Gogarty
patent: 3724544 (1973-04-01), Tate
patent: 3817331 (1974-06-01), Jones

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