Oil recovery by microemulsion injection

Details Oil recovery by microemulsion injection Oil recovery by microemulsion injection

1975-04-30

1977-02-22

Purser, Ernest R.

Wells

Processes

Distinct, separate injection and producing wells

252 855D, E21B 4322

Patent

active

040087697

ABSTRACT:
A process for the recovery of oil from a subterranean oil reservoir involving the injection of a microemulsion comprising neutralized organic acids extracted from a petroleum oil, oil, and a co-surfactant having mutual solubility for oil and water. The microemulsion may be injected in two portions with the terminal portion having lower concentrations of oil and co-surfactant than the initial portion. The neutralized organic acids employed in the microemulsion may be produced by the alkaline extraction of a petroleum oil. The microemulsion may also contain an alkyl aryl sulfonate, an alkaline agent, and a monovalent salt.

REFERENCES:
patent: 3298436 (1967-01-01), McCardell
patent: 3302711 (1967-02-01), Dilgren
patent: 3330344 (1967-07-01), Reisberg
patent: 3330347 (1967-07-01), Brown et al.
patent: 3506070 (1970-04-01), Jones
patent: 3536136 (1970-10-01), Jones
patent: 3874453 (1975-04-01), Friedman
patent: 3929190 (1975-12-01), Chang et al.

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