Oil recovery method

Details Oil recovery method Oil recovery method

1978-10-10

1980-03-25

Novosad, Stephen J.

Wells

Processes

Distinct, separate injection and producing wells

E21B 4322

Patent

active

041945646

ABSTRACT:
Oil is recovered from an underground petroleum reservoir which contains a brine having a salinity of from 50 to 220 kg/m.sup.3 total dissolved solids by injecting an alkylarylpolyalkoxyalkylene sulfonte surfactant that exhibits phase stability in the brine or diluted brine. The surfactant is injected in an aqueous solution which is prepared with diluted brine which has a salinity slightly less than that required to cause partitioning of the surfactant out of the aqueous phase and to the oil-water interface or oil phase. The injection of surfactant is followed by the injection of a driving slug comprised of either diluted brine or thickened diluted brine.

REFERENCES:
patent: 3977471 (1976-08-01), Gale et al.
patent: 4059154 (1977-11-01), Braden, Jr. et al.
patent: 4077471 (1978-03-01), Shupe et al.
patent: 4088189 (1978-05-01), Shupe

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