Oil recovery by surfactant waterflooding

Details Oil recovery by surfactant waterflooding Oil recovery by surfactant waterflooding

1975-11-11

1977-02-01

Novosad, Stephen J.

Wells

Processes

Distinct, separate injection and producing wells

E21B 4322

Patent

active

040057496

ABSTRACT:
A surfactant waterflooding process for the recovery of oil from subterranean oil reservoirs in which a water-soluble polyalkylene oxide is employed as a sacrificial agent in order to retard adsorption of the surfactant. An aqueous pretreatment slug is injected which contains a water-soluble polyalkylene oxide sacrificial agent having a molecular weight of at least 1200. Thereafter an aqueous slug containing a surfactant exhibiting a lower molecular weight than that of the polyalkylene oxide sacrificial agent is injected. The surfactant slug may also contain a polyalkylene oxide sacrificial agent as described above. In this case, concentration of sacrificial agent in the surfactant slug normally is lower than the concentration in the pretreatment slug.

REFERENCES:
patent: 3414053 (1968-12-01), Treiber et al.
patent: 3437141 (1969-04-01), Brandner et al.
patent: 3469630 (1969-09-01), Hurd et al.
patent: 3500921 (1970-03-01), Abrams et al.
patent: 3589444 (1971-06-01), Johnson et al.
patent: 3704990 (1972-12-01), Sarem et al.
patent: 3788399 (1974-01-01), Feuerbacher et al.
patent: 3844350 (1974-10-01), Knight et al.

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