Use of highly saline ethoxylated surfactant system for oil recovery
Patent
·
OSTI ID:7301207
An aqueous solution of a sulfated polyoxylated primary alcohol and a soluble inorganic electrolyte was used for enhanced oil recovery. The electrolyte should be present in a concentration exceeding the critical concentration for forming a two-phase coacervate system, by an amount sufficient to convert the two-phase system to a turbid dispersion. The dispersion permits an interfacial tension with petroleum of 10/sup -4/ dynes/cm. A berea core (400 md) was flooded to residual oil saturation before flooding with a 4 M sodium chloride brine which contained Tergitol 15-S4 (4 ethylene oxide units, sodium salt). A 1 PV slug of the surfactant solution left only about 7 percent PV of oil.
- Assignee:
- Shell Oil Co.
- Patent Number(s):
- US 3500923
- OSTI ID:
- 7301207
- Country of Publication:
- United States
- Language:
- English
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