Secondary recovery method using non-ionic surfactant mixtures
A water-soluble nonionic aryl surfactant and a relatively water-insoluble, oil-soluble nonionic aryl surfactant dissolved in brine solution containing about 1M sodium chloride or calcium chloride was used for enhanced oil recovery. The water-soluble surfactant, Triton-X-100, was an octylphenol-ethylene oxide reaction product with an average of 10 ethylene oxide units. Triton X-45, the oil-soluble surfactant, was an octyl phenol-ethylene oxide reaction product with 5 ethylene oxide units. Sand packs (3.5 darcies) which contained a typical reservoir crude at waterflood oil residual concentration were flooded with the surfactants in brine. Only 1.5 PV slug produced almost all of the residual oil, leaving about 2 percent PV. Other surfactant systems which will tolerate a sodium chloride or calcium chloride brine were listed.
- Assignee:
- Shell Oil Co.
- Patent Number(s):
- US 3455386
- OSTI ID:
- 7299573
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
020300* -- Petroleum-- Drilling & Production
ALKALI METAL COMPOUNDS
ALKALINE EARTH METAL COMPOUNDS
CALCIUM CHLORIDES
CALCIUM COMPOUNDS
CALCIUM HALIDES
CHLORIDES
CHLORINE COMPOUNDS
ENERGY SOURCES
ENHANCED RECOVERY
FLUID INJECTION
FOSSIL FUELS
FUELS
HALIDES
HALOGEN COMPOUNDS
OIL WELLS
PETROLEUM
SAND
SODIUM CHLORIDES
SODIUM COMPOUNDS
SURFACTANTS
WATERFLOODING
WELLS