Mixed surfactant systems for enhanced oil recovery
The results of an evaluation of mixed surfactant systems for enhanced oil recovery are described. Several surfactant combinations have been studied. These include alkyl aryl sulfonates as primary surfactants and carboxymethylated ethoxylated (CME) surfactants and ethoxylated sulfonates (ES) as secondary surfactants. The ethoxylated surfactants increase the salinity tolerance of the primary surfactants and, in theory, allow tailoring of the surfactant system to match selected reservoir conditions. The experiments conducted included interfacial tension (IFT) measurements, phase behavior measurements, adsorption and/or chromatographic separation of mixed surfactant systems, measurements of solution properties such as the critical micelle concentration (CMC) of surfactant mixtures, and crude oil displacement experiments. The effects of temperature, surfactant concentration, salinity, presence of divalent ions, hydrocarbon type, and component proportions in the mixed surfactant combinations, and injection strategies on the performance potential of the targeted surfactant/hydrocarbon systems were studied. 40 refs., 37 figs., 8 tabs.
- Research Organization:
- National Inst. for Petroleum and Energy Research, Bartlesville, OK (USA)
- Sponsoring Organization:
- DOE/FE
- DOE Contract Number:
- FC22-83FE60149
- OSTI ID:
- 6423639
- Report Number(s):
- NIPER-497; ON: DE91002211
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
020300* -- Petroleum-- Drilling & Production
ADSORPTION
DISPERSIONS
ENTHALPY
FLUID INJECTION
INTERFACES
MICROEMULSION FLOODING
MISCIBLE-PHASE DISPLACEMENT
MIXTURES
PHASE STUDIES
PHYSICAL PROPERTIES
ROCKS
SALINITY
SANDSTONES
SEDIMENTARY ROCKS
SORPTION
SORPTIVE PROPERTIES
SURFACE PROPERTIES
SURFACE TENSION
SURFACTANTS
TEMPERATURE EFFECTS
TEMPERATURE MEASUREMENT
THERMODYNAMIC PROPERTIES