| Autor: |
Novosad, J., Maini, B., Batycky, J. |
| Zdroj: |
Journal of the American Oil Chemists' Society; October 1982, Vol. 59 Issue: 10 p833A-839A, 7p |
| Abstrakt: |
The main purpose of this work was to evaluate surfactant systems in terms of viscosities and retention levels in Berea sandstone and in terms of their oil displacement efficiencies. Commercially available surfactants can act as effective cosurfactants to petroleum sulfonates in high salinity and high hardness environments. Such systems can achieve the ultralow interfacial tensions required for effective tertiary oil recovery. The two cosurfactants producing effective systems distribute between the phases in such a way that one is between the upper and middle phases, and the other is between the middle and lower phases. The cosurfactant material increases the excess phase uptake into the microemulsion-rich phase which is opposite to the behavior of alcohols used in low salinity formulations. Tertiary oil in Berea sandstone is recoverable by such surfactant systems in high salinity and high hardness environments. The chromatographic separation of surfactant species has been observed. Retention levels are quite high and must be reduced substantially before these systems can be commercialized. |
| Databáze: |
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