Tertiary oil recovery
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United States of America Patent
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Mar 5, 1985
Issued Date -
N/A
app pub date -
Feb 4, 1983
filing date -
Jun 1, 1981
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An improved method for the recovery of tertiary oil from oil formations containing connate waters having a high brine concentration. A stable alcohol external microemulsion is formed from specific brine-soluble surfactants and alcohols for employment as a chemical slug. Such a microemulsion may be used to efficiently and effectively recover tertiary oil from formations in high brine concentrations. Specific examples of surfactants which may be employed to form the microemulsions of the present invention include amphoteric surfactants such as bis-2-hydroxyethylcocoamine propane sulfonate and bis-2-hydroxyethyloctadecyl amine propane sulfonate.
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