Journal
PETROLEUM SCIENCE AND TECHNOLOGY
Volume 31, Issue 15, Pages 1544-1552Publisher
TAYLOR & FRANCIS INC
DOI: 10.1080/10916466.2010.547906
Keywords
cloud point; critical micelle concentration; enhanced oil recovery; nonionic surfactant; salinity
Funding
- Chemical Engineering Department, Federal University of Rio Grande do Norte, Brazil [ANP-PRH14]
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The cloud point phenomenon for solutions of polyoxyethylene (POE)-type nonionic surfactants (B, C, D, and E) in different salt concentrations was investigated. The cloud point temperature, T-c, increased with elongation of the POE chain. This demonstrated that the solvophilicity of the surfactants comes from POE chain. Thus, the cloud point decreased with increase of salt concentration. Surfactants D and E were the only ones that showed cloud point temperatures above the average temperature of oil wells (similar to 70 degrees C), even at high concentrations of salt, and surfactant E was most suitable for enhanced oil recovery operations.
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