Journal
PETROLEUM SCIENCE AND TECHNOLOGY
Volume 37, Issue 4, Pages 402-408Publisher
TAYLOR & FRANCIS INC
DOI: 10.1080/10916466.2018.1550497
Keywords
acidic heavy oil; emulsifying viscosity reduction; high resolution mass spectrometer; interfacial tension measurement; salinity and pH
Funding
- State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University
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In this research, sodium dodecyl sulfonate (SDS) was selected as emulsifying viscosity reducer through a great number of laboratory experiments and then the effects of salinity and pH on viscosity reduction effects were evaluated. The result showed that higher salinity would result in emulsion viscosity enhancement. Compared with neutral pH conditions (pH =7), both acidic and basic conditions would promote emulsion viscosity reduction. When pH >7, generated O/W emulsions were much more stable than all other emulsions. Detailed compositional characterization of petroleum acid through a high resolution mass spectrometer (FT-ICR MS) proved that carboxylic acid and phenols inside petroleum acid would react with OH- at basic conditions and produce some natural surfactants. Theses natural surfactants could work synergistically with SDS and further improve emulsion stability.
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