Influence of aggregation of asphaltenes on the rheological properties of oil |
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| Authors: | E V Mal’tseva A M Gorshkov L V Chekantseva L V Shishmina N V Yudina |
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| Institution: | 1. Institute of Petroleum Chemistry, Siberian Division, Russian Academy of Sciences, Tomsk, Russia
2. Institute of Natural Resources, National Research Tomsk Polytechnic University, Tomsk, Russia
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| Abstract: | Photon correlation spectroscopy was used to determine the threshold concentrations of n-heptane for phase transitions of asphaltenes in model systems for two types of oil. The rheological properties exhibited by high-paraffin oil in the asphaltene aggregation process were analyzed. It was shown that the presence of resin and paraffi n fractions in oil prevents phase transition of asphaltenes at the threshold concentration of n-heptane for the model system, so that a higher precipitant concentrations is required for aggregation of asphaltenes and formation of oil sludge. |
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