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چکیده
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The deposition of asphaltene structures presents many challenges during the processes of production, transportation and refining of crude oil. To understand the mechanism of asphaltene aggregation and also to investigate the effect of nanoparticles on the formation of asphaltene structures in the early stages of asphaltene aggregation formation at the nanometer scale, better control of these structures can be helpful. In this study, kinetic modelling of deposition formation of asphaltene structures was performed using Dynamic Light Scattering (DLS) method without the presence of nanoparticles at 6.25, 12.5 and 25 mg/lit concentrations of synthetic petroleum solution (asphaltene toluene). By using kinetic modelling, the asphaltene particle aggregation number was obtained 9, 2 and 2 for concentrations of 6.25, 12.5 and 25 mg /lit, respectively. Also, the rate of reaction formation and disintegration of asphaltene aggregates was calculated for above-mentioned concentrations. Thus, the results show that the reaction was reversible. In the last stage, the interaction effect of SiO2 nanoparticles in nanofluid solution with a concentration of 25 mg/lit on the formation of asphaltene nanostructures was analyzed at 6.25, 12.5, 25 and 50 mg /lit concentrations of the synthetic oil solutions. Results show that at concentrations of 6.25 and 12.5 mg /lit of synthetic oil solution, the addition of SiO2 nanoparticles exacerbates the phenomenon of asphaltene particle aggregation. But at concentrations of 25 and 50 mg /lit, nanoparticles by adsorption of asphaltene particles on their surface play a stabilizing or inhibiting role to prevent the flocculation and deposition of asphaltene polar molecules.
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