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۱Application of a new association equation of state for prediction of asphaltenes and resins deposition
اطلاعات انتشار: ششمین کنگره بین المللی مهندسی شیمی، سال
تعداد صفحات: ۹
Asphaltene deposition is a severe problem which can cause fouling in the reservoir, in the well, in the pipeline and in the oil production and processing facilities. Association Equation of State (AEOS) is one of the most useful models that can be used to predict asphaltene phase behavior as well as asphaltene deposition conditions. For an AEOS, it is assumed that the total compressibility factor consists of physical and chemical parts. In this study, the conventional form of compressibility factor developed by Soave will be applied as physical compressibility factor. However, for chemical compressibility factor a new form will be proposed. The obtained total compressibility factor is then utilizedto calculate asphaltene and resin deposits. The calculated amounts of deposited asphaltenes by the proposed model together with experimental results are used to calculate resin deposit. Comparison with experimental results shows that the new proposed model can be used to predict the amounts of deposited resins and asphaltenes within an acceptable range of accuracy.<\div>

۲Modeling of co–precipitation of resin and asphaltene in crude oil by association equation of state
اطلاعات انتشار: ششمین کنگره بین المللی مهندسی شیمی، سال
تعداد صفحات: ۶
Resin content is an effective parameter which has adverse effect on precipitation of asphaltene in crude oil. Fluctuations in temperature, pressure or oil composition disturbs chemical equilibrium in reservoir which results in co–precipitation of resin and asphaltene. In this work co–precipitation of resin and asphaltene has been modeled using an association equation of state (AEOS) where asphaltene and resin are considered as associate components of oil. According to association fluid theory, total compressibility factor is assumed to be sum of physical and chemical compressibility factors. Liquid – liquid and liquid – vapor equilibrium calculations are accomplished with the assumption that asphaltene and resin do not contribute in vapor phase. The comparison of experimental asphaltene precipitation with the ones obtained from developed model, proves acceptability of the proposed model.<\div>
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