Institute of Petroleum Engineering

Centre for Gas Hydrate Research Publications

Abstract 173.

A New Thermodynamic Scale Equation for Modelling of Asphaltene Precipitation Form Live Oil

Soltani Soulgani, B., Jamialahmadi, M., Rashtchian, D., and Tohidi, B.
Proceedings of the Canadian International Petroleum Conference (CIPC), Calgary, Alberta, Canada, 16-18 June 2009 (2009).

Accurate modeling of the asphaltenes precipitation from asphaltenic crude oil is essential in order to possible preventive and curative measures for the potential problem of asphaltene deposition occurring during oil production, transport and refining operations. Available thermodynamics model are very complicated and requires several different adjustable parameters for modeling asphaltene precipitation that may not be accurate in prediction of some operational range. In this paper the simple method base on scale equation has been developed for prediction of asphaltene precipitation modeling from live oil. Extensive experimental results were applied over a wide range of temperature and pressure on the different Iranian oil fields. The original scale equation has been presented for modeling of asphaltene precipitation due to increasing the normal alkane concentration to the dead oil. In the live oil the same analogy has been applied with this difference that for the live oil in the isothermal condition, change in the pressure is the major factor that causes the asphaltene precipitation. Therefore, two different models have been presented for upper and lower bubble point to cover all range of operational condition. The models are adequate to represent a wide range of the experimental results. The predictions of the suggested modified scaling equations for asphaltene deposition from live oil are compared with present results and the data which are reported by other investigators for live oil from other reservoirs. Good agreements are observed which confirm the suitability of the models.

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