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Thermodynamic Modeling of Asphaltene Precipitation for One of Iranian Oil Reservoirs

Tavakkoli, Mohammad | 2009

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 39560 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Kharrat, Riyaz; Masihi, Mohsen
  7. Abstract:
  8. Thermodynamic modeling is a useful method for predicting of asphaltene precipitation due to various reasons, such as CO2 injection, mixing of different oils in oil storage and pressure changes. However, the application of solid model and thermodynamic micellization model, for prediction of asphaltene precipitation under gas injection condition, hasnot been improved. In this work, two computer codes which are based on two different asphaltene precipitation thermodynamic models, 1-Thermodynamic Micellization Model and 2- Solid Model, have been developed, and, used for predicting of asphaltene precipitation data reported in the literature as well as the experimental data obtained from high pressure high temperature asphaltene precipitation experiments performed on Sarvak reservoir crude, one of potentially problematic Iranian heavy oil reserves, under pressure depletion and CO2 injection conditions. The model parameters obtained from sensitivity analysis as well as chosen characterization methods, including different techniques for estimation of critical properties and acentricities of SCN's and pseudo components, were applied in the thermodynamic models. The developed computer code of solid model is able to predict the asphaltene precipitation data under both pressure depletion and gas/solvent injection conditions reasonably well. Especially, under gas injection condition, for the maximum value of asphaltene precipitation and for the trend of the curve after the peak point, good agreements were observed which could rarely be found in the available literature. In the thermodynamic micellization model, a characterization method, which is commonly used in the thermodynamic solid model, was applied. This new approach showed a significant improvement in the thermodynamic micellization model predictions under gas ingection condition. It has been observed that the thermodynamic micellization model, which is more complex than solid model, is able to predict the trend of the asphaltene precipitation curve for gas titration condition reasonably well. Also, its predictions matched well with more experimental data points in comparison to the solid model predictions.

  9. Keywords:
  10. Thermodynamic Modeling ; Pressure Drop ; Asphaltene Precipitation ; Carbon Dioxide Injection ; Solid Model ; Thermodynamic Micellization Model

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