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Prediction of the Asphaltene Precipitation Envelope Curve (APE) and the Amount of Precipitated Asphaltene from Crude Oil in Asphaltene Precipitation Region

Kohanpour, Sobhan | 2025

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 58186 (06)
  4. University: Sharif University of Technology
  5. Department: Aerospace Engineering
  6. Advisor(s): Jamshidi, Saeid; Taghikhani, Vahid
  7. Abstract:
  8. Asphaltene precipitation has become one of the common challenges in oil fields worldwide. The aim of this study was to develop simple, efficient, and accurate correlations for predicting the asphaltene precipitation envelope and the weight percentage of precipitated asphaltene from crude oil. To this end, symbolic regression was employed as an effective tool for modeling asphaltene precipitation behavior under data-scarce conditions. This method demonstrated accurate system behavior prediction due to its ability to derive simple and interpretable mathematical relations. In this study, upper and lower threshold equations for asphaltene precipitation were developed in the temperature range of 80 to 400 °F, which could accurately predict the curve slope and precipitation thresholds for the studied crude oils. The use of real experimental data and applying vertical shifts to the curves enhanced the models' accuracy and improved the overlap between predictions and actual data. For model calibration, only a single initial experimental data point is required, ensuring the reliability of predictions. A major advantage of these correlations is the elimination of the need for oil composition data, fluid critical properties, and other conventional parameters used in equation-of-state-based modeling. Moreover, individually fitting models to each curve and using coefficients as functions of physical parameters improved both the accuracy and generalizability of the modeling. The resulting equations not only correctly predicted the slope of the curves for the studied oils but also maintained a simple structure
  9. Keywords:
  10. Precipitation ; Asphaltene Precipitation ; Asphaltene Precipitation Percentage ; Asphaltene Precipitation Envelope Curve (APE)

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