Technical Paper: Simulating the Permeability Reduction due to Asphaltene Deposition in Porous Media

Society: IPTC
Paper Number: 13262
Presentation Date: 2009


A new algorithm for static asphaltene modeling uses a multisolid thermodynamics approach in which the equality of fugacity for each component and phase is applied at equilibrium conditions to minimize the Gibbs free energy. The fractal distribution function used for the splitting and characterization of heavy components provides accurate results.

This paper documents the investigation of precipitation and redissolution of asphaltenes for a relatively heavy crude oil from an Iranian field. A 3D asphaltene model developed from a dynamic reservoir simulator simulates the precipitation, flocculation, and deposition and the impact on permeability in a slim tube. This approach defines the asphaltene as a set of components that can precipitate depending on their molar percentage weight in solution. The simulated permeability reduction resulting from deposition shows good agreement with the experimental data.

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