Abstract

Abstract This study formulates a model for estimating permeability impairment caused by asphaltene deposition. The model is based on a mass balance and is capable of predicting permeability reduction in either vertical or horizontal wells. The model accounts for both the effects of position in the reservoir and time. The model is formulated in integral form to allow for analytic solutions when symbolic formulation exists for the parameters affecting the deposition process. The modeling approache accounts implicitly for the effects of pressure, temperature, and fluid composition, by including the asphaltene radius distribution. Even though the mass-balance model is one-dimensional and is valid for only single-phase flow in porous media, it can be used to estimate the permeability reduction for both homogeneous and heterogeneous formations.

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