Speaker
Description
Accurate simulation of interfacial mass transfer during CO₂ displacement represents a fundamental challenge in modeling enhanced oil recovery (EOR) and carbon sequestration processes. This research presents an improved single-field numerical framework that integrates volume-of-fluid (VOF) methodology with Continuum Species Transfer (CST) method to capture complex pore scale interfacial phenomena. The presented approach introduces a coupled symmetric mass-transfer source term formulation alongside the phase interface, which was then added into the indicator equation, pressure equation and concentration equation. An additional species transfer term was introduced to effectively swell the disperse oil bubble and limit the effective interface movement to interface area, which would effectively improving the limitations of the application of the traditional method. A concentration-dependent viscosity model was introduced to consider the viscosity reduction mechanism during the gas transport process. The presented method is validated through one-dimensional simulation against analytical solutions for pure gas dissolution into a solvent system, and compared with the results of micro-scale PVT microfluidic experiments. CO₂ injection simulations in complex porous media reveal the interplay between fluid distribution patterns and mass transfer efficiency. The mechanisms of trapped oil mobilization and dissolved CO₂ storage were investigated. The trapped oil clusters were observed in pores with large aspect ratio during drainage process, which is consistent with the reported experimental results. The pore-scale effective diffusivity and mass exchange coefficient were calculated based on the saturation and concentration profiles. The result demonstrating that oil displacement is predominantly controlled by drainage, with significant flow diversion effect occurring after gas breakthrough. The developed computational methodology provides a robust framework for the investigation of capillary-dominated multiphase flow and transport phenomena, offering new insights into interfacial mass transfer mechanisms, CO₂-EOR processes and geological carbon storage applications.
| Country | China |
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