Investigating the effect of interfacial tension and contact angle on capillary pressure curve, using free energy Lattice Boltzmann Method.pdfVIP

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Investigating the effect of interfacial tension and contact angle on capillary pressure curve, using free energy Lattice Boltzmann Method.pdf

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Investigating the effect of interfacial tension and contact angle on capillary pressure curve, using free energy Lattice Boltzmann Method.pdf

Journal of Natural Gas Science and Engineering 35 (2016) 1146e1157 Contents lists available at ScienceDirect Journal of Natural Gas Science and Engineering journal homepage: /locate/jngse Investigating the effect of interfacial tension and contact angle on capillary pressure curve, using free energy Lattice Boltzmann Method Javad Ansarinasab*, Mohammad Jamialahmadi Department of Petroleum Engineering, Petroleum University of Technology, Ahwaz, Iran article info Article history: Received 10 May 2016 Received in revised form 9 September 2016 Accepted 20 September 2016 Available online 21 September 2016 Keywords: Free energy model Lattice Boltzmann method Capillary pressure curve Interfacial tension Contact angle Porous media abstract Two phase ?ow of gas and oil through a porous medium was simulated by Free Energy model of Lattice Boltzmann Method. Constant pressure boundary condition for Free Energy model was derived and then, capillary pressure curve was determined for high density ratio ?ow (gas and oil ?ow) through porous media. A validation test was carried out to calculate pore size distribution from determined capillary pressure curve. Good agreement between this pore size distribution and real pore size distribution of porous medium was seen. Finally, the effect of interfacial tension and contact angle on shape of capillary pressure curve was investigated. Comparison of these results with experimental results of literature in this ?eld shows good consistency between trends of capillary pressure curves. The results con?rm that Free Energy lattice Boltzmann method is capable of determining acceptable capillary pressure curve for gas and oil ?ow in porous media which is supposedly the ?rst usage of Free Energy model for this objective. ? 2016 Elsevier B.V. All rights reserved. 1. Introduction Capillary pressure is de?ned as pressure difference between two immiscible ?uid phases which occupy the same pores. Pressure difference is generated by interfacial tension (