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Journal of Porous Media
Facteur d'impact: 1.061 Facteur d'impact sur 5 ans: 1.151 SJR: 0.504 SNIP: 0.671 CiteScore™: 1.58

ISSN Imprimer: 1091-028X
ISSN En ligne: 1934-0508

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Journal of Porous Media

DOI: 10.1615/JPorMedia.v21.i6.10
pages 483-497

THE SIMULATION OF VISCOUS FINGERING BY USING A DIFFUSION-LIMITED-AGGREGATION MODEL DURING CO2 FLOODING

Wei Tian
Department of Modern Mechanics, University of Science and Technology of China, Hefei 230027, Anhui, China
Peichao Li
Shanghai University of Engineering Science
Yaoge Liu
Department of Modern Mechanics, University of Science and Technology of China, Hefei 230027, Anhui, China
Zhiwei Lu
McDougall School of Petroleum Engineering, University of Tulsa, Tulsa, OK
Detang Lu
Department of Modern Mechanics, University of Science and Technology of China, Hefei 230027, P. R. China

RÉSUMÉ

Under the conditions of high temperature and high pressure, viscous fingering phenomenon occurs during CO2 flooding because of viscosity differences between CO2 and crude oil, which leads to premature breakthrough of displacement fluid and the decrease of sweep efficiency. Therefore, oil production cannot reach the expected yields. In this paper, we investigate the effect of viscosity ratio, injection rate, and pore structure on viscous fingering in 3D digital cores obtained by CT experiments based on a diffusion-limited-aggregation (DLA) model. The results show that viscosity difference is the dominating factor that influences viscous fingering. With the increase of viscosity difference between the two displacement fluids, sweep efficiency decreases dramatically. In a lower permeable reservoir and at an appropriate injection rate, the viscous fingering can be decreased. The numerical simulation is validated against the CO2 flooding experiment.


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