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Modelling of bypassed oil recovery in EOS compositional simulation Open Access


Other title
dual porosity flow
fluid characterization
bypassed oil
capacitance effect
Type of item
Degree grantor
University of Alberta
Author or creator
Zhang, Bo
Supervisor and department
Okuno, Ryosuke (Petroleum Engineering)
Examining committee member and department
Leung, Juliana (Petroleum Engineering)
Li, Huazhou (Petroleum Engineering)
Okuno, Ryosuke (Petroleum Engineering)
Department of Civil and Environmental Engineering
Petroleum Engineering
Date accepted
Graduation date
Master of Science
Degree level
The local equilibrium assumption in the conventional composition simulation allows for no bypassing of oil at the sub-grid scale. Oil bypassing by gas, however, always occurs due to micro and macroscopic heterogeneities, gravity, and front instability. This research presents an efficient two-step method to model bypassed oil recovery in multiphase compositional flow simulation of gas floods. The oil bypassing is first quantified by use of the dual-porosity flow with three dimensionless groups: the bypassed fraction, throughput ratio, and longitudinal Péclet number. To represent bypassed oil recovery in single-porosity flow, a new flow-based fluid characterization is applied to part of the heavy fractions of the fluid model used. Properties for pseudo components are determined based on the throughput ratio estimated in the dual-porosity flow. Case studies for various reservoir/fluid properties show that single-porosity flow with the new method successfully represents bypassed oil recovery observed in core-flooding experiments and fine-scale heterogeneous simulations.
Permission is hereby granted to the University of Alberta Libraries to reproduce single copies of this thesis and to lend or sell such copies for private, scholarly or scientific research purposes only. Where the thesis is converted to, or otherwise made available in digital form, the University of Alberta will advise potential users of the thesis of these terms. The author reserves all other publication and other rights in association with the copyright in the thesis and, except as herein before provided, neither the thesis nor any substantial portion thereof may be printed or otherwise reproduced in any material form whatsoever without the author's prior written permission.
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