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• W2000599583 abstract "Abstract Recovery of viscous oil can be significantly improved by injecting polymer solutions. The processes leading to increased oil production occur on a large scale – improving vertical and areal sweep efficiency – but they begin on a micro scale. Micromodels with realistic pore geometries have been created. These micromodels were saturated with viscous oil and the displacement of the oil by water and polymer solutions investigated experimentally. Polymer injection reduced fingering compared with water injection and increased sweep efficiency accordingly. The micromodel pore network geometry was digitised using Scanning Electron Microscopy (SEM). The digitised model was used to perform Computational Fluid Dynamics Simulations (CFD) of the displacement processes. The displacement efficiencies and displacement patterns of the CFD simulations using water, polymer solutions, and polymer solutions after water breakthrough at the outlet end to displace oil were very similar to the results of the micromodel experiments. Then, the CFD simulations were used to investigate the displacement at the pore scale. Water injection leads to creation of fingers along slightly more permeable flowpaths. The number and length of the fingers decreases if polymer solution is injected. Even for polymer injection after water breakthrough, the fingering is reduced, polymer solutions are diverted into less favourable flow paths and sweep efficiency is increased. CFD simulations can also be used to look into nonNewtonian fluid behaviour at the pore scale. The polymers injected in the micromodel experiments exhibited shear-thinning behaviour. On a pore scale, CFD simulations showed that the shear stress and viscosity of the polymer solutions accordingly are significantly lower in the pore throats than in the pores. Hence, the displacement efficiency of the polymer solutions is impacted by the shear-thinning behaviour. The CFD simulations are in remarkable agreement with the micromodel experiments and can be used to quantify the displacement processes at pore scale." @default.
• W2000599583 created "2016-06-24" @default.
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• W2000599583 date "2012-04-14" @default.
• W2000599583 modified "2023-09-23" @default.
• W2000599583 title "Pore-Scale Evaluation of Polymers Displacing Viscous Oil – Computational Fluid Dynamics Simulation of Micromodel Experiments" @default.
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• W2000599583 doi "https://doi.org/10.2118/154169-ms" @default.
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