Pore-scale Simulation of Water Alternate Gas Injection |
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Authors: | V Sander Suicmez Mohammad Piri Martin J Blunt |
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Institution: | (1) Department of Earth Science and Engineering, Imperial College London, London, SW7 2AZ, UK;(2) Department of Chemical and Petroleum Engineering, University of Wyoming, Laramie, Wyoming 82071, USA |
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Abstract: | We use a three-dimensional mixed-wet random network model representing Berea sandstone to compute displacement paths and relative
permeabilities for water alternating gas (WAG) flooding. First we reproduce cycles of water and gas injection observed in
previously published experimental studies. We predict the measured oil, water and gas relative permeabilities accurately.
We discuss the hysteresis trends in the water and gas relative permeabilities and compare the behavior of water-wet and oil-wet
media. We interpret the results in terms of pore-scale displacements. In water-wet media the water relative permeability is
lower during water injection in the presence of gas due to an increase in oil/water capillary pressure that causes a decrease
in wetting layer conductance. The gas relative permeability is higher for displacement cycles after first gas injection at
high gas saturation due to cooperative pore filling, but lower at low saturation due to trapping. In oil-wet media, the water
relative permeability remains low until water-filled elements span the system at which point the relative permeability increases
rapidly. The gas relative permeability is lower in the presence of water than oil because it is no longer the most non-wetting
phase. |
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Keywords: | network modeling three-phase flow wettability relative permeability multiple displacements pore occupancy |
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