Pore-scale simulation of water alternate gas injection

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XVI International Conference on Computational Methods in Water Resources (CMWR-XVI) Ingeniørhuset

Pore-scale simulation of water alternate gas injection
Paper
Author:Vural Suicmez <vss@imperial.ac.uk> (PhD student at Imperial College)
Mohammad Piri <mpriri@princeton.edu> (Research Associate at Princeton University)
Martin Blunt <m.blunt@imperial.ac.uk> (Prof at Imperial College)
Presenter:Vural Suicmez <vss@imperial.ac.uk> (PhD student at Imperial College)
Date: 2006-06-18     Track: Special Sessions     Session: Pore-Scale Modelling: New Developments And Applications
DOI:10.4122/1.1000000503
DOI:10.4122/1.1000000504

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 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.