Analytical and numerical investigation of multicomponent multiphase WAG displacements |
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| Authors: | Tara LaForce Kristian Jessen |
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| Institution: | (1) Department of Chemical and Petroleum Engineering, University of Wyoming, Laramie, WY 82070, USA;(2) Department of Chemical Engineering and Materials Science, University of Southern California, Los Angeles, CA 90089, USA;(3) Department of Energy Resources Engineering, Stanford University, Stanford, CA 94305, USA |
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| Abstract: | In this paper the ability of analytical solutions for four-component three-phase flow to predict displacement efficiency in
water alternating gas (WAG) injection processes is studied. First analytical solutions for Riemann problems with injection
compositions that are the average water and gas mixture for various WAG injection schemes are presented. These solutions are
compared to numerical calculations with variable slug sizes and used to explore the effect of slug size, injecting water vs
gas first, and the average injection composition on displacement efficiency in compositional WAG schemes. The example model
is partially miscible WAG injection of water and CO2 into an oil reservoir containing C10 and CH4 with and without a mobile aqueous phase present initially. The trailing end of the water and gas profiles are sensitive to
whether water or gas is injected first, but the magnitude of the oil bank and the breakthrough time of the injected fluids
are accurately predicted by the analytical solutions, even for displacements where large water and gas slugs are injected.
Fluctuations in the saturation and composition profiles resulting from the alternating injection sequence in the WAG simulations
appear as super-imposed on top of the sequence of rarefaction and shock waves predicted by analytical solutions. As the number
of slugs increases, the effect of alternating boundary conditions diminishes and the displacements predicted by numerical
calculations converge to the analytical solutions. |
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