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Fluid Displacement in a Dual-Permeability Medium with Local Capillary Equilibrium

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Abstract

The solution to the Buckley–Leverett problem in fractured porous media is investigated by applying the dual-porosity dual-permeability model. It is shown that the dual-permeability medium is equivalent to an upscaled homogenized medium at long injection times when local capillary equilibrium is established. Simple analytical relationships for the petrophysical properties and saturation functions of the equivalent medium are derived. The upscaled relative permeability and the fractional flow function can exhibit kinks, resulting in more complicated solutions to the Buckley–Leverett problem as compared to the classical case. It is found that immiscible displacement in fractured porous media leads to the appearance of saturation profiles with several displacement fronts and rarefaction waves. Up to four solution types are possible, which are constrained in a solution map constructed in the space of the dimensionless parameters of the problem. It is shown that, for particular parameters, the displacing fluid moves faster through the matrix than through the fractures.

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Acknowledgements

Funding for this work was provided by the RF President’s Council on Grants (MD-3567.2018.1).

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Correspondence to Andrey Afanasyev.

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Afanasyev, A. Fluid Displacement in a Dual-Permeability Medium with Local Capillary Equilibrium. Transp Porous Med 135, 513–533 (2020). https://doi.org/10.1007/s11242-020-01486-x

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