A segregated flow scheme to control numerical dispersion for multi-component flow simulations |
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| Authors: | Abdulkareem M AlSofi Martin J Blunt |
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| Institution: | 1. Department of Earth Science and Engineering, Imperial College London, London, UK
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| Abstract: | One of the challenges for reservoir simulation is numerical dispersion. For waterflooding applications the effect is controlled
due to the self-sharpening nature of a Buckley–Leverett shock. However, for multi-component flow simulations, incorrect wavespeeds
can develop leading to the excessive smearing of fronts because of the coupling of compositional dispersion with the fractional
flow. Rather than implementing a higher-order discretization method, we propose a simple scheme based on segregation-in-flow
within a gridblock to control numerical dispersion. We extend the method originally proposed for polymer flooding to augmented
waterflooding simulations in general as well as simulations of miscible or near miscible gas injection. For compositional
simulations of gas injection, this is done through a coupled limited-flash/upstream-exclusion assumption. To test the scheme,
an in-house streamline simulator has been modified and validated for modeling low-salinity floods as well as ternary two-phase
displacements. Simulation results presented with and without segregation demonstrate the potential of the approach as a heuristic
method to control numerical dispersion in multi-component flow simulations. |
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