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Abstract

Summary

The fully implicit method is the most commonly used approach to solve black-oil problems in reservoir simulation. The method requires repeated linearization of large nonlinear systems and produces ill-conditioned linear systems. We present a strategy to reduce computational time that relies on two key ideas: i) a sequential formulation that decouples flow and transport into separate subproblems, and ii) a highly efficient Gauss-Seidel solver for the transport problems. This solver uses intercell fluxes to find all cells that only depend on their upstream neighbors and groups all remaining cells into local clusters of cells that are mutually dependent because of counter-current flow. The single cells and local clusters can then be sorted and solved in sequence, starting from the inflow and moving gradually downstream, since each new cell or local cluster will only depend on upstream neighbors that have already been computed. Altogether, this gives optimal localization and control of the nonlinear solution process.

This method has been successfully applied to real-field problems using the standard first-order finite volume discretization. Here, we extend the idea to first-order dG methods on fully unstructured grids. We also demonstrate proof of concept for the reordering idea by applying it to the full simulation model of the Norne oil field, using a prototype variant of open source OPM Flow simulator.

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/content/papers/10.3997/2214-4609.201802130
2018-09-03
2024-04-19

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Nonlinear Gauss-Seidel Solvers With Higher Order For Black-Oil Models
Conference Proceedings 2018, 1 (2018); https://doi.org/10.3997/2214-4609.201802130
/content/papers/10.3997/2214-4609.201802130
/content/papers/10.3997/2214-4609.201802130
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