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A new grid block system for reducting grid orientation effect in oil reservoir simulation process |
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A new grid block system for reducting grid orientation effect in oil reservoir simulation process Authors: E. Chong, Z. Syihab, E. Putra, D. Hidayati, D. Schechter
The grid orientation effect (GOE) is a long-standing problem plaguing reservoir simulators that employ
fi nite difference schemes. A rotation of the computational grids yields a substantially different solution
under certain circumstances. A Cartesian grid with one axis parallel to the line joining an injector and
producer gives a solution signifi cantly different from a grid that has the axes oriented at 45° to this line.
This paper presents a new grid system that can reduce the grid orientation effect. This system involves
using a unique grid-block assignment where rectangular grid blocks are interspersed with octagonal
grid blocks. The boundaries are populated with triangular grid blocks. The entire domain consists of
a “structured” grid block system referred to as the Hybrid Grid Block (HGB).
Keywords: Grid orientation effect, Numerical simulation, Finite-Difference scheme, Unfavorable mobility
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2011