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• W2078568071 abstract "Abstract Complex corner point grids are often encountered in reservoir simulation. Such grids can be severely faulted and the corner point cells near faults, and elsewhere, can be distorted. Also, extensive refinements may be used. Since such grids are usually presented without specific information regarding inter-cell contact, it is up to the reservoir simulator to decide when to connect blocks together to permit fluid flow, and also, in many cases, how to build the more extensive computational template required to model dispersive fluxes. The latter can be particularly complicated since directions both perpendicular to, and parallel with, the usual flow directions have to be resolved. Nevertheless, dispersive mixing is often a required feature, such as when modelling gas storage reservoirs where cushion gas and fuel gas commingle, or when examining convective mixing as a primary drive mechanism, such as for the VAPEX process. A corner point grid cell starts with eight points, and can be described as the volume contained within surfaces that are stretched across the corner points associated with each of its six faces. Face contact (or near-contact) can be specified as the requirement for flow to occur from cell to cell. The contact can be full (the four face corner points are shared by each cell), or partial. The first case is easy to detect, while the latter is more complicated, breaking down into sub-cases that will be described in this paper. Once contacts are established and overlap areas are determined, suitable transmissibilities can be defined. Refined grids need to be seamlessly incorporated into all of the above. These can be difficult to work with if several layers of refinement are present. Once connectivities have been determined, an extended computational molecule has to built around each cell to allow for the computation of dispersive fluxes to take place. Since directions have to be resolved both parallel with, and perpendicular to, the Darcy phase velocities, an enlarged template is required. An algorithm will be described for processing lists of cell contacts to devise a suitable template for resolution of parallel and perpendicular flows. Once the template has been built, a method for computing the required longitudinal and transverse dispersive fluxes will be given. Results of computations made using the above algorithms for building flow connections will be described. In particular, the effects of longitudinal and transverse dispersion will be shown." @default.
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• W2078568071 date "2000-10-01" @default.
• W2078568071 modified "2023-09-30" @default.
• W2078568071 title "Calculation of Convective and Dispersive Flows for Complex Corner Point Grids" @default.
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• W2078568071 doi "https://doi.org/10.2118/62929-ms" @default.
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