Upscaling For Reservoir Simulation Using Multi-Layer Directional 2 Phase Pseudofunctions
Abstract/Contents
- Abstract
- A new multi-layer algorithm for generating pseudofunctions for reservoir upscaling is presented. The algorithm computes effective flow properties for coarse-grid simulations from the results o f fine-grid simulations. The Hewett-Archer approach, which is comprised of collapsing the whole cross-sectional grid into a single layer to compute effective relative permeabilities for 2-D problems, is employed. The multi-layer pseudofunction algorithm essentially applies the Hewett-Archer approach to a 2-D cross-section, but in multiple layers in the vertical instead of one single layer. A fine-grid simulation is initially performed to extract phase fluxes and phase potentials. A streamtube is defined for each fine-grid cell comprising a coarse gridblock outlet face. Streamtubes run between iso-potential lines through the centers of adjacent coarse gridblocks. Integrated phase mobilities are then conceptually computed in these streamtube segments to obtain effective relative permeabilities. The new approach bears the advantage of being able to better capture reservoir heterogeneity in various layers. The algorithm is versatile and can handle injection/production scenarios with partially completed wells. The excellent results obtained after validation runs on 2-D homogeneous and heterogeneous cross-sections reproduce the fine-grid profiles.A significant reduction in simulation run-times without any critical loss in incorporating fine-scale heterogeneity is another attractive feature of this multilayer upscaling algorithm. The algorithm is also applicable to 3-D problems by splitting the 3-D grid into a series of 2.-D cross-sections in the X and Y directions, each cross-section comprising multiple layers in the vertical. The results obtained are satisfactory. The deviations between coarse-grid and fine-scale profiles increase as the well configurations get complex and the injection patterns get tighter. This approach has limitations in that i t does not capture, and hence, cannot mimic flow within cross-sections in the 3-D grid, which were not used to generate the upscaling pseudofunctions.
Description
| Type of resource | text |
|---|---|
| Date created | September 1998 |
Creators/Contributors
| Author | Kumar, Apurva |
|---|---|
| Primary advisor | Hewett, Thomas A. |
| Degree granting institution | Stanford University, Department of Petroleum Engineering |
Subjects
| Subject | School of Earth Energy & Environmental Sciences |
|---|---|
| Genre | Thesis |
Bibliographic information
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Preferred citation
- Preferred Citation
- Kumar, Apurva. (1998). Upscaling For Reservoir Simulation Using Multi-Layer Directional 2 Phase Pseudofunctions. Stanford Digital Repository. Available at: https://purl.stanford.edu/jg253jk2516
Collection
Master's Theses, Doerr School of Sustainability
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