Use of Border Regions for Improved Permeability Upscaling |
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| Authors: | X H Wen L J Durlofsky and M G Edwards |
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| Institution: | (1) ChevronTexaco Exploration & Production Technology Company, San Ramon, California, 94583-0719;(2) Department of Petroleum Engineering, Stanford University, Stanford, California, 94305-2220;(3) Chevron Texaco, USA;(4) Department of Civil Engineering, University of Wales, Swansea, Swansea, SA2 8PP, United Kingdom |
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| Abstract: | A procedure for the improved calculation of upscaled grid block permeability tensors on Cartesian grids is described and applied. The method entails the use of a border region of fine-scale cells surrounding the coarse block for which the upscaled permeability is to be computed. The implementation allows for the use of full-tensor permeability fields on the fine and coarse scales. Either periodic or pressure–no flow boundary conditions are imposed over the extended local domain (target block plus border regions) though averaged quantities, used to compute the upscaled permeability tensor, are computed only over the target block region. Flow and transport results using this procedure are compared to those from standard methods for different types of geological and simulation models. Improvement using the new approach is consistently observed for the cases considered, though the degree of improvement varies for different models and flow quantities. |
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| Keywords: | scale up permeability tensor reservoir simulation equivalent block permeability |
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