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Energies 2015, 8(9), 10178-10197; doi:10.3390/en80910178

Effective Local-Global Upscaling of Fractured Reservoirs under Discrete Fractured Discretization

1
Department of Energy & Resources Engineering, College of Engineering, Peking University, Beijing 100871, China
2
Research Institute of Petroleum Exploration and Development, PetroChina, Beijing 100083, China
3
Department of Chemical & Biomolecular Engineering, University of Houston, Houston, TX 77004, USA
*
Author to whom correspondence should be addressed.
Academic Editor: Edwin A. Cowen
Received: 3 April 2015 / Revised: 17 August 2015 / Accepted: 10 September 2015 / Published: 17 September 2015
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Abstract

The subsurface flow in fractured reservoirs is strongly affected by the distribution of fracture networks. Discrete fracture models, which represent all fractures individually by unstructured grid systems, are thus developed and act as a more accurate way for fractured reservoir simulation. However, it is usually not realistic to directly apply discrete fracture models to simulate field scale models for efficiency reasons. There is a need for upscaling techniques to coarsen the high resolution fracture descriptions to sizes that can be accommodated by reservoir simulators. In this paper, we extended the adaptive local-global upscaling technique to construct a transmissibility-based dual-porosity dual-permeability model from discrete fracture characterizations. An underlying unstructured fine-scale grid is firstly generated as a base grid. A global coarse-scale simulation is performed to provide boundary conditions for local regions and local upscaling procedures are carried out in every local region for transmissibility calculations. Iterations are performed until the consistency between the global and local properties is achieved. The procedure is applied to provide dual-porosity dual-permeability (DPDK) parameters including coarse-scale matrix-matrix, fracture-fracture and matrix-fracture flux transmissibilities. The methodology is applied to several cases. The simulation results demonstrate the accuracy, efficiency and robustness of the proposed method. View Full-Text
Keywords: fractured reservoir; upscaling; discrete-fracture models (DFMs); DPDK; reservoir simulation fractured reservoir; upscaling; discrete-fracture models (DFMs); DPDK; reservoir simulation
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Li, J.; Lei, Z.; Qin, G.; Gong, B. Effective Local-Global Upscaling of Fractured Reservoirs under Discrete Fractured Discretization. Energies 2015, 8, 10178-10197.

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