Generation of coarse‐scale continuum flow models from detailed fracture characterizations

Karimi-Fard, Mohammad; Gong, Bin; Durlofsky, Louis J.

doi:10.1029/2006wr005015

Cited by 133 publications

(102 citation statements)

References 43 publications

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“…In numerical upscaling, a geometric representation of the fracture network is generated and meshed. A set of boundary conditions is applied, and the resulting flux through the matrix-fracture system is calculated [6,9]. In analytical upscaling, the true fracture network is represented by a simplified, idealized geometry, whose properties is calculated analytically [13,15,21].…”

Section: Fracture Upscaling Modelmentioning

confidence: 99%

History matching of dual continuum reservoirs—preserving consistency with the fracture model

Sævik

Lien²,

Berre

2017

Comput Geosci

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Ensemble-and optimization-based parameter estimation is commonly used to calibrate simulation models of fractured reservoirs to measured data. Traditionally, statistical data on small-scale fractures are upscaled to a dual continuum model in a single step, and the subsequent history matching procedure makes adjustments to the upscaled parameters. In this paper, we show that the resulting reservoir models may be inconsistent with the initial fracture description, meaning that the reservoir parameters do not correspond to a physically valid combination of fracture parameters. A number of numerical examples is provided, which illustrate why and when the problem occurs. We utilize an invertible analytical fracture upscaling method, and deviations from the fracture model can thus be quantified in each case. We show that consistency with the fracture model is preserved if fracture parameters are history matched directly, if the relation between inversion variables and fracture parameters is linear, or if an unbiased Bayesian sampling method is used. We also show that preserving consistency is less important if the uncertainty of the fracture upscaling method is large.

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Section: Fracture Upscaling Modelmentioning

confidence: 99%

History matching of dual continuum reservoirs—preserving consistency with the fracture model

Sævik

Lien²,

Berre

2017

Comput Geosci

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“…Note that the procedure applied here is similar to the corner-point system discussed in Karimi-Fard et al [40]. Equation (13) is also used to compute the transmissibility factor for matrix-fracture connections.…”

Section: Numerical Discretization and Prismatic Meshing Strategiesmentioning

confidence: 99%

Discrete Fracture Modeling of 3D Heterogeneous Enhanced Coalbed Methane Recovery with Prismatic Meshing

Zhang

Gong

et al. 2015

Energies

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Abstract:In this study, a 3D multicomponent multiphase simulator with a new fracture characterization technique is developed to simulate the enhanced recovery of coalbed methane. In this new model, the diffusion source from the matrix is calculated using the traditional dual-continuum approach, while in the Darcy flow scale, the Discrete Fracture Model (DFM) is introduced to explicitly represent the flow interaction between cleats and large-scale fractures. For this purpose, a general formulation is proposed to model the multicomponent multiphase flow through the fractured coal media. The S&D model and a revised P&M model are incorporated to represent the geomechanical effects. Then a finite volume based discretization and solution strategies are constructed to solve the general ECBM equations. The prismatic meshing algorism is used to construct the grids for 3D reservoirs with complex fracture geometry. The simulator is validated with a benchmark case in which the results show close agreement with GEM. Finally, simulation of a synthetic heterogeneous 3D coal reservoir modified from a published literature is performed to evaluate the production performance and the effects of injected gas composition, well pattern and gas buoyancy.

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“…The research was first carried out by Dershowitz et al [23] and Sarda et al [24] and extended by others later [25,26]. Karimi-Fard et al [27] and Gong et al [28] developed a flow-based upscaling technique, which is referred to as the multiple subregion (MSR) method to construct dual-porosity models from detailed fracture characterizations. This method implements a flow-based division of subgrids and calculates the transmissibilities between each connected coarse blocks based on the discrete fracture network.…”

Section: Introductionmentioning

confidence: 99%

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

Lei

Qin

et al. 2015

Energies

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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. OPEN ACCESSEnergies 2015, 8 10179

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Generation of coarse‐scale continuum flow models from detailed fracture characterizations

Cited by 133 publications

References 43 publications

History matching of dual continuum reservoirs—preserving consistency with the fracture model

History matching of dual continuum reservoirs—preserving consistency with the fracture model

Discrete Fracture Modeling of 3D Heterogeneous Enhanced Coalbed Methane Recovery with Prismatic Meshing

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

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