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    An Efficient Upscaling Process Based on a Unified Fine-scale Multi-Physics Model for Flow Simulation in Naturally Fracture Carbonate Karst Reservoirs

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    Type
    Conference Paper
    Authors
    Bi, Linfeng
    Qin, Guan
    Popov, Peter
    Efendiev, Yalchin R. cc
    Espedal, Magne
    KAUST Grant Number
    KUS-C1-016-04
    Date
    2013-04-04
    Online Publication Date
    2013-04-04
    Print Publication Date
    2009
    Permanent link to this record
    http://hdl.handle.net/10754/597519
    
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    Abstract
    The main challenges in modeling fluid flow through naturally-fractured carbonate karst reservoirs are how to address various flow physics in complex geological architectures due to the presence of vugs and caves which are connected via fracture networks at multiple scales. In this paper, we present a unified multi-physics model that adapts to the complex flow regime through naturally-fractured carbonate karst reservoirs. This approach generalizes Stokes-Brinkman model (Popov et al. 2007). The fracture networks provide the essential connection between the caves in carbonate karst reservoirs. It is thus very important to resolve the flow in fracture network and the interaction between fractures and caves to better understand the complex flow behavior. The idea is to use Stokes-Brinkman model to represent flow through rock matrix, void caves as well as intermediate flows in very high permeability regions and to use an idea similar to discrete fracture network model to represent flow in fracture network. Consequently, various numerical solution strategies can be efficiently applied to greatly improve the computational efficiency in flow simulations. We have applied this unified multi-physics model as a fine-scale flow solver in scale-up computations. Both local and global scale-up are considered. It is found that global scale-up has much more accurate than local scale-up. Global scale-up requires the solution of global flow problems on fine grid, which generally is computationally expensive. The proposed model has the ability to deal with large number of fractures and caves, which facilitate the application of Stokes-Brinkman model in global scale-up computation. The proposed model flexibly adapts to the different flow physics in naturally-fractured carbonate karst reservoirs in a simple and effective way. It certainly extends modeling and predicting capability in efficient development of this important type of reservoir.
    Citation
    Bi L, Qin G, Popov P, Efendiev Y, Espedal M (2009) An Efficient Upscaling Process Based on a Unified Fine-scale Multi-Physics Model for Flow Simulation in Naturally Fracture Carbonate Karst Reservoirs. SPE/EAGE Reservoir Characterization and Simulation Conference. Available: http://dx.doi.org/10.2118/125593-ms.
    Sponsors
    This publication is partly based on work supported by Award No. KUS-C1-016-04, made by King Abdullah University of Science and Technology (KAUST). The authors also gratefully acknowledge the support from Research Inst. of Petroleum Exploration and Development of Sinopec Corp.
    Publisher
    Society of Petroleum Engineers (SPE)
    Journal
    SPE/EAGE Reservoir Characterization and Simulation Conference
    DOI
    10.2118/125593-ms
    ae974a485f413a2113503eed53cd6c53
    10.2118/125593-ms
    Scopus Count
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    Publications Acknowledging KAUST Support

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