Development of a three-dimensional, three-phase, quadruple-porosity/quadruple-permeability white oil type simulator with embedded discrete fracture model for predicting shale gas/oil flow behavior

Takuto Sakai, Masanori Kurihara

    Research output: Contribution to conferencePaper

    Abstract

    Shale gas/oil is attracting remarkable attention in the world because of their vast technically recoverable reserves. However, it is difficult to predict gas/oil flow behavior in shale gas/oil reservoirs due to their unique features. In general, the dual-porosity/dual-permeability (fracture and matrix) simulator is used for numerical simulation of shale gas/oil reservoirs. In fact, shale gas/oil reservoirs have more complicated structure, and hence, the dual-porosity/dual-permeability model cannot reproduce the gas/oil flow behavior in shale gas/oil reservoirs rigorously. Taking account of this background, a novel reservoir simulator was developed for predicting shale gas/oil flow behavior in this study. We developed the white oil type simulator that can deal with three-dimensional, three-phase, quadruple-porosity/ quadruple-permeability flow behavior. The white oil type simulator enables to account for the deposition of condensate from gas phase and the quadruple-porosity/ quadruple-permeability model can reproduce the fluid flow among induced hydraulic fractures, natural fractures, matrices and organic matrices, which may exist in shale gas/oil reservoirs. Furthermore, the embedded discrete fracture model (EDFM) was incorporated into this simulator to express more realistic induced fracture distributions. This method enables to define the domain of each induced fracture regardless of the definition of grid blocks, which results in the construction of a reservoir model with more reliable fracture distributions. After the verification of this simulator with analytical solutions and dual-porosity/dual-permeability commercial simulator, sensitivity studies were conducted, which revealed the importance of considering complex shale structure and the parameters affecting the shale gas/oil production behavior significantly. Through this study, three main conclusions were drawn: (1) benefits of the quadruple-porosity/quadruple-permeability model, (2) importance of organic matrices in the development of shale reservoirs and (3) advantage of embedded discrete fracture model.

    Original languageEnglish
    Publication statusPublished - 2017 Jan 1
    Event23rd Formation Evaluation Symposium of Japan 2017 - Chiba, Japan
    Duration: 2017 Oct 112017 Oct 12

    Other

    Other23rd Formation Evaluation Symposium of Japan 2017
    CountryJapan
    CityChiba
    Period17/10/1117/10/12

    Fingerprint

    Gas oils
    simulator
    Oils
    Porosity
    Simulators
    porosity
    permeability
    oil
    dual porosity
    matrix
    Shale
    shale
    shale gas
    Shale gas
    gas
    condensate
    Flow of fluids
    oil production
    fluid flow
    Gases

    ASJC Scopus subject areas

    • Geotechnical Engineering and Engineering Geology
    • Geology
    • Energy Engineering and Power Technology
    • Economic Geology
    • Geochemistry and Petrology

    Cite this

    Development of a three-dimensional, three-phase, quadruple-porosity/quadruple-permeability white oil type simulator with embedded discrete fracture model for predicting shale gas/oil flow behavior. / Sakai, Takuto; Kurihara, Masanori.

    2017. Paper presented at 23rd Formation Evaluation Symposium of Japan 2017, Chiba, Japan.

    Research output: Contribution to conferencePaper

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    abstract = "Shale gas/oil is attracting remarkable attention in the world because of their vast technically recoverable reserves. However, it is difficult to predict gas/oil flow behavior in shale gas/oil reservoirs due to their unique features. In general, the dual-porosity/dual-permeability (fracture and matrix) simulator is used for numerical simulation of shale gas/oil reservoirs. In fact, shale gas/oil reservoirs have more complicated structure, and hence, the dual-porosity/dual-permeability model cannot reproduce the gas/oil flow behavior in shale gas/oil reservoirs rigorously. Taking account of this background, a novel reservoir simulator was developed for predicting shale gas/oil flow behavior in this study. We developed the white oil type simulator that can deal with three-dimensional, three-phase, quadruple-porosity/ quadruple-permeability flow behavior. The white oil type simulator enables to account for the deposition of condensate from gas phase and the quadruple-porosity/ quadruple-permeability model can reproduce the fluid flow among induced hydraulic fractures, natural fractures, matrices and organic matrices, which may exist in shale gas/oil reservoirs. Furthermore, the embedded discrete fracture model (EDFM) was incorporated into this simulator to express more realistic induced fracture distributions. This method enables to define the domain of each induced fracture regardless of the definition of grid blocks, which results in the construction of a reservoir model with more reliable fracture distributions. After the verification of this simulator with analytical solutions and dual-porosity/dual-permeability commercial simulator, sensitivity studies were conducted, which revealed the importance of considering complex shale structure and the parameters affecting the shale gas/oil production behavior significantly. Through this study, three main conclusions were drawn: (1) benefits of the quadruple-porosity/quadruple-permeability model, (2) importance of organic matrices in the development of shale reservoirs and (3) advantage of embedded discrete fracture model.",
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