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Permeability coupling model of multiple migration mechanisms in rough micro-fractures of shales

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  • Yang, Shanshan
  • Wang, Mengying
  • Zou, Mingqing
  • Sheng, Qiong
  • Cui, Ruike
  • Chen, Shuaiyin

Abstract

To study the gas transmission characteristics in organic pores of rough shale reservoirs, firstly, considering the effect of roughness, adsorption layer, and stress sensitivity on fracture width variation, the effective fracture width model was established. On this basis, the real gas transport models of the adsorbed gas and bulk gas in rough reservoirs have been studied respectively, and the apparent permeability coupling model of rough microfracture of shale are proposed according to the difference of actual flow area. The validity of the proposed models was verified by comparing them with the simulation data, and the contribution of each migration mechanism to the total flow under different roughness and fracture width variation factors was analyzed. It is found that the formation pressure is proportional to the influence of roughness on permeability. When the initial crack width increases, the corresponding pore pressure decreases when the roughness has a greater influence on the proportion of slip flow. The influence of roughness on the Knudsen diffusion ratio and surface diffusion ratio will be greater when the initial crack width is smaller. In addition, if the initial crack width and pore pressure are constant, the greater the relative roughness, the greater the Knudsen diffusion ratio and surface diffusion ratio, and the smaller the slippage flow proportion.

Suggested Citation

  • Yang, Shanshan & Wang, Mengying & Zou, Mingqing & Sheng, Qiong & Cui, Ruike & Chen, Shuaiyin, 2023. "Permeability coupling model of multiple migration mechanisms in rough micro-fractures of shales," Chaos, Solitons & Fractals, Elsevier, vol. 174(C).
    • Handle: RePEc:eee:chsofr:v:174:y:2023:i:c:s0960077923006902
    DOI: 10.1016/j.chaos.2023.113789
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    References listed on IDEAS

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    1. Boqi Xiao & Min Zhang & Hanxin Chen & Jiyin Cao & Gongbo Long & Zheng Zhao, 2021. "A Fractal Model For Predicting The Effective Thermal Conductivity Of Roughened Porous Media With Microscale Effect," FRACTALS (fractals), World Scientific Publishing Co. Pte. Ltd., vol. 29(05), pages 1-10, August.
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    3. Shuang Yi & Sheng Zheng & Shanshan Yang & Guangrong Zhou, 2022. "Fractal Analysis Of Stokes Flow In Tortuous Microchannels With Hydraulically Rough Surfaces," FRACTALS (fractals), World Scientific Publishing Co. Pte. Ltd., vol. 30(09), pages 1-16, December.
    4. Fang, Fang & Babadagli, Tayfun, 2017. "Dynamics of diffusive and convective transport in porous media: A fractal analysis of 3-D images obtained by laser technology," Chaos, Solitons & Fractals, Elsevier, vol. 95(C), pages 1-13.
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    Cited by:

    1. Yang, Shanshan & Wang, Mengying & Zou, Mingqing & Sheng, Qiong & Cui, Ruike & Chen, Shuaiyin, 2023. "Gas transport law in inorganic nanopores considering the influence of cross section shape and roughness," Chaos, Solitons & Fractals, Elsevier, vol. 175(P2).

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