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Volume 43 Issue 5
Sep.  2021
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Article Navigation >  PETROLEUM GEOLOGY & EXPERIMENT  > 2021  >  43(5): 844-854
ZOU Yu, WANG Guojian, LU Li, ZHU Huaiping, LIU Guangxiang, YUAN Yusong, YANG Haiyuan, JIN Zhijun. Simulation experiment and mathematical model analysis for shale gas diffusion in nano-scale pores[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2021, 43(5): 844-854. doi: 10.11781/sysydz202105844
Citation: ZOU Yu, WANG Guojian, LU Li, ZHU Huaiping, LIU Guangxiang, YUAN Yusong, YANG Haiyuan, JIN Zhijun. Simulation experiment and mathematical model analysis for shale gas diffusion in nano-scale pores[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2021, 43(5): 844-854. doi: 10.11781/sysydz202105844
shu

Simulation experiment and mathematical model analysis for shale gas diffusion in nano-scale pores

doi: 10.11781/sysydz202105844
  • 1.

    SINOPEC Key Laboratory of Petroleum Accumulation Mechanisms, SINOPEC, Wuxi, Jiangsu 214126, China

  • 2.

    Wuxi Research Institute of Petroleum Geology, SINOPEC, Wuxi, Jiangsu 214126, China

  • 3.

    SINOPEC Petroleum Exploration and Production Research Institute, Beijing 102206, China

  • 4.

    State Key Laboratory of Shale Oil and Gas Enrichment and Effective Development, Beijing 102206, China

  • 5.

    Energy Institute, Peking University, Beijing 100087, China

  • Received Date: 2021-06-22
  • Rev Recd Date: 2021-08-04
  • Publish Date: 2021-09-28
    Abstract
  • Gas diffusion in nano-scale porous media of deeply burried shale includes bulk diffusion (Fick and Knudsen diffusions) and surface diffusion. To reveal the migration mechanism of this process, the influence of temperature and pressure on diffusion coefficient needs to be quantitatively evaluated. A case study was made with the Cambrian Niutitang Formation in the Maoping area, Zigui, western Hubei, South China. Gas diffusion was simulated by isobaric diffusion experiments under different temperature and pressure conditions. The results indicated that: (1) The diffusion coefficient DF decreases with increasing of pressure (when the pressure is higher than 30 MPa, DF tends to be constant), and increases with increasing of temperature; (2) In the high temperature-pressure setting, DF is affected significantly by pressure and generally tends to decrease. Moreover, the impacts of temperature, pressure, porosity and lithology were quantitatively calculated, and a mathematical model of gas diffusion was established, which had comparable results with simulation experiment. The following conclusions were thus drawn: (1)Higher temperature will cause stronger molecular kinetic energy, resulting in increasing bulk and surface diffusion coefficients, while higher pressure will slightly strengthen the Fick and surface diffusions, but significantly limit the Knudsen diffusion, and cause lower total diffusion coefficient; (2) Larger pore size leads to stronger bulk diffusion, but weaker surface diffusion. Finally, according to the studies of a specific research block, high pressure setting is conducive to the preservation of nano-scale porous gas reservoir in shale, while the uplift accompanied by pressure release is the main stage of shale gas loss.

     

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