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Rate Decline Analysis of Vertically Fractured Wells in Shale Gas Reservoirs

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  • Xiaoyang Zhang

    (School of Energy Resources, China University of Geosciences (Beijing), Beijing 100083, China
    Beijing Key Laboratory of Unconventional Natural Gas Geological Evaluation and Development Engineering, Beijing 100083, China
    Key Laboratory of Strategy Evaluation for Shale Gas, Ministry of Land and Resources, Beijing 100083, China)

  • Xiaodong Wang

    (School of Energy Resources, China University of Geosciences (Beijing), Beijing 100083, China
    Beijing Key Laboratory of Unconventional Natural Gas Geological Evaluation and Development Engineering, Beijing 100083, China)

  • Xiaochun Hou

    (School of Energy Resources, China University of Geosciences (Beijing), Beijing 100083, China
    Beijing Key Laboratory of Unconventional Natural Gas Geological Evaluation and Development Engineering, Beijing 100083, China)

  • Wenli Xu

    (School of Energy Resources, China University of Geosciences (Beijing), Beijing 100083, China
    Key Laboratory of Strategy Evaluation for Shale Gas, Ministry of Land and Resources, Beijing 100083, China)

Abstract

Based on the porous flow theory, an extension of the pseudo-functions approach for the solution of non-linear partial differential equations considering adsorption-desorption effects was used to investigate the transient flow behavior of fractured wells in shale gas reservoirs. The pseudo-time factor was employed to effectively linearize the partial differential equations of the unsteady flow response. The production performance of vertically fractured wells in shale gas reservoirs under either constant flow rate or constant bottom-hole pressure conditions was analyzed using the composite flow model. The calculation results indicate that the non-linearities that develop in the gas diffusivity equation have significant effects on the unsteady response, leading to a larger pressure depletion and rate decline in the late-time period. In addition, gas desorption from the shale acts as a recharge source, which relieves the gas production rate of decline. Greater values for the Langmuir volumes or Langmuir pressures provide additional pressure support, leading to a lower rate decline while the flowing well bottom-hole pressure is maintained. The reservoir size mainly affects the duration of the pressure depletion and rate decline. In the case of ignoring the non-linearity and adsorption-desorption effect in the differential equation, a greater rate decline under constant bottom-hole pressure production can be obtained during the boundary-dominated depletion. This work provides a better understanding of gas desorption in shale gas reservoirs and new insight into investigating the production performances of fractured gas well.

Suggested Citation

  • Xiaoyang Zhang & Xiaodong Wang & Xiaochun Hou & Wenli Xu, 2017. "Rate Decline Analysis of Vertically Fractured Wells in Shale Gas Reservoirs," Energies, MDPI, vol. 10(10), pages 1-24, October.
  • Handle: RePEc:gam:jeners:v:10:y:2017:i:10:p:1602-:d:114803
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    Citations

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    Cited by:

    1. Youwei He & Shiqing Cheng & Zhenhua Rui & Jiazheng Qin & Liang Fu & Jianguo Shi & Yang Wang & Dingyi Li & Shirish Patil & Haiyang Yu & Jun Lu, 2018. "An Improved Rate-Transient Analysis Model of Multi-Fractured Horizontal Wells with Non-Uniform Hydraulic Fracture Properties," Energies, MDPI, vol. 11(2), pages 1-17, February.
    2. Bing Sun & Wenyang Shi & Rui Zhang & Shiqing Cheng & Chengwei Zhang & Shiying Di & Nan Cui, 2020. "Transient Behavior of Vertical Commingled Well in Vertical Non-Uniform Boundary Radii Reservoir," Energies, MDPI, vol. 13(9), pages 1-13, May.
    3. Prinisha Manda & Diakanua Bavon Nkazi, 2020. "The Evaluation and Sensitivity of Decline Curve Modelling," Energies, MDPI, vol. 13(11), pages 1-16, June.

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