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Analytical Study of Permeability Properties of Loose Sandstone Based on Thermal-Hydraulic-Mechanical (THM) Coupling

Author

Listed:
  • Rui Cui

    (College of New Energy and Environment, Jilin University, Changchun 130021, China)

  • Bo Feng

    (College of New Energy and Environment, Jilin University, Changchun 130021, China)

  • Xiaofei Duan

    (The Second Institute of Hydrogeology and Engineering Geology, Shandong Provincial Bureau of Geology & Mineral Resources (Lubei Geo-Engineering Exploration Institute), Dezhou 253072, China
    Shandong Provincial Research Center of Geothermal Resources and Reinjection, Dezhou 253072, China)

  • Jichu Zhao

    (The Second Institute of Hydrogeology and Engineering Geology, Shandong Provincial Bureau of Geology & Mineral Resources (Lubei Geo-Engineering Exploration Institute), Dezhou 253072, China
    Shandong Provincial Research Center of Geothermal Resources and Reinjection, Dezhou 253072, China)

  • Yabin Yang

    (The Second Institute of Hydrogeology and Engineering Geology, Shandong Provincial Bureau of Geology & Mineral Resources (Lubei Geo-Engineering Exploration Institute), Dezhou 253072, China
    Shandong Provincial Research Center of Geothermal Resources and Reinjection, Dezhou 253072, China)

  • Shoutao Feng

    (The Second Institute of Hydrogeology and Engineering Geology, Shandong Provincial Bureau of Geology & Mineral Resources (Lubei Geo-Engineering Exploration Institute), Dezhou 253072, China
    Shandong Provincial Research Center of Geothermal Resources and Reinjection, Dezhou 253072, China)

  • Yilong Yuan

    (College of New Energy and Environment, Jilin University, Changchun 130021, China)

Abstract

The permeability of reservoirs is a key factor affecting the exploitation and utilization of geothermal resources. This test used a core flow meter and other advanced experimental devices to investigate the evolution of the permeability characteristics of loose sandstone samples (with a diameter of 25 mm and a length of 50 mm) in the Zijiao Town area under various temperatures, confining pressures, injection rates, and cyclic loading and unloading conditions. The results show that (1) as the temperature increases, the overall trend of rock permeability decreases, which is mainly related to the thermal expansion of rock particles. In addition, the higher the temperature, the greater the gravel outflow. (2) The critical pressure for pore closure in the unconsolidated sandstone in the region is approximately 15 MPa. (3) The permeability change of loose sandstone under low injection rate conditions is relatively small and can be neglected. However, there is reason to believe that under high-flow injection conditions, the permeability of this type of rock mass will undergo significant changes. (4) Under the condition of loading and unloading, the permeability ratio curve of the unloading stage at three temperatures is almost a straight line. The higher the temperature, the smaller the slope, and the permeability at 20 °C with the highest recovery degree is only about 50% of the initial one.

Suggested Citation

  • Rui Cui & Bo Feng & Xiaofei Duan & Jichu Zhao & Yabin Yang & Shoutao Feng & Yilong Yuan, 2024. "Analytical Study of Permeability Properties of Loose Sandstone Based on Thermal-Hydraulic-Mechanical (THM) Coupling," Energies, MDPI, vol. 17(2), pages 1-19, January.
    • Handle: RePEc:gam:jeners:v:17:y:2024:i:2:p:327-:d:1315780
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    References listed on IDEAS

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    1. Pan, Shu-Yuan & Gao, Mengyao & Shah, Kinjal J. & Zheng, Jianming & Pei, Si-Lu & Chiang, Pen-Chi, 2019. "Establishment of enhanced geothermal energy utilization plans: Barriers and strategies," Renewable Energy, Elsevier, vol. 132(C), pages 19-32.
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