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Comparative Analysis of Heating Efficiency of a Single-Well Geothermal System in the Cold Region of Northeast China

Author

Listed:
  • Bo Feng

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

  • Hao Ren

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

  • Zhenpeng Cui

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

Abstract

Geothermal energy is a type of renewable energy that has rich reserves, is clean, environmentally friendly and has been widely used in the heating industry. The single-well closed-loop geothermal system is a technology with the characteristics of “taking heat without taking water” and is mainly used for geothermal energy heating. Although the heating requirements in the cold region of Northeast China are urgent, the traditional heating mode not only has high economic costs but also causes serious damage to the environment. Therefore, it is of important practical significance to change the heating structure and develop and utilize geothermal energy for heating according to local conditions. In this study, the actual operating single-well geothermal system in the Songyuan area of Jilin Province is used as a case study, and a numerical model is established based on the T2WELL simulation program. The flow production temperature and heat extraction response law of the single-well system in the M1 and M2 wells are contrasted and analyzed under the three key factors of geothermal gradient and injection temperature and flow rate. Based on the simulation results, an optimized development and utilization plan for the M1 and M2 wells is proposed. These results provide a theoretical reference and heating potential evaluation for the promotion of single-well geothermal systems in Northeast China. Taking the geothermal gradient of 4.2 ° C/hm as an example, after 30 years of operation, the heat extraction of the M1 well is 406 kW, and that of the M2 well is 589 kW. Compared with the M1 well, although the M2 well has higher heat extraction, the radial variation in reservoir temperature is more than 50 m under long-term operation, which is not conducive to long-term development and utilization.

Suggested Citation

  • Bo Feng & Hao Ren & Yabin Yang & Zhenpeng Cui & Jichu Zhao, 2023. "Comparative Analysis of Heating Efficiency of a Single-Well Geothermal System in the Cold Region of Northeast China," Energies, MDPI, vol. 16(4), pages 1-16, February.
    • Handle: RePEc:gam:jeners:v:16:y:2023:i:4:p:1884-:d:1067879
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    References listed on IDEAS

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