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Experimental Study on the Heat Exchange Mechanism in a Simulated Self-Circulation Wellbore

Author

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  • Liang Zhang

    (School of Petroleum Engineering, China University of Petroleum (East China), Qingdao 266580, China
    Key Laboratory of Unconventional Oil & Gas Development, China University of Petroleum (East China), Ministry of Education, Qingdao 266580, China)

  • Songhe Geng

    (School of Petroleum Engineering, China University of Petroleum (East China), Qingdao 266580, China
    Key Laboratory of Unconventional Oil & Gas Development, China University of Petroleum (East China), Ministry of Education, Qingdao 266580, China)

  • Jun Kang

    (School of Petroleum Engineering, China University of Petroleum (East China), Qingdao 266580, China
    Key Laboratory of Unconventional Oil & Gas Development, China University of Petroleum (East China), Ministry of Education, Qingdao 266580, China)

  • Jiahao Chao

    (School of Petroleum Engineering, China University of Petroleum (East China), Qingdao 266580, China
    Key Laboratory of Unconventional Oil & Gas Development, China University of Petroleum (East China), Ministry of Education, Qingdao 266580, China)

  • Linchao Yang

    (School of Petroleum Engineering, China University of Petroleum (East China), Qingdao 266580, China
    Key Laboratory of Unconventional Oil & Gas Development, China University of Petroleum (East China), Ministry of Education, Qingdao 266580, China)

  • Fangping Yan

    (Department of Petroleum Engineering, Chengde Petroleum College, Chengde 067000, China)

Abstract

Self-circulation wellbore is a new technique for geothermal development in hot dry rocks (HDR), which uses a U-shape channel composed of tubing and casing as the heat exchanger. In this study, a self-circulation wellbore in HDR on a laboratory scale was built, and a serial of experiments were conducted to investigate the heat exchange law and the influencing factors on the heat mining rate of the wellbore. A similarity analysis was also made to estimate the heat-mining capacity of the wellbore on a field scale. The experimental results show that the large thermal conductivity and heat capacity of granite with high temperature can contribute to a large heat-mining rate. A high injection rate can cause a high convective heat transfer coefficient in wellbore, while a balance is needed between the heat mining rate and the outlet temperature. An inner tubing with low thermal conductivity can significantly reduce the heat loss to the casing annulus. The similarity analysis indicates that a heat mining rate of 1.25 MW can be reached when using a 2000 m long horizontal well section in a 150 °C HDR reservoir with a circulation rate of 602.8 m 3 /day. This result is well corresponding to the published data.

Suggested Citation

  • Liang Zhang & Songhe Geng & Jun Kang & Jiahao Chao & Linchao Yang & Fangping Yan, 2020. "Experimental Study on the Heat Exchange Mechanism in a Simulated Self-Circulation Wellbore," Energies, MDPI, vol. 13(11), pages 1-22, June.
    • Handle: RePEc:gam:jeners:v:13:y:2020:i:11:p:2918-:d:368230
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    References listed on IDEAS

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    Cited by:

    1. Zhang, Liang & Yang, Linchao & Geng, Songhe & Wen, Ronghua & He, Chuan & Liang, Yuzhu & Yang, Hongbin, 2022. "Numerical simulation on the heat extraction from the porous medium-low temperature geothermal reservoirs by self-circulation wellbore and its enhanced methods," Renewable Energy, Elsevier, vol. 194(C), pages 1009-1025.
    2. Hu, Xincheng & Banks, Jonathan & Guo, Yunting & Liu, Wei Victor, 2021. "Retrofitting abandoned petroleum wells as doublet deep borehole heat exchangers for geothermal energy production—a numerical investigation," Renewable Energy, Elsevier, vol. 176(C), pages 115-134.

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