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Study on Unblocking and Permeability Enhancement Technology with Rotary Water Jet for Low Recharge Efficiency Wells in Sandstone Geothermal Reservoirs

Author

Listed:
  • Chao Yu

    (State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum-Beijing, Beijing 102249, China)

  • Tian Tian

    (Engineering Research Institute, Sinopec Shanghai Offshore Oil & Gas Company, Shanghai 200120, China)

  • Chengyu Hui

    (State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum-Beijing, Beijing 102249, China)

  • Haochen Huang

    (State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum-Beijing, Beijing 102249, China)

  • Yiqun Zhang

    (State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum-Beijing, Beijing 102249, China)

Abstract

In China, sandstone geothermal reservoirs are large in scale and widely distributed, but their exploitation is hindered by low recharge efficiency. In this paper, an unblocking and permeability enhancement technology using a rotary water jet for low recharge efficiency wells in sandstone geothermal reservoirs is proposed to solve this problem. This paper presents a series of studies about the proposed technology, including experiments, simulation and field application. Firstly, an experiment was carried out to verify the scale removal effect of a high-pressure water jet on the inner wall of the screen tube and its impact on sandstone. Secondly, the numerical models of the rotary jet flow field in the wellbore were established by ANSYS Fluent to study the influence of parameters. Finally, based on the simulation and experiment results, a rotary jet tool applicable to unblocking and descaling low-efficiency wells was designed, and a field application for low-efficiency wells in sandstone thermal reservoirs was conducted. The study results show that the unblocking and permeability enhancement technology using a rotary water jet is effective in removing the blockages and improving the permeability near the well. In conclusion, the presented technology can solve the problem of low efficiency during the reinjection of cooled thermal waters back into sandstone geothermal reservoirs and has great effectiveness in field application.

Suggested Citation

  • Chao Yu & Tian Tian & Chengyu Hui & Haochen Huang & Yiqun Zhang, 2022. "Study on Unblocking and Permeability Enhancement Technology with Rotary Water Jet for Low Recharge Efficiency Wells in Sandstone Geothermal Reservoirs," Energies, MDPI, vol. 15(24), pages 1-21, December.
    • Handle: RePEc:gam:jeners:v:15:y:2022:i:24:p:9407-:d:1001212
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    References listed on IDEAS

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    2. Hou, Jianchao & Cao, Mengchao & Liu, Pingkuo, 2018. "Development and utilization of geothermal energy in China: Current practices and future strategies," Renewable Energy, Elsevier, vol. 125(C), pages 401-412.
    3. Lund, John W., 1997. "Direct heat utilization of geothermal resources," Renewable Energy, Elsevier, vol. 10(2), pages 403-408.
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