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Numerical simulation on Geothermal extraction by radial well assisted hydraulic fracturing

Author

Listed:
  • Guo, Tiankui
  • Hao, Tong
  • Chen, Ming
  • Zhang, Yuelong
  • Qu, Zhanqing
  • Jia, Xuliang
  • Zhang, Wei
  • Yu, Haiyang

Abstract

The mid-deep geothermal energy is extracted from the fracture network created by hydraulic fracturing. Generally, the hydraulic fracture created in the deep thermal reservoir shows the planar shape but not the network shape, and this significantly impacts the geothermal extraction efficiency. In this study, a geothermal extraction technology by radial well assisted hydraulic fracturing, which connects hydraulic fractures to each other, was proposed. An operation technique of radial well-assisted hydraulic fracturing in geothermal reservoirs without well-developed NFs was established. The model considering evolution of fracture permeability was resolved by thermo-hydromechanical (THM) coupling numerical simulation. The results show that the radial wells should be placed vertically within a large range. The thermal production increases by 20%, about 0.25 MW as the radial well length increases from 50 m to 200 m. As many fractures as possible are needed in thermal exploitation, and the fracture number should be at least 7. The simulation demonstrates that the radial well-assisted hydraulic fracturing heat recovery method is feasible in simulation. In this thesis, a more accurate numerical simulation method of geothermal production capacity is proposed, which has engineering guiding significance for the actual development and prediction of geothermal energy.

Suggested Citation

  • Guo, Tiankui & Hao, Tong & Chen, Ming & Zhang, Yuelong & Qu, Zhanqing & Jia, Xuliang & Zhang, Wei & Yu, Haiyang, 2023. "Numerical simulation on Geothermal extraction by radial well assisted hydraulic fracturing," Renewable Energy, Elsevier, vol. 210(C), pages 440-450.
    • Handle: RePEc:eee:renene:v:210:y:2023:i:c:p:440-450
    DOI: 10.1016/j.renene.2023.04.085
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    References listed on IDEAS

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