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Thermal response of the fractured hot dry rocks with thermal-hydro-mechanical coupling effects

Wang, Hongwei ; Liu, Hejuan ; Chen, Dongfang ; Wu, Haidong ; Jin, Xianpeng

Geothermics, 2022-09, Vol.104, p.102464, Article 102464 [Periódico revisado por pares]

Oxford: Elsevier Ltd

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  • Título:
    Thermal response of the fractured hot dry rocks with thermal-hydro-mechanical coupling effects
  • Autor: Wang, Hongwei ; Liu, Hejuan ; Chen, Dongfang ; Wu, Haidong ; Jin, Xianpeng
  • Assuntos: Coupling ; Exact solutions ; Flow rates ; Flow resistance ; Flow velocity ; Fracture density ; Fracture surfaces ; Geothermal energy ; High flow ; Injection ; Injection wells ; Interconnected fractures ; Intersections ; Mathematical models ; Mechanical properties ; Model accuracy ; Parameters ; Pressure ; Project development ; Reservoirs ; Rocks ; Seepage ; Seepage resistance ; Surface roughness ; Temperature ; Thermal response ; Thermal-hydraulic-mechanical (THM) coupling ; Water loss
  • É parte de: Geothermics, 2022-09, Vol.104, p.102464, Article 102464
  • Descrição: •The results show that although the increased vertical stress, fracture surface roughness and intersection angle will increase the flow resistance, the temperature of fracture fluid will rise faster.•On the contrary, the increase of injection pressure will expand the fracture aperture and lead to the temperature of the fracture fluid rises slowly.•In addition, not all fractures contribute to the productivity of the hot dry rocks (HDRs) type of reservoirs, while only the interconnected fractures are effective.•The flow rate of production will increase when fracture density increases under the condition of connecting the injection well and production well, but the production temperature will decrease.•The relative importance of the individual parameter alone is not enough to directly measure the optimal engineering parameters, so considering the impact of multiple parameters comprehensively is crucial for EGS project development and directly affects its commercial viability. In order to efficiently exploit geothermal energy, the reasonable configuration of fracture network should ensure the minimum water loss, high flow rate, high production temperature, and good connectivity between injection wells and production wells. To achieve the above objectives, the operating parameters of the EGS project should be balanced with the reservoir characteristics. In this paper, the THM coupling model is established in the finite element solver, which analyzes the influence of formation stress, injection pressure, roughness of fracture surface, fracture intersection angle, and fracture connectivity on fluid seepage pressure and outlet temperature. The accuracy of the model was verified by comparison to analytical solutions. The results show that although the increased vertical stress, fracture surface roughness and intersection angle will increase the flow resistance, the temperature of fracture fluid will rise faster. On the contrary, the increase of injection pressure will expand the fracture aperture and lead to the temperature of the fracture fluid rises slowly. In addition, not all fractures contribute to the productivity of the hot dry rocks (HDRs) type of reservoirs, while only the interconnected fractures are effective. The flow rate of production will increase when fracture density increases under the condition of connecting the injection well and production well, but the production temperature will decrease. The relative importance of the individual parameter alone is not enough to directly measure the optimal engineering parameters, so considering the impact of multiple parameters comprehensively is crucial for EGS project development and directly affects its commercial viability.
  • Editor: Oxford: Elsevier Ltd
  • Idioma: Inglês
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  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

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