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Semi-analytical model for a geothermal system considering the effect of areal flow between dipole wells on heat extraction

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  • Wu, Bisheng
  • Zhang, Guangqing
  • Zhang, Xi
  • Jeffrey, Robert G.
  • Kear, James
  • Zhao, Tongtiegang

Abstract

Optimization of well placement in a geothermal system is an important topic for maximizing the heat economically extracted from a conductive geothermal reservoir. In order to investigate the role of well placement, this paper presents a semi-analytical model in which fluid circulates in a single, horizontally planar geothermal reservoir with a constant hydraulic aperture via dipole wells in the presence of a 2D areal or regional flow field. By using a new coordinate system based on the velocity potential and the streamline function, analytical solutions in the Laplace space for the temperature field are found, which are then numerically inverted to obtain time-domain results. The effects of some factors such as well separation, areal flow direction, flow rate, and the velocity of the areal flow on heat recovery are investigated. It is found that the dimensionless areal flow velocity, U0 = v0ωπL/Q, and the angle of the areal flow, β, play an important role when changing other parameter to maximize the output temperature and the lifetime of the dipole well system. When U0 ≤ 0.5, the angle for minimizing interflow between wells should be β = 0; when 0.5 < U0 < 0.7854, the angle for minimizing the interflow should be β = arccos(0.5U0); when U0 > 0.7854, the injection well should be placed downstream from the production well.

Suggested Citation

  • Wu, Bisheng & Zhang, Guangqing & Zhang, Xi & Jeffrey, Robert G. & Kear, James & Zhao, Tongtiegang, 2017. "Semi-analytical model for a geothermal system considering the effect of areal flow between dipole wells on heat extraction," Energy, Elsevier, vol. 138(C), pages 290-305.
  • Handle: RePEc:eee:energy:v:138:y:2017:i:c:p:290-305
    DOI: 10.1016/j.energy.2017.07.043
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    References listed on IDEAS

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    Cited by:

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    2. Gkousis, Spiros & Thomassen, Gwenny & Welkenhuysen, Kris & Compernolle, Tine, 2022. "Dynamic life cycle assessment of geothermal heat production from medium enthalpy hydrothermal resources," Applied Energy, Elsevier, vol. 328(C).
    3. El Hage, Hicham & Herez, Amal & Ramadan, Mohamad & Bazzi, Hassan & Khaled, Mahmoud, 2018. "An investigation on solar drying: A review with economic and environmental assessment," Energy, Elsevier, vol. 157(C), pages 815-829.
    4. Salimzadeh, Saeed & Nick, Hamidreza M. & Zimmerman, R.W., 2018. "Thermoporoelastic effects during heat extraction from low-permeability reservoirs," Energy, Elsevier, vol. 142(C), pages 546-558.
    5. Gao, Xiang & Li, Tailu, 2022. "Synergetic characteristics of three-dimensional transient heat transfer in geothermal reservoir combined with power conversion for enhanced geothermal system," Renewable Energy, Elsevier, vol. 192(C), pages 216-230.
    6. Chi Yao & Yulong Shao & Jianhua Yang, 2018. "Numerical Investigation on the Influence of Areal Flow on EGS Thermal Exploitation Based on the 3-D T-H Single Fracture Model," Energies, MDPI, vol. 11(11), pages 1-19, November.

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