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Geothermal exploitation from hot dry rocks via recycling heat transmission fluid in a horizontal well

Author

Listed:
  • Cui, Guodong
  • Ren, Shaoran
  • Zhang, Liang
  • Ezekiel, Justin
  • Enechukwu, Chioma
  • Wang, Yi
  • Zhang, Rui

Abstract

A new method for geothermal exploitation from hot dry rocks by recycling heat transmission fluid in a horizontal well via a closed loop is proposed, in which the costly and complex hydro-fracturing can be avoided. In this paper, numerical simulation models were established to calculate the heat mining rate for the new technology to assess its technical and economic feasibility. Sensitivity studies were performed to analyze the effects of various parameters on heat mining rate, including the injection rate, the horizontal segment length and the thermal conductivity of the tubing. The results show that a high heat mining rate over 1.7 MW can be obtained using a 3000 m long horizontal well to extract geothermal energy from a typical hot dry rock of 235 °C with a water circulation rate of 432 m3/d. For low-temperature geothermal reservoirs, higher injection rate, longer horizontal wells and better thermal insulation of tubing can be applied to increase the heat mining rate. The cost of geothermal power generation using a single horizontal well is estimated as 0.122 $/kWh, and this could be further reduced to 0.084 $/kWh when the multi-branch horizontal well pattern was adopted, slightly lower than a fractured vertical well case.

Suggested Citation

  • Cui, Guodong & Ren, Shaoran & Zhang, Liang & Ezekiel, Justin & Enechukwu, Chioma & Wang, Yi & Zhang, Rui, 2017. "Geothermal exploitation from hot dry rocks via recycling heat transmission fluid in a horizontal well," Energy, Elsevier, vol. 128(C), pages 366-377.
    • Handle: RePEc:eee:energy:v:128:y:2017:i:c:p:366-377
    DOI: 10.1016/j.energy.2017.04.027
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    References listed on IDEAS

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