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Volume 10 Issue 2
Jun.  2022
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Sun Y K, Liu F, Wang H J, et al. 2022. Numerical simulation of operation performance on production and injection of a double well geothermal system in Kailu Basin, Inner Mongolia. Journal of Groundwater Science and Engineering, 10(2): 196-208 doi:  10.19637/j.cnki.2305-7068.2022.02.008
Citation: Sun Y K, Liu F, Wang H J, et al. 2022. Numerical simulation of operation performance on production and injection of a double well geothermal system in Kailu Basin, Inner Mongolia. Journal of Groundwater Science and Engineering, 10(2): 196-208 doi:  10.19637/j.cnki.2305-7068.2022.02.008

Numerical simulation of operation performance on production and injection of a double well geothermal system in Kailu Basin, Inner Mongolia

doi: 10.19637/j.cnki.2305-7068.2022.02.008
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  • Corresponding author: huajunwang@126.com
  • Received Date: 2022-03-20
  • Accepted Date: 2022-04-30
  • Publish Date: 2022-06-20
  • Inner Mongolia is abundant in geothermal resources, but the development and utilization of medium-depth geothermal resources for clean heating in winter is still in the preliminary stage compared with the neighboring provinces. In this paper, a recently developed geothermal heating system using the Mesozoic sandstone reservoirs in Baokang of Kailu Basin, Eastern Inner Mongolia was investigated, a three-dimensional geological model of a pair of production and injection well was established, and numerical simulations on the long term operation performance were conducted and verified by pumping test and water level recovery test data. The effects of flow rates, the direction of wells, injection temperature and ratios on the flow field and water level in the thermal reservoir were analyzed. The results show that considering a 30-year operation period and a production rate from 90 m3/h to 110 m3/h, the optimum well spacing can be increased from 225 m to 245 m, with an average value of 235 m. With the decrease of the injection temperature, the cold front of the injection water has an increasing influence on the temperature in the production well. A complete injection or the principle of production according to injection is recommended in order to maintain the long-term operation stability. In addition, the location of the injection well should be arranged in the downstream of the natural flow field. The present results can provide a useful guide for the optimum design and performance prediction of geothermal wells, thus maintaining the production and injection balance and promoting the sustainable development and utilization of medium-depth and deep geothermal resources.
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