This article takes the shallow geothermal project of Dagang Oilfield Research Institute as an example to address issues such as loose underground rock and soil, distribution of saline groundwater, and lack of reference experience in shallow geothermal drilling process parameters. Researchers conducted thermal property tests in the implementation area, with a total of 4 exploration holes. Through the tests, parameters such as effective heat transfer coefficient, average thermal conductivity of rock and soil, and initial temperature of the formation were obtained, scientifically evaluating the resource of shallow geothermal energy. Using OGS simulation to predict the temperature changes of geothermal energy fluids, the initial investment of the ground source heat pump system using the dual U heat exchanger type is not higher than that of the single U type, and it can save land area, which is conducive to long-term heat exchange and provides a basis for rational optimization of the scheme. After the implementation of the project, the inlet water temperature of the buried pipe is 7 °C and the outlet water temperature is 12 °C, saving an annual operating cost of 1.3 million yuan and reducing carbon dioxide emissions by 1303 tons per year. This has demonstrative significance for the development of shallow geothermal energy in the region.

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Shallow Geothermal Research and Application of Dagang Oilfield Research Institute

  • Yang Zhao,
  • Yu-wen Zhao,
  • Wen-guang Duan,
  • Shi-feng Hu,
  • Min-min Xia,
  • Ping Zhang,
  • Chao Ma

摘要

This article takes the shallow geothermal project of Dagang Oilfield Research Institute as an example to address issues such as loose underground rock and soil, distribution of saline groundwater, and lack of reference experience in shallow geothermal drilling process parameters. Researchers conducted thermal property tests in the implementation area, with a total of 4 exploration holes. Through the tests, parameters such as effective heat transfer coefficient, average thermal conductivity of rock and soil, and initial temperature of the formation were obtained, scientifically evaluating the resource of shallow geothermal energy. Using OGS simulation to predict the temperature changes of geothermal energy fluids, the initial investment of the ground source heat pump system using the dual U heat exchanger type is not higher than that of the single U type, and it can save land area, which is conducive to long-term heat exchange and provides a basis for rational optimization of the scheme. After the implementation of the project, the inlet water temperature of the buried pipe is 7 °C and the outlet water temperature is 12 °C, saving an annual operating cost of 1.3 million yuan and reducing carbon dioxide emissions by 1303 tons per year. This has demonstrative significance for the development of shallow geothermal energy in the region.