The medium and deep geothermal resources in China have the characteristics of wide distribution, large water discharge, and great development potential. However, traditional-style development of geothermal resource has problems such as decreasing formation pressure, insufficient water production, and low development efficiency. Therefore, adhering to the concept of “green cyclic heat extraction and equal-volume same-layer recharge”, this paper explores “the geological engineering integration" pumping-recharging balance development technology for the characteristics of the medium and deep geothermal resource reservoirs, and forms a comprehensive technical sequence including the whole process of resource evaluation and prediction, engineering optimization design, and on-site implementation. Firstly, the finite element COMSOL software is used to construct the pumping and recharging geological model for the dynamic and accurate prediction of re-injection volume. Secondly, according to the geological complexity, the suspended casing and long open hole structure is used to meet the design requirements. Finally, based on the applicable analysis of pumps, by matching and optimizing the flow and head, and using variable frequency speed control to optimize the control system and other methods to achieve efficient water pumping in geothermal wells. In the on-site pumping and recharging test of the Tongzhou project, the maximum water production reaches 116 m3/h, and the maximum recharging volume is 245 m3/h. This technology is helpful for the construction of the “Beijing-Tianjin-Hebei Geothermal Heating Demonstration Base”, and for efficient and sustainable development of geothermal resources, and has useful reference and guiding significance for the development of the same type of geothermal resources in the Beijing-Tianjin-Hebei region.

错误:搜索内容不能为空,请输入英文关键词
错误:关键词超出字数限制,请精简
高级检索

Research on Geothermal Heating Production and Injection Technology in the Beijing-Tianjin-Hebei Region

  • Yun Liu,
  • Ning Luo,
  • Zhi-cheng Yu,
  • Li Guo,
  • Jin-peng Zhang,
  • Yi-fan Li

摘要

The medium and deep geothermal resources in China have the characteristics of wide distribution, large water discharge, and great development potential. However, traditional-style development of geothermal resource has problems such as decreasing formation pressure, insufficient water production, and low development efficiency. Therefore, adhering to the concept of “green cyclic heat extraction and equal-volume same-layer recharge”, this paper explores “the geological engineering integration" pumping-recharging balance development technology for the characteristics of the medium and deep geothermal resource reservoirs, and forms a comprehensive technical sequence including the whole process of resource evaluation and prediction, engineering optimization design, and on-site implementation. Firstly, the finite element COMSOL software is used to construct the pumping and recharging geological model for the dynamic and accurate prediction of re-injection volume. Secondly, according to the geological complexity, the suspended casing and long open hole structure is used to meet the design requirements. Finally, based on the applicable analysis of pumps, by matching and optimizing the flow and head, and using variable frequency speed control to optimize the control system and other methods to achieve efficient water pumping in geothermal wells. In the on-site pumping and recharging test of the Tongzhou project, the maximum water production reaches 116 m3/h, and the maximum recharging volume is 245 m3/h. This technology is helpful for the construction of the “Beijing-Tianjin-Hebei Geothermal Heating Demonstration Base”, and for efficient and sustainable development of geothermal resources, and has useful reference and guiding significance for the development of the same type of geothermal resources in the Beijing-Tianjin-Hebei region.