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<p>During the exploitation of high-temperature hydrothermal geothermal reservoirs, rocks are often exposed to subcritical water environment for extended periods, which accelerates rock corrosion damage, compromising reservoir stability and the safety of geothermal energy extraction. To investigate the hydrothermal corrosion effects of subcritical water on geothermal reservoirs, this study simulated water-sandstone interactions under subcritical water environment. Elemental dissolution and pore structure evolution were analyzed using inductively coupled plasma mass spectrometer (ICP-MS) and nuclear magnetic resonance (NMR) techniques to evaluate the influence of thermal and fatigue effects on sandstone corrosion damage. The results indicate that Si, a key rock-forming element in sandstone minerals, exhibits a linear positive correlation between its dissolution rate and interaction temperature, with metal elements peaking between 250℃ and 300℃. Under hydrothermal corrosion, changes in the physical properties of water enhance the release of rock-forming elements, which promotes pore development. With microporous propagation, the mesopore porosity increases by 105.75%, 129.47%, and 138.14% after 1, 5, and 10 interactions at 250℃ compared to 25℃. Analysis of the hydrothermal corrosion damage model reveals that the 1 ~ 5 interaction cycle period constituted the primary stage of damage accumulation. These findings provide a foundation for ensuring the long-term stability and safety of geothermal reservoirs.</p>

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Study on hydrothermal corrosion effects of sandstone in subcritical water environment

  • 期刊论文

  • 发表日期：

    2025年11月20日

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  • Shutao Zhou,
  • Qiang Sun,
  • Jianjun Hu,
  • Jishi Geng,
  • Huiting Zhang,
  • Mingbo Chi,
  • Ersheng Zha

摘要

During the exploitation of high-temperature hydrothermal geothermal reservoirs, rocks are often exposed to subcritical water environment for extended periods, which accelerates rock corrosion damage, compromising reservoir stability and the safety of geothermal energy extraction. To investigate the hydrothermal corrosion effects of subcritical water on geothermal reservoirs, this study simulated water-sandstone interactions under subcritical water environment. Elemental dissolution and pore structure evolution were analyzed using inductively coupled plasma mass spectrometer (ICP-MS) and nuclear magnetic resonance (NMR) techniques to evaluate the influence of thermal and fatigue effects on sandstone corrosion damage. The results indicate that Si, a key rock-forming element in sandstone minerals, exhibits a linear positive correlation between its dissolution rate and interaction temperature, with metal elements peaking between 250℃ and 300℃. Under hydrothermal corrosion, changes in the physical properties of water enhance the release of rock-forming elements, which promotes pore development. With microporous propagation, the mesopore porosity increases by 105.75%, 129.47%, and 138.14% after 1, 5, and 10 interactions at 250℃ compared to 25℃. Analysis of the hydrothermal corrosion damage model reveals that the 1 ~ 5 interaction cycle period constituted the primary stage of damage accumulation. These findings provide a foundation for ensuring the long-term stability and safety of geothermal reservoirs.