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<p>To enhance the quality and thermal conductivity of geothermal well cement, this study evaluated the suitability of metakaolin (MK) as a low-carbon substitute material for geothermal well cementing applications. Five formulations with MK substitution levels ranging from 0 to 20% (M0-M20) were prepared according to the GB/T 19139–2012 standard. Compressive strength, bond strength, and thermal conductivity were tested following the GB/T 19139–2015 standard (each group tested with at least 4 samples, average values calculated, and standard deviation controlled within 5%). Results indicated that material performance was optimized at 15%&#xa0;MK substitution, showing an 81% increase in bond strength compared to reference samples (after 1&#xa0;day curing), and 10–11% improvements in thermal conductivity and surface temperature, respectively, at 14&#xa0;days aging. Through characterization techniques including hydration kinetics analysis, X-ray diffraction (XRD), thermogravimetric analysis (TGA), mercury intrusion porosimetry (MIP), and scanning electron microscopy/energy-dispersive spectroscopy (SEM/EDS), it was observed that the incorporation of metakaolin reacts with calcium hydroxide (CH) to form secondary calcium silicate hydrate (C–S–H) and calcium–aluminum silicate hydrate (C–A–S–H), thereby filling pores and enhancing the compressive strength, interfacial bond strength, and thermal conductivity of cementite. The application of oil well cement–metakaolin composite materials for shallow geothermal well cementing not only promotes the application of low-carbon materials but also improves the mechanical integrity and thermal energy extraction efficiency of geothermal wells.</p>

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Improvement in Oil Well Cement Performance for Geothermal Well Cementing by Metakaolin as a Low-Carbon Alternative Cementitious Material

  • 期刊论文

  • 发表日期：

    2025年7月4日

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  • Cen Guo,
  • Ming Li,
  • Chi Zhang,
  • Gang Liu,
  • Yongjin Yu,
  • Ping Zhou

摘要

To enhance the quality and thermal conductivity of geothermal well cement, this study evaluated the suitability of metakaolin (MK) as a low-carbon substitute material for geothermal well cementing applications. Five formulations with MK substitution levels ranging from 0 to 20% (M0-M20) were prepared according to the GB/T 19139–2012 standard. Compressive strength, bond strength, and thermal conductivity were tested following the GB/T 19139–2015 standard (each group tested with at least 4 samples, average values calculated, and standard deviation controlled within 5%). Results indicated that material performance was optimized at 15% MK substitution, showing an 81% increase in bond strength compared to reference samples (after 1 day curing), and 10–11% improvements in thermal conductivity and surface temperature, respectively, at 14 days aging. Through characterization techniques including hydration kinetics analysis, X-ray diffraction (XRD), thermogravimetric analysis (TGA), mercury intrusion porosimetry (MIP), and scanning electron microscopy/energy-dispersive spectroscopy (SEM/EDS), it was observed that the incorporation of metakaolin reacts with calcium hydroxide (CH) to form secondary calcium silicate hydrate (C–S–H) and calcium–aluminum silicate hydrate (C–A–S–H), thereby filling pores and enhancing the compressive strength, interfacial bond strength, and thermal conductivity of cementite. The application of oil well cement–metakaolin composite materials for shallow geothermal well cementing not only promotes the application of low-carbon materials but also improves the mechanical integrity and thermal energy extraction efficiency of geothermal wells.