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The integrity of the cement sheath is critical in determining the long-term effectiveness of carbon dioxide geologic storage wells. To improve the resistance of cement slurry to degradation under the combined effects of carbon dioxide corrosion and tensile stress, the composite toughening effect of nano-silica and cellulose fibers on mechanical properties, pore permeability, and tensile stress corrosion performance was investigated. Research findings indicate that nano-silica and cellulose fibers, when appropriately dosed, do not adversely affect the engineering performance of cement slurry. Incorporating nano-silica and cellulose fibers effectively enhances the mechanical strength, reduces porosity and permeability, and significantly boosts resistance to tensile stress corrosion in cement slurry. Nano-silica reduces Ca(OH)2 content and enhances nanoscale internal structural density in cement slurry. Cellulose fibers’ unique properties and structure facilitate excellent bonding and enhance macro-scale load-bearing capacity in cement slurry. The synergistic effect of nano-silica and cellulose fibers at nano and macro scales significantly enhances cement slurry's resistance to deterioration.

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The Effect of Multi-scale Composite Toughening on the Degradation Resistance of Cement Slurry Under the Coupling Effect of Tensile Stress and CO2 Corrosion

  • 会议论文

  • 发表日期：

    2025年

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  • Zhong Li,
  • Zhiming Yin,
  • Xingquan Zhang,
  • Zhiqiang Huang,
  • Zhiqiang Wu

摘要

The integrity of the cement sheath is critical in determining the long-term effectiveness of carbon dioxide geologic storage wells. To improve the resistance of cement slurry to degradation under the combined effects of carbon dioxide corrosion and tensile stress, the composite toughening effect of nano-silica and cellulose fibers on mechanical properties, pore permeability, and tensile stress corrosion performance was investigated. Research findings indicate that nano-silica and cellulose fibers, when appropriately dosed, do not adversely affect the engineering performance of cement slurry. Incorporating nano-silica and cellulose fibers effectively enhances the mechanical strength, reduces porosity and permeability, and significantly boosts resistance to tensile stress corrosion in cement slurry. Nano-silica reduces Ca(OH)2 content and enhances nanoscale internal structural density in cement slurry. Cellulose fibers’ unique properties and structure facilitate excellent bonding and enhance macro-scale load-bearing capacity in cement slurry. The synergistic effect of nano-silica and cellulose fibers at nano and macro scales significantly enhances cement slurry's resistance to deterioration.