Volume 43 Issue 2
Apr.  2026
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CAO Hongchang, DANG Donghong, ZHANG Ye, et al.The influence of calcium-based whisker self-healing agent on self-healing of oil well set cement cracks in CCUS wells[J]. Drilling Fluid & Completion Fluid，2026, 43（2）：209-216 doi: 10.12358/j.issn.1001-5620.2026.02.009
Citation: CAO Hongchang, DANG Donghong, ZHANG Ye, et al.The influence of calcium-based whisker self-healing agent on self-healing of oil well set cement cracks in CCUS wells[J]. Drilling Fluid & Completion Fluid，2026, 43（2）：209-216 doi: 10.12358/j.issn.1001-5620.2026.02.009
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The Influence of Calcium-Based Whisker Self-Healing Agent on Self-Healing of Oil Well Set Cement Cracks in CCUS Wells

doi: 10.12358/j.issn.1001-5620.2026.02.009
  • 1.

    Engineer Technology Research Institute, BHDC, Tianjin 300457

  • 2.

    No.1 Cementing company, BHDC, Renqiu, Hebei 062552

  • Received Date: 2025-10-12
  • Rev Recd Date: 2025-11-28
  • Publish Date: 2026-04-08
    Abstract
  • In wells for carbon capture, utilization and storage (CCUS), cement sheaths are easy to get chemically damaged, hence reducing their service life. A study was conducted to enhance the self-healing capacity of cement sheaths by reacting calcium-based whisker self-healing agent with CO2 to produce CaCO3. The influence of calcium-based whisker self-healing agent on the self-healing process of cement sheaths was studied using mechanical tester, X-ray diffractometer (XRD), thermogravimetric analyzer (TGA), scanning electron microscope (SEM) and industrial computed tomography (CT) etc. The results of mechanical performance tests showed that after 28 days of self-healing, the self-healing rate of the compressive strength of the set cement incorporated with the calcium-based whisker reached 83.87%, which is 90.31% higher than that of the set cement without incorporating calcium-based whisker. Phase analysis and SEM observation results show that a large number of calcite-type calcium carbonate crystals were generated around the self-healing material and deposited in the cracks of the set cement, thereby rendering the cracks in the set cement carbonized self-healing. CT test results further confirmed the self-healing effect of the calcium-based whisker self-healing agent; after 28 days of self-healing, the volume of the cracks in the set cement incorporated with the calcium-based whisker self-healing agent was reduced by 4,165.95 mm3, a self-healing rate of 72.32%. This indicates that in the CCUS well environment, the incorporation of calcium-based whisker self-healing materials into a cement slurry has a positive impact on the carbonized self-healing process of the cement sheath.

     

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