Volume 43 Issue 5
Oct.  2026
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Article Navigation >  DRILLING FLUID & COMPLETION FLUID  > 2026  >  43(5): 670-679
Liu Huajie, Zhang Yudi, Zhu Rui, et al.Experimental study on secondary-hydration self-healing performance of microcracks in wellbore cement sheaths[J]. Drilling Fluid & Completion Fluid，2026, 43（5）：670-679 doi: 10.12358/j.issn.1001-5620.2026.05.011
Citation: Liu Huajie, Zhang Yudi, Zhu Rui, et al.Experimental study on secondary-hydration self-healing performance of microcracks in wellbore cement sheaths[J]. Drilling Fluid & Completion Fluid，2026, 43（5）：670-679 doi: 10.12358/j.issn.1001-5620.2026.05.011
shu

Experimental Study on Secondary-hydration Self-healing Performance of Microcracks in Wellbore Cement Sheaths

doi: 10.12358/j.issn.1001-5620.2026.05.011
  • 1.

    State Key Laboratory of Deep Oil and Gas, China University of Petroleum (East China), Qingdao, Shandong 266580

  • 2.

    School of Petroleum Engineering, China University of Petroleum (East China), Qingdao, Shandong 266580

  • 3.

    Shandong Key Laboratory of Offshore Oil & Gas and Hydrate Development, Qingdao, Shandong 266580

  • 4.

    Department of Oil and Gas Technology, Perm State Research and Technology University, Perm, Russia 614990

  • Received Date: 2026-04-15
  • Rev Recd Date: 2026-05-20
  • Publish Date: 2026-10-01
    Abstract
  • The sealing integrity of cement sheaths in well cementing is directly related to the operational safety and service life of oil and gas wells. However, complex service conditions can readily induce microcracks, which, if not repaired at an early stage, may lead to corrosive fluid invasion, casing deterioration, and other risks. Existing studies have paid insufficient attention to short-term repair performance and rheological properties. In this paper, Class G high-sulfate-resistant oil well cement was used as the base material, and six latent reactive materials were selected as secondary-hydration self-healing agents. Through single-additive screening and the construction of composite systems, the short-term self-healing effects after 3 and 7 days of curing were investigated in terms of rheological properties, compressive strength, and permeability. The results show that among the single-additive systems, 10% silica fume and 1% sodium silicate exhibit the best repair performance, with strength recovery rates reaching 70.6% and 78.5%, respectively, after 7 d of curing. The composite systems exhibit a significant synergistic effect. Among them, the system containing 20% fly ash and 1% sodium silicate exhibits the best overall performance, with a strength recovery rate of 72.37% and a permeability reduction rate of 60.69% after 7 d of curing, while also offering lower cost and good field applicability. The developed self-healing agent overcomes the limitations of traditional materials, such as slow reaction and high cost, and provides technical support for early-stage wellbore repair in oil and gas wells. It is of great engineering significance for ensuring wellbore integrity, reducing costs, and improving efficiency.

     

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