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Abstract

Summary

This study investigates the impact of temperature variations on cement integrity in injection wells using a coupled thermal-hydraulic-mechanical (THM) simulation approach. A 3D finite element model was developed to simulate casing-cement and cement-rock interfaces under thermal loading during cold CO injection. Two cases were analyzed: one with a well-cemented annulus and another with defects. The results reveal that thermal loading significantly influences debonding behavior. In defect-free cases, the cement-rock (CR) interface fully closes, and debonding shifts to the casing-cement (CC) interface. However, when defects are present, both interfaces remain open, with greater debonding at the CR interface. Gap flux analysis shows that poorly cemented sections can positively contribute to overall cement integrity in the well-cemented regions.

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/content/papers/10.3997/2214-4609.202522090
2025-09-01
2026-02-16
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References

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