Volume 41 Issue 2
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WU Zhiqiang, WU Guang’ai, XING Xuesong.Sealing integrity of cement sheath under the condition of CO2 corrosion–stress coupling[J]. Drilling Fluid & Completion Fluid，2024, 41（2）：220-230 doi: 10.12358/j.issn.1001-5620.2024.02.012
Citation: WU Zhiqiang, WU Guang’ai, XING Xuesong.Sealing integrity of cement sheath under the condition of CO2 corrosion–stress coupling[J]. Drilling Fluid & Completion Fluid，2024, 41（2）：220-230 doi: 10.12358/j.issn.1001-5620.2024.02.012
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Sealing Integrity of Cement Sheath under the Condition of CO2 Corrosion–Stress Coupling

doi: 10.12358/j.issn.1001-5620.2024.02.012

  • CNOOC Research Institute Co., Ltd., Beijing 100028

  • Received Date: 2023-10-14
  • Rev Recd Date: 2023-12-01
  • Publish Date: 2024-03-30
    Abstract
  • In geologically sequestrating CO2, the reaction between the CO2 and the water in the confining rocks produces a chemical that causes the cement sheath to corrode, the coupling of the corrosion damage and the pressure (stress) inside the casing string greatly affects the seal integrity of the cement sheath. In CO2 corrosion test, the mechanical parameters of the set cement with different corrosion severities are obtained. The stress-strain behavior of the cement sheath before and after corrosion is described using the concrete damaged plasticity (CDP) constitutive model and the Mohor-Coulomb criterion. Using the ABAQUS software, a finite element analysis model for the wellbore assembly (casing-cement sheath-confining formation rocks) is established taking into account the coupling of CO2 corrosion and stress. The effects of internal pressure of the casing and corrosion time on the integrity of cement sheath are investigated. It is found that at high internal pressure of casing, the cement sheath undergoes elastic-plastic deformation, structural damage is found in the cement sheath, and micro-gaps are easy to be generated in the interfaces between the casing and the cement sheath. The coupled action of corrosion and internal pressure of casing causes the integrity of the cement sheath to fail easily. Compared with the cement sheath that undergoes no corrosion, the cement sheath with corrosion damage after being pressurized has higher radial stress, higher equivalent plastic strain, wider micro-gap and more serious tensile and compressive damages. On the other hand, the plastic radius decreases, and the corrosion time does not significantly affect the micro-gap and the tensile and compressive damage.

     

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