Mechanical integrity analysis of caprock during the CO2 injection phase

Bin Liu, Tiantian Huang
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Abstract

CO2 geological storage is one of the important means to mitigate the greenhouse effect. The safe underground storage of CO2 largely depends on the mechanical integrity of the caprock. This paper establishes a fluid-solid coupling model for CO2 geological storage to study the changes in pore pressure, vertical displacement, and effective stress in the caprock during the CO2 injection process. Combined with the Mohr-Coulomb criterion, the study determines whether mechanical failure occurs in the caprock. The results indicate that, at the beginning of CO2 injection, significant changes occur in the pore pressure, vertical displacement, and effective stress at the bottom of the caprock near the injection well, which then tend to stabilize; the maximum pore pressure at the bottom of the caprock reaches 36.08 MPa; the caprock near the injection well is considered the most critical area, where the risk of mechanical failure is highest; at the end of CO2 injection, the stress state does not reach the limit, and the caprock remains stable.
二氧化碳注入阶段的盖岩机械完整性分析
二氧化碳地质封存是缓解温室效应的重要手段之一。二氧化碳的地下安全封存在很大程度上取决于毛岩的力学完整性。本文建立了二氧化碳地质封存的流固耦合模型,研究二氧化碳注入过程中毛岩的孔隙压力、垂直位移和有效应力的变化。结合莫尔-库仑准则,该研究确定了毛岩是否会发生机械破坏。结果表明,在二氧化碳注入初期,注入井附近的盖岩底部的孔隙压力、垂直位移和有效应力发生显著变化,随后趋于稳定;盖岩底部的最大孔隙压力达到 36.08 兆帕;注入井附近的盖岩被认为是最关键的区域,发生机械破坏的风险最高;在二氧化碳注入结束时,应力状态没有达到极限,盖岩保持稳定。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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CiteScore
1.20
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