CO2注入引起井筒周围岩石损伤的热孔弹耦合分析

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Abstract A coupled thermo-poroelastic model is proposed with integration of a damage factor. The proposed thermo-poroelastic model is firstly utilized to simulate the thermo-hydro-mechanical(THM) response of homogeneous elastic medium；and its accuracy of the numerical results is verified through comparing to the decoupled analytical solution. Secondly，the thermo-poroelastic model is employed to predict stress response and damage propagation around the wellbore due to CO2 injection. Finally，this model is applied to heterogeneous rock under a Weibull distribution to predict stress response and permeability change. The experimental results indicate that the supercritical CO2 injection can change the rock?s strength state and permeability distribution significantly. Too high injection rates will facilitate the tensile damage and extend the tensile damage zone. Heterogeneous rock material is more vulnerable to tensile damage and permeability increase.

Key words： rock mechanics CO2 geological storage analytical solution finite element method themo-poroelastic coupling damage propagation wellbore

Received: 21 May 2013

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https://rockmech.whrsm.ac.cn/EN/Y2013/V32/I11/2205

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