Mechanics in Engineering ›› 2010, Vol. 32 ›› Issue (4): 30-34.DOI: 10.6052/1000-0879-lxysj2009-457
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Abstract: The leakage after CO_2 sequestration is critical in the evaluation of CO_2 storage period and the stability of the cap-rock. In this paper, the commercial FEM software ABAQUS is used with a secondary development to analyze the key factors of CO_2 seepage. Meanwhile the gas Vander-Walls equation is applied to the supercritical CO_2 compared to the ideal gas equation. A simple theoretical result is obtained and verified in a good agreement with that of simulation. The results show that at least 150 000 years are needed until CO_2 escapes completely from a homogeneous cap-rock with a low permeability; the number storage duration is decreaseds to 10 000 years when there is a high permeability leaky well or fractures, hence, fractures or leaky wells should be consolidated before sequestration or kept away from project areas.
Key words: CO2 geological sequestration, leakage, seepage
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URL: http://lxsj.cstam.org.cn/EN/10.6052/1000-0879-lxysj2009-457
http://lxsj.cstam.org.cn/EN/Y2010/V32/I4/30