宋世瀚,高冉,王锐

• 1:中国石化石油勘探开发研究院有限公司

摘要(Abstract)：

封存效率是CO_2地质封存潜力评估中的关键参数。CO_2封存效率主要由CO_2羽流运移规律决定，受黏性力、重力、毛管力等力学机制影响。目前在毛管力对CO_2羽流运移规律和封存效率影响机理方面的研究并不完善。该文基于垂直平衡假定，推导了考虑毛管力的承压咸水层CO_2羽流运移数学模型。模型表明CO_2羽流运移规律由无量纲毛管力数、Bond数、流度比、毛管力-饱和度函数及相对渗透率-饱和度函数共同决定。通过数值模拟求解数学模型，揭示了毛管力对CO_2封存效率的影响机理。结论如下：(1)毛管力与黏性力的相互作用在水平方向上产生气饱和度过渡区，使得CO_2羽流前缘远离注入井，封存效率降低；(2)毛管力与重力的相互作用在垂直方向上产生气饱和度过渡区，使得CO_2上浮速度变慢，CO_2羽流前缘靠近注入井，封存效率提高；(3)在实际项目条件下，毛管力与重力的相互作用占主导，高毛管力下封存效率可达无毛管力情况下的2～4倍。

关键词(KeyWords)： CO_2地质封存;封存效率;羽流运移;量纲分析;毛管力

Abstract:

Keywords:

基金项目(Foundation): 深地国家科技重大专项“油气藏地质体CO2封存状态表征及有效封存量评价研究”(2024ZD1004302);; 中国石化科技攻关项目“咸水层CO_2封存运移规律及调控方法研究”(P23067)

作者(Author): 宋世瀚,高冉,王锐

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