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首页> 外文期刊>Transport in Porous Media >Coupled Electrokinetic–Hydromechanic Model for text{ CO}_{2} Sequestration in Porous Media
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Coupled Electrokinetic–Hydromechanic Model for text{ CO}_{2} Sequestration in Porous Media

机译：文本{CO} _ {2}在多孔介质中的螯合的电动-液压耦合模型

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摘要

In this paper, a computational model for the simulation of coupled electrokinetic and hydromechanical flow in a multiphase domain is introduced. Particular emphasis is placed on modeling (text{ CO}_{2}) flow in a deformed, unsaturated geologic formation and its associated streaming potential. The governing field equations are derived based on the averaging theory and solved numerically based on a mixed discretization scheme. The standard Galerkin finite element method is utilized to discretize the deformation and the diffusive dominant field equations, and the extended finite element method, together with the level-set method, is utilized to discretize the advective dominant field equations. The level-set method is employed to trace the (text{ CO}_{2}) plume front, and the extended finite element method is employed to model the high gradient in the saturation field front. This mixed discretization scheme leads to a highly convergent system, giving a stable and effectively mesh-independent model; furthermore, it minimizes the number of degrees of freedom, making the numerical scheme computationally efficient. The capability of the proposed model is evaluated by verification and numerical examples. Effects of the formation stiffness on the (text{ CO}_{2}) flow and the salinity content on the streaming potential are discussed.
机译：本文介绍了一种用于模拟多相域中的电动与液力耦合流动的计算模型。特别强调的是对变形的非饱和地质构造中的流动（文本{CO} _ {2}）进行建模及其相关的流动潜力。根据平均理论推导控制场方程，并基于混合离散化方案进行数值求解。标准的Galerkin有限元方法用于离散变形和扩散主场方程，扩展的有限元方法与水平集方法一起用于离散对流主场方程。水平集方法用于跟踪（text {CO} _ {2}）羽流前沿，而扩展有限元方法则用于对饱和场前沿的高梯度进行建模。这种混合离散方案导致系统高度收敛，从而提供了稳定且有效的网格无关模型；此外，它使自由度的数量最小化，从而使数值方案在计算上有效。通过验证和算例评估了所提出模型的能力。讨论了地层刚度对（text {CO} _ {2}）流和盐度含量对流势的影响。

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