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Finite-volume simulation of capillary-dominated flow in matrix-fracture systems using interface conditions
Computational Geosciences ( IF 2.5 ) Pub Date : 2020-07-18 , DOI: 10.1007/s10596-020-09982-1
Ammar H. Alali , François P. Hamon , Bradley T. Mallison , Hamdi A. Tchelepi

In numerical simulations of multiphase flow and transport in fractured porous media, the estimation of the hydrocarbon recovery requires accurately predicting the capillary-driven imbibition rate of the wetting phase initially present in the fracture into the low-permeability matrix. In the fully implicit finite-volume scheme, this entails a robust methodology that captures the capillary flux at the interface between the matrix and the fracture even when very coarse cells are used to discretize the matrix. Here, we investigate the application of discrete interface conditions at the matrix-fracture interface to improve the accuracy of the flux computation without relying on extreme grid refinement. In particular, we study the interaction of the upwinding scheme with the discrete interface conditions. Considering first capillary-dominated spontaneous imbibition and then forced imbibition with viscous, buoyancy, and capillary forces, we illustrate the importance of the interface conditions to accurately capture the matrix-fracture flux and correctly represent the flow dynamics in the problem.



中文翻译:

利用界面条件有限体积模拟基质裂缝系统中以毛细管为主的流动

在压裂多孔介质中多相流动和输运的数值模拟中,碳氢化合物采收率的估算需要准确地预测最初存在于裂缝中的渗透相到低渗透性基质中的毛细管驱动吸水率。在完全隐式有限体积方案中,这需要一种鲁棒的方法,即使使用非常粗糙的单元来离散化基质,也可以捕获基质与裂缝之间界面处的毛细管通量。在这里,我们研究在矩阵-断裂界面处离散界面条件的应用,以提高通量计算的准确性,而无需依赖极端的网格细化。特别是,我们研究了上风方案与离散界面条件的相互作用。

更新日期:2020-07-18
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