arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2101.08522math.NAcs.NA
收藏

含全张量渗透率薄包裹体的多孔介质渗流模型与离散化

Modelling and discretization of flow in porous media with thin, full-tensor permeability inclusions

Michele Starnoni, Inga Berre, Eirik Keilegavlen, Jan M. Nordbotten

摘要:

当模拟裂缝性储层中的流体流动时,通常将裂缝表示为嵌入宿主介质中的低维包裹体。现有的含薄夹杂物多孔介质中渗流的离散化方法假定夹杂物渗透率张量的主方向与夹杂物取向一致。虽然这种建模假设适用于拉伸断裂,但在断层的情况下可能会失败,其中主滑动面周围的损伤区可能会引入与主断层方向不一致的各向异性。本文介绍了一种广义降维降阶模型,它在包体的离面方向上也保留了全张量渗透率效应。低维物体的流动控制方程通过垂直平均得到。我们提出了一个框架fordiscretization所产生的混合维问题,旨在方便适应现有的模拟工具。我们给出的数值例子表明,当应用于各向异性断层多孔介质时,现有的公式是失败的,并继续显示我们的方法在二维和三维的收敛性

英文摘要:

When modelling fluid flow in fractured reservoirs, it is common to represent the fracturesas lower-dimensional inclusions embedded in the host medium. Existing discretizationsof flow in porous media with thin inclusions assume that the principal directions of theinclusion permeability tensor are aligned with the inclusion orientation. While this mod-elling assumption works well with tensile fractures, it may fail in the context of faults,where the damage zone surrounding the main slip surface may introduce anisotropy thatis not aligned with the main fault orientation. In this paper, we introduce a generalizeddimensional reduced model which preserves full-tensor permeability effects also in theout-of-plane direction of the inclusion. The governing equations of flow for the lower-dimensional objects are obtained through vertical averaging. We present a framework fordiscretization of the resulting mixed-dimensional problem, aimed at easy adaptation ofexisting simulation tools. We give numerical examples that show the failure of existingformulations when applied to anisotropic faulted porous media, and go on to show theconvergence of our method in both 2D and 3D

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑