Pore-scale characteristics of multiphase flow in heterogeneous porous media using the lattice Boltzmann method
Pore-scale characteristics of multiphase flow in heterogeneous porous media using the lattice Boltzmann method
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DOI：
10.1038/s41598-019-39741-x
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发表时间：
2019-03-04
影响因子：
4.6
通讯作者：
Shokri, Nima
中科院分区：
文献类型：
--
作者：
Bakhshian, Sahar;Hosseini, Seyyed A.;Shokri, Nima
这项研究提供了一个孔隙尺度的调查两相流动力学在一个现实的非均质岩石样品的主要排水。采用格子Boltzmann（LB）方法，对三维非混相驱进行了数值模拟，识别出三种典型的流动模式，并绘制在毛细管数（Ca）-粘度比（M）相图上。然后，我们调查的粘度比和毛细管数的流体饱和度模式和驱替稳定性的塔斯卡卢萨砂岩，这是取自克兰菲尔德网站的效果。研究了饱和度、驱替前缘位置、三维驱替模式和侵入流体质心长度随粘度比和毛管数的变化规律。为了定量地了解三维多孔介质中的侵入形态特征，计算了不同粘度比和毛细管数下排水过程中非润湿相驱替模式的分形维数Df。Df对侵入相饱和度的对数依赖性对于各种毛细管数和粘度比似乎是相同的，并且遵循普遍的关系。
This study provides a pore-scale investigation of two-phase flow dynamics during primary drainage in a realistic heterogeneous rock sample. Using the lattice Boltzmann (LB) method, a series of threedimensional (3D) immiscible displacement simulations are conducted and three typical flow patterns are identified and mapped on the capillary number (Ca)-viscosity ratio(M) phase diagram. We then investigate the effect of the viscosity ratio and capillary number on fluid saturation patterns and displacement stability in Tuscaloosa sandstone, which is taken from the Cranfield site. The dependence of the evolution of saturation, location of the displacement front, 3D displacement patterns and length of the center of mass of the invading fluid on the viscosity ratio and capillary number have been delineated. To gain a quantitative insight into the characteristics of the invasion morphology in 3D porous media, the fractal dimension Df of the non-wetting phase displacement patterns during drainage has been computed for various viscosity ratios and capillary numbers. The logarithmic dependence of Df on invading phase saturation appears to be the same for various capillary numbers and viscosity ratios and follows a universal relation.