Due to the low permeability of tight reservoirs, throats play a significant role in controlling fluid flow. Although many studies have been conducted to investigate fluid flow in throats in the microscale domain, comparatively fewer works have been devoted to study the effect of adsorption boundary layer (ABL) in throats based on the digital rock method. By considering an ABL, we investigate its effects on fluid flow. We build digital rock model based on computed tomography technology. Then, microscopic pore structures are extracted with watershed segmentation and pore geometries are meshed through Delaunay triangulation approach. Finally, using the meshed digital simulation model and finite element method, we investigate the effects of viscosity and thickness of ABL on microscale flow. Our results demonstrate that viscosity and thickness of ABL are major factors that significantly hinder fluid flow in throats.

由于致密储层的渗透率低，因此喉咙在控制流体流动方面起着重要作用。尽管已经进行了许多研究来研究微尺度域中喉咙中的流体流动，但是基于数字岩石方法，研究喉部中的吸附边界层（ABL）的作用的工作却相对较少。通过考虑ABL，我们研究了其对流体流动的影响。我们基于计算机断层扫描技术建立数字岩石模型。然后，通过分水岭分割提取微观孔隙结构，并通过Delaunay三角剖分方法对孔隙几何形状进行网格划分。最后，使用网格数字仿真模型和有限元方法，研究了ABL的粘度和厚度对微尺度流动的影响。