Piri Mohammad, Karpyn Zuleima T
Department of Chemical and Petroleum Engineering, University of Wyoming, Laramie, Wyoming 82071-2000, USA.
Phys Rev E Stat Nonlin Soft Matter Phys. 2007 Jul;76(1 Pt 2):016316. doi: 10.1103/PhysRevE.76.016316. Epub 2007 Jul 31.
This paper presents the implementation of the pore-scale network model described in paper I [see preceding paper, Z. T. Karpyn and M. Piri, Phys. Rev. E 76, 016315 (2007)]. The model is used to estimate flow properties and predict fluid occupancy during two-phase flow displacements in a rough-walled fracture. The fracture's inner structure is available from the reconstruction of x-ray microtomography images of a fractured sandstone core. The model is able to represent mechanisms such as pistonlike displacement, cooperative pore filling, and snapoff. We study the effects of aperture map scales, rate of injection, and gravity on the distribution of phases inside the fracture and present successful predictions of fluid occupancy during primary drainage, imbibition, and secondary drainage. Results were validated rigorously against x-ray microtomography scans obtained from two-phase flow experiments [see Z. T. Karpyn, A. S. Grader, and P. M. Halleck, J. Colloid Interface Sci. 307, 181 (2007)] and showed two-phase fluid structures in agreement with experimental observations.
本文介绍了在论文I [见前文，Z. T. 卡尔平（Z. T. Karpyn）和M. 皮里（M. Piri），《物理评论E》76, 016315 (2007)]中所描述的孔隙尺度网络模型的实现。该模型用于估计粗糙壁面裂缝中两相流驱替过程中的流动特性并预测流体占有率。裂缝的内部结构可通过对一块破裂砂岩岩心的X射线显微断层扫描图像进行重建获得。该模型能够描述诸如活塞状驱替、协同孔隙填充和液桥断裂等机制。我们研究了孔径图尺度、注入速率和重力对裂缝内部相分布的影响，并给出了初次排水、吸渗和二次排水过程中流体占有率的成功预测。结果与从两相流实验获得的X射线显微断层扫描结果[见Z. T. 卡尔平、A. S. 格雷德（A. S. Grader）和P. M. 哈勒克（P. M. Halleck），《胶体与界面科学杂志》307, 181 (2007)]进行了严格验证，显示出两相流体结构与实验观测结果一致。
