Insights into the Microscopic Oil-Water Flow Characteristics and Displacement Mechanisms during Waterflooding in Sandstone Reservoir Rock Based on Micro-CT Technology: A Pore-Scale Numerical Simulation Study

• Published in: Materials Vol. 16; no. 9; p. 3555
• Main Authors: Hu, Bingtao, Chai, Guoliang, Liu, Xingjun, Wen, Xiaofeng, Gu, Zhaolin, Xie, Liaobo, Han, Shifeng, Su, Junwei
• Format: Journal Article
• Language: English
• Published: Switzerland MDPI AG 06.05.2023; MDPI
• Subjects: Capillarity; Crude oil; Direct numerical simulation; Displacement; Energy consumption; Enhanced oil recovery; Flow characteristics; Geometry; Investigations; Medical imaging; micro-CT technology; microscopic numerical simulation; Numerical analysis; Oil fields; Oil recovery; Petroleum mining; Petroleum production; Petroleum products; porous materials; Porous media; porous media flow; Sandstone; Seepage; Simulation; Simulation methods; Viscosity ratio; Water flooding; Water flow; Water injection; waterflooding; Wettability; United Kingdom; waterflooding; porous materials; micro-CT technology; microscopic numerical simulation; porous media flow
• ISSN: 1996-1944; 1996-1944
• DOI: 10.3390/ma16093555

The low oil recovery rate observed in current oil fields is largely attributed to the presence of remaining oil trapped in the pores of porous media during waterflooding. To improve the recovery rate, it is imperative to gain an understanding of the oil-water flow characteristics and displacement mechanisms during waterflooding, as well as to elucidate the underlying mobilization mechanisms of residual oil at the pore scale. In this paper, we explore these issues in depth by numerically investigating the influence of factors such as water injection velocities, oil-water viscosity ratios, and wettability conditions on pore-scale oil-water flow characteristics and oil recovery rate. To this end, we employ a direct numerical simulation (DNS) method in conjunction with the volume of fluid (VOF) method to study the microscopic displacement mechanisms of waterflooding in a reconstructed two-dimensional digital rock core based on micro-CT technology. In addition, the particle tracing method is adopted to identify the flow path and dominant areas during waterflooding in order to mobilize the residual oil within the pores. The findings indicate that the oil-water flow characteristics in porous media are determined by the interplay between capillary and viscous forces. Furthermore, the oil recovery rate is 10.6% and 24.7% lower under strong water-wet and oil-wet conditions than that (32.36%) under intermediate wettability conditions, and the final oil recovery rate is higher under water-wet conditions than under oil-wet conditions. The seepage path and the dominant areas are directly linked to the capillarity formed during waterflooding. The findings of this study are significant in terms of enhancing the recovery rate of residual oil and provide a novel perspective for understanding the waterflooding process.