Identification and characterization of dominant seepage channels in oil reservoirs after polymer flooding based on streamline numerical simulation

作者：Kun Yan, Peihui Han, Kun Xie, Lingdong Meng, Weijia Cao, Ruibo Cao, Tong Zhang, Xin Li, Song Li · 发表于：Alexandria Engineering Journal · 年份：2024 · DOI：10.1016/j.aej.2024.08.104 · 被引用次数：9 · 研究领域：Reservoir Engineering and Simulation Methods、Enhanced Oil Recovery Techniques、Hydraulic Fracturing and Reservoir Analysis

Reservoir heterogeneity, water-oil mobility ratio, cementation degree, and strong injection and production significantly influence long-term waterflooding and polymer flooding processes in oil reservoir development, leading to the formation of low-resistance dominant seepage channels in the lower part of thick oil layers without internal laminations. Understanding the spatial distribution and evolution of dominant seepage channels in oil reservoirs during waterflooding and polymer flooding is crucial for improving reservoir development and recovery rates. It uses a streamlined numerical simulation method to quantitatively show the spatial and temporal distribution of dominant seepage channels in the oil reservoir. A model and chart were created to demonstrate the relationship between permeability and throat radius, capturing changes in reservoir permeabilities over time. The study developed a comprehensive mathematical model to identify dominant seepage channels, considering parameters such as inter-well flow ratio, injection efficiency, permeability change value, and water saturation. Research findings indicate a 14.8 % increase in reservoir permeability after polymer flooding, with slight changes in porosity and a 20.3 % decrease in clay content. The established mathematical model and identification criteria were used to comprehensively quantitatively evaluate flow channels, describing the distribution characteristics and evolution process of dominant seepage channels in th...