Gel particle profile modification and flooding is one of the main technical methods for stabilizing oil, water control, and production cycle prolonging in the oil field. Quantitative evaluation of the plugging effect of the displacement agent on pores of different sizes under various conditions may provide useful guidance for field development. In this study, nuclear magnetic resonance technology and dynamic physical simulation experiments were used to quantitatively evaluate the plugging effect of pore spaces at different scales. The influence of permeability, temperature, injection pressure, injection volume, and formation water salinity on plugging effect was also investigated. The results show that the poly(ethylene glycol) (PEG)-1 gel particle system flooding agent can effectively plug pore spaces at different scales. For artificial cores, the plugging dimension was between 0.10 and 59.95 ms, and for natural cores, the plugging dimension was between 0.10 and 1144.64 ms. The plugging effect of gel particles was negatively correlated with permeability and salinity of formation water and positively correlated with temperature, injection pressure, and injection volume. Moreover, the plugging efficiency of gel particles for larger pores (>10.0 ms) was always better than that for smaller pores (0.10–10.0 ms).

中文翻译：

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核磁共振技术定量评估凝胶颗粒体系驱油剂的堵漏效果

凝胶颗粒剖面的改性和驱油是在油田中稳定油，控制水和延长生产周期的主要技术方法之一。在各种条件下定量评估置换剂对不同尺寸孔隙的堵塞效果，可为油田开发提供有用的指导。在这项研究中，核磁共振技术和动态物理模拟实验被用来定量评估不同规模的孔隙堵塞效果。还研究了渗透率，温度，注入压力，注入量和地层水盐度对堵漏效果的影响。结果表明，聚乙二醇（PEG）-1凝胶颗粒体系驱油剂可以有效地堵塞不同规模的孔隙。对于人造核，堵塞尺寸在0.10到59.95毫秒之间，对于天然岩心，堵塞尺寸在0.10到1144.64毫秒之间。凝胶颗粒的堵塞作用与地层水的渗透率和盐度呈负相关，与温度，注入压力和注入量呈正相关。此外，较大孔（> 10.0 ms）的凝胶颗粒堵塞效率始终优于较小孔（0.10-10.0 ms）的堵塞效率。