中国石油大学学报（自然科学版）2025，Vol.49Issue(2)：175-182,8.DOI:10.3969/j.issn.1673-5005.2025.02.016
基于可视化试验的普通稠油油藏N2降黏泡沫驱油特征
Characteristics of N2 viscous-reducing foam flooding in ordinary heavy oil reservoirs based on visualization experiments
摘要
Abstract
N2 viscous-reducing foam flooding is a proven technique for enhancing oil recovery during mid to late stages of de-velopment in ordinary heavy oil reservoirs,but there are few studies on its oil displacement mechanisms using pore-scale vi-sualization experiments.In this study,visualization experiments were carried out using microscopic etching model and 2D vi-sualization plate model respectively.The microscopic oil displacement characteristics and oil mobilization mechanisms in N2 viscous-reducing foam flooding were investigated,and the impacts of gas-liquid ratio and injection method were examined.The results indicate that N2 viscous-reducing foam flooding can significantly reduce gas channeling during the late stage of N2 flooding,effectively increase gas residence time,expand sweep area and improve oil displacement efficiency.N2 viscous-re-ducing foam can improve oil displacement efficiency mainly by emulsifying dispersion,reducing viscosity and stripping,and expanding sweep coefficient by combining with emulsion oil droplets for plugging.The sweep coefficient and oil displacement efficiency tend to the highest when the gas-liquid ratio is set at 3∶1.When gas and liquid are co-injected,N2 viscous-reduc-ing foam can be pre-formed in wellbore and is stable in the rock formation,which is conducive to emulsified viscosity reduc-ing and plugging.The sweep coefficient and oil displacement efficiency of the gas-liquid co-injection method are significantly higher than those of gas injection alone and alternative gas-liquid injection methods.关键词
普通稠油/N2降黏泡沫驱/可视化试验/原油动用机制/波及系数/驱油效率Key words
ordinary heavy oil/N2 viscous-reducing foam flooding/visualization experiment/oil mobilization mechanism/sweep coefficient/oil displacement efficiency分类
能源科技引用本文复制引用
张梦园,李宾飞,曾祥晖,付显威,辛岩,李兆敏..基于可视化试验的普通稠油油藏N2降黏泡沫驱油特征[J].中国石油大学学报（自然科学版）,2025,49(2):175-182,8.基金项目
国家自然科学基金项目(51574264) （51574264）
