油气地质与采收率2025，Vol.32Issue(5)：132-145,14.DOI:10.13673/j.pgre.202405062
CO2-EOR泡沫稳定性机理研究进展及其应用前景
Research progress on stability mechanism of CO2-EOR foam and its application prospects
摘要
Abstract
CO2 foam flooding,as an enhanced oil recovery technology integrating the advantages of chemical flooding and gas flooding,significantly enhances crude oil production in complex reservoirs by synergistically utilizing the interfacial modulation capabilities of surfactants and the mobility control characteristics of CO2.In recent years,it has demonstrated substantial potential in the development of unconventional oil and gas reservoirs,including heavy oil,shale oil,and tight oil.This paper reviewed the principle and influencing factors of CO2 foam stability,the methods to improve the stability of CO2 foam,the enhanced oil recovery mechanism under CO2 foam flooding,and its application in unconventional oil reservoirs such as heavy oil and shale oil.Firstly,the principle of CO2 foam stability was fundamentally governed by the following factors:the structures and properties of the liquid film,including drainage dynamics and gas diffusion rates;the hydrophilic-lipophilic balance of surfactants,and the Gibbs-Marangoni effect induced by interfacial tension gradients at bubble surfaces.Then,the effects of reservoir environments such as temperature,pressure,salinity,and crude oil on the stability of CO2 foam were analyzed.The increase in temperature and salinity had an adverse effect on the formation and stability of foam.The rise in pressure had a positive impact on CO2 foam stability.The light and heavy components of crude oil had different effects on foam stability.The methods of polymers,ionic fluids,nanoparticles,and the synergistic effect of surfactants and nanoparticles were proposed to improve the stability of CO2 foams.Finally,the enhanced oil recovery mechanism of CO2 foam flooding was explained:the foam selectively blocks in the porous medium through the Jamin effect to improve the sweep efficiency,achieve crude oil emulsification/viscosity reduction,reduce the oil-water interfacial tension,change wettability,improve the mobility ratio of oil phase and displacement phase,and increase the fluidity of crude oil.Based on this enhanced oil recovery mechanism,the application of CO2 foam flooding in unconventional oil and gas reservoirs for enhanced oil recovery(EOR)is summarized.关键词
CO2泡沫/泡沫稳定原理/泡沫稳定性/采油机理/非常规油气/EORKey words
CO2 foam/foam stability principle/foam stability/oil recovery mechanism/unconventional oil and gas/enhanced oil recovery分类
能源科技引用本文复制引用
付健,张岑茜,王晨月,孙珊珊,佘跃惠,张凡..CO2-EOR泡沫稳定性机理研究进展及其应用前景[J].油气地质与采收率,2025,32(5):132-145,14.基金项目
国家自然科学基金重点项目"低渗透油藏提高原油采收率的生物化学基础研究"(51634008),国家自然科学基金面上项目"循环激活本源微生物提高原油采收率的基础研究"(51574038). （51634008）
