石油与天然气化工2025，Vol.54Issue(2)：79-84,6.DOI:10.3969/j.issn.1007-3426.2025.02.011
微胶囊聚合物在多孔介质中的渗流与驱油特征
Seepage and oil displacement characteristics of microencapsulated polymer in porous media
摘要
Abstract
Objective In view of the problems that in the injection process conventional polymers for oil displacement are not shear resistant,and the viscosity loss is large,which affect the oil displacement effect,the method of emulsion polymerization and interfacial polymerization is adopted to introduce a shell outside the polyacrylamide to synthesize a polyurethane encapsulated polyacrylamide microencapsulated polymer.Method This paper studied the microstructure and particle size before and after shell breaking,as well as the slow release and viscosity increasing performance,shear resistance,injection ability,profile adjustment ability,and oil displacement effect.Result The result showed that the size of microcapsule before shell breaking was between 170―800 nm,and after releasing the polymer,the molecular size was between 50―350 nm;after heating at 65℃for 2 h,the shell began to break and release,after 20 h,the viscosity release rate was above 80%;the Wuyin mixer vigorously sheared for 3 min before shell breaking,the viscosity retention rate was still above 92%;the polymer could be effectively injected into rock cores with a permeability of 50×10-3―500×10-3 μm2 before shell rupture,but its ability to adjust profiles was weak.After shell breaking,the polymer could increase injection pressure in rock cores with a permeability greater than 100×10-3 μm2 and had good profile adjustment ability;injecting microencapsulated polymer after water flooding could enhance oil recovery by 15.5 percentage points.After injecting microencapsulated polymer into the mine,the wellhead pressure increased significantly.Conclusion It proves that microencapsulated polymers can break the shell and increase viscosity in the formation,and it is a new type of oil displacement polymer with good application prospects.关键词
微胶囊聚合物/抗剪切/缓释增黏/渗流规律/驱油特征Key words
microencapsulated polymer/shear resistant/slow release and thickening/seepage law/oil displacement characteristics引用本文复制引用
徐辉,宋倩,巩锦程,董雯..微胶囊聚合物在多孔介质中的渗流与驱油特征[J].石油与天然气化工,2025,54(2):79-84,6.基金项目
国家自然科学基金项目"柔性胶囊聚合物驱提高采收率的基础理论研究"(U21B2070) （U21B2070）
