油气地质与采收率2025，Vol.32Issue(2)：132-141,10.DOI:10.13673/j.pgre.202406016
驱油用缓释增黏型微胶囊聚合物的研制
Development of slow-release and thickening microencapsulated polymers for oil recovery
摘要
Abstract
In order to solve the problems of high injection resistance and large shear viscosity loss in polymer flooding agents,the microencapsulated polymers with slow-release and thickening properties were prepared by inverse emulsion polymerization and in situ polymerization with polyurethane prepolymer as the shell material and polymer as the core material.The formulation of the emulsion and the parameters for the preparation of the polymer core and the microcapsule shell were determined by a single factor experiment.A stable inverse emulsion was formed under the conditions of a compound emulsifier with an HLB of 6.4,an oil vol-ume ratio of 50%,and an emulsifier dosage of 10%.Under the conditions of 45%aqueous monomer dosage,certain initiator dos-age(0.04%of polymeric monomer),reaction temperature of 45 ℃,and reaction time of 4.5 h,polymer core materials were pre-pared with a monomer conversion rate of 98.44%and an apparent viscosity of 13.37 mPa·s in the solution.Under the conditions of a shell material mixing rate of 800 r/min,reaction temperature of 50 ℃,reaction time of 4 h,and shell-to-core ratio of 1∶4,micro-encapsulated polymers were prepared.The surface of the microcapsule shell was smooth and intact,with high sphericity.The char-acterization results show that the infrared spectrum of the microencapsulated polymer contains characteristic peaks of both polymer and polyurethane,indicating that polyurethane microcapsules have achieved the encapsulation of the polymer.The particle size of microencapsulated polymers is mainly distributed between 300 nm and 500 nm,and the median particle size is 368 nm,with good uniformity and sub-micron size.The initial viscosity of microencapsulated polymers in water is 0.5 mPa·s,which increases to 12.57 mPa·s after 5 d.The viscosity retention rate after 90 days is 94.99%,indicating good slow-release and thickening properties and thermal stability.When the shear speed is 12 000 r/min,the viscosity retention rate of microencapsulated polymers is 98.25%,indi-cating good shear resistance.关键词
聚合物驱/微胶囊聚合物/参数优化/缓释增黏性能/抗剪切性能Key words
polymer flooding/microencapsulated polymer/parameter optimization/slow-release and thickening property/shear re-sistance分类
能源科技引用本文复制引用
巩锦程,束青林,元福卿,徐辉,董雯,宋倩..驱油用缓释增黏型微胶囊聚合物的研制[J].油气地质与采收率,2025,32(2):132-141,10.基金项目
国家自然科学基金联合基金项目"柔性胶囊聚合物驱提高采收率的基础理论研究"(U21B2070). （U21B2070）
