油气地质与采收率2025，Vol.32Issue(2)：122-131,10.DOI:10.13673/j.pgre.202311028
聚合物微球与孔喉宏微观匹配界限
Macro-micro matching limits of polymer microspheres with pore throats in enhanced oil recovery
摘要
Abstract
Polymer microspheres can continue to migrate through the pore throats by the elastic deformation after plugging pore throats,achieving deep profile control and flooding in reservoirs.The successful application of polymer microspheres hinges on their excellent match with the reservoir,necessitating the study of their macroscopic core scale and microscopic pore-throat scale matching relationships.First,two sizes of polymer microspheres(MG-1 and MG-2)were synthesized,and injectivity experiments were conducted through long different permeability cores with intermediate pressure measurement points.The macroscopic match-ing characteristics between polymer microspheres and pore throats were identified through the three-stage pressure gradient curve patterns.Second,the pore-throat models were used to carry out microfluidic displacement experiments of polymer microspheres to evaluate the microscopic matching characteristics of polymer microspheres with pore throats based on their entry and retention status in throats at different scales.The matching patterns between polymer microspheres and cores can be divided into three types:end-face plugging,matching,and direct passage.Based on the pressure difference at the ends of the polymer microsphere injection and the subsequent water flooding,the upper limit of the macroscopic matching coefficient between MG-1 and pore throats was deter-mined to be 1.3 to 1.4,with the optimal matching coefficient being 0.8 to 1.0.The microfluidic displacement results show that mi-crospheres need to be under a certain pressure to enter smaller pores and throats.The maximum matching coefficients for MG-1 to enter and retain in cross-sectional and axial models are 1.21 and 1.47,respectively,corresponding to the optimal matching coeffi-cient and upper limit of microscopic matching between MG-1 and pore throats.The macro-micro matching characteristics of poly-mer microspheres with pore throats are highly consistent.The error is caused by the high-pressure gradient in microfluidic displace-ment and the end-face effect in core flooding.Considering the macro and micro matching characteristics comprehensively,the opti-mal matching coefficient for MG-1 with pore throats is around 1.0,with an upper limit of about 1.4.The experimental results show that it is feasible to use microfluidic displacement experiments to replace complex core flooding experiments to evaluate the match-ing of polymer microspheres with pore throats.关键词
聚合物微球/孔喉匹配/匹配系数/岩心驱替/微流控/深部调驱Key words
polymer microsphere/pore throat matching/matching coefficient/core flooding/microfluidics/deep profile control and flooding分类
能源科技引用本文复制引用
陈鑫,刘顺,赵刚,杨嘉辉,李宜强,刘哲宇,刘建斌..聚合物微球与孔喉宏微观匹配界限[J].油气地质与采收率,2025,32(2):122-131,10.基金项目
国家自然科学基金面上项目"超深致密油储层多效应协同驱油机理及强化排驱调控研究"(52174032),国家自然科学基金青年基金项目"地下复杂结构孔隙中稠油多重乳化机理与粒径预测"(52304035),中国博士后科学基金面上项目"弹性颗粒裂缝-孔隙耦合封堵模型及液流转向机制研究"(2023MD744256),国家资助博士后研究人员计划(C档)"脉冲注入弹性颗粒孔喉流动行为及运移封堵模型研究"(GZC20232141),陕西省博士后科研项目"油水前缘界面孔喉稳定机理及脉冲调控研究"(2023BSHYDZZ161). （52174032）
