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

作　　者：陈鑫 刘顺[1] 赵刚 杨嘉辉 李宜强[3] 刘哲宇 刘建斌 CHEN Xin;LIU Shun;ZHAO Gang;YANG Jiahui;LI Yiqiang;LIU Zheyu;LIU Jianbin(School of Petroleum Engineering,Xi’an Shiyou University,Xi’an City,Shaanxi Province,710065,China;China Petroleum Coalbed Methane Co.,Ltd.,Beijing City,100028,China;School of Petroleum Engineering,China University of Petroleum(Beijing),Beijing City,102249,China)

机构地区：[1]西安石油大学石油工程学院,陕西西安710065 [2]中国石油煤层气有限责任公司,北京100028 [3]中国石油大学(北京)石油工程学院,北京102249

出　　处：《油气地质与采收率》2025年第2期122-131,共10页Petroleum Geology and Recovery Efficiency

基　　金：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)。

摘　　要：聚合物微球在封堵孔喉后能够依靠弹性变形通过孔喉继续运移,实现储层的深部调驱。聚合物微球与储层具有良好的匹配性是其成功应用的关键,因此须对两者在宏观岩心尺度和微观孔喉尺度上的匹配关系进行研究。首先,合成了2种尺寸的聚合物微球(MG-1和MG-2),利用带中间测压点的不同渗透率长岩心进行聚合物微球注入性实验,通过三段压差曲线形态,明确聚合物微球与孔喉的宏观匹配特征;然后,利用孔隙-喉道模型开展聚合物微球微流控驱替实验,根据其在不同尺寸喉道内的进入和滞留状态评价聚合物微球与孔喉的微观匹配特征。聚合物微球与岩心的匹配模式可以划分为端面封堵型、匹配型和直接通过型3类。根据注入聚合物微球结束时刻和后续水驱替结束时刻的压差变化,可以明确MG-1与孔喉的宏观匹配系数上限为1.3~1.4,最佳匹配系数为0.8~1.0;微流控驱替实验结果表明,聚合物微球需要在一定压力下才能进入更小的孔隙和喉道,MG-1在截面模型和轴向模型中能够进入并滞留的最大匹配系数分别为1.21和1.47,分别对应着聚合物微球与孔喉的最佳匹配系数和微观匹配系数上限。聚合物微球与孔喉的宏微观匹配特征具有高度的一致性,存在微小差异的原因在于微流控驱替具有较高的压差且岩心驱替具有端面效应。综合考虑宏微观匹配特征,MG-1与孔喉的最佳匹配系数约为1.0,匹配系数上限约为1.4。实验结果表明,通过微流控驱替实验代替复杂岩心驱替实验评价聚合物微球与孔喉匹配性研究是可行的。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 matching 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 determined to be 1.3 to 1.4,with the optimal matching coefficient being 0.8 to 1.0.The microfluidic displacement results show that microspheres 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 coefficient and upper limit of microscopic matching between MG-1 and pore throats.The macro-micro matching characteristics of polymer microspheres with pore throats are highly consistent.The error is caused by the high-pressure gradient in microfluidic displacement and the end

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 

分 类 号：TE357.469[石油与天然气工程—油气田开发工程]