胶囊聚合物驱提高采收率方法  

Capsule polymer flooding for enhanced oil recovery

作　　者：侯健[1,2] 刘永盛 韦贝[1,2] 曹绪龙 孙建芳[4] 杜庆军 宋考平[5] 元福卿 孙鹏霄[6] 季岩峰 赵方剑 刘瑞欣[1,2] HOU Jian;LIU Yongsheng;WEI Bei;CAO Xulong;SUN Jianfang;DU Qingjun;SONG Kaoping;YUAN Fuqing;SUN Pengxiao;JI Yanfeng;ZHAO Fangjian;LIU Ruixin(State Key Laboratory of Deep Oil and Gas,China University of Petroleum(East China),Qingdao 266580,China;School of Petroleum Engineering,China University of Petroleum(East China),Qingdao 266580,China;SINOPEC Shengli Oilfield Company,Dongying 257000,China;SINOPEC Petroleum Exploration and Production Research Institute,Beijing 102206,China;Unconventional Petroleum Research Institute,China University of Petroleum(Beijing),Beijing 102249,China;Tianjin Branch of CNOOC(China)Co.,Ltd.,Tianjin 300450,China)

机构地区：[1]中国石油大学(华东)深层油气全国重点实验室,山东青岛266580 [2]中国石油大学(华东)石油工程学院,山东青岛266580 [3]中国石化胜利油田分公司,山东东营257000 [4]中国石化石油勘探开发研究院,北京102206 [5]中国石油大学(北京)非常规油气科学技术研究院,北京102249 [6]中海石油(中国)有限公司天津分公司,天津300450

出　　处：《石油勘探与开发》2024年第5期1092-1100,共9页Petroleum Exploration and Development

基　　金：国家自然科学基金联合基金重点项目“柔性胶囊聚合物驱提高采收率的基础理论研究”(U21B2070);国家自然科学基金面上项目“微胶囊聚合物驱颗粒流-弹性湍流转捩机制及驱油机理研究”(52374061)。

摘　　要：针对常规聚合物驱剪切易降解、注入困难等难题,提出了胶囊聚合物驱提高采收率方法,采用多尺度渗流实验及模拟技术分析了胶囊聚合物驱渗流机制与驱油机理。研究表明:胶囊聚合物驱具有易注入、抗剪切、地层可控释放、吸附滞留率小的优势,具有很好的远距离运移能力,可实现聚合物驱“油藏深部增黏”;胶囊聚合物增黏程度越高,抑制黏性指进的能力越强,驱替前缘越趋于均匀,驱替波及范围越大。胶囊聚合物的释放性能主要受温度影响,温度越高,胶囊聚合物溶液增黏速度越快,而矿化度对胶囊聚合物溶液增黏速度的影响很小。胶囊聚合物驱适用于传统聚合物驱效果不佳的高含水油藏、井距较大的海上聚合物驱油藏、常规聚合物注入性较差的中低渗透油藏等。实施胶囊聚合物驱应“因地制宜”,根据目标油藏条件设计合理的胶囊粒径、释放时间以达到最优的驱油效果。To solve the problems of shear degradation and injection difficulties in conventional polymer flooding,the capsule polymer flooding for enhanced oil recovery(EOR)was proposed.The flow and oil displacement mechanisms of this technique were analyzed using multi-scale flow experiments and simulation technology.It is found that the capsule polymer flooding has the advantages of easy injection,shear resistance,controllable release in reservoir,and low adsorption retention,and it is highly capable of long-distance migration to enable viscosity increase in deep reservoirs.The higher degree of viscosity increase by capsule polymer,the stronger the ability to suppress viscous fingering,resulting in a more uniform polymer front and a larger swept range.The release performance of capsule polymer is mainly sensitive to temperature.Higher temperatures result in faster viscosity increase by capsule polymer solution.The salinity has little impact on the rate of viscosity increase.The capsule polymer flooding is suitable for high-water-cut reservoirs for which conventional polymer flooding techniques are less effective,offshore reservoirs by polymer flooding in largely spaced wells,and medium to low permeability reservoirs where conventional polymers cannot be injected efficiently.Capsule polymer flooding should be customized specifically,with the capsule particle size and release time to be determined depending on target reservoir conditions to achieve the best displacement effect.

关 键 词：聚合物驱 胶囊聚合物 聚合物延迟释放 渗流机制 驱油机理 数值模拟 提高采收率 

分 类 号：TE357[石油与天然气工程—油气田开发工程]