Capsule polymer flooding for enhanced oil recovery  

作　　者：HOU Jian LIU Yongsheng WEI Bei CAO Xulong SUN Jianfang DU Qingjun SONG Kaoping YUAN Fuqing SUN Pengxiao JI Yanfeng ZHAO Fangjian LIU Ruixin 

机构地区：[1]State Key Laboratory of Deep Oil and Gas,China University of Petroleum(East China),Qingdao 266580,China [2]School of Petroleum Engineering,China University of Petroleum(East China),Qingdao 266580,China [3]SINOPEC Shengli Oilfield Company,Dongying 257000,China [4]SINOPEC Petroleum Exploration and Production Research Institute,Beijing 102206,China [5]Unconventional Petroleum Research Institute,China University of Petroleum(Beijing),Beijing 102249,China [6]Tianjin Branch of CNOOC(China)Co.,Ltd.,Tianjin 300450,China

出　　处：《Petroleum Exploration and Development》2024年第5期1261-1270,共10页石油勘探与开发（英文版）

基　　金：Supported by the Joint Funds of the National Natural Science Foundation of China(U21B2070);Natural Science Foundation of China(52374061)。

摘　　要：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：fault-controlled fractured-vuggy reservoirs fractured-vuggy structure features 3D physical model bottom water flooding remaining oil potential exploitation strategy 

分 类 号：TE357.46[石油与天然气工程—油气田开发工程]