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Research on polymer profile control and oil displacement technology in high temperature and high salinity reservoir

Zhang Yunlai1,Lu Xiangguo2,Sun Shuang3,Pan Ling4,Zhu Guohua4(1.Tianjin Branch of CNOOC,Tianjin 300452,China;2.MOE Key Laboratory of Enhanced Oil Recovery,Northeast Petroleum University,Daqing 163318,China;3.Mud Company,Bohai Drilling Engineering Co.Ltd.,CNPC,Tianjin 300280,China;4.Institute of Geological Sciences,Jiangsu Oilfield Company,SINOPEC,Yangzhou 225009,China)  
At present,the development of Jiangsu Oilfield with the characteristics of high temperature,high salinity and serious heterogeneity has been the late development stage with extra-high water-cut,and there is an urgent need to take further measures to enhance oil recovery.Recently,with the increasingly mature of Cr3+/ HPAM gel profile control and displacement technology,the Cr3+/ HPAM technology with material and technical base,which is suitable for high temperature and high salinity,has been developed.Aiming at the actual demand in the development of Jiangsu oilfield,the authors screen the Cr3+/ HPAM gel formulations which are fit for the fluid nature and characteristics of Jiangsu oilfield reservoir by using the detection equipment and modern physics simulation,and do some researches on the flow characteristics and displacement effect of gel in porous media.The results show that the ratio of polymer and Cr3+,the polymer concentration and the core permeability are the main factors that affect the ability of gel injection,and the increased oil effect by using the slug composition of profile controls plus polymer flooding is good,which is superior to pure polymer flooding.
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