Study On Lamadian Oilfield Polymer After The Experiment Of Foam Flooding

Polymer flooding can expand sweep volume and improve oil displacement efficiency of water flooding, comparable to improve oil recovery by more than 10 percent, but after about 50% of the polymer flooding, still remain in the underground, these crude oil reserves of daqing oilfield is high, its reserves in large scale, development channel sand reservoir thickness and the high permeability reservoir. Indoor and digital-to-analog research results show that the foam flooding in polymer flooding can improve recovery after 15 percent.Lamadian oilfield PortugueseⅠ1-2 formation connectivity, large thickness, the problem of serious heterogeneity, high degree of residual water, mainly distributed in the segment of rhythm and top or sandwich development within the period of high water layer, and is suitable for foam flooding. Therefore in lamadian oilfield launched after polymer flooding test site foam recognition for 1 note 4 by five points area, and well testing for 6 note 12 adopt two mouth center of scale.Through the foam performance evaluation, the study of high permeability channel block foam sweep volume and expand the ability, With crude oil displacement system through the interfacial tension between the determination, research to improve oil displacement efficiency. Conduct test, injection pressure rises, injection profile modification, injection-production ability to drop, increase injection-production differential pressure, water stability, alkali and surfactant recovery, not increase, but the filtrational resistance oil wells.based did not see clearly displacement effect. Try note production problems:the injection pressure increase, Improved profile and oil:Foam stability performance is poor.Try for foam injection production problems of foam system, the optimal formula and research work. Foam system selection and performance evaluation, Injection system formula determined, Injection mode optimization design, Foam system formula. Data.the results show that the foam flooding into foam system after the implementation of the scheme began to operate, PV 0.2 oil, water drop water began to decline to 69.55% for maximum profit, decrease as the highest yield,29.72%,252.7 of polymer flooding, t, after foam flooding 10.68% enhancing oil recovery.Through field experiment, polymer flooding in daqing oilfield after exploring the feasibility of foam complex flooding, further improve the recovery test and economic effect.