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Viscoelastic oil displacement system with remarkable salt tolerance via mixed zwitterionic surfactants
HAN Yugui1,2, WANG Yefei1, WANG Qiuxia2, ZHAO Peng2, WANG Hongyu2
(1.School of Petroleum Engineering in China University of Petroleum (East China), Qingdao 266580, China;2.Bohai Oilfield Research Institute of Tianjin Branch, CNOOC China Limited, Tianjin 300459, China)
Abstract:
The ultra-long-chain monounsaturated amidobetaine (LJS) and amidosulfobetaine (LJH) surfactants were combined to obtain the wormlike micelles system at the simulated reservoir conditions (Salinity is 20 g/L, [Mg2+]+[Ca2+]=0.5 g/L,temperature 80 ℃), through which the effects of salinity, temperature, and aging time on the viscosity were investigated. It is found that the viscosity of the S2H1aqueous solution with a low concentration (0.3%) can raise up to 42.2 mPa·s, and the interfacial tension of water/crude oil reaches 10-2mN/m order of magnitudeat the simulated harsh reservoir conditions. The viscosity and interfacial activity of the S2H1 system are almost unchanged at a higher salinity ([Mg2+]+[Ca2+]=1.25 g/L). And this system still presents good stability after 90 d aging.
Key words:  wormlike micelle  viscoelasticity  salt tolerance  interfacial activity  oil displacement efficiency