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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
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(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)
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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 |
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