无碱表面活性剂羧基甜菜碱表/界面性能研究

Surface/Interface Properties of Carboxyl Betaine without Alkali for SP Flooding

研究了自制的含双键羧基甜菜碱BC的表面性能和无碱条件下与大庆原油间的界面性能。45℃时,BC的临界胶束浓度(C_(cmc))为1.02×10^(-5)mol/L,γ_(cmc)为29.603 mN/m。油水来源为大庆一厂时,在BC质量分数为0.05%~0.20%时,BC一元体系、BC/0.09%部分水解聚丙烯酰胺(HPAM)二元体系采出水溶液与原油和模拟原油间的界面张力均达到10^(-3)mN/m数量级,单一活性剂体系与模拟原油间界面张力降幅大于相应的原油结果,二元体系达到超低界面张力的时间比一元体系长。油水来源为大庆三厂时,BC一元体系采出水溶液与原油达到超低界面张力,且45℃老化160 d的界面张力仍保持在10^(-3)数量级,稳定性较好。

The surface and interfacial tensions without alkali between Daqing crude oil and homemade carboxyl betaine （BC） containing double bond were studied. The critical micelle concentration （Ccmc） of BC was 1.02×10^-5 mol/L, and γcmc 29.603 mN/ m at 45℃. When oil and produced water source was the first oil production factory in Daqing, the interfacial tension between BC surfactant solution or BC/0.09% HPAM binary solution with BC concentration of 0.05%-0.20% and crude oil or simulated crude oil reached ultralow level （10-3 mN/m magnitude）. The decrease of interfaeial tension between BC and simulated crude oil was bigger than that of crude oil. The time to reach ultralow interfacial tension of binary solution was longer than that of single surfactant solution. When oil and produced water source was the third oil production factory in Daqing, the interracial tension between 0.05%-0.20% BC surfactant solution and crude oil reached ultralow level. Furthermore, 10-3 mN/m magnitude interfaeial tension could maintain after 160 days aging at 45℃ which showed good stability of BC.