磺基甜菜碱BS11的界面特性研究

Interfacial Activity of Sulfobetaine BS11 as Surfactant for EOR

用矿化度3.7 g/L的大庆杏五中回注污水配液,研究了作为驱油表面活性剂的磺基甜菜碱BS11污水溶液与大庆杏五中井口脱水原油之间的界面张力,表明BS11具有很强的降低油水界面张力的能力。在45℃时,0.05-3.0 g/L的BS11污水溶液与原油间界面张力（动态最低值）均达到超低（10^-3mN/m及以下）,在45-80℃温度范围,0.1,1.0,3.0 g/L的BS11污水溶液的界面张力维持超低且变化很小。在45℃时,加入1.0 g/L Na2CO3的0.05-3.0 g/L的BS11污水溶液,加入5.0 g/L Na2CO3的0.5-3.0 g/L的BS11污水溶液,加入≤125 g/L NaCl的0.5g/L的BS11污水溶液,加入≤1.5 g/L CaCl2的0.5和3.0 g/L的BS11污水溶液,界面张力均维持超低。图6参10。

The interfacial tension, IFT, between aqueous solution of sulfobetaine BS11 in produced water of TSD = 3.7 g/L for flooding reservoirs in central district Xing-5, Daqing, and dehydrated crude oil from a wellhead in this district is investigated and demonstrates the high IFT reducing capability of this surfactant for EOR. With the crude oil, BS11 solution of concentration in range 0.05-3.0 g/L creates ultralow IFT （minimum dynamical values） of magnititude 10-3 mN/m and below at 45℃ and of concentration 0.1,1.0, and 0g/L at- 45-80℃. Ultralow values of IFT with the crude oil are observed at 45℃ for BS11 solution of concentration 0.05-3.0 g/L with 1.0 g/L Na2CO3 added, of concentration 0.5--3.0 g/L with 5.0 g/L Na2CO3 added, of concentration 0.5 g/L with 4125 g/L NaCl added, of concentration 3.0 g/L with 4150 g/L NaCl added, and of concentration 0.5 and 3.0 g/L with 41.5 g/L CaCl2 added.