The Effects of High Temperature and High Salinity on Surface Activity of Cationic Gemini Surfactant

The surface activities of a commercial cationic gemini surfactant PF-CGS at 25℃ in pure water,saturated NaCl brine,as well as saturated NaCl brine containing 1000 mg·L-1 Ca2+ and Mg2+ were examined.For comparison,the surface activities of these solutions after 16h of age at 135℃ were also investigated.It was found that CMC,C20 and γCMC of PF-CGS solution would decrease upon increasing salinity of the surfactant solution,and after ageing,γCMC did not change,while CMC and C20 decreased in some extent compared with those found in non-aging solutions.These results shows cationic gemini surfactant posses good salt-tolerance and hear-resistance and has good potential to be used in high-temperature and high-salinity oil reservoir environment.