壳聚糖季铵盐对O/W乳状液的破乳性能评价

Evaluation of Demulsification Performance of Chitosan Quaternary Ammonium Salt on O/W Emulsion

以壳聚糖季铵盐作为破乳剂,使用Turbiscan Lab稳定性分析仪实验研究了破乳剂浓度及处理温度对水包油(O/W)型乳状液破乳效果的影响。实验结果表明:在25~55℃的处理温度范围内,破乳剂最佳使用浓度约0.4%(体积分数),破乳剂浓度超过1.0%后,无破乳效果。在操作温度为25℃、破乳剂加药浓度为0.4%时,所测得的背散射光ΔBS曲线显示出良好的油水分层现象,相应的TSI曲线值达到最大,油滴粒径增大7倍,破乳过程在10 min之内基本完成。在25~55℃的处理温度范围内,破乳效果随温度升高而改善,最佳破乳温度为55℃。此研究对油田采出液破乳方法的选择具有指导借鉴意义。

Using chitosan quaternary ammonium salt as emulsion breaker,the effect of emulsion breaker concentration and treatment temperature on the emulsion breaking effect of oil-in-water(O/W)type emulsion is investigated experimentally using a Turbiscan Lab stability analyzer.The experimental results show that the optimum emulsion breaker concentration is around 0.4%(volume fraction)in the treatment temperature range of 25℃~55℃,and the emulsion breaking ability is basically lost after the emulsion breaker concentration exceeds 1.0%.At the operating temperature of 25℃and emulsion breaker dosing concentration of 0.4%,the measured backscattered lightΔBS curve shows good oilwater delamination,the corresponding TSI curve value reaches the maximum,the oil droplet particle size increases 7 times,and the emulsion breaking process is basically completed within 10 min.In the treatment temperature range from 25℃to 55℃,the emulsion breaking effect improves with the increasing temperature,and the best emulsion breaking temperature is 55℃.This study has guiding and reference significance for the selection of demulsification methods for oilfield produced fluids.