摘要
配制长庆北三区聚表二元驱模拟采出液，其中聚丙烯酰胺1000 mg/L、甜菜碱表面活性剂1667 mg/L，含水率10%~50%。在30%含水率模拟采出液、脱水温度55℃、破乳剂加量100 mg/L、脱水时间40 min条件下进行破乳脱水实验，从28种破乳剂中筛选出破乳效果较好的KL-9、KL-10、KL-14磺酸盐型水溶性破乳剂。在破乳剂加量为50 mg/L时，KL-14在45、50、55℃的脱水率分别为92.6%、97.8%和99.9%，均大于KL-9、KL-10，脱水效果最好。在10%、50%含水率模拟采出液中也得到类似的结果。因此，针对10%~50%含水率模拟采出液，最佳破乳剂为KL-14。破乳温度升高，相同破乳剂加量下的脱水率增加；KL-14破乳剂加量增大，相同温度下的脱水率增加；随脱水时间延长，脱水率增大并逐渐稳定。最佳破乳条件为：脱水温度50~55℃、破乳剂加量100 mg/L、脱水时间30 min。
Abstract
The simulated produced fluid (10%—50% water ratio) for polymer-surfactant flooding of north third region in Changqing oilfield was prepared, containing 1000 mg/L polyacrylamide and 1667 mg/L betaine surfactant. The demulsification experiment of simulated produced fluid (30% water ratio) was carried out under the condition of 55℃ dehydration temperature, 100 mg/L demulsifier and 40 min dehydration time. The water-soluble sulfonate demulsifier KL-9, KL-10 and KL-14 were screened from 28 kinds of demulsifier, showing better demulsification effect. When the dosage of demulsifier was 50 mg/L, the dewatering rate of KL-14 was 92.6%, 97.8% and 99.9% under dehydration temperature 40℃, 45℃ and 50℃, respectively, greater than that of KL-9, KL-10. The demulsification effect of KL-14 was the best. The similar results were obtained from simulated produced fluid with 10% and 50% water ratio. Therefore, it was concluded that KL-14 was the best demulsifier for the simulated produced fluid with 10%—50% water ratio. The dehydration rate increased under same demulsifier dosage, with increasing demulsification temperature. The dehydration rate of KL-14 increased under same dehydration temperature, with increasing demulsifier dosage. With extending dehydration time, the dehydration rate increased and turned to be stable gradually. The optimum demulsification condition was obtained as follows: 50—55℃ dehydration temperature, 100 mg/L demulsifier, 30 min dehydration time.
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