聚醚低温破乳剂的合成及性能评价

Synthesis and Property of Low Temperature Polyether Demulsifier

针对油田稠油破乳难度大、常规破乳剂适应性差、脱水温度高的问题,合成了聚醚低温破乳剂P-51T,考察了环氧乙烷和环氧丙烷质量比及辅剂对破乳剂破乳脱水效果的影响,并在胜利油田孤五联合站开展了现场试验。研究表明,在起始剂与环氧乙烷的质量比1∶19、环氧乙烷和环氧丙烷质量比1∶3、聚醚与烷基苯磺酸单乙醇胺质量比5∶1的条件下合成的低温破乳剂P-51T,与油田常用破乳剂相比,具有脱水速度快、破乳效果好的特点,在较低温度下优势更为明显。现场试验结果表明,脱水温度从73数80℃降低至65℃,破乳剂P-51T处理后外输油含水低于0.8%,稳定达到指标要求(<2%)。低温破乳剂P-51T的推广应用可以减少加热能耗,降低生产成本,应用前景广阔。

A new polyether demulsifier P-51T was synthesized to solve the difficulties in heavy oil demulsification,poor adaptability of conventional demulsifiers and high dehydration temperature.The effects of the mass ratio of ethylene oxide to propylene oxide and the adjuvant types on the demulsification and dehydration performance of the demulsifier were studied.Field tests were carried out at Guwu united station of Shengli oilfield.Researches showed that the optimal synthesis conditions of P-51T demulsifier was as follows,the mass ratio of initiator to ethylene oxide was 1∶19,the mass ratio of ethylene oxide to propylene oxide was 1:3,and the mass ratio of polyether to alkylbenzene sulfonic acid monoethanolamine was 5∶1.Compared with the demulsifiers commonly used in oilfields,P-51T had the advantages of faster dehydration speed and better demulsification effect.At a lower temperature,superiorities of P-51T were more obvious.In field tests,when the dehydration temperature was reduced from 73—80℃to 65℃,after the demulsifier treatment,the water content of the transported oil was less than 0.8%,and met the standards stably(<2%).The application of demulsifier P-51T can reduce heating energy consumption,decrease production costs,and has a broad application prospect.