Wei Lixin, Zhang Lin, Chao Meng, Jia Xinlei, Liu Chao, Shi Lijun
School of Petroleum Engineering, Northeast Petroleum University, Daqing 163318, China.
Gas Production Branch of Daqing Oilfield Co Ltd., Daqing 163453, China.
ACS Omega. 2021 Jul 2;6(27):17709-17719. doi: 10.1021/acsomega.1c02352. eCollection 2021 Jul 13.
The application of chemical flooding improves the stability of the produced emulsion, which reduces the demulsification efficiency of conventional demulsifiers. To improve the demulsification effect, in this paper, a new multibranched nonanionic polyether demulsifier, FYJP, was prepared by grafting carboxylate based on a nonionic demulsifier. The FYJP demulsifier could generate an initiator through --butylphenol, triethylenetetramine, and methanol, which was polymerized with ethylene oxide (EO) and propylene oxide (PO) to produce a nonionic polyether demulsifier. Sodium chloroacetate was used to modify the polyether demulsifier to obtain a new type of nonanionic polyether demulsifier. The FYJP polyether demulsifier was characterized by the hydrophilic-lipophilic balance (HLB) value, relative solubility (RSN), and surface activity of the demulsifier, and the demulsification mechanism was analyzed by a microscopic demulsification process test, and the effect of demulsifier dosage on the demulsification effect was discussed. Meanwhile, a dehydration test was carried out. The experimental results showed that the highest dehydration rate of the demulsifier was 94.7% at 85 °C, 100 ppm demulsifier dosage, 50 mL of a W/O emulsion, and 120 min demulsification time. The abovementioned studies show that FYJP is an effective demulsifier for chemical flooding emulsions, and this work promises to provide a reference for future demulsifier research.
化学驱油的应用提高了产出乳液的稳定性，这降低了传统破乳剂的破乳效率。为提高破乳效果，本文基于非离子破乳剂通过接枝羧酸盐制备了一种新型多支链非离子聚醚破乳剂FYJP。FYJP破乳剂可通过叔丁基苯酚、三乙烯四胺和甲醇生成引发剂，该引发剂与环氧乙烷（EO）和环氧丙烷（PO）聚合生成非离子聚醚破乳剂。用氯乙酸钠对聚醚破乳剂进行改性，得到新型非离子聚醚破乳剂。通过破乳剂的亲水亲油平衡（HLB）值、相对溶解度（RSN）和表面活性对FYJP聚醚破乳剂进行了表征，并通过微观破乳过程试验分析了破乳机理，讨论了破乳剂用量对破乳效果的影响。同时进行了脱水试验。实验结果表明，在85℃、破乳剂用量100 ppm、50 mL W/O乳液和破乳时间120 min的条件下，破乳剂的最高脱水率为94.7%。上述研究表明，FYJP是一种有效的化学驱油乳液破乳剂，这项工作有望为今后破乳剂的研究提供参考。
