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针对高浓度聚驱采出液油水分离效率及其给常规交直流电场带来的冲击,开展了该类采出液的乳化行为及脱水方法研究,研究中综合了集输工况条件下的采出液转相特征、电负性、乳化油珠粒径分布、界面性质、乳化体系的微观形态及瓶试法油水分离实验,并基于所建立模拟装置评价了脉冲供电脱水对高浓度聚驱采出液破乳脱水的适应性。结果表明,高浓度聚驱采出液复杂的乳化行为与含聚浓度直接相关,含聚浓度上升使其电负性增强,转相点呈不同程度降低,且由于促进了黏弹性界面膜的形成,乳化粒子聚并和相分离的难度增大;辅以化学破乳的脉冲供电电场脱水工艺能有效改善分离效果,提高脱水操作的稳定性。
Aiming at the separation efficiency of oil-water produced by high-concentration polymer flooding and its impact on conventional AC-DC electric field, the emulsification behavior and dehydration methods of this kind of production fluid were studied. In the study, Liquid phase characteristics, electronegativity, particle size distribution of emulsified oil droplets, interfacial properties, micro-morphology of emulsion system and oil-water separation experiment of bottle test were studied. The effects of pulse-fed dehydration on polymer flooding Fluid demulsification dehydration adaptability. The results show that the complex emulsification behavior of high polymer flooding recovery fluid is directly related to the concentration of polycondensate, the increase of polycondensation concentration increases the electronegativity, the phase transition point decreases to some extent, and the formation of viscoelastic interface membrane is promoted , The difficulty of emulsion particle aggregation and phase separation increases; the pulse electric field dehydration process combined with chemical emulsion breaking can effectively improve the separation effect and improve the stability of the dehydration operation.