Abstract Both amphiphilic polymer and surfactant can be used to enhance oil recovery (EOR) by emulsifying crude oil. In this work, the emulsifying ability and emulsion stability of combination system constituted by amphiphilic polymer (APC16) and anionic surfactant (erucyl dimethyl amidopropyl betaine, EDAB) were studied. The bottle test was selected to evaluate the emulsifying ability. The TURBISCAN Lab and laser particle size analyzer were applied to evaluate emulsion stability. The rheometer, interfacial tensiometer and microscope were used to explore the stability mechanisms of emulsions. The results showed that the combination system exhibited better emulsifying ability than APC16 and emulsion formed by the combination system also performed greater stability than those formed by either EDAB or APC16 system. The better emulsifying ability of the combination system depended on low interfacial tension (IFT) due to the addition of surfactant. The greater emulsion stability of the combination system can attribute to three perspectives. Firstly, emulsion formed by the combination system exhibited higher external viscosity, which slowed down the migration velocity of the emulsion droplets. Secondly, the excellent interfacial film strength prevented the emulsion droplets from coalescence. Finally, the small emulsion droplet performed lower floating and coalescence velocity so as to increase emulsion stability.

中文翻译：

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表面活性剂协同两亲聚合物体系对原油乳液的乳化及稳定机理

摘要 两亲聚合物和表面活性剂均可用于原油乳化提高采收率（EOR）。本工作研究了由两亲性聚合物（APC16）和阴离子表面活性剂（芥子基二甲基酰胺丙基甜菜碱，EDAB）构成的组合体系的乳化能力和乳液稳定性。选择瓶子试验来评价乳化能力。TURBISCAN Lab 和激光粒度分析仪用于评估乳液稳定性。使用流变仪、界面张力仪和显微镜研究乳液的稳定性机理。结果表明，组合体系的乳化能力优于APC16，组合体系形成的乳液也比EDAB或APC16体系形成的乳液稳定性更高。由于添加了表面活性剂，组合体系更好的乳化能力取决于低界面张力（IFT）。组合系统更大的乳液稳定性可归因于三个方面。首先，组合体系形成的乳液具有较高的外部粘度，减缓了乳液液滴的迁移速度。其次，优异的界面膜强度阻止了乳液液滴的聚结。最后，小乳液液滴表现出较低的漂浮和聚结速度，以增加乳液稳定​​性。组合体系形成的乳液具有较高的外部粘度，减缓了乳液液滴的迁移速度。其次，优异的界面膜强度阻止了乳液液滴的聚结。最后，小乳液液滴表现出较低的漂浮和聚结速度，以增加乳液稳定​​性。组合体系形成的乳液具有较高的外部粘度，减缓了乳液液滴的迁移速度。其次，优异的界面膜强度阻止了乳液液滴的聚结。最后，小乳液液滴具有较低的漂浮和聚结速度，以增加乳液稳定​​性。