Abstract An anionic–nonionic surfactant was proposed as viscosity reducer (VR) for study. Firstly, bulk emulsion behavior was investigated to optimize the emulsification process. Secondly, core flooding tests were carried out to evaluate the synergistic effect of VR and steam for improved heavy oil recovery, as well as emulsion properties along the distance. Thirdly, a 2D microvisual study was performed to illustrate emulsion migration and plug property in porous media. Finally, VR assisted steam stimulation was conducted for field application, and gained satisfactory result both in oil–steam ratio and oil recovery, providing an alternative for enhancing oil recovery in similar steamflooded reservoirs.

中文翻译：

---

稠油注蒸汽过程中用降粘剂乳化和提高采收率

摘要 提出了一种阴离子-非离子表面活性剂作为降粘剂 (VR) 进行研究。首先，研究了本体乳液行为以优化乳化工艺。其次，进行了岩心驱油试验，以评估 VR 和蒸汽对提高稠油采收率的协同作用，以及沿距离的乳化特性。第三，进行了二维显微视觉研究，以说明多孔介质中的乳液迁移和堵塞特性。最后，进行了VR辅助蒸汽增产现场应用，在油汽比和采收率方面均取得了满意的效果，为类似蒸汽驱油藏提高采收率提供了一种替代方案。