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.
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