Abstract
Clarifying enhanced oil flow behaviors is crucial because of the large number of pore-throat structures and the complex oil–wall molecular interactions in shale/tight reservoirs. According to the single pore model with pore-throat structures, total hydrodynamic resistance and enhanced oil flow models are established by coupling the molecular interaction effect and the entrance effect (caused by pore-throat structures). The results show that, with decreasing oil–wall molecular interactions, the total hydrodynamic resistance decreases because of increasing slip length and decreasing near-wall oil viscosity and the hydrodynamic resistance of the entrance effect gradually dominates. Additionally, the enhanced flow capacity when considering the entrance effect can be several times smaller than that without considering it. With decreasing minimum pore radius and increasing variation trend of radius, the hydrodynamic resistance of the entrance effect increases, and the enhanced oil flow capacity decreases with increase of minimum pore radius and variation trend of radius.
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