The Effect of Solid-Liquid Interfacial Interactions on Shale Oil Flow in the Micro-Nano Scale Porous Media

Shale oil plays a significant role in mitigating the gradual depletion of conventional oil resources worldwide. In the micro-nano scale porous media of shale reservoirs, the solid-liquid interfacial interactions between fluid and pore walls, such as adsorption and slip, have a substantial impact on fluid flow. To accurately characterize the impact of solid-liquid interfacial interactions on shale oil flow, we constructed various types of organic-inorganic shale multimineral digital core models by using the Markov Chain-Monte Carlo method and the clustering analysis method. The flow in porous media was simulated by using the direct numerical simulation (DNS) method, and the interactions of the solid-liquid interface on shale oil were modeled by incorporating customized slip boundary conditions and a viscosity model that depends on the pore type and spatial distance. The flow of shale oil in porous media with different slip lengths, adsorption layer thicknesses, adsorbed fluid viscosity, and the organic pore volume fraction (OPVF) was simulated, and the influence of various factors on shale oil flow capacity was analyzed and discussed. This study provides reference values for the development of shale oil resources.