Abstract
The underlying miscible mechanism of hydrocarbon gas and crude oil acts a significant role for enhanced oil recovery in deep reservoirs. For the first time, molecular dynamics simulations are performed to characterize the miscible behaviors of C10H22(C7H17N)/C3H8 system in silica pore model at high temperature and pressure. The simulation results show that vdW interactions between oil phase and gas phase are the main driving force for their miscible process. Notably, there exists an optimum miscibility pressure for C10H22/C3H8 system under a certain temperature. Furthermore, our investigations indicate that hydrocarbon gas flooding is more effective for apolar crude oils compared with polar oil due to the stronger interactions between silica surface and polar oil. This investigation could accelerate the application of hydrocarbon gas flooding in deep reservoirs.
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