Study of Different Gas Floodings on Minimum Miscibility Pressure and Oil Recovery in a Low-Permeability Reservoir with Medium Viscous Oil.

Although gas flooding has been successfully applied for enhanced oil recovery throughout the world, most of its applications are conducted in low, ultralow, and tight oil reservoirs with light oil. Studies focused on a low-permeability reservoir with medium viscous oil are rarely reported, and there is little experience in the development of this type of reservoir for reference. Based on the special characteristics of low-permeability formation coupled with medium viscous oil in Niuquanhu Block, China, the gas-oil interactions of different gases are first evaluated through the pressure-volume-temperature (PVT) analysis.