Crude oil production is still considered a significant contributor to global energy security. To improve oil production, gases such as CH4, N2, Air and CO2 are injected into oil reservoirs in a process called gas Enhanced Oil Recovery (EOR). Authors have used several engineering, geological and geometrical quantities to characterise oil reservoirs and evaluate immiscible gas EOR processes. Viscosity is one of such critical engineering quantities. However, the relationships between viscosity and structural parameters, such as porosity, pore size, and aspect ratio, have not been directly investigated in the literature. This paper investigated the coupling effect of pressure and structural parameters on the apparent viscosity of EOR gases in reservoir pore matrix through rigorous data mining and experimental approaches. The data mining analyses demonstrated that EOR reservoirs are characterised by viscosity and porosity. The experimental investigation indicated that the viscosity of injected EOR gases increases with pressure and pore size, decreases with porosity, and initially decreases before increasing with aspect ratio. The study concluded that CO2 is the most influenced by porosity, and CH4 is the least. Furthermore, N2 is the most responsive to pore size and aspect ratio, while CH4 is the least responsive.
ABUNUMAH, O., OGUNLUDE, P. and GOBINA, E. 2021. The effect of pressure and porous media structural parameters coupling on gas apparent viscosity. In 2021 TUBA (Turkish Academy of Science) World conference on energy science and technology (TUBA WCEST-2021) book of abstracts, 8-12 August 2021, [virtual conference]. Ankara: Turkish Academy of Sciences [online], pages 88-89. Available from: https://doi.org/10.53478/TUBA.2021.017