Predicting Natural Gas Viscosity with a Mixture Viscosity Model for the Entire Fluid Region

Abstract

A new predictive corresponding-states mixture viscosity model for the entire fluid region and large range of temperature and pressure is reported here. Using previously published parameters for pure n-alkanes, viscosity predictions with this model were made for the methane–ethane system and twelve component Qatari synthetic natural gas mixtures. For the synthetic natural gas mixtures studied, the new model presented here has comparable predictability to other literature models and superior predictability at higher (11 mol %) levels of N2 and CO2 content. The integral use of the PC-SAFT equation of state with the fluid mixture viscosity model introduced here provides an attractive unified approach for modeling flow in porous media.