| Abstract |
A comprehensive study is carried out on viscosity modeling for the geologic sequestration of CO2 in the pressure and temperature range 1-600 bar, and 20°-105° C, respectively. For the liquid phase we present viscosity models for pure water (H2O), brine (H2O+NaCl), H2O+CO2, H2O+NaCl+CO2, and typical sea water compositions. In each case, we attempted to develop very accurate formulations, but having fewer parameters than existing models for more efficient computation. Effects of dissolved CO2 are studied extensively. We have found that deviations can be 2-8% in liquid phase viscosity calculations if CO2 dissolution is neglected. In addition, a vapor phase model is also suggested. |