| Unfavorable mobility ratio is a major concern in oil recovery processes; polymer flooding has been proved efficient in obtaining a favorable mobility ratio by increasing the viscosity of water phase. Due to the low tolerance to salinity and temperature of regular polymers, associative polymers with improved characteristics have been developed. In this thesis, an associative polymer, Superpusher C319, is studied and compared with FLOPAAM 3330S, selected as a Partially Hydrolyzed Polyacrylamide polymer for its frequent use in chemical designs. The rheological behavior of these two polymers and their effects on mobility ratio, polymer adsorption and permeability reduction in porous media are investigated. Five coreflooding experiments using different concentrations of Superpusher C319 and HPAM were conducted with Minnelusa and Berea plugs, respectively, using TC oil under high pressure and temperature conditions. The optimal concentration of the injected Superpusher C319 in experiments, which leads to the maximum oil recovery, is calculated based on mobility control. History matching (HM) using CMG-IMEX is conducted to obtain relative permeability curves. In addition, NMR is successfully used in determining polymer adsorption in the porous media. Compared to HPAM, Superpusher C319 is less sensitive to salinity and temperature, and it increases the viscosity of displacing phase more efficiently.;Experiments are conducted to test the influence of temperature, pH and addition of metals on the rheological behavior including elastic and viscous modulus of Colloidal Dispersion Gels. Strain and stress controlled experiments are performed with TA Instruments ARES rheometer. |
