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Polymer flood which is one of enhanced oil recovery technology has been used for mobility control by injecting viscous polymer solution into the reservoir. Viscoelasticity of polymer solution contributes to increase in displacement efficiency of remaining oil. Since viscoelastic properties are affected by temperature, it is necessary to consider relationship between temperature and viscoelasticity for designing the polymer flood. Relaxation time is used as a major parameter to quantify the viscoelasticity of the polymer solution. In this paper, dynamic moduluses were measured using rheometer and relaxation time was determined using cross-over point method. Relaxation time showed positive correlation with polymer concentration and negative correlations with salinity (NaCl) and temperature. In addition, a correlation for estimation of relaxation time depending on temperature was suggested using WLF (WilliamLandel-Ferry) model.

han-guk jawon gonghak hoeji

Analysis of Relationship between Temperature and Relaxation Time of Polymer Solution depending on Polymer Concentration and Salinity for Enhanced Oil Recovery