Abstract
Abstract In this paper, the rheological characteristic of HPAM solutions is studied and the oil displacement efficiencies of viscous-elastic HPAM solutions (concentration in series) and viscous glycerin solutions (no elasticity, viscosity in series) are studied by flooding at visual microscopic glass models and artificial cores. Also, the effect and mechanism of the viscous-elastic behavior of HPAM solutions and glycerin solution on the displacement of residual oil films under mixed wettability conditions is studied, the relationship between the elastic behavior of HPAM and oil displacement efficiencies is given. The results of rheological characteristic measurement indicate that both the viscosity and the first normal stress differential (<i>N</i>1) of HPAM solutions increase with the increase in concentration, HPAM solutions show strong viscous-elastic characteristics under high concentration conditions. The results of microscopic oil displacement experiments indicate the displacement efficiencies of HPAM solution flooding and glycerin solution flooding gradually increase with the increase in the viscous-elastic behavior of HPAM solutions and the viscosity of glycerin solutions. However, for HPAM solution flooding, the displacement efficiency is always higher and residual oil saturation lower than that of glycerin at the same viscosity and same capillary number. Last, the displacement experiment in artifical cores is conducted and the similar resultes are validated.
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