Study On Pressure Gradient Variation And Displacement Of High Concentration Polymer Flooding

This article studied the alternation rule of pressure gradient among pressure events with high concentration polymer flooding and influence on displacement characteristics. Also on the high concentration polymer flooding system stability, viscoelasticity and flow parameter in porous media are studied, The study considered the influence of gradient concentration, molecular weight of polymer and formation permeability on pressure gradient among pressure events. And observed the alternation rule of displacement characteristics under the condition of different polymer concentrations, molecular weight s and formation permeability comprehensively. We thus conclude that pressure gradient among pressure events increased with increasing gradient concentration and molecular weight and decreasing formation permeability and decreased with adding the distance away from injection side.We can draw following conclusion in recovery, Comparing with water flooding Polymer flooding can enhance producing gradation of low permeability layer and enhanced oil recovery under the condition of heterogeneous rock core; Increasing polymer concentrations result in raising swept volume and displacement efficiency, chemical flooding recovery and overall recovery efficiency under the condition of heterogeneous rock core; water flooding recovery and chemical flooding recovery changed little with the same usage of polymer, and the overall recovery efficiency increased a little; the overall recovery efficiency increased adding molecular weight of polymer with the same usage of polymer. The study and recognition provided practical application with theoretical base, and had a bit of directory significance.