The Evaluation Study On High-concentration Polymer Solution’s Viscoelastic Behaviors

In this paper,we has done the indoor physical simulation experiments about EOR of thehigh molecular weight anti-salty polymer on artificial anisotropic core and natural core.It hasadjusted and analysed the viscoelastic action and mechanism that the high concentrationpolymer solution have，and it will have conducted more thorough research and understandingthrough the angle of the theoretical analysis，viscoelastic angle，macroscopic angle，microcosmic angle and oil/water viscosity ratio to the rheology behavior of high molecularweight anti-salty polymer solution，macroscopic swept volume，microcosmic cleaningefficiency，the viscoelasticity influence role which plays to the water/oil viscosity ratio.Also ithas carried on the fumble through the experiment to the resisted shearing capability of thehigh molecular weight anti-salty polymer and the flow capacity in the oil layer.The paper findings indicated that:When the high molecular weight anti-salty polymerenhanced the unit concentration,the viscoelasticity enhanced the value to present the peakvalue,the viscoelasticity namely presented the sudden change.Each parameter thatcharacterize resilience increased along with the increasing of the concentration that the highmolecular weight anti-salty polymer had.The anti-cutting ability of the high molecular weightanti-salty polymer solution is quite strong,the degeneration rate is bigger along with thecutting time’s increasing when the solution concentration is bigger,but the retention viscosityis also bigger.We filled the high molecular weight anti-salty polymer after the conventionpolymer flooding.When the solution concentration increased,the system’s viscoelasticityincreased, the crude oil and polymer solution’s ratio of viscosities reduced and the recoveryratio enhanced,moreover the displacement of reservoir oil effect of the steps and ladders plugsurpassed the whole plugs.Through understanding which obtained in this article as well as the research,it has quitevital significance for us to understand viscoelastic polymer solution’s oil displacementmechanism maximum limit,instructs the working site to use polymer to drive moreeconomically and effectively and improve the basic theory of polymer flooding.