The Action That Viscoelasticity Of Polymer Solution On Enhancing Oil Displacement Efficiency

Rheological properties and rheological properties that flow through porous media of polyarylamide(HPAM) solution and xanthan gum solution were analyzed and contrasted by the numbers through experimental studies on rheological properties of polymer solution and percolation flow properties that flow through porous media and rheological properties that flow through porous media. HPAM solution was considered to have properties of viscoelastic fluid, it is viscoelastic fluid, xanthan gum solution is viscoelastic fluid that have storage modulus and have not primary normal stress difference or low primary normal stress difference. Factors that affect rheological properties of polymer solution were analysed, through the analyses we can know that solution concentration, salinity of confected water, temperature, core permeability and molecular weight of polymer all affect rheological properties and percolation flow properties of polymer solution.Through analyses and contrasts of lab simulated displacement experiment and microcosmic simulated displacement experimental results, mechanism that viscoelastic polymer solution how to enhance oil recovery ulteriorly were perfected, corresponding relationships between polymer solution viscoelasticity and enhanced magnitude of displacement efficiency were got quantificationally.Rheological properties of polymer solution and xanthan gum solution were measured using rheometer, through analyses and contrasts on the testing results, we can know that solution concentration, salinity of confected water, temperature and molecular weight of HPAM all affect rheological properties of polymer solution.Dynamic testing experiments on HPAM solution and xanthan gum solution were carried out, through the experimental results we can know that two kinds of solutions both have loss modulus and storage modulus. At the same time, solution concentration , salinity of confected water, molecular weight of HPAM all affect loss modulus and storage modulus of solution. Stress relaxation experiments were described using Maxwell model and changes that relaxation time changed with angular frequency were calculated, through the calculated results we can know that difference of relaxation time between HPAM solution and xanthan gum solution is small at the condition that angular frequency is same.Elastic effect of HPAM solution can be tokened commendably using primary nomal stress difference. Bigger primary normal stress difference, bigger the elastic of solution, and solution concentration, salinity of confected water, temperature, molecular weight of HPAM all affect primary normal stress of solution.Experimental analyses and studies on percolation flow properties and rheological properties that polymer solution flow through porous meida were carried out. Relationship curves between injection rate and pressure drawdown were drawed through measuring pressure difference at both ends of core at different injection rate. Through percolation flow property curves we can know that percolation flow curves of HPAM solution are upswept but percolation flow curves of xanthan gum solution are downbent, two kinds of solutions behaved different percolation flow properties. Through rheological property curves of polymer solution that have been drawed we can know that apparent viscosity of HPAM solution increase with the increase of shear rate, but apparent viscosity of xanthan gum solution minish with the increase of shear rate, this explained that rheological properties are different between two kinds of solutions ulteriorly. At the same time we found out that solution concentration, salinity of confected water, temperature, core permeability and molecular weight of HPAM all affect rheological properties of polymer solution and percolation flow properties that flowthrough porous media, salinity of confected water affect percolation flow properties and rheological properties of xanthan gum solution a little.Rheological property curves and rheological property curves that flow through porous media of HPAM...