Research On The Percolation Characteristics And Oil Displacing Performance Of Salt-resistance Polymer

The percolation characteristics and oil displacing performance of salt-resistance polymer,BH-1 and KY620,was studied in this paper.The esistance coefficient and residual resistance coefficient of polymer was detected.The rheological properties and injectivity of the polymer were evaluated in porosity medium.The viscoelasticity and oil displacement efficiency were also evaluated in simulating irregular well pattern model.The law that concentration,permeability and formation water salinity influence injectivity of the polymer was discovered.The esistance coefficient and residual resistance coefficient increased with polymer concentration higher and decreased with permeability and formation water salinity higher.The cores will be blocked when permeability was less than 50×10-3μm2.The difference of rheological properties was found when polymer flew in porosity medium and rheometer.The viscosity of polyer resolution decreased firstly,then increased with shear rate in porosity medium.In rheometer,the viscosity of polyer resolution decreased with shear rate,and stable finally.The law that concentration and formation water salinity influence viscoelasticity of the polymer was discovered.The storage modulus,loss modulus and first normal stress difference increased with polymer concentration higher.The effect of salinity on viscoelasticity is weaker in low frequency region and stronger in high frequency region.It is proved by test that polymer BH-1 has more salt-resistance than KY620 polymer.Optimization polymer flooding injection scheme was obtained by oil displacement efficiency evaluating test.The primary recognition about injection-production performance of polymer flooding in irregular well pattern was obtained too.