Abstract:Based on description of the rheological characteristics of ASP combination flooding formation fluid using the constitutive model of viscoelastic fluid, the basic differential equations of flow of ASP reservoir fluid in porous medium were established and numerically calculated using finite differential method, on the works of above mentioned, the productivity of ASP oil well was forecasted using Lagrange interpolation method, the rheological parameters which affected productivity of ASP oil well were analyzed in this paper. By means of relative analysis of the results of theoretical arithmetic and the measured data of 5 oil wells of the forth oil recovery factory in Daqing, the percentage of error is less than 20%, the results indicate that the method using rheology of ASP reservoir fluid which is described using viscoelastic fluid constitutive equation model can predicated productivity of ASP oil well very well.