Study Of Inflow Performance Relation Of Polymer Flooding

IPR curve of oil well is not only the base of analyzing performance of oil well, But also the foundation of making work system for oil well. In the process of polymer flooding, the rheological property of formation fluid is changeable, produced fluid which contain polymer presents obvious non-newtonian property ,because of the effect of shear degradation,dilution,absorption,detention etc.So the ordinary model of inflow performance for oil well is not adapted for calculating inflow performance relation (IPR) of unstable flow of polymer flooding.In this precondition, it is very important to study inflow performance relation of oil well which the rheological parameters of formation fluids is changeable during polymer drive. Separately consider two cases of oil and water two-phase fluid flow,ploymer solution single phase fluid flow, this paper analyses different phases distribution of pressure, establishes forecast model of pressure distribution and inflow performance relation (IPR). It provides reliable foundation for the optimize of pump,rod,unit for polymer drive and the regulation of working parameters. The following is the main research content and result :1.This paper establishes mathematical model of the polymer solution flows through porous medium in the formation, it includes forecast mathematical model of single phase fluid flow and oil and water two-phase fluid flow. With this model, we can comprehensive describe nonlinearity filtrate law and complex rheological behavior of formation fluid of polymer drive in the process of fluid flow through porous medium, analyses rheological parameters affecting inflow performance relation, including consistency index and liquidity index.2. This paper establishes single well change in pressure mathematical model, it can calculates pressure distribution between injection well and production well, so we can establish inflow performance relation (IPR).3. In view of different phases of polymer drive, it establishes forecast model of pressure distribution and inflow performance relation (IPR).4. In the condition of steady percolation, this paper deduces the equation of inflow performance relation of power law fluid, it proved that IPR curve is concave up in the theory.