The Study of Polymer Flooding Seepage Flow's Law in Xinjiang Oilfield

Because plenty of polymer are added in the surface/polymer flooding' solution, surface/polymer flooding' solution has a higher permeability than water flooding. So when surface/polymer flooding' solution flow in the stratum, its threshold pressure gradient is an important influence factor. According to study surface/polymer flooding' solution in different viscosity flow in some cores with different permeability, get the variation law of surface/polymer flooding' solution's threshold pressure gradient. The result of the study show surface/polymer flooding has the obvious threshold pressure gradient. The threshold pressure gradient of surface/polymer flooding has a relationship to viscosity of the solution and permeability of cores. The viscosity of the solution is bigger, and permeability of cores is lower, threshold pressure gradient of surface/polymer flooding is higher. Based on the formula of nonlinear porous flow, the yield formula for calculating the 5-spot well pattern were deduced by using the flow line integral method and element analysis method.