Research On The Compatibility Of Different Polymer Flooding Slug Combination In Second-class Reservoir

At present Daqing Oil Field development result demonstrate that most of remaining oil mailly inside low seepage rate reservoir. It is particularly important to understand the regularity of polymer flooding as polymer scale of second class reservoir in Sazhong Development Zone continues to expand, it is experienced one after another process after second class reservoir put into production,from the normal density and clear water polymer to high molecular weight and sewage polymer to middle molecular weight and clear water polymer flooding ,recognized that the single slug can no longer satisfy the second class reservoir development. So to the second class reservoir,this paper study on experimental research.The effect of water flooding is decided by the heterogeneity of oil layer and fluid property to a great extent, but the effect of the polymer flooding is also decided by polymer loading, viscosity, molecular weight, injection time and so on. If we consider weakly, it will affect the effect of the polymer flooding greatly and reduce the economic efficiency.Therefore this article has in view of geologic condition of second class reservoir, research about the compatibility of different polymer flooding slug combination in second-class reservoir with flooding into four different permeability core. To evaluate the compatibility of different polymer flooding slug combination in second-class reservoir through pours into the different molecular weight, the different configuration method and the different density. The results shows that the combination of different slug is better than a single slug injection, the best is middle molecular weight and sewage and 1500mg/L polymer at first,and then high molecular weight and clear water and 1500mg/L polymer.