Research On The2nd Phase Chemical Flooding Numerical Modeling In The Central West Region Of SZ After Tertiary Infilling And EOR Technology

Now the polymer flooding in type I reservoir of Daqing oil field is coming to an end, The object of tertiary oil recover gradually into typeⅡand Ⅲ reservoir,due to big difference between layers and low permeability, poor thin layers have a poor adaptability to the high molecular weight polymer.The use of the same molecular weight of polymer displacement, causing the difficulty of low permeability reservoir injection, low degree of use, affect the effect of polymer flooding development.In2000, we carried out three times encryption and tertiary oil recovery with field test in the central west region of SZ. In this paper, on the basis of knowledge obtain by pilot, With the application of petrel software, fine phased geological model is established, and set up a model that considering reservoir condition, permeability distribution, the connection of oil and water Wells, oil well spacing, sedimentary rule and the influence of the various measures and other factors.Geological reserves of simulation area fitting, and the production dynamic history is matching.Respectively analyzed of district and central currently remaining oil distribution features and the use of different reservoir conditions, And analyze the first issue of object, the second phase of the production index prediction, analyses the regularities of remaining oil distribution of the first phase and the second phase before fill hole and after the first and second phase object holes. Optimizing the object suitable chemical flooding mode, polymer concentration, object polymer injection rate, object polymer slug combination of the second phase.According to the result of optimization, respectively predicted the the improvement of oil recovery effect of first phase and the second phase after polymer flooding, the clustering drive ultimate recovery of the first phase is48.3%, the second polymer ultimate recovery can reach58.48%, the improved recovery value is10.18%. This thesis research results provided valuable experience for type in reservoirs.