Research On Improving Polymer Flooding Development Effect Of The Second Reservoirs

The target of this research is further improving development effect of the second type oil layers. On the basis of macroscopic recognizing geology characteristics of the second type oil layers, the geology characteristics of the second type oil layers which is different from main layers are analyzed from development scale of channel sand, drilling footage of channel sand, permeability stage differential, coefficient of permeability variation and advance suddenly coefficient and so on. Applying the actual datum on location of polymer flooding blocks in the second type oil layers and the main layers and the datum of the sealing core drilling wells, the exploitation characteristics of polymer flooding in the second type oil layers are analyzed and the main contradiction in the process of polymer flooding in the second type oil layers is clear. For the main contradiction in the process of polymer flooding in the second type oil layers, the problems of separate quality polymer flooding, polymer-water flooding in common, overall system adjustment and how to improve the polymer flooding control degree of channel sand and so on are researched thoroughly and carefully through applying numerical simulation, physical simulation and dynamical analysis methods. The adjustment methods of improving development effect in the second type oil layers are further advanced.