Injection High-concentration Polymer Flooding To Improve Oil Recovery After Polymer Flooding Research

Polymer flooding is an effective method to improve recovery. It mainly reduce the mobility ratio of water and oil phase by improving water phase viscosity and reduce water phase permeability, so as to enlarge sweep volume. But there is still have a lot of residual oil underground after polymer flooding, these remaining reserves have huge potential for increase recoverable reserves and improve oil recovery. The study of remaining oil distribution features after polymer flooding shows that the remaining oil after polymer flooding of heterogeneous reservoir mainly distribution in middle and low permeability reservoir heterogeneity reservoir and injection-production well away from the wings of the mainstream line area. So for serious reservoir heterogeneity, it plays a very important role to further improve oil recovery for increase the use of middle and low permeable reservoirs after polymer flooding.Summary total5of industrialized polymer flooding in xingbei development zone block, as each block enter into late polymer flooding stage eventually, block water rebounded gradually speeding up. Coring and producing status information indicates that within the layers, layer effects and a flat contradiction, polymer flooding reservoirs within45%per cent of the reserves have not been used, three types of reservoir in tertiary oil recovery potential is not yet clear. In order to improve the development effect of polymer flooding in late, try to late polymer flooding block high-concentration polymer modified, research reserves further Eor after polymer flooding technology, in xinbei development zone sustainable stability and providing technical support.Based on field actual demand, in this paper, with reference to injection scheme adjustment principle, through study the degree of injection-production perfecting, reservoir development status of injection well and injectivity of high concentrations of polymer injection well group, improve the method of selecting well of high concentration polymer flooding, to provide a reference basis for carry out the change note high concentration polymer flooding wells of other polymer flooding block.