Development Effect Research On Water Flooding And Polymer Flooding Working Together In Second Type Reservoirs Of Sa Ertu Oilfield

After nearly 50 years of development, Daqing oilfield has came into the late high water cut. polymer flooding has formed a mature program design method and showed the good effect of enhanced oil recovery. but with the main reservoir polymer flooding decreases in inhance reserve potential, begin to consider the relative poor conditions second type reservoirs for polymer flooding, achieve polymer flooding production succeed. Because of its characters,the method of layer combination is different from the main layers,combined with tertiary infill drilling,There must be polymer and water flooding working together in second type reservoirs. So find the best polymer and water flooding working together technical limits and adjustment method will directly affect development effect of the second type reservoirs and tertiary infill drilling in the second type reservoirs exploitation process Determine the reasonable exploitation of second type reservoirs, coordinate the reasonable polywater ratio of polymer and water flooding working together region both sides, reducing the mutual influence of water polymer flooding is a important solved problem which to improve development effect of polymer and water flooding working together in second type reservoirs.So far, various polymer development process of second type reservoirs are described in many literature,but the literature about polymer and water flooding working together in second type reservoirs is very little, especially some important parameters about polymer and water flooding working together have been a problem.In macroscopic aspect ,polymer solution can improve the mobility ratio ,enlarge the sweep volume and microscopic aspect ,the visco-elasticity can improve the sweep efficiency.According to those two aspects, visco-elastic polymer mathematic modle has been set up in this paper.At the basis of this model carried out simulation research of two major categories of the main injection and production connectivity relationship in second type reservoirs of North II West Block by numerical simulation technology. Exploitation characteristics of polymer flooding region and water flooding region and polymer-water flooding contact region and all region were studied in the different injection parameters of polymer and water flooding working together of second type reservoirs. Findings show that when existing polymer and water flooding working together, using reasonable injection-production connected relations and the best injection parameters can mostly reduce the disturbance between polymer flooding and water flooding to reach the purpose of enhanced oil recovery.