Adaptability Research On Chemical Flooding Experiment In Sub-layers In DX Block Of Sa-H Development Zone In Daqing Oilfield

Daqing Oilfield has entered the development phase of high rate of water content, and since mining difficulty increases every year, water flooding has been unable to meet needs of production. With development is deepening, tertiary oil recovery is becoming an important technological method in maintaining the sustainable development of the oil field and enhancing oil recovery. The polymer flooding technology has formed large-scale production, and the displacement object of polymer flooding has gradually turned to sub-layer. The DX Block of Sa-H Development Zone is a sub-layer polymer flooding block, as there is a large difference between all layers, if the same molecular weight injection is adopted, it would lead to uneven oil suction profile and more contradictions between the layers so that most polymer solution in some of the wells would press onward the high permeability layer and the middle and low permeability layers have not been effectively utilized. Therefore, we need further research and analysis of this problem.In this paper, the analytic target is DX block of Daqing Oilfield. According to its oil layer physical parameters, the author conducts an experimental study on the chemical flooding of DX block. Which bases on laboratory tests of reasonable matchings between different polymers and oil layers in this block and the impact of different slugs on oil displacement and other tests, combined with the experience of site development, to develop the best oil displacement methods in DX block. This paper suggests to classify the injection wells according to their oil layer developments and group intercommunication conditions, in order to achieve personalized designs for single-well injection parameters, injected concentration and injection solutions, so as to further excavate potentials of oil layers, enhance oil recovery, and have a better understanding of polymer flooding technology.Test results show that:This study will effectively improve the level of use of middle and low permeability oil layers and better control the picking up speed of water on the block to provide a better theory and basis for chemical flooding technology and gives instructions to further development of oil fields.