A Study Of Polymer Flooding In Second Type Oil Layers Reservoirs Of The Eastern Part Of Nan Jiu Block

By using polymer flooding method,the major reservoirs has acquired betters effect in DaQing oilfiled.The efficient development of second type oil layers reservoirs plays an essential part in the sustainable and effective development of oilfield.Through a mass of theoretical study,laboratory test,and field experiment,I have learned the recovery rule of polymer flooding in second type oil layers reservoirs and technical and economic limits.the tertiary oil recovery of second type oil layers reservoirs is tending toward perfection.the eastern part of Nan Jiu Block of DaQing oilfield was taken as the field experiment of polymer flooding in second type oil layers reservoirs,now the field experiment has achieved excellent effect,in the meanwhile,it demonstrates the feasibility of polymer flooding in second type oil layers reservoirsThis paper mainly discusses the research on flooding layer system for S ? 7-8 and 10-12 oil two kinds of polymer,the uniform well,five spot pattern to design a set of 175m from wells,493 oil and water wells were designed,including 263 producing wells and 230 water injection wells.Through the analysis of the geographical conditions,the oil layer structure characteristics of petrophysical property,fluid properties,reservoir sensitivity analysis and reservoir pressure,sedimentary type,the block meets the basic conditions of oil production by polymer flooding.The test shows that the two kinds of reservoir area and industrialization block development effect,two kinds of polymer injection after injection with high speed,through data simulation,in the condition of the well spacing of 175m achieved better precipitation increasing oil and the effect of polymer flooding.The development effect of the test area and the industrial block provides the basis for the combination of the two types of reservoirs in the western area of and the well pattern deployment.After determining the upper layer system of polymer flooding,the reasonable injection production well spacing is determined by the design of well pattern.In the initial stage of development,the optimization of injection parameters,the reasonable control of injection pressure and the amount of polymer,effectively control the water cut of the block,the effect of oil increasing is obvious,and good exploitation benefit has been achieved.