Research On The Adjustment Method Of High Concentration Polymer Flooding In The Middle Block Of The South One

By the end of August 2016,the average oil production of the polymer flooding in themain oil layer of the middle block of the middle block of Daqing oilfield was 1.6T,and the water cut was 98.5%.The block was inefficient and the invalid cycle was serious.According to the relevant stable production idea,the two oil layer three oil recovery development is carried out after the three oil recovery of the Portuguese I 1~4 oil layer after three oil recovery.That is,the polymer flooding is used in the lower return Portuguese I 5~ Portuguese II 10 two oil layers in the middle block of the South one,and the production capacity construction is implemented in 2017,and the polymer is injected in December 2017.In view of the development of the two types of oil layers in the middle block of the south one area,there is a certain area of distribution on the plane,and a certain thickness and reserves are distributed in each of the oil layers in the longitudinal direction.In order to further improve the recovery and ensure the development effect of the two types of oil layers,the geological characteristics of the block,the sedimentary characteristics and the current development status are analyzed,and the two types of oil layers are three.The combination of secondary production interval,adjustment potential of first stage,adaptability of injection production pattern and polymer flooding scheme are studied.