Study And Application Of Subsequent Water Flooding And Injection Increasing Technology For Polymer Injection Wells

Polymer oil displacement is an improved water flooding method,which uses polymer as additive.Polymer solution increases the viscosity of water,improves the flow ratio of water oil,and increases the water flux coefficient.Polymer flooding is an improved water flooding method,which uses polymer as an additive to increase the viscosity of water,improve the flow ratio of water oil,and increase the ripple coefficient of water injection.After the injection of water flooding in Sheng Li Oilfield,good development results have been achieved.The difficulties of water injection in the following block of many injection blocks,such as Sheng Li,Estuary and Dugong,have been revealed continuously.Based on the research and application of pressure relief augmentation technology for water flooding following injection condenser well,this paper analyzes the main blocking materials,distribution patterns and the distribution of the blocking materials in the pore and throat channels to determine the main components of the blocking materials.In order to solve the problem of polymer clogging,a suitable system of mild demulsifier was selected according to the characteristics and damage mechanism of the injection well.This study has completed the analysis and study of the plugging mechanism of polymer injection-water transfer flooding wells and found the main reasons,and optimized the appropriate mild depolymerizing agent.In view of the current situation of polymer injection wells in Sheng Li Oilfield,this paper optimized the on-site plugging removal mode,construction parameters,optimized the appropriate plugging removal and injection enhancement technology,and evaluated the construction effect.After the implementation of this study,the injection efficiency of polymer injection wells to underinjected wells has increased significantly,and the number of operations has decreased,which can produce good economic and social benefits.