Application and Structure of Multistage Separated Injection Equipment of Surface Control

The reservoirs in Dagang south oilfield is multi-layer and conflict between layers.In order to improve injection efficiency and production degree of low permeability reservoir,and realize multistage separate injection,the plug-in surface separated injection technology and concentric dual-barrel separated injection technology were developed and applied in five wells in south-oilfield,which proved that the pilot test was effective.The results of test showed that the matching technical level of separated injection was improved and some difficult technology problems of deep well,high injection pressure,condensed oil,scaling and great difficulty of pulling and running for water injection allocation can be solved using the surface multistage separated injection technology.