Research On The Identification Of Dominant Channels In High Water-cut Layered Unconsolidated Sandstone Reservoirs And Comprehensive Management Countermeasures

Layered unconsolidated sandstone heavy oil reservoirs are widely distributed all over the world.Due to interlayer heterogeneity and the influence of long-term water flooding development,the physical properties of the reservoir change,and dominant channels are formed in the formation,which reduces the sweep efficiency of injected water.In order to improve the development status of the reservoir and improve the development effect of water flooding,it is necessary to study the development characteristics,development parameters and formation mechanism of the dominant channels.The measures have guiding significance for improving the water flooding sweep efficiency of the reservoir and increasing the recovery degree.This paper makes full use of geological and development data,firstly analyzes the sand production mechanism of layered unconsolidated sandstone heavy oil reservoir,determines the main controlling factors of sand production by grey relational method,and explores the production performance of oil wells before and after sand production The change law of the stratified unconsolidated sandstone reservoir lays the foundation for the identification of dominant channels;through fuzzy comprehensive evaluation method,multi-information inversion method and reservoir engineering decision-making,etc.The formation mechanism,development parameters,and development model were studied,and the dominant channels were divided into three levels: complete,developed and natural.The optimal well pattern adjustment and injection-production structure adjustment methods were established,and a mechanism model was established to determine the optimal technical policy boundaries,and they were applied to actual oil reservoirs to achieve the purpose of improving the development effect of the reservoir.