Numerical Simulation on Dual Horizontal Well SAGD Multi-interlayer Steam Chamber in the Offshore Heavy Oil Reservoir

摘要

There are rich offshore heavy oil resource in this world,so it is of great significance to develop it.Now the current developing methods such as steam huff and puff have some disadvantages,this mainly reflected in the problems of low oil recovery.Steam assisted gravity drainage is an important technique for heavy oil exploitation.The influence of multi-interlayers act on steam chamber was studied in this paper and the topic has a strong theoretical significance.When the steam chamber encounters the interlayer,there will be a flow around and a difficult flow area will be produced.This phenomenon is further studied by using CMG numerical simulation software in this paper.The basic model is designed for the actual reservoir,and the influence factors of permeability,intercalation distance and interlayer quantity are in considered.Through this research,the mechanism of interlayers act on the development of steam chamber is clarified and the development of steam chamber is divided into seven stages.Due to the slower temperature transfer above the interlayer,as the production time increases,the upper part of the interlayer will become a difficult flow area.The more interlayers that are present,the more a difficult flow areas are formed.The position of the interlayer affects the cumulative oil production.The smaller the distance between the first interlayer and the cover layer,the higher the cumulative oil production.These can provide important theoretical basis and technical support for the development of reservoirs with interlayers.