Study On Regulation Model Of Multi-Layer Fault Block Reservoir In Ultra-High Water Cut Stage

After years of water drive development,most fault block reservoirs in China have entered an ultra-high water cut period.In a certain block of L oilfield studied in this paper,the problem of interlayer interference still exists in the high water cut stage after layer series reorganization,and the adaptability of injection production well pattern becomes poor.There is a great contradiction between the geological development standards of the existing multi-layer and non fault blocks.However,there is still an urgent need to classify and evaluate the main oil reservoirs according to the geological characteristics of the multi-layer and non fault blocks,but there is still a contradiction between the multi-layer and non fault blocks,There is a lack of classification and evaluation methods for interlayer development contradictions in multilayer fault block reservoirs,as well as development countermeasures and policy boundaries to solve interlayer contradictions.Firstly,based on the grey correlation method and K-means cluster analysis method,this thesis re divides the block types of multilayer fault block reservoir,gives the division boundary of each type of block,and establishes a set of analysis method of block classification of multilayer fault block reservoir.On this basis,the new waterflooding curve in ultra-high water cut stage and flow tube method are applied to predict the water drive limit sweep coefficient and limit recovery of various types of fault block reservoirs,and the residual production potential of various layers of multi-layer fault block reservoirs in ultra-high water cut stage is clarified,which lays a foundation for the subsequent research on improvement mechanism and policy boundary optimization.Based on the results of layer block division,four kinds of water injection development countermeasures after layer series reorganization are designed,and based on this,threedimensional physical large plate model experiments of different reservoir types and microfluidic displacement model experiments considering different water injection development countermeasures after layer series reorganization are designed to explore the remaining oil production effect and distribution law of various fault blocks under various development modes,The distribution of remaining oil is quantitatively characterized,so as to clarify the action mechanism of different development countermeasures of multi-layer fault blocks in ultra-high water cut stage.Finally,by means of reservoir numerical simulation,on the basis of improving the well pattern,this thesis quantitatively analyzes the development effect of different fault block types with different injection and production methods,continues to study the optimal policy limits of different fault blocks under the optimal injection and production methods,and finally determines the technical adaptability and policy limits of different types of reservoir blocks.