Capacity Model Of Different Well Types In Stratified Seam Reservoir And Study On Well Network Optimization

The development of fractures is of great significance to the accumulation,enrichment and production of tight oil.Bedding fractures are commonly developed in tight oil reservoirs and are the main storage space and seepage channel for tight oil.Based on the research on the seepage characteristics of the bedding fracture reservoir,this paper establishes a productivity prediction model suitable for the bedding fracture reservoir,and conducts an optimization study on the well pattern deployment of the bedding fracture reservoir and the development of specific bedding fractures.The reservoir gives the well pattern optimization scheme.On the basis of the bedding fracture seepage characteristic experiment,combined with the field production situation,the bedding fracture permeability was determined as the main controlling factor of productivity.Combined with the seepage characteristics of the bedding structure,the bedding fractured reservoir is equivalent to an anisotropic reservoir with horizontal permeability and vertical permeability by using the equivalent seepage resistance method.Using the modified skin factor,an analytical model is established by combining the vertical well formula and the horizontal well formula;the semi-analytical model is established by coupling formation seepage and wellbore flow.After co MParing with the actual production data,the results show that the semi-analytical model can accurately predict the productivity of reservoirs with bedding fractures,and provide guidance for the efficient development of bedding fractures.On the basis of the equivalent permeability calculation,the semi-analytical model is used to calculate the production data of different well types in the reservoir with bedding fractures.The results show that the long horizontal well has the best production effect in the reservoir with bedding fractures.Taking productivity and comprehensive recovery as the optimization goals,the embedded discrete fracture simulation method is used to carry out well pattern optimization research in bedding fracture reservoirs.The research results show that the development effect of vertical well + horizontal well is the best.The research results of this paper clarified the effect of bedding fractures on low permeability reservoirs,established a new method for predicting the productivity of bedding fracture reservoirs,and gave a well type optimization and well pattern adaptation method for bedding fracture reservoirs.The development of fractured reservoirs has certain guiding significance.