Study On Optimization Of Injection And Production Adjustment Based On Differential Evolution

Water injection development is the main development method for China's oil fields.Injective optimization is an important means to improve the effect of reservoir development.In recent years,international oil prices have been sluggish.This research work is of great significance to the development of waterflood oilfields.Based on the results of numerical simulation,this paper studies the fluid distribution characteristics of the well point control range and forms the main control range split coefficient method.By studying the distribution characteristics of reservoir parameters,a method for merging small layer parameters based on weighted average was proposed.Based on the two-dimensional streamline simulation,a three-dimensional streamline simulation model was established by using the main control range split coefficient method and the simulation layer merger method.Relying on the simulated results of the quasi-threedimensional streamline,the distribution characteristics of the current flow field in the injection and production system are studied.Two evaluation indicators,the remaining oil control degree and water consumption index,for oil and water phases were established,and a rapid evaluation system for injection and production effects was formed.In view of the distribution characteristics of the current flow field in injection and production systems,an injection and recovery optimization mathematical model was established with the fluid volume of the oil and water well as the optimal variable,the remaining oil control degree as the main objective function value,the water consumption index as the auxiliary objective function value and the injection and production process as constraints.The principle of differential evolution algorithm was studied and new test schemes were generated through population initialization,mutation,and crossover operations.Combining the evaluation indicators of injection and production effects,a production scheme with high degree of control of remaining oil and low water consumption index was screened,and a rapid injection and production optimization method based on differential evolution algorithm was formed.The results of the study show that the quasi-three-dimensional streamline simulation model and the rapid evaluation method of injection and production effects have the advantages of fast calculation speed,high feasibility,and visualization.The differential evolution injection-production optimization method can quickly search for the best production volume of the production well and the optimal injection amount of the injection well at the current stage to achieve the purpose of rapid optimization of the injection and production scheme.The above theory was applied to the injection and production adjustment of the fault block tuo 11 reservoir,and a corresponding quasi-three-dimensional streamline simulation model,a rapid evaluation system for injection and production effects,and an injection and recovery optimization mathematical model were established.And using the differential evolution algorithm to solve the mathematical model to obtain the best injection and production fluid volume of the current injection and production system oil,and using the reservoir numerical simulation to verify the reliability and high efficiency of the method.