Load Evaluation And Transformation Optimization Design Of Oilfield Water Injection Pipe Network System

As the oilfield development enters the late stage of high water cut,many of the polyflooded wells built in the early stage have become water-flooded wells,making the pipe network structure more and more complex,and the distribution of high and low pressure wells becoming uneven.As a complex and connected topological network structure,the water injection pipe network system adopts the principle of "high or low" in order to meet the injection requirements of individual high-pressure wells,which makes the energy consumption loss of the water injection pipe network system too large.The continuous decline of water injection has caused the pressure of the pipe network of the water injection system to continue to rise,which seriously affects the water injection efficiency,and it is urgent to optimize and transform it in order to meet the actual production needs.According to the above problems,this paper studies the partial pressure and pressure reduction of the water injection pipe network system of an oilfield.Firstly,by analyzing the process flow of the water injection system and the current status of the water injection system,a transformation scheme of zonal partial pressure is proposed,and the two partial pressure models of energy consumption and cost are established as the objective function,and the improved genetic algorithm is used to calculate and analyze the model,and the critical value of partial pressure is obtained as the limit of its partial pressure.The basic hydraulic components of the water injection system were analyzed by simulation technology,and various evaluation models of energy consumption analysis of the water injection system were established,and the multi-dimensional data such as the geological injection pressure,the injection pump pressure and the throttling loss of the wellhead valve group,as well as the load rate of the water injection station and the operation of the water injection pump were analyzed in detail.In addition,the load rate of the water injection station is calculated by the mean value method,and then the water injection station reduction technology is used to reduce the water injection station of the oilfield water injection pipe network system,which improves the water injection efficiency of the water injection station.The least squares method and the improved BP neural network were also used to fit the characteristic curve of the actual operation of the water injection pump,and a control analysis was carried out.Through the technical analysis of the optimal working conditions of the water injection pump,the joint working operation characteristics of various combinations of pumps in the water injection station were effectively discussed,the operation efficiency of the water injection station was improved,and then the water injection pump was reduced and optimized by combining the characteristic curves of the water injection pump at all levels.Using the K-means clustering algorithm,the optimal layout of well stations in high and low pressure well areas was scientifically discussed,and the connectivity of the pipe network system was verified and analyzed.The results show that the zonal pressure division scheme proposed in this paper is feasible,and the energy consumption and cost partial pressure model established by case analysis is used as the objective function,and the critical value of partial pressure of the water injection system can be scientifically calculated by the genetic algorithm calculation method,which has certain general significance.By using the least squares method and the improved BP neural network,the actual operating characteristic curve of the injection pump can be effectively fitted,which provides a scientific way to explore the actual operation status of the water injection pump.In this paper,the calculation method of determining the optimal layout of well stations by using clustering algorithm has certain significance for the transformation of the pipeline network of oilfield water injection system.Through the load analysis of the water injection pipe network system,and then the implementation of the nuclear reduction technology of the water injection station and the reduction transformation of the water injection pump,the operation efficiency of the water injection pipe network system can be greatly improved and the overall energy consumption loss can be reduced,which has certain economic benefits.