Water Injection Pipe Network Optimization And Leakage Diagnosis

As most of the domestic oil fields enter the high water content development period,the water injection demand increases dramatically and the power consumption also rises sharply.At the same time,the operation of the water injection system is becoming more and more complex,requiring frequent adjustment of the operation scheme and operating parameters to meet the changing requirements of water injection in different periods.Therefore,the optimized operation technology of oilfield water injection system is important to improve the operation efficiency of the system and reduce energy consumption to realize the efficient operation of oilfield.The water injection pipe network system is a complex multi-stage composite fluid network system,and the investment design of the water injection pipe network system accounts for 40% of the total investment in water injection engineering infrastructure construction.Because the pipe network is buried underground for years in a very harsh operating environment,it is easy to corrode the pipe from the outside,resulting in leakage,thus wasting a lot of water resources and reducing the efficiency of system operation.Based on the above reasons,this paper takes oilfield water injection system as the research object,and establishes corresponding mathematical models and optimization models according to the actual problems and compiles corresponding simulation calculation modules and optimization software from the aspects of simulation calculation of surface water injection pipeline network system,leakage accident of pipeline network,efficiency of water injection station and optimization of pipeline network system.Taking oilfield water injection system as the research object,the simulation calculation model of water injection system is established according to the theory of fluid mechanics and energy conservation,and the Newton iterative method is used to solve according to the characteristics of the water injection pipe network model,and whether the simulation calculation meets the actual engineering needs is analyzed through the calculation of actual cases.Since the water injection network is buried underground all year round and operates in a harsh environment,leakage accidents occur from time to time.In order to diagnose leakage accidents in oil fields,this paper establishes a leakage location model based on the enumeration method with the minimum sum of squares of the difference between the calculated pressure and the measured pressure at the pressure monitoring point as the objective function,and conducts simulation to verify it.Combined with motor frequency conversion energy saving technology and speed regulation theory,to achieve optimization of single pump operation parameters.With minimum energy consumption of the water injection system as the optimization objective,genetic optimization algorithm is applied to determine the joint operation parameters of multiple centrifugal pumps in the water injection station,and to satisfy the optimization of pump start-up schemes for the same and different models of centrifugal pump sets.Provide a variety of plunger pump combination schemes and make preferential selection based on the principle of minimum total power to provide a decision basis for plunger pump modification in water injection stations.To optimize the topology of the pipeline network with the goal of minimizing the construction cost by minimizing the connection pipeline between the water distribution room and the injection wells.Meanwhile,in order to improve the efficiency of the pipeline network,global optimization and local optimization methods of the pipeline network are proposed.The integer coding hybrid genetic optimization algorithm is used for global optimization,while local optimization provides an economic and effective method for daily maintenance and renovation of the pipeline network.Finally,based on the above theoretical basis,the Visual C++ language programming technology was used to compile and complete the water injection system efficiency evaluation software.Through a series of example calculations,the feasibility of the software was verified,providing a solution for the dynamic and intelligent evaluation of the daily operation efficiency of the oilfield water injection pipeline network and the implementation of energy-saving and consumption reduction measures.