Inverse Study To The Structure Parameters Of Water System Models In Oil Field

During the course of calculations of simulation,pipe network's reconstruction and prameters optimization to the water systems in oil field,the pipe-net's foundation datas are all involved. These foundation datas are the base of the above calculations.At the same time,the pipe's datas we obtained from oil field usually are original design datas.In the construction,maintenance and reconstruction to the pipes.some datas are maybe different from original datas.Some difference are even very greatly.These differences may be corrected as long as we contrasted the real instances. But the more important is that some pipes come into being thicken wall,real internal diameter reducing and so on due to corruption and impurity precipitated in the operating course of tens years.These problems can lead to increase the resistance losses ,reduce the volume of flow etc and enlarge the calculation error.As a result, simulation,pipenet's reconstruction and optimization calculation will lose their original meaning. At the same time, we can't solve these problems by way of direct measurement.In accordance with the mentioned above circumstances,the dissertation develops the inverse study to the structure parameters of water system models in oil field.The dissertation sets up mathematical models of pipe networks to describe working status of oil field water systems. It also sets up unit equation based on pressure loss and general equation group of pipe network system based on flow balance principle of node. After analyzing characteristic of matrix and general equation group, reduction tactics of pipe network is developed. It is found out that iteration method is fit for computing the general equation of flow pipe system through calculating and analysing.The dissertation sets up the state estimating function of pipenet system,use the east-square method and quick_state_estimating method to estimate the pipenet's state.To the wrong parameter,put forward recognition and correction methods.The dissertation sets up mathematical models of water system's structure parameters' inversion.It sums up the inverse problem into a optimizing problem.According to the characteristics of the optimizing model,it puts forward using the Flexible_Tolereance method and Constrained_Variable_Metric method to solve the problem, analyses the both method's results and defines Constrained_Variable_Metric method as the finally method.The dissertion programs the software of solution to pipenet's construct parameters of water system in oil field . The software is used to water system in Putaohua oil field and the result shows that the study can decrease the calculation error and increase the calculation precision.