Study On Improvement And Optimization Of Pressurization System In Middle And Late Stage Of Gas Field Development

In order to ensure the stable production of gas fields,rolling development is necessary.Rolling development is a process in which the pressure of gas Wells decreases continuously and the gas production decreases continuously.In the process of rolling development,the operation capacity of the pressurization system is limited due to too many pressurization valve chambers and uneven station load,which brings great impact to the economic benefits of the gas field.Therefore,it is necessary to put forward the optimized simplified model to improve the surface pressurization system of gas field.This paper first considers the establishment of a simplified model for supercharging system optimization.Objective function is divided into two parts,the first part is the valve group and the new pipeline between gas well,the second part is to keep the valve group for repair,take the sum of the minimum objective function,the model of constraints including basic flow and pressure,to improve the efficiency of solving,choose a streamlined networks.the constraints can be set up at this time of the model as a mixed integer nonlinear programming model.In order to eliminate the nonlinear items of the model,a piecewise linearization method was adopted to convert the mixed integer nonlinear programming model(MINLP)into the mixed integer linear programming model(MILP),and then python code was written to solve the model using the linear programming solver Gurobi.Optimizes simplified topology visualization in Python.After that,aiming at the problem of expensive compressor supercharging,a new supercharging method is explored.A kind of ejector is studied through experiments.The application results of the ejector show that the ejector can increase the total gas production of the block and has better economic benefits.The application also shows that improper pressurization can lead to reduced production from the field.Finally,considering the production economy and load of the gas field surface pressurization system,a comprehensive evaluation system of the gas field surface pressurization system based on the two indexes is established by using the improved analytic hierarchy process(AHP)--fuzzy ahp.By using this evaluation system,the results before and after optimization and simplification of pressurization system are quantitatively analyzed,and the direction of topological structure improvement can be obtained.As experience,it can provide guidance for gas field to balance economy and production adaptability.