Process Calculation And Optimal Design Of Oilfield Gathering And Transportation Pipeline Network

In order to ensure the continuous supply of oil,oil and gas field development of key areas gradually from the inner road to the ocean,desert and other natural conditions are relatively poor areas.Domestic oil and gas field exploration and development in the form of desert,ocean,remote oil and gas fields to improve the reserves and production capacity of the end area.In the development of remote oil and gas fields,the production conditions of the oil and gas fields are much higher than those of the conventional oil and gas fields in the remote areas,due to the natural environment and the production conditions are very poor.Therefore,in order to reduce the development of investment costs and effective development of offshore oil and gas fields,desert oil and gas fields and remote oil and gas fields to improve the economic benefits of oil and gas field development,countries around the world are trying to study multiphase flow mixing pipe network transmission technology.According to the coupling relationship between hydraulic and thermodynamic parameters calculation of multiphase flow in pipeline,establishes the mathematical model of oil gas water multiphase flow coupling calculation of hydraulic and thermal calculation,on the basis of preparation of thermodynamic hydraulic for multiphase flow pipeline calculation program and used to calculate the pipe end point temperature and pressure.The actual operating conditions combined with the multiphase flow pipeline,the mixture viscosity parameters were revised,proposed a revised model of Taylor viscosity formula,using BFGS to solve the optimization constraints in the model,the correction coefficient was used to calculate the model.The modified model can effectively improve the calculation of pressure dropcalculation precision,meet the design requirements of pipeline calculation accuracy.According to the dendritic structure characteristics of the multiphase flow mixed pipe network,the calculation method is put forward based on the theory of the inner tree and the actual conveying condition.The hydrodynamic coupling calculation mathematical model of the oil and gas multi-phase flow mixing pipe network is established model.And the introduction of cell structure to optimize the storage structure,improve the space utilization,can be carried out for the complex design of the pipe network to facilitate the calculation of the pipe network model provides a new way of thinking.And the calculation and calculation of the hydraulic and thermal calculation algorithm of the mixed pipe network are carried out.After the correction of the viscosity coefficient and the total heat transfer coefficient of the oil-water mixture,the calculation results show that the correction improves the accuracy of the hydraulic calculation of the mixed pipe network.The establishment of oil gas water multiphase flow system.According to the mathematical model of optimization design of gathering network system parameters of the multi-objective optimization problem of oil gas water multiphase flow,the differential evolution algorithm is used to solve the optimization.The results show that the optimized mixed transportation system greatly reduces the energy cost,power cost increased slightly.The objective function substitution model after the optimization of diameter parameter is14.73% lower than that before optimization,and achieved good results.