In the construction of the oil field ground,the investment in the gathering and transportation network accounts for a considerable proportion.Therefore,the optimization of the construction parameters of the gathering and transportation network can achieve significant economic benefits.In reality,most of the physical quantities in the gathering and transportation network are characterized by uncertainty.The uncertainty of these physical quantities will affect the results of the design calculation and operation condition analysis of the gathering and transportation network,leading to the traditional method of optimizing the parameters of the collection and transportation network,which cannot accurately reflect the influence of uncertain parameters on the design results.To solve this problem,based on the idea of reliability,this paper comprehensively considers the uncertainties of oil physical properties,environmental parameters,and operating parameters,and conducts optimization of the parameters of the collection and transportation pipeline network under two-dimensional and three-dimensional terrain conditions.Research and achieved the following results:First of all,on the basis of a large number of investigations,systematically discusses the main uncertainties and characteristics of oil and gas storage and transportation engineering.Based on the theory of probability and fuzzy mathematics,a mathematical characterization method for uncertain parameters was established,which laid a theoretical foundation for optimization design of oil and gas gathering and transportation network based on uncertainty analysis.Second,on the basis of an in-depth analysis of the structural characteristics of tree-like pipeline networks,according to the law of conservation of mass and energy,combined with the hydraulic thermal calculation method of gas-liquid mixed transportation pipelines,a set of parameters calculation method for the process flow node of a tree-shaped single-pipe collection and transportation network was deduced.Again,taking the tree-shaped single pipe wellhead heating process as an example,a hydraulic thermal analysis method for horizontal gas-liquid gathering pipelines considering the uncertainty of parameters was established.The hydraulic thermodynamic analysis method was solved by using the Monte-Carlo simulation method.On this basis,with the fuzzy reliability as a constraint and the minimum cost of pipeline construction as the objective function,a mathematical model for optimizing the parameters of the gathering and transportation network was established.Applying engineering example verifies the effectiveness of the pipeline process parameter calculation method and parameter optimization model.This model considers the operating safety of the gathering pipelines on the basis of optimizing the investment in pipeline network construction,and has certain theoretical and practical value.Finally,taking the tree-shaped single-tube unheated gas-liquid mixed transportation as an example,the calculation method of pipeline process and optimization of pipeline Network parameters under topographic condition were studied.Considering the effect of undulating terrain and multi-phase flow characteristics on the hydraulic thermal calculation of a gathering pipeline,the blind number theory was introduced to establish a hydraulic thermal analysis method for a fluctuating topographical gathering pipeline considering flow instability.On this basis,taking the blindness reliability as the constraint condition and taking the minimum cost as the objective function,the mathematical model of the optimization of the gathering and transportation pipeline and pipeline network parameters under the undulating terrain condition were established.The application engineering example verifies the validity of the model. |