【作者】 李娟娟；

【导师】 焦文玲；

【作者基本信息】 哈尔滨工业大学 ， 供热、供燃气、通风及空调工程， 2006， 硕士

【摘要】 地下储气库在天然气的开发和利用过程中起着举足轻重的作用,它是用来调节城市用气季节不均匀性的最有效途径之一。在地下储气库中,30%~70%的气体被用作垫层气以保证储库的输气能力。对于新建储库而言,垫层气是一项很大的投资,对于含水层型地下储气库尤为显著。以廉价的惰性气体代替天然气作为部分垫层气,具有非常重要的经济意义,在国外已成功地进行了实践。本文概述了国内外天然气地下储气库的研究发展现状,以及国外以惰性气体作为垫层气的成功经验。根据储气库的运行机理,建立了描述含水层型天然气地下储气库气水两相渗流的数学模型;考虑惰性气体与天然气的混合,建立了气体扩散模型,并以此为基础,建立了二维平面有限元模型,采用半离散方法对数学模型进行了有限元方程的推导。应用所建立的数学模型成功地进行了含水层型地下储气库以惰性气体作为部分垫层气的建库过程和工业运行的模拟,并分析影响气体混合及回采气质量的因素。本文采用Matlab语言编程对模型进行求解,建立了一套完善的求解程序,结果可以直接以图形显示,从图上可以看到任意时刻的储库压力、饱和度、惰性气及天然气的浓度分布情况,可随时监控气水运移以及两种气体的相互混合情况。本文的模拟研究结果,对地下储气库以惰性气体作垫层气时的储库建设及运行等具有一定的理论指导意义和实用价值。更多还原

【Abstract】 The Underground Gas Storage Reservoir (UGSR) plays an important part in gas exploiting and utilization, as one of the most effective method to adjust the disequilibrium between supply and demand of city gas.In an UGSR, a large part (30%~70%) of total gas stored is used as cushion to provide a desired deliverability. Base gas costs are a major cost item for new storage fields. This is particularly true for aquifer storage fields. Therefore, the use of less expensive inert gas to substitute all or part of the base gas requirements in UGSR is of significant economic interest, and it is a promising technology that has been successfully field tested in foreign.In this dissertation, research and development of gas storage in domestic and foreign are summarized. According to the operation mechanism of UGSR, a model on gas-water flow through porous medium for the Underground Gas Storage Reservoirs in aquifer is developed; when replace part of the cushion by inert gas, considering the mixing between the inert and natural gas, gas diffusion model is established. Based on above two models, the numerical model of the Two-Dimension Finite Element Method is build up successfully, and the finite element equation with semi-discrete method is deduced.By using the mathematical model developed in this paper, the construction and commercial operation in the aquifer storage when substitute part of the cushion by inert gas is simulated successfully and the factors that influence the mixing between natural gas and inert gas are analyzed.In this article,Matlab program language is used to solve the model. A set of finite element analysis programs are provided. By showing the results of calculation directly with figures, the transportation of gas and water, and the mixing between the different gases can be monitored and controlled at any time.The simulation results derived has much theoretical and utilizable value in aquifer storage when substitute part of cushion with inert gas.更多还原