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气水两相数值模拟,由于气相和水相在压缩性、粘度、重度和流动性质等方面存在较大差异,以及气田开发矿场应用的特性而独具特点。四川气田大多数有地层水,为提高有水气藏的开发效果,我们进行了有水气藏模拟研究尝试。本文全面推导了数学模型Ⅰ,并建立了适应四川气藏实际的模型Ⅱ和模型Ⅲ,较全面的描述了可压缩的气水两相流体(不互溶)在非均质弹性孔隙介质内的渗流过程,提出了定气井产量、定井口、井底压力生产的条件,反映了气田开发的全过程;介绍了气藏面积模拟过程和“稳压、显饱”方法,并在模型Ⅰ的计算中采用了“线性外推”方法近似求dB_i(p)/dp和dφ(p)/dp的值,在模型Ⅱ、Ⅲ的计算中引用了P.M.Dranchuk和.H.Abou—Kassem计算天然气偏差系数Z(P)和压缩系数Cg(P)的成功方法;利用DJS—6机ALGOL—60语言和DJS—18机BD—200语言编制了功能较强的模拟软件。通过相国寺气田石炭系气藏面积模拟算例表明,文中提出的“模型”和“方法”具有精度高、速度快、稳定性可靠的优点。初步认为可以投入实际应用。
Gas-water two-phase numerical simulation, due to the gas phase and water phase in the compressibility, viscosity, heavy and flow properties of large differences exist, as well as the characteristics of gas field development and application of the unique characteristics of the mine. Most of the gas fields in Sichuan have formation water. In order to improve the development effect of the water-bearing gas reservoirs, we have tried to simulate the water-gas reservoir. In this paper, the mathematical model Ⅰ is deduced in a comprehensive way and the model Ⅱ and Ⅲ that are suitable for Sichuan gas reservoir are established. The seepage flow of compressible gas-water two-phase fluid (immiscible) in heterogeneous elastic porous media The conditions of gas well production, fixed wellhead and bottomhole pressure production are put forward, which reflect the whole process of gas field development. The gas reservoir area simulation process and the method of “steady pressure and significant gas saturation” are introduced. In the calculation of model I The linear extrapolation method is used to approximate the values of dB_i (p) / dp and dφ (p) / dp. PMDranchuk and H.H.Abou-Kassem are used in the calculations of models II and III to calculate the natural gas deviation coefficient Z (P) and compression coefficient Cg (P). A powerful simulation software was developed by using ALGOL-60 language of DJS-6 and BD-200 language of DJS-18. Through the simulation study of the Carboniferous gas reservoir area in the Xiangguosi gas field, the “model” and “method” proposed in this paper have the advantages of high precision, high speed and reliable stability. Initially thought that can be put into practical application.