气井井筒天然气流动规律及应用研究

Abstract
This paper presents the basic concept of the production systematic analysis gas well and the basic principle and method in nodal point analysis of the gas well; Give the result of deep going analysis as well as research on the gas flow rule in the wellbore,performance relationships curve of inflow and outflow as well as the curve of pure gas well sand liquid production on gas wells. According to the actual production conditions,the mathematical model of nodal system analysis of the gas wells is established and the mathematic expressions are proposed. It can be used to calculate the gas yielding amount of different tubing diameters and the pressure loss for each segment and to predict the gas productivity based on the performance curves of gas wells. It can also be applied to do many other works for gas wells such as system’s index prediction and parameter optimization,etc. The calculation and analysis are conducted by means of the field data from several gas wells in Sichuan oilfield. The calculated results accord basically with the real indices and parameters. On the basis of the conclusion on the various mathematic models which show the accurate calculation and approximate calculation of downhole pressure in conventional gaszones and the calculation program, mathematic models with the calculation method for nodal point analysis in gas production system, the author presents the new calculation method of differential pressure alternative calculation for the vertical pipe flow in condensate gas reservoir and the new method for accurate and approximate calculating of the downhole pressure in gas wells on the varies type of gas pool by gas column pressure in wellbore as well as well test method of non-closing well for determination main parameter of inflow performance curve. The paper analyzes the simulating and optimizing for the production system along with the factors of pay rate which are influenced by the tubing diameter in an individual well, gas gathering procedure and pressure in the separator and determines the analysis method for hydraulic performance under current circumstance. The paper has an instructive and application significance in optimizing productivity control determining the production status while stopping blowout and the best time for the gas well to artificial lift, therefore, enhancing the production rate and recovery efficiency.
Key  words: gas production engineering; production system nodal point analysis; downhole pressure; mathematic model; calculating program

1.1 研究的目的与意义 1
1.2 国内外研究现状 2
1.3 本文主要工作 3

2.1 气体稳定流动能量方程 4
2.2 管内摩阻 6

3.1 气体垂管流动 9
3.2 应用气体稳定流动能量方程计算井底压力常规方法 10

4.1 气井流入动态曲线 21
4.2 流出动态曲线和油管动态曲线 22
4.3 纯气井和出水气井动态曲线 23

5.1 气井生产系统分析基本概念 25
5.2 气井生产系统分析的基本原理和程序 26
5.3 气井节点分析的运用 27

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