关键词: 数学模型,   ,  仿真模拟,   ,  集输管网,    ,  两相流

Abstract: In view of the characteristics of coalbed methane "multi-point intervening, flexible gathering" and the complex flow pattern of the gas-water two-phase flow in the pipe, under the complicated terrain, the pipeline network pressure fluctuates frequently, seriously affecting the gas gathering and transportation system efficiency and operational safety. In order to more accurately calculate the pressure of the pipe network, based on the multiphase hydraulic and thermodynamic calculation method, the steady-state calculation model of coal-bed gas pipeline network is established by using the pipe network node method. A method of steady-state simulation of segmented pipe network considering terrain fluctuation is put forward. Through the calculation and analysis of the pipe network, it can be seen that the pressure calculation results of the pipe network calculation model under the terrain fluctuation are more accurate and reliable, which provide a reference for rational design and operation of coalbed gas pipeline network in complex terrain.

Key words: Mathematical model,    , Simulation,    , Gathering pipe network,    , Two-phase flow