丘陵起伏集输管道临界携液流速数值模拟与模型研究

Numerical Simulation and Model Study on Critical Liquid-Carrying Velocity of Gathering and Transportation Pipelines in Hilly and Uneven Terrain

摘要: 针对重庆气矿丘陵地形起伏湿气集输管道倾角复杂、积液频发、运行稳定性差的工程难题，本文以天高线B段复线为例，依托Hysys、OLGA多相流仿真软件建立精细化集输管道气液两相流动模型，经现场实测数据校核，模型整体误差仅1.28%，精度满足工程研究要求。采用单因素变量法系统探究出口压力、入口温度、环境温度等关键参数对管道临界携液流速的影响规律，明确了丘陵起伏管线的携液响应机制。同时，对比肖高棉液膜反转模型与Belfroid液滴模型对多类型起伏管线的适配能力，通过重庆气矿6条集输管线的误差量化分析完成模型优选。结果表明：管道出口压力升高可显著降低临界携液流速，入口、环境温度升高会小幅提升临界携液流速；相较于肖高棉模型，Belfroid模型平均绝对误差仅3.86%，标准偏差5.68%，预测精度与工况普适性远优于肖高棉模型，可精准适配重庆气矿多倾角复合起伏集输集输管道。研究成果可为气矿起伏管线积液预判、运行参数优化及积液防控提供理论依据与技术支撑。

Abstract: Addressing the engineering challenges of complex inclination angles, frequent liquid accumulation, and poor operational stability in the hilly and uneven terrain of the Chongqing Gas Field’s wet gas gathering and transportation pipelines, this paper takes the B section of the Tiangao Line as an example. A refined gas-liquid two-phase flow model of the gathering and transportation pipeline is established using Hysys and OLGA multiphase flow simulation software. Verified with field measurement data, the overall error of the model is only 1.28%, meeting the accuracy requirements for engineering research. The single-factor variable method is used to systematically explore the influence of key parameters, such as outlet pressure, inlet temperature, and ambient temperature on the critical liquid-carrying velocity of the pipeline, clarifying the liquid-carrying response mechanism of the pipelines in hilly and uneven terrain. Meanwhile, the adaptability of the Shokawyn liquid film inversion model and the Belfroid droplet model to various types of pipelines in hilly and uneven terrain was compared, and model optimization was completed through error quantification analysis of six gathering and transportation pipelines in the Chongqing gas field. The results show that increasing the pipeline outlet pressure significantly reduces the critical liquid-carrying velocity, while increasing the inlet and ambient temperatures slightly increases the critical liquid-carrying velocity. Compared to the Shokawyn model, the Belfroid model has an average absolute error of only 3.86% and a standard deviation of 5.68%, demonstrating significantly better prediction accuracy and operational universality. It can accurately adapt to the multi-angle composite gathering and transportation pipelines in hilly and uneven terrain the Chongqing gas field. The research results can provide theoretical basis and technical support for predicting liquid accumulation, optimizing operating parameters, and controlling liquid accumulation in undulating pipelines in the gas field.