地形起伏输气管道清管过程动态模拟分析

Dynamic Simulation Analysis of Pipeline Pigging Process in Undulating Terrain

摘要: 近期KL管道采用“分段收液 + 隔离收球”方法完成了全线清管作业，排出大量沉积液体，表明冬季供气期间管道低洼处积聚了大量威胁管道及其下游站场安全运行的液体。为优化清管作业技术参数，本文利用OLGA软件建立了KL输气管道清管动态仿真模型，深入分析了不同工况下清管过程中管内流体状态参数(包括流型、压力、持液率、清管速度、液塞长度及清出液量等)的变化规律，并对比了清管前后管内关键参数的时变特征。模拟结果显示，为确保安全，建议清管输量不超过3000 × 10⁴ m³/d，并推荐使用旁通率不低于4%的旁通清管器。研究成果可为KL管道未来的清管作业提供重要参考和指导。

Abstract: Recently, the KL pipeline successfully completed its full-line pigging operation using the “segmented liquid collection + isolated ball retrieval” method, discharging a significant amount of accumulated liquid. This demonstrated that large volumes of liquid had accumulated in low-lying sections of the pipeline during the winter gas supply period, posing a serious threat to the safe operation of both the pipeline and its downstream stations. To optimize the technical parameters for pigging operations, this paper employs the OLGA software to establish a dynamic simulation model specifically for pigging in the KL gas transmission pipeline. It then conducts an in-depth analysis of the variation patterns of fluid state parameters (such as flow patterns, pressure, liquid holdup, pigging speed, liquid slug length, and the volume of liquid discharged) during pigging under various operating conditions. Furthermore, it compares the time-varying characteristics of key parameters within the pipeline before and after the pigging operation. The simulation results indicate that, to ensure safety, the pigging throughput should be limited to 3000 × 10⁴ m³/d or below, and the use of bypass pigs with a bypass rate of at least 4% is recommended. The research findings offer valuable references and guidance for future pigging operations on the KL pipeline.