With the continuous development of gas field development technology, the application of long-distance gas-liquid mixed transportation pipeline in production and construction projects is increasingly common. After some gas field gathering and transportation pipelines enter the late stage of production, they are affected by the decrease of gas production and the increase of gas field water, and they are confronted with the problem of excessive effusion. Reasonable consideration of pigging and slug control treatment will greatly save the investment of slug catcher. Segmented pigging technology can reduce the size of slug catcher, and it has economic advantages in large-diameter and high-pressure gathering and transportation pipeline project. Therefore, it is necessary to explore the liquid accumulation and drainage rules of pigging in gathering and transporting pipelines in order to accurately determine the load of slug catcher. Based on the collection and transportation pipeline effusion and pigging drainage rule, this paper analyzes the segmented pigging effusion and drainage rule, deduces the correlation formula of initial effusion, pigging time and drainage volume, and further discusses the main factors influencing the segmented pigging effusion and drainage rule by combining with the dynamic simulation results of commercial software. The research results show that the segmented pigging of gathering and transporting pipelines in large-diameter and high-effusion gas fields has significant influence on the catcher load, and the reversed segmented pigging can greatly reduce the catcher load, and the derived segmented ratio and the calculation formula of catcher load are relatively accurate. The research results in this paper can provide some references for pigging scheme of gas field gathering and transportation pipelines and the idea of setting slug catcher.%随着气田开发技术不断发展,长距离气液混输管道在生产建设项目中应用日趋普遍.部分气田集输管道进入生产后期后,受产气量降低和气田水增加影响,面临积液过大的问题,合理考虑清管与段塞流控制处理方案,将大幅节省段塞流捕集器投资.分段清管技术可减小段塞流捕集器尺寸,在大口径、高压力集输管道工程中具有经济优势.因此,有必要探讨集输管道分段清管积液与排液规律,以准确确定段塞流捕集器负荷.基于集输管道积液及清管排液规律,分析分段清管积液与排液规律,推导初始积液、清管时间与排液体积的相互关系式,结合商业软件动态模拟结果,进一步探讨影响分段清管积液与排液规律的主要因素.研究结果表明,大口径、高积液气田集输管道分段清管对捕集器负荷影响显著,分段反序清管可大幅降低捕集器负荷,推导的分段比例和捕集器负荷计算公式较为准确.研究成果可为气田集输管道清管方案和段塞流捕集器设置思路提供参考.
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