改变输量对输气管线积液量的影响

Effect of Flow Rate Change on Liquid Loading of Gas Transmission Pipeline

对输气管道清管周期影响因素的分析认为,管道的输气效率是影响清管周期的最主要因素.运用JAVA语言编制了管道输气效率的计算程序,分析了管线积液对输气效率和清管周期的影响;同时对不同工况下的普光气田D404~D405管线和长治气田A集气站处理中心管线进行了OLGA模拟,并对输气效率进行了计算.分析结果认为:在流量较低的情况下,管线积液量会持续增长,输气效率持续下降,直到低于允许的最小输气效率时,应对管线采取清管作业;在流量较高的情况下,管线的积液量会在短时间内达到平衡,此时的输气效率趋于稳定,随着时间的推移因存在腐蚀或者固体杂质的影响输气效率缓慢下降;针对流量较低的情况,采用提升入口气量进行的管线积液吹扫是一种更为便捷的清管手段,并给出了临界吹扫流量的计算公式.

The analysis of several factors affecting the pigging cycle of gas transmission pipeline consid- ers that the gas transmission efficiency of pipeline is the most important factor affecting the pigging cycle. Computing program of pipeline gas transmission efficiency is compiled by JAVA language,and the in- fluence of pipeline liquid loading on gas transmission efficiency and pigging cycle is analyzed. At the same time,OLGA simulation of D404 to D405 pipeline in Puguang Gas Field and the pipeline in the treatment center of a gas gathering station in Changzhi Gas Field under different working conditions is carried out,and gas transmission efficiency is calculated. Analysis results show that under the condition of low flow rate,pipeline liquid loading will continue to increase and gas transmission efficiency will continue to decline until gas transmission efficiency is lower than the allowable minimum value,and then pipeline pigging operation should be adopted. In the case of a high flow rate,the liquid loading of pipeline will reach equilibrium in a short time,and gas transmission efficiency will tend to be stable at this time. There will be corrosion or solid impurities as time goes by,which will slow down gas trans- mission efficiency. In view of the condition with a low flow rate,it is more convenient to purge pipe- line liquid loading by raising the inlet gas flow rate,and the calculation formula of the critical flow rate is given.