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某原油处理厂的伴生气增压后经18 km的24“管道输送到天然气处理厂,接收端气液两相分离器仅能处理正常运行时管道内产生的液体,不能接纳清管时产生的液塞。为了使接收端分离器可以在清管时正常运行,现场采取清管前管道减压,增加气量吹扫的办法减少管道内积液量,由于操作压力和气量选择不合理,清管前后分离器未能正常工作。利用OLGA软件模拟了管道内积液量、分离器进液量随管道压力和入口气体流量变化的动态过程,得到了合理吹扫方案:首先降低管道操作压力,待管道内积液量平稳后提高入口气体流量,管道内积液量小于分离器处理能力时开始清管,该方案保证了清管前后接收端分离器的正常运行。(图3,表1,参10)
A gas processing plant associated gas pressurized after 18 km of 24 ”pipelines to natural gas processing plant, receiving gas-liquid two-phase separator can only handle the normal operation of the liquid generated in the pipeline can not be accepted when pigging Of the liquid plug.In order to make the receiver-side separator can be in the normal operation of pigging, on-site pipeline before taking the pipeline to reduce pressure, increase the amount of gas purge way to reduce the amount of fluid within the pipeline, due to the operating pressure and gas options is not reasonable, clear The separator before and after the tube failed to work properly.Using OLGA software to simulate the fluid volume in the pipe and the flow of the separator with the dynamic process of pipeline pressure and inlet gas flow, a reasonable purge scheme was obtained: first, reduce the pipeline operating pressure, When the amount of fluid accumulated in the pipe is stable, the gas flow at the inlet is increased, and when the amount of fluid in the pipe is less than the capacity of the separator, the pipe is started to be cleaned. This scheme ensures the normal operation of the separator at the receiving end before and after the pigging (Figure 3, Participation 10)