射流清管器清管过程中水合物生成及预防研究

The Numerical Simulation on Generation and Inhibition of Natural Gas Hydrate in By-pass Pigging

射流清管器有利于降低自身速度,控制下游气液流型,减小终端分离器体积,但易于形成水合物,因此,需要对天然气管线在射流清管过程中水合物生成情况进行研究。针对某一陆上埋地天然气管线,分别建立管线模型、射流清管模型及节流模型,利用OLGA软件进行水合物的生成模拟,并以MEG作为水合物抑制剂,计算出三种模型中抑制水合物生成所需的最低MEG含量。结果表明,管线压力较高,温度变化较大,在正常运行状态下很容易产生水合物,抑制水合物生成所需的MEG含量达到0.58,而在射流清管过程中,所需的MEG含量增加到0.59;在阀门开度为10%的节流模型中,筛选出四处最易形成水合物的管线位置,计算得出清管器在发生卡堵情况下所需的MEG含量为0.60。

The By-pass pig is propitious to reduce itself velocity, control the flow pattern, and save the size of terminal separator, but it is easy to generate natural gas hydrate in By-pass pigging. The models of pipe, by-pass pigging and throttling were established to study the generation of natural gas hydrate during by-pass pigging in a buried natural gas pipe. The OLGA and PVTsim were used to simulate the generation of hydrate and to calculate the minimum content of MEG, which was the hydrate inhibi- tot. The hydrate generated easily in the peratures. Under the normal conditio 0. 59 in by-pass pigging. There were n, 4 pipe as a consequence of the the content of MEG was to 0. high pressure and various tern- 58, whereas it would be up to sites where the hydrate generated easily in the throttling model which had 10% valve opening, and the content of MEG was 0.60 when the pig was blocked.