中俄东线天然气管道投产初期水合物预测及防治模拟

Hydrate prediction, prevention and control simulation at the initial stage of commissioning of China-Russia Eastern Gas Pipeline

中俄东线天然气管道管径大、压力高、北段处于寒区,投产运行初期高压、低温条件使管道存在水合物生成风险。基于多相流理论和CSMHyK水合物生成动力学模型,针对该管道投产第一年冬季运行工况下水合物的生成区域、生成量,水合物在管道中的堆积程度以及水合物的防治方法开展研究。结果表明:当管输天然气含水量大于150 mg/kg时,管道存在水合物生成风险;管道中生成的水合物主要聚集在低洼管段下游,管段高差越大,水合物聚集量越多,且管道中水合物的堆积程度不仅与低洼管段上升段的高差有关,还与下坡段管道的高差及坡度有关;当选择乙二醇作为水合物抑制剂且其注入质量分数达到50%时,可以有效防止中俄东线天然气管道生成水合物。(图6,表4,参22)

In view of the large pipeline diameter and high pressure of China-Russia Eastern Gas Pipeline,as well as the location of the northern section in cold region,the high pressure and low temperature conditions at the initial stage of pipeline commissioning and operation may raise the risk of hydrate formation.Based on the multiphase flow theory and CSMHyK hydrate formation dynamics model,research was carried out on hydrate formatting area,amount of hydrate formation,degree of hydrate accumulation in the pipeline and hydrate control methods under winter operation conditions in the first year of commissioning of the pipeline.The results show that when the water content of the pipeline gas is more than 150 mg/kg,the pipeline is at a risk of hydrate formation.Hydrate formatted in the pipeline mainly accumulates in downstream of the low-lying pipeline section.The higher the elevation difference of the pipeline section,the more hydrate accumulates.The degree of hydrate accumulation in the pipeline is related to both the elevation difference of the upslope pipelines and the elevation difference and slope of the downslope pipelines in the low-lying pipeline section.When ethylene glycol is used as hydrate inhibitor with the injection mass fraction up to 50%,hydrate formation in China-Russia Eastern Gas Pipeline can be effectively prevented.(6 Figures,4 Tables,22 References)