油气混输管道中天然气水合物的形成和堵塞过程研究

发布时间：2018-01-18 11:08

本文关键词：油气混输管道中天然气水合物的形成和堵塞过程研究　出处：《石油与天然气化工》2017年02期 　论文类型：期刊论文

【摘要】：为研究油气混输管道中天然气水合物的形成和堵塞过程,采用自行设计的高压环道装置,以去离子水、柴油、天然气为管输介质,在含水率70%、液相初始流量2 000kg/h等条件下进行水合物堵塞实验。研究结果表明:实验时水合物在管道中各处同时生成,但初始生成量并不相同;在实验含水率70%的条件下,水合物主要在管道气相空间壁面和液相主体中生成;水合物的生成会导致管内流量降低,在未添加乳化剂的情况下,油水混合液会因流量的降低而产生分层,此时水合物颗粒集中分布在混合液下层,造成流体黏度和管段压降的急剧升高,进而引发管道堵塞。
[Abstract]:In order to study the formation and blockage process of natural gas hydrate in oil-gas mixed transportation pipeline, a self-designed high-pressure loop device was adopted, in which deionized water, diesel oil and natural gas were used as pipeline transport medium with water content of 70%. At the initial liquid flow rate of 2 000 kg / h, the hydrate plugging experiment was carried out. The results showed that the hydrates were formed all over the pipeline at the same time, but the initial amount of hydrate formation was not the same. Under the experimental water content of 70%, the hydrates are mainly formed in the gas space wall and the liquid body of the pipeline. The formation of hydrate will lead to the decrease of the flow rate in the tube. Without emulsifier, the mixture of oil and water will be stratified because of the decrease of the flow rate, and the hydrate particles will be concentrated in the lower layer of the mixture. The fluid viscosity and the pressure drop of the pipe section are increased sharply, which leads to the blockage of the pipe.
【作者单位】：山东省油气储运安全省级重点实验室中国石油大学(华东);中国石化集团新星石油有限责任公司;
【基金】：国家自然科学基金“水合物颗粒聚集动力学及流动安全研究”(51006120) 高等学校博士学科点专项科研基金“天然气水合物生长动力学及快速形成机理研究”(20110133110004)
【分类号】：TE832.2
【正文快照】： 天然气水合物是水分子与甲烷、乙烷等气体分子在低温高压条件下,通过范德华力结合形成的笼状晶体化合物[1]。在油气开采和输送过程中,由于高压和低温条件,很容易形成天然气水合物堵塞管道,有碍正常生产[2-3]。自1934年前苏联在天然气输送管道中首次发现水合物堵塞以来[4],随着

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