川东地区含硫气田集输管道内腐蚀研究

发布时间：2018-03-21 05:27

本文选题：输气管道　切入点：内腐蚀　出处：《西南石油大学》2015年硕士论文　论文类型：学位论文

【摘要】：随着近年来油气田开采的不断扩大和天然气工业不断发展,集输管道建设的不断增加,与此相关的腐蚀问题也越来越严重。管道的腐蚀不仅会造成管线破损、泄露,引发安全事故,还会引起环境污染,危害人民健康和财产安全,带来巨大的经济损失的同时,也引发了恶劣的社会影响。本文通过分析含硫天然气管道内腐蚀的主要类型,了解造成内腐蚀的主要原因。通过对川东地区管道进行气质分析,腐蚀管段取样和清管物取样,并对样品进行腐蚀程度和原因的分析,证明该管道内腐蚀原因为H2S-CO2腐蚀。通过对实际管段进行取样,进行室内实验研究川东地区管段内腐蚀的规律。通过实验发现：(1)管线用20钢和X52管线钢的腐蚀形态主要为均匀腐蚀,与川东地区干线内检测结果相对应。(2)通过模拟证明含水的三甘醇溶液仍具有腐蚀性,不同水介质组成对应的腐蚀速率有明显差别。(3)在模拟工况条件下,获得了5～50天周期内的H2S-CO2腐蚀速率和水浸润时间对腐蚀的影响。通过开展取样分析和实验研究,分析造成川东地区内腐蚀的根本原因是H2S-CO2腐蚀；直接原因是输送含H2S、CO2的介质,集气干线输送气源中有未经脱水的天然气,集气干线沿线携带甘醇损失严重,脱水装置及其上游过滤效果不佳,影响脱水效果。通过对川东地区的内腐蚀原因和规律的研究,提出加强脱水装置运行,确定合适的清管周期和加注缓蚀剂的控制内腐蚀的措施。通过对川东地区的内腐蚀研究和控制措施的提出,对于减缓原料气干气管道的内腐蚀,延长管道的使用寿命,保障管网安全经济运行,具有十分重要的意义。
[Abstract]:With the continuous expansion of oil and gas production and the development of natural gas industry in recent years, the construction of gathering pipeline is increasing, and the related corrosion problems are becoming more and more serious. The corrosion of pipeline will not only cause pipeline damage and leakage, Causing safety accidents will also cause environmental pollution, endanger people's health and property safety, bring huge economic losses, but also lead to bad social impact. This paper analyzes the main types of corrosion in sulfur containing natural gas pipeline. Understand the main causes of internal corrosion. Through temperament analysis of pipelines in East Sichuan, sampling of corrosion pipe section and pipe cleaning, and analysis of corrosion degree and cause of samples, It is proved that the internal corrosion of the pipeline is caused by H _ 2S-CO _ 2 corrosion. The corrosion pattern of 20 steel and X52 pipeline steel used for pipeline is mainly uniform corrosion, the results show that the corrosion pattern of 20 steel and X52 pipeline steel is uniform. It is proved by simulation that the aqueous triethylene glycol solution is still corrosive, and the corrosion rate corresponding to different water composition is obviously different. The effect of H _ 2S-CO _ 2 corrosion rate and water soaking time on corrosion in 50 days period was obtained. Through sampling analysis and experimental study, it was found that the root cause of corrosion in East Sichuan was H _ 2S-CO _ 2 corrosion, and the direct reason was to transport medium containing H _ 2S _ 2 CO _ 2. There is undehydrated natural gas in the gas collection trunk line, the loss of glycerol carried along the main gas gathering line is serious, the filtration effect of dehydration device and its upstream is not good, and the dehydration effect is affected. Through the study of the internal corrosion cause and law in East Sichuan, The measures of strengthening the operation of dehydration unit, determining the proper pipe-cleaning period and controlling internal corrosion by adding corrosion inhibitor are put forward. Through the study of internal corrosion in East Sichuan and the suggestion of control measures, the internal corrosion of dry gas pipeline of feedstock gas can be alleviated. It is of great significance to prolong the service life of pipeline and ensure the safe and economical operation of pipe network.
【学位授予单位】：西南石油大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE988.2

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