天然气集输管道内腐蚀影响因素及防护措施研究  

Study on the influencing factors and protective measures of internal corrosion in natural gas gathering and transportation pipelines

作　　者：赵良 ZHAO Liang(Beijing Xingyou Engineering Project Management Co.,Ltd.,Beijing 100083,China)

机构地区：[1]北京兴油工程项目管理有限公司,北京100083

出　　处：《能源化工》2024年第2期60-64,共5页Energy Chemical Industry

基　　金：中石油科技创新基金项目(编号:2020D-5007-0394)。

摘　　要：随着天然气集输管道运行时间的延长,管道内腐蚀问题日益突出,因此,为了保障天然气集输管道的高效安全运行,室内采用挂片失重法对目标天然气集输管道内腐蚀影响因素进行了评价,并在此基础上开展了腐蚀防护措施研究。结果表明,试验温度越高、二氧化碳和硫化氢的分压越高、矿化度越高,挂片的腐蚀速率就越大,而试验时间越长,腐蚀速率则先增大后减小。在相同的试验条件下,加入不同类型的缓蚀剂均能起到较好的腐蚀防护效果,其中缓蚀剂TR-2的效果相对更好。当缓蚀剂TR-2的加量达到120 mg/L时,缓蚀率可以达到95.7%,并可使挂片的腐蚀速率降低至0.076 mm/a以下,腐蚀防护效果较好。天然气中二氧化碳和硫化氢的含量对集输管道内腐蚀速率的影响较大,添加缓蚀剂能够有效减缓集输管道的腐蚀速率。With the extension of the operation time of natural gas gathering and transportation pipelines,the problem of corrosion inside the pipelines is becoming increasingly prominent.Therefore,in order to ensure the efficient and safe operation of natural gas gathering and transportation pipelines,the hanging piece weight loss method is used indoors to evaluate the factors affecting corrosion inside the target natural gas gathering and transportation pipelines,and the corrosion protection measures are studied.The results show that the higher the experimental temperature,the higher the partial pressure of carbon dioxide and hydrogen sulfide,and the higher the mineralization degree,the greater the corrosion rate of the hanging piece.However,the longer the experimental time,the corrosion rate first increases and then decreases.Under the same experimental conditions,adding different types of corrosion inhibitors can achieve good corrosion protection effects,among which the effect of corrosion inhibitor TR-2 is relatively better.When the dosage of corrosion inhibitor TR-2 reaches 120 mg/L,the corrosion inhibition rate can reach 95.7%,and the corrosion rate of the hanging piece can be reduced to below 0.076 mm/a,indicating good corrosion protection effect.The content of carbon dioxide and hydrogen sulfide in natural gas has a significant impact on the corrosion rate inside gathering and transportation pipelines,and adding corrosion inhibitors can effectively slow down the corrosion rate of gathering and transportation pipelines.

关 键 词：天然气集输管道 内腐蚀 腐蚀速率 影响因素 防护措施 

分 类 号：TE988.2[石油与天然气工程—石油机械设备]