川东北高含硫天然气对管道的腐蚀
Piping Corrosion Induced by High-Sulphur Natural Gas in Northeast of Sichuan Basin
摘 要
现场调查和实验室试验表明,川东北高含硫地区输气管道的腐蚀具有如下特征:① 影响腐蚀的主要因素是CO2、H2S、Cl-,腐蚀形式以点蚀、氢脆和硫化物应力腐蚀(SSC)为主,② H2和NaCl的水溶解度很高,是影响腐蚀的重要因素;③ A3钢在实验室模拟中21井试验后得知,井下部油管最大的腐蚀速率可达1.24 mm/a,井筒下部较上部严重.
高含硫
天然气
管道
腐蚀
northeast of Sichuan
high-sulphur
natural gas
oil tube
corrosion
Abstract
Through field investigation and model experiment,the oil tube corrosion in northeast of Sichuan basin is characterized as follows.(1) The main factors affecting the oil tube corrosion are CO2,H2S and Cl-.The main corrosion types are pitting corrosion,hydrogen embrittlement and sulfide stress corrosion (SSC).(2) The reason of H2S and NaCl as main factors affecting corrosion could be explained by their good dissolubility.(3) From laboratory model test of A3 steel in well Zhong 21 the corrosion rate of oil tube at the low part reached 1.24 mm/a.
中图分类号 TG174.4
所属栏目 试验研究
基金项目 中国地质大学(北京)大学生创新性实验计划重点项目
收稿日期 2007/9/10
修改稿日期 2007/10/9
网络出版日期
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引用该论文: CAI Yi-dong,ZHOU Ling,LI Jun-xi,LIU Da-meng. Piping Corrosion Induced by High-Sulphur Natural Gas in Northeast of Sichuan Basin[J]. Corrosion & Protection, 2008, 29(9): 526～529
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参考文献
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【6】李鹭光,黄黎明,谷 坛,等.四川气田腐蚀特点及防腐措施[J].石油天然气化工,2007,36(36):46-54.
【7】刘绘新,苏永平.川东气田油管腐蚀现象的基本特征[J].天然气工业,2000,20(5):77-79.
【8】Iyer R N,Takeuchi I,Zamanzadeh M,et al.Hydrogen sulfide effect on hydrogen entry into iron:a mechanistic study[J].Corrosion,1990(6):460-468.
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