东胜气田井筒O_(2)腐蚀评价与防护对策研究  

Evaluation and protection of O_(2)corrosion in wellbore of Dongsheng gas field

作　　者：齐宏伟[1] QI Hongwei(SINOPEC North China E&P Company,Zhengzhou 450000,China)

机构地区：[1]中国石化华北油气分公司,河南郑州450000

出　　处：《石油化工腐蚀与防护》2024年第2期1-8,共8页Corrosion & Protection In Petrochemical Industry

基　　金：中国石化华北油气分公司科研项目“东胜气田钻采工艺关键技术研究”(KJGLB-2022-13)。

摘　　要：膜分离制氮气举技术是东胜气田积液井、水淹井排出积液进而恢复产能的重要手段之一。但目前移动式膜分离制氮技术制取的氮气中O_(2)体积分数为5%左右,随着注入次数、注入量的增加,井筒管柱的O_(2)腐蚀问题愈发严重。该研究通过高温高压动态腐蚀试验明确了东胜气田腐蚀影响规律。试验表明:含O_(2)环境下,N80材质腐蚀速率稍大于P110材料;浸没程度对O_(2)腐蚀速率的影响为全浸没>半浸没>未浸没。据此优选抗O_(2)腐蚀缓蚀剂,室内评价试验表明:钼酸钠+葡萄糖酸钠型缓蚀剂缓蚀率达90%以上。现场3口试验井均取得了较好的缓蚀效果,最大缓蚀率达73.33%。Membrane separation technology for nitrogen production is one of the important means for the recovery of production capacity through the discharge of accumulated liquid and water flooded wells in Dongsheng gas field.But currently,the mobile membrane separation technology produces nitrogen with an O_(2)content of about 5%.With the increase of injection frequency and injection amount,the problem of O_(2)corrosion in the tubing string becomes more and more serious.The corrosion mechanism of Dongsheng gas field was clarified through high-temperature and high-pressure dynamic corrosion tests.The results showed that the corrosion rate of N80 material was slightly higher than that of P110 material in the environment containing O_(2),and the influence of immersion degree on the O_(2)corrosion rate was:full immersion>semi immersion>non-immersion,based on which the optimal O_(2)corrosion inhibitor was selected.Indoor evaluation tests displayed that the inhibition rate of sodium molybdate&sodi-um gluconate was over 90%;meanwhile,3 on-site test wells achieved good inhibition effects,with a maximum inhibition rate of 73.33%.

关 键 词：注氮气 排水采气 O_(2)腐蚀 油管柱 缓蚀剂 

分 类 号：TE983[石油与天然气工程—石油机械设备]