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| | In the Yakela condensate gas field, corrosion parts of tubing mainly are pin ends, threads, and inside walls from 350m to 3500m. The inside wall corrosion shapes present dense pit like a horsebean and a mung bean. The severe corrosion parts present arranged slots. The outside wall presents worm pit groups. Seventy percent of corrosion product is FeCO3 , which show tubing corrosion is mainly caused by CO2. The main corrosion reasons are high CO2 contents in natural gas, fractional pressure being much higher ... | | 雅克拉凝析气田油管的腐蚀部位主要集中在油管的公扣端、丝扣部位和350-3500mm的油管内壁。油管内壁腐蚀形态呈密布的蚕豆、绿豆大小的蚀坑,腐蚀严重的部位呈纵向排列沟槽状坑蚀;油管外壁呈虫蛀状孔群。腐蚀产物以FeCO3为主,占70%,表明油管以CO2腐蚀为主。腐蚀的主要原因:天然气中CO2含量高,其分压远远超出CO2的临界分压(0.02MPa);生产井的井筒温度高,一般为65-135℃;地层水中Cl-质量浓度高达6.5×104mg/L;工作制度不合理,采气量过大,井内气液流速高并携带有固体颗粒。从曾用的防腐方法的效果看,采用13Cr钢油管防腐效果最好。建议针对性地对各种防腐方法进行综合评估,建立有现场腐蚀监测系统,为采取综合防腐措施提供技术数据。 | | 文摘来源 | |   |
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