徐深气田含二氧化碳深层气井防腐技术

松辽盆地徐深气田所产天然气普遍含有CO₂，气井具有井深、温度高、不同井区CO₂含量变化较大等特点，导致气井CO₂腐蚀情况较为复杂，气井腐蚀非常严重。为此，分析了徐深气田CO₂腐蚀环境特点和因素，评价了各种防腐技术在深层气井中的适用性，开展了4种管材、4种缓蚀剂的优选评价，完成了完井管柱设计以及工艺优化，确实了合理产能的范围，为不同类型含CO₂深层气井防腐方案的制订提供了技术支撑。对类似含CO₂腐蚀气井开发提供了借鉴。

Anti-corrosion technology applied in CO2-contained deep gas wells in Xushen gas field

The natural gas produced in the Xushen gas field, Songliao Basin, commonly contains CO2 in a large variety of content and gas wells are deep under high temperature, so the CO2 corrosion is rather serious on the down hole pipes and strings. Therefore, we analyzed the environment and the factors of CO2 corrosion in this field, made an appraisal of all kinds of anti corrosion technologies on the adaptability in deep gas wells, evaluated and selected the best from four different tubular goods and four different corrosion inhibitors, implemented the design on the down hole pipes and strings and the process optimization for well completion, and determined a reasonable range of well productivity under such conditions. This study provides a robust technical support for engineers to complete proper anti corrosion projects according to different CO2 contained deep gas wells, and a good reference for the development of similar CO2 contained gas wells.