淮阴工学院学报

以淮安地区盐穴储气井为研究对象，基于NaCl卤水溶液腐蚀浸泡试验，分析了N80、L80、TP110TS 3种套管钢的腐蚀特性，并结合有限元方法探讨了腐蚀行为对套管等效应力和剩余强度的影响。结果表明：3种材料腐蚀速率随着腐蚀时间的延长持续减小，N80钢腐蚀速率最高，L80钢腐蚀速率最低，耐腐蚀性能最好。随着溶液中含盐量的增加，3种材料腐蚀速率先增加后减少。在70℃环境条件下材料的腐蚀速率显著高于50℃时的情况，套管腐蚀寿命也大幅缩短。套管抗内压强度随腐蚀深度的增加持续下降，TP110TS钢抗内压安全系数明显高于L80和N80，且当材料服役50年时抗内压安全系数仍表现出较高的安全裕度。

The corrosion behavior of three casing materials for production,N80,L80,and TP110 TS,was studied in a Huai'an salt cavern gas storage well environment based on corrosion immersion tests in NaCl brine solution. The influence of corrosion on the equivalent stress and residual strength of the casing was analyzed using the finite element method. The results showed that the corrosion rate of all three materials decreases with extended corrosion time. Among them,N80 steel exhibited the highest corrosion rate,while L80 steel showed the lowest corrosion rate and the best corrosion resistance. With increasing salt content in the solution,the corrosion rate of all three materials first increases and then decreases. The average corrosion rate at 70 ℃ is significantly higher than that at 50 ℃,and the corresponding corrosion life of the casing is notably reduced. The internal pressure strength of the casing decreases as corrosion depth increases. The safety factor for internal pressure strength of TP110 TS steel is significantly higher than that of L80 and N80 steels. Even after 50 years of service,TP110 TS steel still maintains a high safety margin. The research results provide a scientific basis for material selection and protection of production casing in salt cavern gas storage wells.