通过现场调研、外界环境分析、管道周围土壤理化分析、失效管道理化性能检测等手段，对四川某天然气管道腐蚀穿孔的原因进行了分析。运用Matlab软件拟合出管道腐蚀失效判定公式，并对其进行了验证试验。结果表明：失效管道外壁部分涂层剥离，O₂、CO₂和H₂O与钢管接触发生腐蚀，管道外壁还发生了硫酸盐还原菌腐蚀；管道内壁发生了H₂S、CO₂腐蚀；管道腐蚀失效判定公式具有较好的准确性，由该公式计算得到的爆破压力与验证试验结果误差较小，并预测到其中1个腐蚀坑即将腐蚀穿孔。

The reasons for corrosion and perforation of a natural gas pipeline in Sichuan province were analyzed by means of on-site investigation, external environment analysis, physical and chemical analysis of soil around pipeline and property testing of failed pipeline. A judgement formula of pipeline corrosion failure was fitted by Matlab software, and a test of verification was carried out. The results show that a part of coating on the outer wall of the failed pipeline was peeled off, and then the pipeline steel was corroded in contact with O₂, CO₂ and H₂O, and the outer wall of the pipeline was also corroded by sulfate reducing bacteria. The pipeline corrosion failure judgment formula had good accuracy,as the error between blasting pressure from calculation by the formula and from the verification test result was small. It was predicted that one of the corrosion pits would be corroded and perforated.