中文摘要：

模拟某油田腐蚀环境,通过高温高压腐蚀试验,采用金相显微镜、SEM和EDS等手段,研究了QT-900连续油管在井下不同井深的耐蚀性,以及二次入井的腐蚀行为。结果表明：井下油管的腐蚀主要受拉应力和环境介质的综合作用;一次入釜试验后,井深1500m井段腐蚀最严重,局部腐蚀速率达到4.4627mm/a;二次入釜试验后,井深1500 m井段腐蚀急剧增强,均匀腐蚀速率达到1.5549mm/a,约为一次入釜均匀腐蚀速率的3倍。

英文摘要：

The corrosion resistance of QT-900 coiled tubing in different sections of well and secondary into the well in the simulated oilfield corrosion environment was studied by high temperature and high pressure corrosion tests,microscope,SEM and EDS.The results show that corrosion of coiled tubing underground is mainly combined influenced by tensile stress and environmental media.The most serious corrosion occurs in 1500 m underground,and the localized corrosion rate is up to4.4627mm/a after once into the well.The corrosion was dramatically exacerbated after twice into the well that the uniform corrosion rate is up to 1.5549 mm/a,which is about 3 times higher than once into the well.