中文摘要：

可扩充的管状的材料的腐蚀行为用一系列电气化学的技术在模仿的 downhole 形成水环境被调查。在在三月申请以后的真实 downhole 环境的腐蚀形态学被 stereology 显微镜学也观察并且扫描电子显微镜学(SEM ) 。结果证明与 unexpanded 样品相比，铁酸盐的区域在 7.09% 扩大以后戏剧性地增加。扩展材料显示出在电气化学的阻抗光谱学(EIS ) 的曲线和一个更低的腐蚀电阻在每学习温度阴谋的在极化当前的更高的腐蚀。在扩大前后的坚定的批评 pitting 温度(CPT ) 是 87.5h

英文摘要：

The corrosion behavior of expandable tubular materials was investigated in simulated downhole formation water environments using a series of electrochemical techniques. The corrosion morphologies in the real downhole environment after three months of application were also observed by stereology microscopy and scanning electron microscopy （SEM）. The results show that, compared with the unex- panded sample, the area of ferfite increases dramatically after a 7.09% expansion. The expanded material shows a higher corrosion current in the polarization curve and a lower corrosion resistance in the electrochemical impedance spectroscopy （EIS） plot at every studied tempera- ture. The determined critical pitting temperatures （CPT） before and after expansion are 87.5℃and 79.2℃, respectively. SEM observations demonstrate stress corrosion cracks, and CO2 corrosion and H2S corrosion also occur in the downhole environment. Due to additional defects generated during the plastic deformation, the corrosion performance of the expanded tubing deteriorates.