Z-3 inhibitor injected by the dropper could decrease drastically corrosion rate of casing and restrain the pit corrosion.These results were observed from hanged sample inner casing in wells.

• 套管挂片分析显示，采用井下点滴加药器加注Z-3缓蚀剂，套管腐蚀明显减缓，而且抑制了点蚀的产生。