针对胜坨油田T128断块高温高盐油藏油井井筒腐蚀严重问题，研制了泵下多级长效缓蚀器。优选牺牲阳极复合材料XS3，实现了缓蚀器逐级释放缓蚀剂;研制了固体缓蚀剂，缓蚀率达78.7%，满足缓蚀器多级填料需求。现场应用表明，缓蚀剂溶解速率能够满足地层水腐蚀速率要求，可以有效保护井筒和油井管柱。
In this paper, a multi-stage long-acting corrosion inhibitor under the pump was developed in consideration of the problem of severe corrosion of wellbore in the high-temperature and high-salt oil reservoir in Fault Block T128 in Shengtuo Oilfield. The corrosion inhibitor was gradually released by optimal selection of sacrifice anode composite XS3, and the solid corrosion inhibitor was synthesized and the inhibition ratio was as high as 78.7%, which met the requirements of the multi-stage filling of the corrosion inhibitor. Field application shows that the dissolution rate of the corrosion inhibitor can meet the corrosion rate requirement of formation water. It can effectively protect the wellbore and oil well casing string.
