长庆油田重点腐蚀区单一内防腐蚀技术无法满足现场需要。本工作介绍了长庆油田低合金耐蚀管材的优选,通过室内高温高压试验和现场挂环试验,对其耐蚀性进行了评价,并在油田现场实现了规模应用。结果表明:各因素中温度对腐蚀速率影响最大,相同腐蚀条件下,宝钢和包钢生产的5Cr低合金耐蚀钢的平均腐蚀速率和局部腐蚀速率较N80钢分别低50%以上和40%以上,其预测寿命可达10a,5Cr低合金钢是有效降低长庆油田重点腐蚀区域局部腐蚀且经济的选材方案。

Single internal anti-corrosion technology in key corrosion areas of Changqing oilfield cannot meet the needs of on-site. This paper introduced the optimization of low alloy corrosion-resistant pipe in the oilfield, which evaluated the corrosion resistance through indoor high temperature and high pressure test and field hanging ring test, and realized large-scale application on-site. The results showed that temperature had the greatest effect on the corrosion rate. Under the same corrosion conditions, the average corrosion rate and local corrosion rate of 5Cr low alloy corrosion resistant steel produced by Baosteel and Baotou Steel was lower than those of N80 steel by more than 50% and 40%, respectively, and its predicted life could reach 10 years. 5Cr low alloy corrosion resistant steel is an effective and economical material selection scheme to reduce local corrosion in key corrosion areas of Changqing oilfield.