摘要
在石油开采过程中,氯盐完井液对油管的腐蚀问题一直是研究的热点。为此,考察了超级13Cr不锈钢在模拟的井下条件(130℃,总压40 MPa)下,在不同密度的氯盐完井液(0、1.15、1.25 g/cm^(3))中的应力腐蚀开裂(SCC)敏感性。采用四点弯曲和慢应变率测试(SSRT)相结合的方法来评估材料性能,并利用扫描电子显微镜(SEM)进行断口分析。实验结果表明:在氯盐完井液环境中,超级13Cr不锈钢呈现出一定程度的应力腐蚀敏感性。四点弯曲结果显示随着氯盐浓度的升高,该材料腐蚀加剧,断裂韧性下降,应力腐蚀开裂(SCC)敏感性增加。SSRT结果表明超级13Cr不锈钢在3种浓度完井液中的应力腐蚀开裂敏感性排序为:0 g/cm^(3)<1.15 g/cm^(3)<1.25 g/cm^(3)。超级13Cr不锈钢在高温高压氯盐完井液环境中的应力腐蚀开裂机制为阳极溶解型SCC;且升高的氯离子浓度加速了钝化膜的溶解,并促进了局部腐蚀的发生。
During oil extraction,the corrosion of oil pipes caused by chloride-containing completion fluids has been a hot research topic.To ad-dress this problem,the stress corrosion cracking(SCC)sensitivity of Super 13Cr stainless steel was investigated under simulated downhole conditions(130℃,total pressure 40 MPa)in chloride-containing completion fluids with different concentrations(0,1.15,1.25 g/cm^(3)).A combined method of four-point bending and slow strain rate testing(SSRT)was used to evaluate the material’s performance,and fracture analysis was conducted using scanning electron microscopy(SEM).Results showed that in the chloride-containing completion fluid environ-ment,Super 13Cr stainless steel exhibited a certain degree of stress corrosion sensitivity.The four-point bending results showed that with the increase in chloride concentration,corrosion of the material intensified,fracture toughness decreased,and SCC sensitivity increased.The SSRT results showed that the SCC sensitivity of Super 13Cr stainless steel in the completion fluids with three concentrations was ranked as follows:0 g/cm^(3)<1.15 g/cm^(3)<1.25 g/cm^(3).The stress corrosion cracking mechanism of Super 13Cr stainless steel in high-temperature,high-pressure chloride-containing completion fluid was anodic dissolution-type SCC,and the increased chloride ion concentration accelerated the dissolution of the passive film and promoted the occurrence of localized corrosion.
作者
李珺
于延钊
朱洪章
于晓红
雷博
陈长风
LI Jun;YU Yanzhao;ZHU Hongzhang;YU Xiaohong;LEI Bo;CHEN Changfeng(Jiangsu Changbao Steel Tube Co.,Ltd.,Changzhou 213018,China;College of New Energy of Materials,China University of Petroleum.Beijing 102249,China)
出处
《材料保护》
2025年第11期165-170,共6页
Materials Protection
基金
国家重点研发计划(2022YFB3707504)。
关键词
超级13Cr不锈钢
氯盐完井液
应力腐蚀开裂
super 13Cr stainless steel
chloride-containing completion fluid
stress corrosion cracking
