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工程科学与技术:2020,52(5):257-262
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高温高压含O2溴盐完井液中13Cr不锈钢的腐蚀行为研究
(1.北京科技大学 国家材料服役安全科学中心,北京 100083;2.北京科技大学 新材料技术研究院,北京 100083)
Corrosion Behaviors of 13Cr Stainless Steels in O2-contained Bromine Completion Fluids Under High Temperature and High Pressure
(1.National Center for Materials Service Safety, Univ. of Sci. & Technol. Beijing, Beijing 100083, China;2.Inst. for Advanced Materials and Technol., Univ. of Sci. & Technol. Beijing, Beijing 100083, China)
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投稿时间:2019-08-07    修订日期:2019-12-20
中文摘要: 随着越来越复杂开发工艺的应用,油气田现场服役环境也变得更加复杂苛刻,一些现场操作环节(如井下回注CO2、回注采出水、药剂加注、环空注氮、管道试压、维修操作等)不可避免会将O2引入井下环境。O2的混入会导致井下管材发生不可预期的腐蚀风险,尤其对以13Cr不锈钢为代表的耐蚀油套管材,潜在局部腐蚀风险很高。针对溴盐完井液中O2混入导致井下管材腐蚀风险加剧的问题,采用高温高压腐蚀模拟实验,结合扫描电镜、能谱分析等微观表征手段,研究了高温高压含O2环境下不同浓度溴盐完井液中普通13Cr和超级13Cr两种典型不锈钢油套管材的腐蚀行为及机理。结果表明:在高温高压含O2溴盐完井液环境下,两种13Cr不锈钢的腐蚀速率均较高,尤其局部腐蚀速率;参照NACE PR-0775标准,普通13Cr在1.01 g/cm3浓度的溴盐溶液中就已经属于严重腐蚀,并且随着溴盐质量浓度的升高,腐蚀程度不断加剧,在浓度为1.10 g/cm3达到极严重腐蚀;当溴盐质量浓度达到1.40 g/cm3时,两种材料的最大局部腐蚀速率均已超过5 mm/a;微观形貌分析结果表明,溴盐完井液中O2混入对13Cr不锈钢管材的耐蚀性能具有显著影响,这主要是由于O2混入降低了材料表面钝化膜的稳定性,点蚀萌生于材料基体表面致密富Cr钝化膜的破损处,向基体深部发展,蚀坑周边区域有大量腐蚀产物堆积,蚀坑与周边区域存在局部的电偶效应,进一步加速蚀坑的发展。
Abstract:With the application of more and more complex oil and gas production technologies, the field service environment in oil and gas fields has become harsher. Furthermore, some field operations (water injection, agent injection, annular nitrogen injection, reinjection of CO2, pressure testing, etc.) will lead O2 into the downhole environment. O2 is highly corrosive and it may cause some unexpected and severe corrosion risks of the downhole tubing, particularly for 13Cr and some other stainless steels, O2 interfusing can significantly increase the localized corrosion risk and brings a lot of corrosion problems during oil and gas exploitation. In this study, the corrosion behaviors and localized corrosion mechanisms of plain and super 13Cr stainless steels under high temperature and high pressure in O2-contained bromine completion fluids was investigated by corrosion simulation tests and surface characterizations. The corrosion simulation test was performed by high temperature and high pressure autoclave. The corrosion product film that formed on the steel substrate was analyzed by scanning electron microscopy (SEM) and Energy Dispersive Spectroscopy (EDS) techniques. The results showed that both plain and super 13Cr steels exhibit bad corrosion resistance in O2-contained bromine completion fluids with various KBr concentrations. Particularly for localized corrosion rate, the corrosion grades of both plain and super 13Cr steels reach to extremely serious. According to NACE PR-0775 standard, the plain 13Cr steel in the solution of 1.01 g/cm3 reaches the severe corrosion degree, and with the increase of bromine concentration, the degree of corrosion increases, reaching extremely severe corrosion at 1.10 g/cm3. With the increase of bromide concentration, the corrosion rate increases evidently. Even if the super 13Cr stainless steel is subjected to a high bromide concentration, it can still experience severe localized corrosion (> 5 mm/a). The microscopic morphology analysis showed that the pitting initiates at the damaged area of the Cr-rich passive layer on substrate surface. The corrosion products accumulate around the pitting. As a result, a local galvanic effect forms between the pitting and the surrounding area, which further accelerates the propagation of the pitting.
文章编号:201900784     中图分类号:TG174.2    文献标志码:
基金项目:国家自然科学基金项目(51871025)
作者简介:朱金阳(1986-),男,副教授.研究方向:金属材料的腐蚀与防护.E-mail:zhujinyang@ustb.edu.cn
引用文本:
朱金阳,张玉楠,郑子易,许立宁.高温高压含O2溴盐完井液中13Cr不锈钢的腐蚀行为研究[J].工程科学与技术,2020,52(5):257-262.
ZHU Jinyang,ZHANG Yunan,ZHENG Ziyi,XU Lining.Corrosion Behaviors of 13Cr Stainless Steels in O2-contained Bromine Completion Fluids Under High Temperature and High Pressure[J].Advanced Engineering Sciences,2020,52(5):257-262.