L80油管钢实际腐蚀状况评估及室内电化学和应力腐蚀研究

doi:10.11902/1005.4537.2019.248

中国腐蚀与防护学报

2020, Vol. 40

Issue (4): 317-324 DOI: 10.11902/1005.4537.2019.248

研究报告

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L80油管钢实际腐蚀状况评估及室内电化学和应力腐蚀研究

李清¹^,², 张德平¹^,², 王薇³, 吴伟⁴(

), 卢琳⁴, 艾池¹(

)

1.东北石油大学石油工程学院大庆 163318
2.中国石油吉林油田分公司二氧化碳开发公司松原 138000
3.中国石油吉林油田分公司油气工程研究院松原 138000
4.北京科技大学腐蚀与防护中心北京 100083

Evaluation of Actual Corrosion Status of L80 Tubing Steel and Subsequent Electrochemical and SCC Investigation in Lab

LI Qing¹^,², ZHANG Deping¹^,², WANG Wei³, WU Wei⁴(

), LU Lin⁴, AI Chi¹(

)

1. School of Petroleum Engineering, Northeast Petroleum University, Daqing 163318, China
2. Carbon Dioxide Development Company, Jilin Oilfield Branch of Petrochina, Songyua 138000, China
3. Research Institute of Oil&Gas Engineering, Jilin Oilfield Branch of Petrochina, Songyuan 138000, China
4. Corrosion and Protection Center, University of Science and Technology Beijing, Beijing 100083, China

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摘要:

重点关注了吉林油田中更换的L80油套管的腐蚀行为，通过SEM和体式显微镜对其表面形貌和腐蚀产物进行了分析，同时采用电化学测试和慢应变速率拉伸实验对模拟油井采出液环境中试样的电化学性能和应力腐蚀开裂风险进行了评估。结果表明，在吉林油田服役一段时间后，L80套管钢的外壁腐蚀比较轻微，主要以均匀腐蚀为主，仅有少量的腐蚀产物在表面附着；而L80套管的内壁腐蚀程度相对严重，有一层致密的腐蚀产物覆盖在基体表面，且在产物膜下出现了一定程度的局部腐蚀和点蚀坑，伴随着一些细小的微裂纹。室内研究表明，服役环境中的水分增加、CO₂和H₂S的产生均能加速其电化学过程，从而加速L80钢在油田采出液中的腐蚀。然而，这些因素对其应力腐蚀敏感性影响较小。L80钢在模拟油田采出水环境中具有较好的耐应力腐蚀开裂性能，说明其作为油井中的油套管材料具有较小的应力腐蚀开裂风险。

关键词 ： L80油套管, CO₂/H₂S, 含水率, 应力腐蚀, 点蚀

Abstract：

The work aims to evaluate the risk of corrosion and stress corrosion cracking (SCC) of L80 tubing steel during long-term service in Jilin Oilfield. The surface morphology and corrosion products of L80 tubing steel replaced from Jilin Oilfield were analyzed by SEM and laser confocal microscope. Besides, the electrochemical means and slow strain rate tensile tests were used to evaluate the electrochemical behavior and SCC risk of L80 tubing steel in a simulated oil well production fluid. Results indicated that, after serving for several years, the degree of corrosion on the outer wall of L80 tubing steel was mild and dominated by uniform corrosion accompanied with few corrosion products. In the contrast, the inner wall of the L80 tubing steel was badly corroded with a scale of dense corrosion products, beneath which there existed certain localized corrosion, deep pits, as well as microcracks. The indoor tests indicated that the increase in water content, CO₂ and H₂S accelerated the electrochemical corrosion process, thereby promoting the corrosion in the oilfield produced water, while these factors affected little on the SCC sensitivity. In sum, L80 steel displayed good resistance to SCC in the simulated oilfield produced water environment, implying very low risk of SCC for L80 steel as casing materials for oil well.

Key words： L80 tubing steel CO₂/H₂S water content SCC pitting corrosion

收稿日期: 2019-12-09

ZTFLH:

TG172

基金资助:国家重点研发计划(2018YFB0605502)

通讯作者: 吴伟,艾池 E-mail: wuwei19910117@126.com;aichi2001@163.com

Corresponding author: WU Wei,AI Chi E-mail: wuwei19910117@126.com;aichi2001@163.com

作者简介: 李清，男，1983年生，硕士，高级工程师

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引用本文:

李清, 张德平, 王薇, 吴伟, 卢琳, 艾池. L80油管钢实际腐蚀状况评估及室内电化学和应力腐蚀研究[J]. 中国腐蚀与防护学报, 2020, 40(4): 317-324.
Qing LI, Deping ZHANG, Wei WANG, Wei WU, Lin LU, Chi AI. Evaluation of Actual Corrosion Status of L80 Tubing Steel and Subsequent Electrochemical and SCC Investigation in Lab. Journal of Chinese Society for Corrosion and protection, 2020, 40(4): 317-324.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2019.248 或 https://www.jcscp.org/CN/Y2020/V40/I4/317

图1 L80油管钢金相组织

图2 L80油管钢表面腐蚀产物形貌照片

图3 L80油管钢腐蚀产物EDS分析结果

图4 L80油管钢表面点蚀坑观察

图5 L80油管钢除锈后的腐蚀形貌观察

图6 L80钢在不同条件下的油田模拟液中的电化学阻抗谱

图7 不同条件下L80钢在模拟油田采出水环境中的极化曲线

图8 不同条件下L80钢在模拟油田采出水环境中的应力应变曲线

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