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

doi:10.11902/1005.4537.2019.248

Journal of Chinese Society for Corrosion and protection

2020, Vol. 40

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

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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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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

Received: 09 December 2019

ZTFLH:

TG172

Fund: National Key R&D Program of China(2018YFB0605502)

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

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Cite this article:

LI Qing, ZHANG Deping, WANG Wei, WU Wei, LU Lin, AI Chi. 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.

URL:

https://www.jcscp.org/EN/10.11902/1005.4537.2019.248 OR https://www.jcscp.org/EN/Y2020/V40/I4/317

Fig.1 Microstructure of L80 tubing steel

Fig.2 Optical microscopy (a, b) and SEM (c, d) images of corrosion products formed on the outer (a, c) and inner (b, d) walls of L80 tubing steel

Fig.3 EDS results of corrosion products formed on the outer (a) and inner (b) walls of L80 tubing steel

Fig.4 Optical microscopy images of corrosion pits on the outer (a) and inner (b) walls of L80 tubing steel

Fig.5 Corrosion morphologies of the outer (a) and inner (b) walls of L80 tubing steel after the removal of corrosion products

Fig.6 EIS curves of L80 tubing steels exposed in the simulated solution environments with the different contents of water (a) and the different pressures of CO₂ (b) and H₂S (c)

Fig.7 Polarization curves of L80 tubing steels exposed in the simulated solution environments with the different contents of water (a) and the different pressures of CO₂ (b) and H₂S (c)

Fig.8 Stress-strain curves of L80 tubing steel exposed in the simulated solution environments with the differ-ent contents of water (a) and the different pressures of CO₂ (b) and H₂S (c)

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