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Journal of Chinese Society for Corrosion and protection  2025, Vol. 45 Issue (6): 1698-1708    DOI: 10.11902/1005.4537.2024.409
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Fracture Failure Mechanism of N80 Tubing in Sophisticated CO2 Flooding Production Well Environment
ZHANG Deping1, YAN Lizhen2, YU Yang1, YANG Guangming2(), DAI Chunyu1, MEGN Le1, XU Bo2,3, LIU Zhiyong2()
1 Carbon Dioxide Capture Storage and Enhanced Oil Recovery Development Company, Jilin Oilfield Company, China National Petroleum Co. Ltd. , Songyuan 138000, China
2 Key Laboratory for Corrosion and Protection (MOE), Institute of Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083, China
3 Key Laboratory of Oil and Gas Storage and Transportation Technology, College of Petroleum Engineering, Liaoning Petrochemical University, Fushun 113001, China
Cite this article: 

ZHANG Deping, YAN Lizhen, YU Yang, YANG Guangming, DAI Chunyu, MEGN Le, XU Bo, LIU Zhiyong. Fracture Failure Mechanism of N80 Tubing in Sophisticated CO2 Flooding Production Well Environment. Journal of Chinese Society for Corrosion and protection, 2025, 45(6): 1698-1708.

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Abstract  

Due to the complex corrosion environment of CO2 flooding production wells, there are many corrosion failure cases of tubing in the harsh oil well environment. A comprehensive analysis of failed tubing is helpful to clarify the causes of failure and propose effective protective measures. In this work, the failure behavior and mechanism of N80 tubing in the CO2 flooding production wells are studied by characterizing their microstructure, mechanical properties, corrosion products and surface morphology. The results show that the sulfide stress corrosion cracking of N80 tubing may be caused by the high concentration of Cl-, H2S, CO2 and other substances in the production well liquids and the combined effect of the existed stresses. Crevice corrosion of tubing may be induced by the galvanic effect in the existed crevices inside and outside of the threaded coupling, of which the synergistic effect with stress can also enhance the stress corrosion cracking susceptibility of tubing. Microcracks initiate in pits with high stress concentration on the thread surface and extend to the inner wall. Cl- and sulfides are enriched at the bottom of the pits, the crack tip and the bottom of the thread, providing a driving force for crack propagation. Finally, the cracks quickly penetrate the pipe wall, resulting in brittle fracture and failure of N80 tubing.

Key words:  N80 tubing      screw thread      crevice corrosion      sulfide stress corrosion cracking      failure mechanism     
Received:  25 December 2024     
ZTFLH:  TG172  
Fund: National Natural Science Foundation of China(52071017)
Corresponding Authors:  YANG Guangming, E-mail: D202210739@xs.ustb.edu.cnLIU Zhiyong, E-mail: liuzhiyong7804@ustb.edu.cn

URL: 

https://www.jcscp.org/EN/10.11902/1005.4537.2024.409     OR     https://www.jcscp.org/EN/Y2025/V45/I6/1698

Fig.1  Macroscopic morphology of fractured N80 tubing coupling
Fig.2  Microstructure of failed N80 tubing steel
Fig.3  SEM image (a), corresponding EDS spectra (b) and element mappings (c) of composite inclusion of N80 tubing steel
Fig.4  Stress-strain curves of N80 tubing steel (a) and photos of fractured tensile specimens (b)
Fig.5  Microstructures of the different zones of fracture surface of N80 tubing and corresponding compositions of corrosion products: (a) fracture surface, (b) outer zone, (c) middle zone, (d) inner zone
Fig.6  Morphology of secondary crack on the side of fracture surface of N80 tubing and mappings of main elements corresponding to corrosion products
Fig.7  Cross-sectional morphology of the rust layer existing at the bottom of coupling thread (a) and corresponding EDS element mappings (b)
Fig.8  Main components of corrosion products in the tip (a) and root (b) of crack at the bottom of coupling thread
Fig.9  Morphology of fracture surface of N80 tubing after rust removal: (a) macroscopic morphology, (b-d) microscopic morphology
Fig.10  Microscopic morphologies of the top (a) and bottom (b) of the screw on the fracture side of N80 tubing
Fig.11  Inverse pole figure (IPF) (a) and Kernel average misorientation (KAM) map (b) of secondary crack on the side of fracture of N80 tubing
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