Tensile Property of L80 Steel in Air at 25-350 ℃ and Its Corrosion Behavior in Simulated Casing Service Conditions at 150-350 ℃

doi:10.11902/1005.4537.2022.259

Journal of Chinese Society for Corrosion and protection

2023, Vol. 43

Issue (3): 601-610 DOI: 10.11902/1005.4537.2022.259

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Tensile Property of L80 Steel in Air at 25-350 ℃ and Its Corrosion Behavior in Simulated Casing Service Conditions at 150-350 ℃

ZHOU Zhiping¹, WU Dakang², ZHANG Hongfu³, ZHANG Lei⁴, LI Mingxing³, ZHANG Zhixin⁵, ZHONG Xiankang⁵(

)

^1.PetroChina Changqing Oilfield Company, Xi'an 710018, China
^2.No. 12 Oil Production Plant of PetroChina Changqing Oilfield Company, Qingyang 745100, China
^3.PetroChina Changqing Oilfield Company Oil and Gas Technology Research Institute, Xi'an 710018, China
^4.No. 4 Gas Production Plant of PetroChina Changqing Oilfield Company, Xi'an 710016, China
^5.School of Petroleum and Natural Gas Engineering, Southwest Petroleum University, Chengdu 610500, China

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Abstract

In this article, the tensile fracture behavior of L80 steel in air at 25-350 ^oC and its high-temperature and high-pressure corrosion behavior in CO₂/H₂S in an artificial formation water at 150-350 ^oC are investigated by means of mass loss measurement, scanning electron microscopy, X-ray photoelectron spectroscopy. The results suggest that the yield strength and tensile strength of L80 both appear to severe decline with the increasing temperature, while the decay of the former is significantly greater than that of the latter. Meanwhile, the tensile fracture mechanism of L80 steel changes from microporous aggregation with shear tearing at room temperature to a dominant microporous aggregation at high temperatures. The corrosion rate increases significantly with the increasing temperature, and the higher the temperature, the faster the increase rate. The bilayer structure of the corrosion products and their crystal morphology are markedly affected by temperature, and the percentage of FeS in the inner layer and the compactness of FeCO₃ of the outer layer both increase with the increasing temperature. The results of the study may provide a reference for the evaluation of the adaptability of L80 oil casing for service in extreme conditions.

Key words: high temperature high-temperature tensile fracture mechanism high temperature and high pressure corrosion corrosion products

Received: 17 August 2022 32134.14.1005.4537.2022.259

ZTFLH:

TG174

Fund: Major Science and Technology Project of PetroChina(2021DJ5203)

Corresponding Authors: ZHONG Xiankang, E-mail: zhongxk@swpu.edu.cn

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	ZHOU Zhiping
	WU Dakang
	ZHANG Hongfu
	ZHANG Lei
	LI Mingxing
	ZHANG Zhixin
	ZHONG Xiankang

Cite this article:

ZHOU Zhiping, WU Dakang, ZHANG Hongfu, ZHANG Lei, LI Mingxing, ZHANG Zhixin, ZHONG Xiankang. Tensile Property of L80 Steel in Air at 25-350 ℃ and Its Corrosion Behavior in Simulated Casing Service Conditions at 150-350 ℃. Journal of Chinese Society for Corrosion and protection, 2023, 43(3): 601-610.

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https://www.jcscp.org/EN/10.11902/1005.4537.2022.259 OR https://www.jcscp.org/EN/Y2023/V43/I3/601

Fig.1 Microstructure of L80 casing steel for testing: (a) low magnification, (b) high magnification

Fig.2 Tensile stress-strain curves of L80 steel at different temperatures in atmospheric environment

Fig.3 Variation of tensile strength (a) and plastic deformability (b) of L80 steel with temperature

Fig.4 Macro images of tensile fractures of L80 steel at 25 ℃ (a), 150 ℃ (b), 250 ℃ (c) and 350 ℃ (d)

Fig.5 Micro morphologies of the crack source areas of tensile fractures of L80 steel at 25 ℃ (a), 150 ℃ (b), 250 ℃ (c) and 350 ℃ (d)

Fig.6 Corrosion rates of L80 steel in the simulated conditions with different temperatures

Fig.7 Macro morphologies of L80 steel before and after 7 d corrosion at different temperatures

Fig.8 SEM morphologies of L80 steel after corrosion for 7 d at 150 ℃ (a), 200 ℃ (b), 250 ℃ (c), 300 ℃ (d) and 350 ℃ (e)

Fig.9 SEM morphologies of L80 steel after corrosion for 7 d at 150 ℃ (a), 200 ℃ (b), 250 ℃ (c), 300 ℃ (d) and 350 ℃ (e) and then removing corrosion product films

Fig.10 XPS spectra of corrosion products formed on L80 steel after corrosion for 7 d at 150 ℃ (a, f), 200 ℃ (b, g), 250 ℃ (c, h), 300 ℃ (d, i) and 350 ℃ (e, j)

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