长宁区块页岩气井N80油管腐蚀损伤特性研究

doi:10.11896/cldb.25030136

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Abstract In order to investigate the corrosion damage characteristics of N80 tubing in different well sections, high-temperature autoclave was employed to simulate the corrosive medium environment corresponding to different well sections, and weight loss corrosion experiments for 168 hours as well as constant-load stress corrosion tests were conducted. The corrosion products on the surface of N80 tubing after corrosion were analyzed using XRD, SEM, and EDS to determine their composition, surface morphology, and elemental composition. Additionally, the 3D microscopic morphology of local corrosion pits was measured. Tensile tests were performed to analyze the degree of stress corrosion damage of N80 tubing. The results showed that:The uniform corrosion rate of N80 tubing reached a maximum value of 1.000 5 mm/a at a temperature of 100 ℃ and a CO₂ partial pressure of 0.18 MPa, indicating a significant corrosion risk. In a multi-factor coupled corrosive environment, N80 tubing primarily underwent CO₂ corrosion, with the main corrosion product being FeCO₃. At a bottom-hole temperature of 120 ℃, the rapid precipitation of FeCO₃ facilitated the formation of a dense protective film, which effectively protected the matrix of N80 tubing. At a temperature of 80 ℃, a CO₂ partial pressure of 0.12 MPa, and a tensile load of 60%σ_s, the stress corrosion damage of N80 tubing was the most severe, with reduction rates of tensile strength and yield strength of 7.02% and 8.11%, respectively. Close attention should be paid to the safety risks of the string at this well section.

Key words： shale gas N80 tubing multi-factor synergistic corrosion corrosion damage

Published: 25 March 2026 Online: 2026-04-03

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TE98

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	Articles by authors
	HOU Duo
	WU Xu
	XIAO Zhongling
	ZHANG Zhi
	YANG Bin
	ZHU Dajiang

Cite this article:

HOU Duo,WU Xu,XIAO Zhongling, et al. Study on the Corrosion Damage Characteristics of N80 Tubing of Shale Gas Wells in the Changning Block[J]. Materials Reports, 2026, 40(6): 25030136-7.

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https://www.mater-rep.com/EN/10.11896/cldb.25030136 OR https://www.mater-rep.com/EN/Y2026/V40/I6/25030136

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