1 State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610500, China; 2 Petroleum Engineering School, Southwest Petroleum University, Chengdu 610500, China; 3 Engineering and Technology Research Iustitute, PetroChina Southwest Oil & Gas Field Company, Chengdu 610017, China
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%σs, 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.
侯铎, 吴旭, 肖中玲, 张智, 杨斌, 朱达江. 长宁区块页岩气井N80油管腐蚀损伤特性研究[J]. 材料导报, 2026, 40(6): 25030136-7.
HOU Duo, WU Xu, XIAO Zhongling, ZHANG Zhi, YANG Bin, ZHU Dajiang. Study on the Corrosion Damage Characteristics of N80 Tubing of Shale Gas Wells in the Changning Block. Materials Reports, 2026, 40(6): 25030136-7.
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2026, Vol. 40 
