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Volume 14
Issue 8
10.3390/pr14081243
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This is an early access version, the complete PDF, HTML, and XML versions will be available soon.
Article

Study on Buckling Mechanical Behavior of Variable Cross-Section Tubing in Ultra-High-Temperature and High-Pressure Gas Wells

by
Yijun Zhang
1,
Jiaqi Li
1,
Zhipeng Xiang
1,
Hui Zhang
2,3,*,
Boyuan Yang
4,
Xinrui Wang
5 and
Baokang Wu
2,*
1
PetroChina Xinjiang Oilfield Company, Karamay 834000, China
2
College of Petroleum Engineering, China University of Petroleum-Beijing, Beijing 102249, China
3
Oil Production Technology Research Institute, Hainan Institute of China University of Petroleum (Beijing), Sanya 572000, China
4
Changqing Oilfield Company, China National Petroleum Corporation, Xi’an 710018, China
5
China University of Petroleum (Beijing) in Karamay, Karamay 834000, China
*
Authors to whom correspondence should be addressed.
Processes 2026, 14(8), 1243; https://doi.org/10.3390/pr14081243
Submission received: 11 March 2026 / Revised: 4 April 2026 / Accepted: 9 April 2026 / Published: 13 April 2026
(This article belongs to the Section Petroleum and Low-Carbon Energy Process Engineering)
Versions Notes

Abstract

Buckling of variable-diameter tubing strings in ultra-high-temperature and high-pressure (UHTHP) deviated wells presents challenges that cannot be addressed by existing uniform-tubing models. This study develops a segmented Euler–Bernoulli buckling model that accounts for stiffness discontinuities at diameter transitions, temperature–pressure-coupled effective axial force, and wellbore-constraint effects. The model is developed for packer-constrained variable-diameter production tubing under UHTHP gas-production conditions. A global transfer matrix formulation is introduced to derive buckling characteristic conditions and critical loads. Results show that reduced stiffness at diameter transitions facilitates localized buckling and promotes the shift from sinusoidal to helical modes as the effective axial force increases. Variations in tubing or casing inner diameter significantly alter buckling-zone lengths and induce abrupt changes in dogleg severity. The proposed model provides a practical analytical framework for predicting the buckling behavior of variable-diameter tubing strings in UHTHP wells and offers guidance for tubing design and well integrity assessment.
Keywords: UHTHP gas well; buckling; variable-diameter tubing; temperature and pressure coupling; dogleg severity UHTHP gas well; buckling; variable-diameter tubing; temperature and pressure coupling; dogleg severity

Share and Cite

MDPI and ACS Style

Zhang, Y.; Li, J.; Xiang, Z.; Zhang, H.; Yang, B.; Wang, X.; Wu, B. Study on Buckling Mechanical Behavior of Variable Cross-Section Tubing in Ultra-High-Temperature and High-Pressure Gas Wells. Processes 2026, 14, 1243. https://doi.org/10.3390/pr14081243

AMA Style

Zhang Y, Li J, Xiang Z, Zhang H, Yang B, Wang X, Wu B. Study on Buckling Mechanical Behavior of Variable Cross-Section Tubing in Ultra-High-Temperature and High-Pressure Gas Wells. Processes. 2026; 14(8):1243. https://doi.org/10.3390/pr14081243

Chicago/Turabian Style

Zhang, Yijun, Jiaqi Li, Zhipeng Xiang, Hui Zhang, Boyuan Yang, Xinrui Wang, and Baokang Wu. 2026. "Study on Buckling Mechanical Behavior of Variable Cross-Section Tubing in Ultra-High-Temperature and High-Pressure Gas Wells" Processes 14, no. 8: 1243. https://doi.org/10.3390/pr14081243

APA Style

Zhang, Y., Li, J., Xiang, Z., Zhang, H., Yang, B., Wang, X., & Wu, B. (2026). Study on Buckling Mechanical Behavior of Variable Cross-Section Tubing in Ultra-High-Temperature and High-Pressure Gas Wells. Processes, 14(8), 1243. https://doi.org/10.3390/pr14081243

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