Theoretical prediction of high-risk zone for early temperature cracks in well walls in deep-frozen shafts

Yu, Xinhao; Li, Fangzhen; Zhang, Jiwei; Ding, Hang; Gao, Wei; Zhang, Song

doi:10.1007/s00419-022-02334-8

Cited by 2 publications

(1 citation statement)

References 10 publications

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“…At present, the research on the mechanism of wellbore temperature cracks mainly focuses on temperature field and temperature stress. Li, Zhang and Yu [5][6][7] have established models of the early temperature field and stress field in frozen wellbore walls based on the theory of thermoelasticity. They combined on-site measured data to analyze the evolution laws of the temperature field and stress field, and found that significant temperature stress forms in the early stage of frozen wellbore walls, posing a risk of fracture.…”

Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Study on the Model of Hybrid Fiber Phase Change Concrete Frozen Shaft Wall

Dongwei,

Zhiwen,

Zecheng

et al. 2024

Preprint

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This article adds phase change materials to hybrid fiber concrete innovatively, utilizing the characteristics of phase change materials that can absorb (release) heat during the phase change process, actively responding to complex temperature environments and their changes, reducing the temperature difference inside the concrete, and thus preventing the occurrence of temperature cracks in deep wellbore structures. Through the temperature control model test of the frozen shaft wall, it can be seen that the hybrid fiber phase change concrete (HFPCC) significantly reduces the internal temperature difference, and the maximum temperature difference along the radial direction is 35.84% lower than that of benchmark concrete (BC). The numerical simulation results indicate that a moderate phase transition temperature should be selected in engineering. The phase change temperature should not be close to the ambient temperature and peak temperature. The peak temperature can be reduced by 9.32% and the maximum radial temperature difference can be reduced by 30.89% by selecting an appropriate phase change temperature. The peak temperature and radial maximum temperature difference are both proportional to the latent heat of phase change. The temperature control performance of phase change concrete can be further improved by increasing the latent heat of phase change materials.

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Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Study on the Model of Hybrid Fiber Phase Change Concrete Frozen Shaft Wall

Dongwei,

Zhiwen,

Zecheng

et al. 2024

Preprint

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show abstract

Experimental and numerical study on the model of hybrid fiber phase change concrete frozen shaft wall

Li,

Jia,

Wang

et al. 2024

PLoS ONE

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In this study, phase change materials (PCMs) were innovatively incorporated into hybrid fiber concrete. The properties of PCMs, which absorb and release heat during phase transitions, enable the concrete to actively respond to complex and varying temperature environments. This integration reduces the internal temperature differentials within the concrete, thereby preventing temperature-induced cracks in deep wellbore structures. Through the temperature control model test of the frozen shaft wall, it can be seen that the hybrid fiber phase change concrete (HFPCC) significantly reduces the internal temperature difference, and the maximum temperature difference along the radial direction is 35.84% lower than that of benchmark concrete (BC). The numerical simulation results indicate that a moderate phase transition temperature should be selected in engineering. The phase change temperature should not be close to the ambient temperature and peak temperature. The peak temperature can be reduced by 9.32% and the maximum radial temperature difference can be reduced by 30.89% by selecting an appropriate phase change temperature. The peak temperature and radial maximum temperature difference are both proportional to the latent heat of phase change. The temperature control performance of phase change concrete can be further improved by increasing the latent heat of phase change materials.

show abstract

Theoretical prediction of high-risk zone for early temperature cracks in well walls in deep-frozen shafts

Cited by 2 publications

References 10 publications

Experimental and Numerical Study on the Model of Hybrid Fiber Phase Change Concrete Frozen Shaft Wall

Experimental and Numerical Study on the Model of Hybrid Fiber Phase Change Concrete Frozen Shaft Wall

Experimental and numerical study on the model of hybrid fiber phase change concrete frozen shaft wall

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