A method for simulating failure behavior of a geological hydrogen storage well pipe string based on fracture and hydrogen diffusion theory

By combining fracture mechanics and hydrogen diffusion theory with finite element simulation, the hydrogen damage mechanism of hydrogen storage well tubing was simulated, solving the problem of unpredictable hydrogen-induced embrittlement and crack propagation under high pressure, and realizing accurate assessment of tubing damage and prediction of ultimate bearing pressure.

CN122154313APending Publication Date: 2026-06-05SOUTHWEST PETROLEUM UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
SOUTHWEST PETROLEUM UNIV
Filing Date
2026-03-04
Publication Date
2026-06-05

AI Technical Summary

Technical Problem

Existing technologies struggle to accurately predict hydrogen-induced embrittlement and crack propagation in hydrogen storage well tubing under high-pressure conditions, leading to casing failure and making it impossible to effectively assess its failure behavior under multi-physics interaction.

Method used

Using fracture mechanics and hydrogen diffusion theory, combined with finite element simulation software, a user-defined subroutine, VUSDFLD, was developed to simulate hydrogen damage distribution and stress-induced hydrogen enrichment. A three-dimensional finite element mechanical model of the hydrogen storage well tubing was established to analyze the effects of hydrogen concentration and stress on tubing failure.

Benefits of technology

The simulation of damage evolution behavior of hydrogen storage well tubing under different service conditions was realized, and its ultimate bearing pressure was predicted, thus avoiding the risk of material performance degradation caused by hydrogen damage.

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Abstract

A simulation method for failure behavior of a geological hydrogen storage well pipe string based on fracture and hydrogen diffusion theory, characterized in that: the mechanical behavior experiments of the geological hydrogen storage well pipe string in the presence or absence of hydrogen environment are carried out, the fracture strain, fracture energy, hydrogen concentration and distribution, hydrogen penetration depth and stress-strain constitutive relationship of the pipe string material under different hydrogen charging times are obtained; based on the test data, the VUSDFLD subroutine is developed to calculate the hydrogen coverage, wherein the hydrogen concentration distribution control module along the pipe string wall thickness direction, the static water stress accelerated hydrogen diffusion module and the result output module need to be constructed; a three-dimensional finite element mechanical model of the geological hydrogen storage well pipe string is established, the flexible damage and burst failure criterion is used to simulate the elastic-plastic deformation, crack propagation and burst mechanical behavior of the geological hydrogen storage well pipe string, the influence law of hydrogen distribution characteristics and stress accelerated hydrogen diffusion on the failure behavior of the pipe string is analyzed, and the hydrogen damage mechanism and ultimate bearing pressure prediction of the pipe string under the synergistic action of high internal pressure and hydrogen penetration are realized.
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