Method for analyzing temperature and pressure evolution of salt cavern hydrogen storage and influence of temperature and pressure evolution on surrounding rock temperature and stress

By analyzing the temperature and pressure evolution of hydrogen before injection into the salt cavity and the coupling effect of the temperature and stress fields of the surrounding rock, the problem of prediction deviation of the temperature and pressure evolution law in the salt cavern hydrogen storage was solved, and accurate analysis of the temperature and stress of the salt cavity surrounding rock was achieved, ensuring the safe operation of the hydrogen storage and risk warning.

CN120671601APending Publication Date: 2025-09-19EAST CHINA JIAOTONG UNIVERSITY
0 Cites 0 Cited by

Patent Information

Application Number
CN202510843082.4
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-06-23
Publication Date
2025-09-19

AI Technical Summary

Technical Problem

During the cyclic injection and production process of salt cavern hydrogen storage, existing technologies fail to effectively consider the temperature and pressure evolution mechanism before hydrogen is injected into the salt cavity and the coupling effect of the surrounding rock temperature field and stress field, resulting in significant deviations between the predicted results of the salt cavity temperature and pressure evolution law and the surrounding rock stress state and the actual working conditions, affecting the reliability of the hydrogen storage safety assessment.

Method used

By quantitatively characterizing the evolution laws of the temperature and pressure fields of hydrogen during pipeline transportation, combined with the Bernoulli equation, Joule-Thomson effect and pipeline friction loss, the pressure fluctuations, temperature gradient distribution and their spatiotemporal evolution characteristics of the salt cavity are analyzed, and an analysis method for the influence of salt cavity temperature and pressure evolution on the temperature and stress of the surrounding rock is established, including expressions for hydrogen injection temperature, mass flow rate, salt cavity pressure evolution, cavity temperature and surrounding rock temperature stress.

Benefits of technology

Accurately predict the temperature conditions when hydrogen is injected into the salt cavity, ensure flow control during the hydrogen injection process, avoid safety issues, provide basic data support for the safe operation of salt cavern hydrogen storage, identify potential mechanical risks, and reduce the probability of accidents.

✦ Generated by Eureka AI based on patent content.
Patent Text Reader

Abstract

The invention relates to the technical field of deep underground energy hydrogen storage, in particular to a method for analyzing temperature and pressure evolution of a salt cavern hydrogen storage and influence of the temperature and pressure evolution on surrounding rock temperature and stress, comprising the following steps: analyzing temperature and mass flow of hydrogen injected into a salt cavity according to pressure change experienced in a process of injecting hydrogen into the salt cavity; obtaining a salt cavity pressure evolution equation according to the mass conservation equation and the mass flow rate of the injected salt cavity, and constructing an intra-cavity temperature evolution equation based on salt cavity-surrounding rock heat exchange, the temperature of the injected salt cavity and the energy conservation equation; establishing a surrounding rock temperature evolution equation according to the mechanism that the surrounding rock temperature changes along with the radial distance, and solving to obtain a surrounding rock temperature calculation formula based on boundary conditions and initial conditions; a cavity surrounding rock displacement and temperature stress expression is obtained according to the cavity geometry and equilibrium equation, the surrounding rock stress-strain relational expression and the displacement and stress boundary conditions, and the influence condition of hydrogen storage reservoir temperature and pressure evolution on the surrounding rock temperature and stress is analyzed through the salt cavity temperature and pressure evolution equation and the cavity surrounding rock displacement and temperature stress expression.
Need to check novelty before this filing date? Find Prior Art