盐穴储氢库老井封堵水泥塞-地层界面剥离失效模拟

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中图分类号：TE256文献标识码：ADOI：10.12473/CPM.202408083

Abstract：Toaddress the old well plugged back issue of salt cavern hydrogen storage，based onthe Cohesive zone modeling approach，a 3D finite element model of cement plug-casing-cement sheath-formation system suitable forold well plugged back insaltcavern hydrogen storage was built to simulate the progressive debonding failure of cement plug-formation interface.The simulation results show thatthefracture propagation pressure of hydrogen islowerthanthatof natural gas，indicating that thecement plug-formation interfaceof hydrogen storage is more prone to debonding failure.The cement plug-formation interface debonding length decreases with the increase of the formation temperatureand the formation elastic modulus，but increases with the increaseof the operating pressure.There is a significant positive correlation between the maximum/minimum pressure interval width of the hydrogen storage operationand the debonding length，i.e.，the greater the pressure fluctuation，the greater the debonding length.The weak bond area increases from O to 10% ，and the debonding length increases by 11m ，indicating thatthe debonding length is extremelysensitive to the interfacial cementing strength.The study results pro vide importanttheoretical support for the long-term safe operation of underground salt cavern hydrogen storage.

Keywords： hydrogen energy；salt cavern hydrogen storage； high-temperature and high-pressre environment；debonding failure；bond interface；cementing strength； finite element analysis

0 引言

技术提供了理论依据，也为老井封堵和地层界面稳定性评估提供新的视角。（剩余9346字）