摘要： 针对盐岩储气库在多年运行下出现的体积收缩、损伤破坏等问题,以金坛盐岩储气库X腔为背景,根据声呐测腔数据建立真实三维几何模型并采用嵌套式双重网格划分,对应力场和温度场作用下储气库运行 10 年期间进行了数值模拟,并通过模拟结果分析了周期注采工况下不同运行年限盐腔体积变形及腔周损伤规律,预测储气库运营期间腔体稳定性薄弱区域.结果表明,与腔体上部相比,腔体中部平滑位置位移变形量较小;随着工作年限的不断增加,同一位置处腔壁位移变形量逐渐增加,但增加的速率逐渐减小;储气库在运营10 年后体积收缩率达到7%左右,运营期中储气库体积收缩情况有逐年减缓的趋势;盐腔中部至顶板处的腔壁突出位置是储气库腔体稳定性的薄弱区域,在盐穴型储气库造腔设计中应避免该区域的产生.

关键词: 多场耦合, 盐岩储气库, 周期性注采, 盐腔体积收缩, 稳定性评价

Abstract: The problem of volume loss and cavern damage of salt cavern gas storages has been studied over many years.Using the Jintan salt cavern gas storage X as an example,a three-dimensional geometrical model was established according to the sonar cavity test results,and a nested double meshing was applied.Numerical simulation of gas storage operations over 10 years has been carried out.By studying the volume deformation and damage of salt cavities in different operating years under periodic injection and production conditions,the weak area of cavity stability during gas storage operation is predicted.The results show that compared with the upper part of the cavity,the displacement deformation of the smooth position of the cavern waist is smaller;With the continuous increase of working life,the displacement and deformation of the cavity wall at the same position gradually increase,and the rate of deformation increase gradually decreases;After 10 years of operation,the volume loss rate of gas storage reaches about 7%,and the volume loss of gas storage tends to slow down in the following years;The protruding position of the cavity wall from the middle of the salt cavity to the top plate is the weak area of the stability of the gas storage cavity,which should be avoided in the cavity design of the salt cavern gas storage.

Key words: multi-field coupling, salt cavern gas storages, periodic injection-production, volume shrinkage of salt cavity, stability evaluations