针对目前国内盐矿普遍发育厚夹层的问题,通过室内实验、数值模拟和现场试验,分析厚夹层是否可以垮塌,以实现上下盐层连通,扩大单腔储气空间。分析夹层的水溶机理、水浸后力学参数变化规律后发现:水浸后夹层呈蜂窝状溶解且产生裂缝,利于剥落,剥落残渣占据空间较小;水浸后夹层力学强度明显降低,易发生破坏,有利于夹层垮塌。利用夹层垮塌临界跨度计算模型可预测夹层垮塌时机,通过数值模拟获得了厚夹层垮塌规律,表明夹层厚度越小,夹层埋深、腾空跨度和盐腔高度越大,夹层垮塌的可能性越大。提出了“充分浸泡夹层、二次建槽”的设计思路,针对某储气库12 m厚夹层进行造腔试验设计,并在2口井进行了现场试验,表明厚夹层可以垮塌,且增加了造腔高度,提高了单腔工作气量,具有技术和经济可行性。 In view of the widespread development of thick interlayer in domestic salt mines, whether the thick interlayer can collapse can be analyzed through laboratory experiments, numerical simulations and field experiments in order to make the upper and lower salt layers communicate and expand the single chamber gas storage space. The mechanism of water solubility and the change rule of mechanical parameters after water immersion were analyzed. It was found that the interlayer was honeycomb dissolved and fractured after the water immersion, which was good for the spalling and spalling residues occupying less space. After the immersion, the mechanical strength of the interlayer was obviously reduced and the damage easily occurred , Is conducive to mezzanine collapse. By using the calculation model of the critical span of interlayer collapse, the collapse timing of the interlayer can be predicted, and the law of collapse of thick interlayer is obtained by numerical simulation. The results show that the smaller the interlayer thickness is, the larger the depth of buried interlayer, the span of void and the height of salt cavity are. The design idea of ​​“full immersion interlayer and secondary construction tank” was put forward. The cavity test design was carried out for a 12 m thick interlayer of a gas storage and field tests were conducted in the two wells, indicating that the thick interlayer could collapse and that Increase the cavity height, improve the single chamber working gas, with technical and economic feasibility.