Permeability sensitivity to stress experiments were conducted on standard core samples taken from Wen 23 Gas Storage at multi-cycle injection and production conditions of the gas storage to study the change pattern of stress sensitivity of permeability. A method for calculating permeability under overburden pressure in the multi-cycle injection and production process was proposed, and the effect of stress sensitivity of reservoir permeability on gas well injectivity and productivity in UGS was analyzed. Retention rate of permeability decreased sharply first and then slowly with the increase of the UGS cycles. The stress sensitivity index of permeability decreased with the increase of cycle number of net stress variations in the increase process of net stress. The stress sensitivity index of permeability hardly changed with the increase of cycle number of net stress variations in the decrease process of net stress. With the increase of cycle number of net stress variation, the stress sensitivity index of permeability in the increase process of net stress approached that in the decrease process of net stress. The lower the reservoir permeability, the greater the irreversible permeability loss rate, the stronger the cyclic stress sensitivity, and the higher the stress sensitivity index of the reservoir, the stronger the reservoir stress sensitivity. The gas zones with permeability lower than 0.3×10⁻³ μm² are not suitable as gas storage regions. Stress sensitivity of reservoir permeability has strong impact on gas well injectivity and productivity and mainly in the first few cycles.

对文23储气库多周期注采条件下取自温23储气库的标准岩心进行渗透率应力敏感性试验，研究渗透率应力敏感性的变化规律。提出了多周期注采过程中上覆压力下渗透率的计算方法，分析了储层渗透率应力敏感性对储气库气井注入和产能的影响。随着储气库循环次数的增加，渗透率保持率先急剧下降，后缓慢下降。在净应力增加过程中，渗透率的应力敏感指数随着净应力变化周期数的增加而降低。在净应力降低过程中，渗透率的应力敏感指数几乎不随净应力变化周期数的增加而变化。随着净应力变化周期数的增加，净应力增加过程中渗透率的应力敏感指数接近净应力减少过程中的渗透率应力敏感指数。储层渗透率越低，不可逆渗透率损失率越大，循环应力敏感性越强，储层应力敏感性指数越高，储层应力敏感性越强。渗透率低于0.3×10的气层 净应力增加过程中渗透率的应力敏感指数接近净应力减少过程中的渗透率应力敏感指数。储层渗透率越低，不可逆渗透率损失率越大，循环应力敏感性越强，储层应力敏感性指数越高，储层应力敏感性越强。渗透率低于0.3×10的气层 净应力增加过程中渗透率的应力敏感指数接近净应力减少过程中的渗透率应力敏感指数。储层渗透率越低，不可逆渗透率损失率越大，循环应力敏感性越强，储层应力敏感性指数越高，储层应力敏感性越强。渗透率低于0.3×10的气层^-3 μm ²不适合作为储气区。储层渗透率的应力敏感性对气井注入能力和产能影响很大，主要影响在前几个周期。