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中文摘要：
考虑注采交变载荷作用下地下储气库储层的弹塑性变形特性,建立了地下储气库多组分气体动态运移的流固耦合数学模型.利用C＋＋程序语言编制相应计算软件分析了地下储气库注采动态运行过程中回采气中氮气浓度随时间的变化规律.讨论了惰性气体作为垫层气替代比、储层渗透率、孔隙度和地应力等参数对回采气中氮气浓度的影响.计算结果表明：地下储气库天然气注采运移过程中耦合作用十分明显.回采气中氮气浓度随着惰性气体作为垫层气替代比、储层渗透率和孔隙度的增加而增加,随着地应力的增加而减少;但当储层渗透率和孔隙度分别大于300 md和0.2时,回采气中氮气浓度变化不明显.
英文摘要：
The elastic-plastic deformation characteristics of underground gas storage reservoir under the alterna- tive loads, the gas-solid coupling mathematical model of multicompo~ent gas diffusion and seepage are established for the operation of the underground gas storage reservoir. The dynamic change laws of nitrogen concentration in withdrawn gas are calculated based on the proposed model. On this basis, the influences of percentage of cushion that can be replaced by nitrogen gas, reservoir permeability, porosity, and distance between the injector and pro- ducer wells on the nitrogen concentration in withdrawn gas are studied. The examples show that the coupling effect is very significant for gas storage in the underground gas storage reservoir. The nitrogen concentration in withdrawn gas is equidirectional with the increase of percentage of cushion that can be replaced by nitrogen gas, reservoir per- meability and porosity, whereas it decreases with the distance between the injector and producer wells. Reservoir permeability and porosity have only minor impacts on degree of mixing when they are more than 300 md and 0. 2 re- spectively.
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