夏季天然气地下储气库的优化运行分析

Optimization of underground natural gas storage reservoir in summer

由于储库地质构造的非均质性以及储层存储和传输流体能力的不同 ,若库内井的注入量不合理 ,可能导致压缩机消耗功率过大 ,甚至局部压力升高过快 ,使天然气溢失甚至发生危险 .通过建立水驱气藏型天然气地下储气库的注采动态数学模型 ,确定出储库注气时的压力、含水饱和度变化的动态特征 ,以储库压缩机站的功率最小消耗量为目标函数 ,以给定时间内城市剩余天然气总额和注入时各单井压力、含水饱和度的限制为约束条件 ,来确定库内各单井的最佳注入量 ,编制出夏季储库最优运行方案 。

By establishing the mathematical model of injection production performance of water-driving underground gas reservoir, the dynamic characteristics of pressure and saturation in reservoir are set up when gas is injected. The minimum power consume at compressor is taken as the objective function in summer, and the total amount of surplus natural gas in a given period and the pressure in each well when injecting and the saturation confinement are taken as restrict conditions, and the optimum operation in summer is set up by use of composite optimum-regulating method, thus providing a theoretical foundation for the optimum operation of a practical underground gas storage reservoir in summer.