The Simulation Study of Multicycle Injection-production of the Underground Gas Storage in the High Water Cut Reservoir

It is unavoidable of the complex coexistence of gas, water and oil phase in the underground gas storage which is built after the late water flooding of the high water cut sandstone reservoir. This paper does experiments of setting and unsetting pressure of multicycle injection-production experiment using plane visual glass model. The process of the gas operation can be seen intuitively of the anticline structure model, plane homogeneous model and plane heterogeneity model. Moreover, two main influence factors for the efficiency of the gas operation are concluded. The result shows: the capacity of the gas storage and the efficiency of the gas operation are tend to be stable after multicycle injection-production. The efficiency of the gas operation has a closely relationship with reservoir geological features and injection pressure. The conclusion has guiding roles for building and operating underground gas storage of high water cut sandstone reservoir.