关键词: 储气库, 相渗特征, 注采模拟, 岩心渗流, 储层流体, 驴驹河, 大港油田

Abstract: In order to deeply study the percolation law of gas-water phase fluid in the process of multicycle injection and production in Banqiao area of Dagang Oilfield, the reservoir core of Luju River gas storage in this area is taken as the object to make experimental studies on reservoir fluid phase permeability and core seepage characteristics of reservoir injection-production simulation. The results show that the gas-water phase permeability lag phenomenon occurs after many times of gas-water interactive displacement, and the pore throat in some areas of the pore system is small, which leads to the phase permeability lag phenomenon is more obvious; in the periodic injection-production process of the reservoirs, the gas drive water pure gas zone is affected by liquid carrying expansion action, the gas storage space is increased; the gas-water transition zone is affected by gas-water interlock action, the gas phase seepage and utilization rate are reduced. This study can not only provide a scientific basis for dynamic analysis, prediction, adjustment, oil recovery improvement, capacity parameters design and operation safety of Luju River gas storage, but also lay a foundation for numerical simulation study and analysis of gas storage in the later stage. The purpose of accurately evaluating and predicting the productivity of gas storage is achieved.

Key words: gas storage, phase permeability characteristics, injection and production simulation, core seepage, reservoir fluid, Luju River, Dagang Oilfield