At present,there are few studies on the influence of medium and low water saturation on the capacity of free gas storage.Therefore,this study simulates the multi-round gas injection-soaking-production process through laboratory experiments;The laboratory experiment was carried out to simulate the process of multi-round gas injection-well soaking-production.Combined with the mathematical model and numerical simulation results,the research shows that the reservoir capacity increases with the increase of injection-production rounds,but the increase after single-round injection-production decreases rapidly.When the initial water saturation is higher than 50%,the increase of water saturation is beneficial to the reconstruction of gas storage,but the increase of injection-production capacity and storage capacity is relatively slow in the early stage of reservoir construction.When the initial water saturation is increased from 50%to 85%,the gas saturation is reduced by about 9.27%after 6 injection-production cycles.When the injection-production cycles are increased to 20,30,50 cycles,the free gas storage capacity is increased by about 0.51%,3.33%,6.61%,respectively.The research results are expected to provide reference for the evaluation of injection-production capacity and storage capacity of reservoir-type gas storage.
关键词
自由气库容量/注气-焖井-采气/含水饱和度/注采次数/容积法
Key words
Free gas storage capacity/Injection-well soaking-production/Water saturation/Injection and extraction times/Volumetric method
维普
万方数据