摘要
从页岩气生产机理着手，分析了页岩气在双重介质中的渗流过程。借助常规双重介质模型，推导了考虑滑脱效应及应力敏感效应的页岩气双重介质渗流模型，并建立了页岩气产量表征公式、页岩气藏中有大量的吸附气，其对气井产能有不可忽略的影响．针对页岩气藏等温吸附特征，结合渗流数学模型．分析了吸附特征对产能的影响、研究结果表明，滑脱效应会增大气井产量，对于页岩储层需要考虑应力敏感的影响，而表皮效应对开发初期影响较大，兰格缪尔体积和压力越大，产量越高；吸附曲线形态越接近于线性，页岩气产量越高基于此可为提高页岩气井产能、规模化开发页岩气提供理论依据。
The process of percolation of shale gas in the dual media is analyzed by starting with the production mechanism of shale gas. A model of shale gas percolation in dual media that takes slippage effect and stress sensitivity into consideration is deduced and a production eharaeterization formula of shale gas is established on the basis of a conventional dual-media model. There is a large number of adsorbed gas in shale gas reservoirs. The adsorbed gas has non-negligible impact on the gas well＇s productivity. In the light of the isothermal adsorption characteristics of shale gas reservoirs, the influence of the adsorption characteristics on the production capacity is analyzed with combination of mathematical model of percolation. The research results show that the slippage effect will increase the production rate of the gas wells. For shale reservoirs, it is necessary to consider the impact of stress sensitivity. The skin effect has a large influence on the early stages of development. The bigger the Langmuir volume and pressure is, the higher the production rate of the shale gas will be. The closer to linear of the adsorption curve shape is, the higher the shale gas production will be. This can provide a theoretical basis for shale gas wells to increase the production capacity, and large-scale development of shale gas.
