页岩气体积压裂水平井产能影响因素研究

Research on Factors Influencing Shale Gas Productivity of Volumetric Fractured Horizontal Wells

针对页岩气开发中体积压裂水平井的产能影响因素问题,利用数值模拟技术,在考虑页岩气等温吸附和解吸条件下,建立有限导流页岩气体积压裂水平井开采模型。通过研究天然微裂缝渗透率、基质—微裂缝sigma系数、储层改造体积、人工裂缝导流能力、诱导裂缝导流能力、诱导裂缝密度以及非达西因子等因素对产量的影响,得到人工裂缝导流能力、天然微裂缝渗透率和改造体积大小对累计产气量的贡献率分别为28.66%、22.50%、22.35%,是影响单井产能的最主要的3大因素。气井产能优化设计对页岩气储层改造具有一定指导意义。

In order to figure out the factors influencing shale gas productivity of volumetric fractured horizontal wells,a production model of volumetric fractured shale gas horizontal wells with limited conductivity which considers isothermal adsorption and desorption of shale gas,has been established by numerical simulation. The effect of permeability of natural micro- fractures,sigma coefficient of matrix- micro- fracture,SRV,artificial fracture conductivity,induced fracture conductivity,induced fracture density and non- Darcy factor on shale gas production was looked into,which shows artificial fracture conductivity,permeability of natural micro- fractures and SRV contributing 28. 66%,22. 50%,22. 35% respectively to the gas production,are the three main factors affecting single well productivity. The optimized design of gas well productivity is of guiding significance to the stimulation of shale gas reservoirs.