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首页> 外文期刊>Journal of natural gas science and engineering >A new triple-porosity multiscale fractal model for gas transport in fractured shale gas reservoirs
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A new triple-porosity multiscale fractal model for gas transport in fractured shale gas reservoirs

机译:一种新的三孔隙多尺度分形模型,用于骨折页岩气藏气体运输

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摘要

A new triple-porosity model is proposed based on the fractal properties, multiscale flow properties, multiple transport mechanisms and multilayer adsorption/desorption in organic matter pores (OMP), inorganic matter pores (IMP), and fracture network (FN). This model is validated by field gas production data and the key factors affecting gas production are explored. Results show that gas flow is of temporal and spatial multiscale. Shale gas is extracted firstly from hydraulic fractures, then FN and IMP, finally OMP. More adsorbed gases are desorbed and surface diffusion is enhanced when gas pressure decreases. Slip flow is the dominate gas transport mechanism in OMP and IMP. The surface diffusion in OMP and the Knudsen diffusion in IMP are not ignorable contributors to gas production. The OMP contributes 21% of gas production in the later stage. This new tripleporosity model is more accurate than single-porosity and dual-porosity models in gas recovery.
机译:基于分形特性,多尺寸流动性,多层传输机制和多层吸附/解吸,在有机物质孔(OMP),无机物质孔(IMP)和断裂网络(FN)中,提出了一种新的三孔隙度模型。 该模型由现场气体生产数据验证,探讨了影响天然气生产的关键因素。 结果表明,气体流量是时间和空间多尺度。 首先从液压骨折,然后Fn和Imp,最终从液压骨折中提取页岩气。 更吸附的气体被解吸,当气体压力降低时,表面扩散增强。 滑动流是OMP和IMP中的主导气体输送机制。 在IMP中的表面扩散和Imp的knudsen扩散不是难以忽视的气体生产贡献者。 OMP在后期贡献了21%的天然气生产。 这种新的三层模型比单孔隙度和天然气回收中的双孔隙率模型更准确。

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