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Investigation on multi-scale pore seepage model of shale gas reservoir considering diffusion and slippage effect
Microfluidics and Nanofluidics ( IF 2.8 ) Pub Date : 2020-09-28 , DOI: 10.1007/s10404-020-02388-6
LiJuan Jiang , HongGuang Sun , Shuai Yang , Yong Zhang , Han Xu

Shale gas reservoirs which are usually heterogeneous ones have a multiplicity mode of occurrence. A comprehensive understanding of the complex migration mechanism is prerequisite to fully comprehend the reservoir seepage. In this paper, the gas flow types are classified based on Knudsen number; the aperture distribution is introduced as the weight coefficient of the comprehensive constitutive equation. Then, the multi-scale pore time fractional order seepage model considering the influence of real gas effect, diffusion effect and slippage effect, is established. The reliability of the new model is verified using the existing experimental data presented in previous literature. Our results show that the new model can accurately capture all the mechanisms of gas migration, and well characterize the influence of structure heterogeneity and real gas effect. Moreover, analysis results also indicate the diffusion effect and slippage effect play a critical role in the multi-scale seepage happened in shale gas reservoir. In conclusion, the new model which considers the real gas effect, diffusion effect and slippage effect, can accurately calculate the apparent permeability, which is a key issue in the production dynamic analysis and productivity prediction of shale gas.



中文翻译:

考虑扩散和滑移效应的页岩气储层多尺度渗流模型研究

通常为非均质的页岩气藏具有多种发生方式。全面理解复杂的运移机制是充分理解储层渗流的前提。本文根据克努森数对气体类型进行分类。引入孔径分布作为综合本构方程的权重系数。然后,建立了考虑实际气体效应,扩散效应和滑移效应影响的多尺度孔隙时间分数阶渗流模型。使用先前文献中提供的现有实验数据验证了新模型的可靠性。我们的结果表明,新模型可以准确地捕获所有气体迁移机理,并很好地表征了结构异质性和真实气体效应的影响。此外,分析结果还表明,扩散效应和滑移效应在页岩气藏多尺度渗流中起着关键作用。综上所述,该模型考虑了实际瓦斯效应,扩散效应和滑移效应,可以准确计算表观渗透率,这是页岩气生产动态分析和产能预测中的关键问题。

更新日期:2020-09-28
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