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• W3010030260 endingPage "364" @default.
• W3010030260 startingPage "364" @default.
• W3010030260 abstract "Low-permeability porous medium usually has asymmetric distributions of pore sizes and pore-throat tortuosity, thus has a non-linear flow behavior with an initial pressure gradient observed in experiments. A threshold pressure gradient (TPG) has been proposed as a crucial parameter to describe this non-linear flow behavior. However, the determination of this TPG is still unclear. This study provides multi-scale insights on the TPG in low-permeability porous media. First, a semi-empirical formula of TPG was proposed based on a macroscopic relationship with permeability, water saturation, and pore pressure, and verified by three sets of experimental data. Second, a fractal model of capillary tubes was developed to link this TPG formula with structural parameters of porous media (pore-size distribution fractal dimension and tortuosity fractal dimension), residual water saturation, and capillary pressure. The effect of pore structure complexity on the TPG is explicitly derived. It is found that the effects of water saturation and pore pressure on the TPG follow an exponential function and the TPG is a linear function of yield stress. These effects are also spatially asymmetric. Complex pore structures significantly affect the TPG only in the range of low porosity, but water saturation and yield stress have effects on a wider range of porosity. These results are meaningful to the understanding of non-linear flow mechanism in low-permeability reservoirs." @default.
• W3010030260 created "2020-03-13" @default.
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• W3010030260 date "2020-03-02" @default.
• W3010030260 modified "2023-09-25" @default.
• W3010030260 title "Multi-Scale Insights on the Threshold Pressure Gradient in Low-Permeability Porous Media" @default.
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• W3010030260 doi "https://doi.org/10.3390/sym12030364" @default.
• W3010030260 hasPublicationYear "2020" @default.
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