t. The flow analysis at the micro level has yielded to law for macroscopic flow. It may be used as for general description of filtration at any values of pressure gradient and for establishment the critical values of pressure gradients that define the boundaries of Darcy's law applicability. The influence of parameters as porous media and fluid on the value of the threshold pressure gradients has been investigated. It has been proven that at high pressure gradients Darcy's law works well for low-porous reservoirs and it doesn’t work at all over the range of gradients for high-porous reservoirs. At low gradients the linear filtration law takes place only in high- porous rocks.


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