What is it about?

The essence of low-velocity nonlinear porous flow in low-permeability reservoirs is the process of fluid participating in porous flow gradually according to pore throat radius from large to small in pore throats with different radius under the combined action of threshold pressure gradient and pore throat radius sorting. A new nonlinear porous flow equation was established using unequal-diameter parallel capillary bundle model based on pore throat radius sorting of porous media,

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Why is it important?

The nonlinear porous flow equation can not only reveal low-velocity nonlinear porous flow mechanism but also describe the forming process of nonlinear porous flow. Furthermore, the equation is a general equation. Both Darcy’s law and the pseudo-Darcy equation with the threshold pressure gradient in low-permeability reservoirs are the particular cases. The equation has guiding meaning to the research and development of low-permeability reservoirs, especially to well test and reservoir numerical simulation.

Perspectives

The research on porous continuum of reservoir rock is supposed to unify effectively microscopic mechanism with macroscopic performance. I hope that the low-velocity nonlinear porous flow mechanism proposed in this paper can be widely accepted and the new nonlinear porous flow equation can be applied in pratice as soon as possible to solve the practical problems in research and development of low-permeability reservoirs.

Meihua YANG
Southwest Petroleum University

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This page is a summary of: Nonlinear porous flow equation based on pore throat radius sorting of porous media in low-permeability reservoirs, Energy Sources Part A Recovery Utilization and Environmental Effects, July 2019, Taylor & Francis, DOI: 10.1080/15567036.2019.1643952.
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