Tight reservoir liquid phase apparent permeability calculation method and device

Abstract

The invention discloses a tight reservoir liquid phase apparent permeability calculation method and device. The method comprises the steps of acquiring basic parameters of a tight reservoir to be analyzed, determining the corresponding relationship between the capillary length and the average pore diameter in the tight reservoir to be analyzed by adopting a fractal theory according to the basic parameters, constructing a single capillary nanopore liquid flow model in the tight reservoir to be analyzed according to the corresponding relationship, wherein the single capillary nanopore liquid flow model considers a slip effect, constructing a fluid flow model of the tight reservoir to be analyzed according to the single capillary nano-pore liquid flow model, and calculating the permeability of the tight reservoir to be analyzed according to the hydrodynamic model and a Darcy law. According to the calculation method, the slip effect is considered, so that the deviation generated by predicting the apparent permeability of the tight reservoir by adopting continuous fluid mechanics and slip-free boundary conditions is reduced, and the calculation accuracy of the liquid-phase apparent permeability of the tight reservoir is improved.

Description

technical field [0001] The invention relates to the field of petrochemical technology, in particular to a method and device for calculating the liquid phase apparent permeability of tight reservoirs. Background technique [0002] Fracturing fluid flowback is the last step in hydraulic fracturing operations, and the flowback rate significantly affects the production of gas wells in tight reservoirs, and the flowback rate of fracturing fluid in some wells is less than 50%. The special migration mechanism of fluid in the nanopores of tight reservoirs is considered to be an important reason for the low flowback rate. It is of great significance to improve the understanding of the apparent permeability of tight reservoir liquid phase to understand the low flowback rate of fracturing fluid in tight reservoirs. [0003] In the prior art, the Lucas-Washburn model is used to study the flow of fluid in nanopores. The Lucas-Washburn model assumes that the flow of fluid in a capillary ...

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Problems solved by technology

[0005] In view of this, the present invention provides a method and device for calculating the liquid phase apparent permeability of tight reservoirs, which are used to solve fluid property changes in micro-nano confined spaces and flow slip boundary conditions, using continuum fluid mechanics There will be a huge deviation in the prediction of the apparent permeability of tight reservoirs with the no-slip boundary condition

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