Dynamical classification characterization method and device of states of microspheres in porous medium

Abstract

The invention discloses a dynamical classification characterization method and device of states of microspheres in a porous medium. The method comprises the following steps: measuring particle size distribution of microspheres in different hydration time; fitting according to measurement results to obtain a relation between average particle size of the microspheres and the hydration time; calculating representative tortuosity and pore throat radiuses corresponding to different porosity-permeability reservoirs according to a porosity-permeability relation of a representative reservoir; classifying the microspheres according to size by using a relation between microsphere radius and the pore throat radius; dividing microsphere individual groups into multiple types of pseudo-components according to the hydration time; and respectively characterizing state parameter classification mechanisms of each type of pseudo-components. Through the dynamical classification characterization method and device, the problem of characterization of particle distribution of a microsphere system and a profile control and displacement action mechanism in the profile control process of the microspheres can be solved, so that the plugging mechanism of the microsphere system and the penetration process of the microsphere system in the porous medium are described.

Description

technical field [0001] The invention relates to the technical field of state characterization of polymer microspheres in oil reservoir development and adjustment, in particular to a method and device for dynamic classification and characterization of the state of microspheres in porous media. Background technique [0002] Polymer microsphere deep control and flooding technology is a new technology to enhance oil recovery developed on the basis of polymer flooding technology. It has been widely used in major domestic oil fields, but there is no perfect microsphere technology Due to the characterization scheme of spherical physical parameters, there is no quantitative evaluation method for the effect of polymer microsphere control and flooding to enhance oil recovery. [0003] Compared with blocking agents such as polymers, gels, and CDG (Colloidial Dispersion Gels, colloidal dispersion gels), the microsphere system has obvious particularities. Macroscopically describe its ov...

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Problems solved by technology

[0004] The embodiment of the present invention provides a dynamic grading and characterization method of the state of microspheres in porous media, which is used to solve the problem of characterization of the distribution of particles in the microsphere system and the mechanism of regulation and displacement in the process of microsphere profile control, so that the plugging mechanism of the microsphere system and Percolation processes in porous media are described by:

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