Pore throat recognition method with consideration of pore throat tail end

Abstract

The invention relates to a pore throat recognition method with consideration of a pore throat tail end and in particular to a method for recognizing pores and throats in microscopic visualization model oil displacement experiment images in the field of oilfield development. The method comprises the following steps: carrying out binaryzation treatment on images; carrying out length transformation on space of pores and throats; extracting a center line by using a turning point algorithm; cancelling inner paths in the pores to obtain path curves of the rest of paths; carrying out wavelet noise reduction on the path curves; finding bottleneck positions of the pores and the throats and carrying out pore throat recognition without consideration of the tail end; extracting a center line by using a combustion algorithm and finding the pore throat tail end; extracting a center line of the tail end by using the turning point algorithm by means of an endpoint of a combustion center line of the tail end; and combining the center line of the turning point algorithm and carrying out the pore throat recognition method with consideration of the pore throat tail end. With combination of the combustion algorithm and the turning point algorithm, the tail end part can be independently recognized; the extracted center line is good in centering effect; the relative errors of recognition of the pore throat length are reduced.

Description

technical field [0001] The invention relates to a method for identifying pore throats considering the ends of pore throats, in particular to a method for identifying pores and throats in oil displacement experiment images of microscopic visualization models in the field of oil field development. Background technique [0002] Pores and throats are the main storage spaces for fluids in oilfield development. It is of great significance to study the location of remaining oil in pore throats and the distribution of oil and water to further enhance oil recovery. The pore-throat end refers to the pore-throat space in the porous medium that is connected to other pore-throats by only one channel. Fluid can reach it, but it is difficult to circulate, and it is easy for crude oil to stay and form residual oil. The pore-throat end is one of the important areas for remaining oil to be tapped, and it is necessary to identify the pore-throat end in microscopic experimental images. [0003...

AI Technical Summary

Problems solved by technology

The turning point algorithm is based on length transformation, so the centering effect of the centerline is better, but the centerline at the end of the pore throat cannot be automatically extracted

The combustion algorithm is based on the principle of homotopy refinement, which can preserve the topological structure of the space and accurately identify the end, but the centering effect of the extracted midline is limited, resulting in the short length of the identified throat

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