Method for measuring fractured core interporosity flow coefficient based on CT scanning

Abstract

The invention relates to a method for measuring and calculating a fractured core interporosity flow coefficient based on CT scanning. The method comprises the following steps of obtaining a porosity of a fractured core small column sample, scanning the small column sample to obtain a three-dimensional grayscale image data body of the core for comparison, and adjusting to be consistent with the measured porosity; performing label analysis on the corrected digital core, and separating cracks and matrix pores; for the separated digital core, selecting a volume V1 containing cracks parallel to thedirection of the cracks, solving a crack permeability kf parallel to the direction of the cracks, selecting a matrix volume V2 that does not contain the cracks alongside the volume V1, and taking thepermeability km of the matrix rock perpendicular to the direction of the cracks. The interporosity flow coefficient of the core is calculated using the definition of the interporosity flow coefficient. The method, by directly calculating the interporosity flow coefficient according to the definition of the interporosity flow coefficient, is more intuitive than the method of well test fitting, avoids the multi-solution problem of well test interpretation, and can perform repeated calculations and simulations.

Description

technical field [0001] The invention belongs to the field of analysis of microscopic physical properties of fractured sandstone, and in particular relates to a method for establishing a digital core based on CT scanning technology and calculating and obtaining the channeling coefficient of the fractured core. [0002] technical background [0003] Fractured oil and gas reservoirs contain a large amount of high-quality oil and gas resources, which is the focus of exploration and development at the present stage. A large number of geological studies have found that fractured oil and gas reservoirs have the geological structure characteristics of fracture-porosity dual media, which is manifested by matrix pores serving as storage spaces to supply fluid to fractures. In the dynamic analysis of production, the channeling coefficient is usually used to measure the channeling ability of matrix fluid to fractures. [0004] For fractured oil and gas reservoirs, the method of oil and ...

AI Technical Summary

Problems solved by technology

There are three problems in this method: first, there are multiple solutions in the well test, and different analysts may obtain different evaluation results according to different experiences; It will affect the production of oil and gas wells, and the economy is poor; third, the channeling coefficient obtained from the well test analysis is the embodiment of the average channeling ability, which indirectly reflects the channeling ability through the measurement of pressure, and cannot reflect the real channeling ability through direct means. Channeling from Pores to Fractures in Reservoirs

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