Oil-gas-water three-phase relative permeability measuring device and method based on microfluidic and image processing

By using microfluidic pore network chips and image processing technology, the problems of large sample consumption and long experimental cycle in the determination of relative permeability of oil, gas and water phases have been solved. Visualization and quantitative determination of three-phase flow at the pore throat scale have been realized, improving experimental efficiency and consistency of results.

CN122409462APending Publication Date: 2026-07-17SOUTHWEST PETROLEUM UNIV
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Patent Information

Application Number
CN202610653279.6
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-05-13
Publication Date
2026-07-17

AI Technical Summary

Technical Problem

Existing technologies make it difficult to observe the three-phase flow process of oil, gas and water in real time at the pore throat scale, and the three-phase relative permeability measurement devices and methods have problems such as large sample consumption, long experimental cycle, high cost and difficulty in quantification.

Method used

By employing a microfluidic pore network chip combined with a fluid injection module, a temperature and pressure control module, a pressure acquisition module, a flow acquisition module, a microscopic imaging module, and a data processing module, synchronous data acquisition and three-phase identification of oil-gas-water three-phase displacement experiments are achieved, and permeability is calculated using a pore throat diagram model.

Benefits of technology

This method enables the quantitative determination of the relative permeability of the three phases of oil, gas, and water at a small sample scale, improving experimental efficiency and visualization capabilities, reducing sample consumption and cost, and enhancing the stability and consistency of the results.

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Abstract

The invention discloses an oil-gas-water three-phase relative permeability measuring device and method based on micro-fluidic and image processing. The device comprises a micro-fluidic pore network chip, and a fluid injection module, a temperature and pressure control module, a chip packaging module, a pressure acquisition module, a flow acquisition module, a microscopic imaging module, a synchronous triggering module and a data processing module. The method comprises the following steps: synchronously acquiring bright field images, oil phase fluorescence images, inlet pressure of each phase, public outlet pressure and injection-production flow data under the same time sequence reference, identifying pixel distribution of three phases of oil, water and gas, mapping the pixel distribution to a pore throat diagram model, calculating an occupation ratio and a connectivity coefficient of each phase, establishing equivalent flow conductivity of each phase, and calculating the equivalent flow conductivity of each phase. And grouping iteration correction is carried out on the flow conductivity correction coefficient in combination with the total flow of the output end under the actually measured pressure boundary to obtain the effective flow of each phase, and then the relative permeability of the oil phase, the water phase and the gas phase is calculated, so that visual characterization and quantitative determination of pore-scale three-phase flow are realized, the sample consumption is reduced, and the test efficiency is improved.
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