Coal seam transformation experimental device based on CO2-N2 combined displacement by fracturing

By designing a coal seam transformation experimental device based on fracturing based on CO2-N2 combined displacement, the problem that existing devices cannot experiment with multiple coal samples at the same time and cannot observe the fracturing situation in real time is solved, and an efficient and low-cost coal seam transformation experiment is achieved.

CN120293817BActive Publication Date: 2025-08-22UNIV OF SCI & TECH BEIJING
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Patent Information

Application Number
CN202510779437.8
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2025-06-12
Publication Date
2025-08-22
Estimated Expiration
2045-06-12

AI Technical Summary

Technical Problem

The existing experimental equipment cannot conduct experiments on multiple coal samples at the same time, the experimental efficiency is low, and the coal sample fracturing situation cannot be observed in real time.

Method used

A coal seam transformation experimental device based on fracturing is designed, including a transparent experimental bin, gas supply unit, fracturing liquid unit, water supply unit, gas analysis unit and permeability detection unit. The main shaft is used to drive the coal sample to rotate for detection, and the crack situation is captured in real time through the CT probe.

Benefits of technology

Simultaneous experiments on multiple coal samples are realized, and the fracturing situation of coal samples can be observed in real time, which improves experimental efficiency and reduces equipment costs.

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Abstract

The present invention relates to a coal seam transformation experimental device for CO2-N2 combined displacement based on fracturing, comprising an experimental chamber, wherein the upstream side of the experimental chamber is connected to a gas supply unit, a fracturing fluid unit and a water supply unit, and CO2, N2 and fracturing fluid are respectively injected into a plurality of coal samples in the experimental chamber, and the water supply unit transports water into the experimental chamber to maintain the pressure in the chamber; the downstream side of the experimental chamber is connected to a gas analysis unit, a permeability detection unit and a drain pipe; the experimental chamber is made of a transparent material, and a CT probe is provided on the top for real-time photography of internal cracks in the coal sample; a main rotating shaft is provided in the experimental chamber, and a plurality of support rods are connected to the main rotating shaft, and a coal sample is provided at the free end of each support rod, the outer side of the coal sample is wrapped in a jacket, and the upstream end is connected to the gas supply unit and the fracturing fluid unit through a pipeline, and the downstream end is connected to the gas analysis unit and the permeability detection unit through a pipeline; the coal sample rotates with the main rotating shaft, moves to the bottom of the CT probe in turn, and is tested.
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