Coal sample high-pressure strain and carbon dioxide displacement coal seam methane integrated test device

Abstract

The invention discloses a coal sample high-pressure strain and carbon dioxide displacement coal seam methane integrated test device. The device comprises a methane gas source, a carbon dioxide gas source, a sealed strain measurement container, a pressure sensor, a high-pressure valve, a drying agent and a gas flow meter. A vibrator provides vibration for a coal chamber; tan ultrasonic generator provides ultrasonic waves for the coal chamber; a hand pump is used for providing annular and axial pressures for the coal chamber; a resistivity tester is used for measuring the resistivity of a coal sample; the carbon dioxide gas source can inject carbon dioxide gas into the sealed strain measurement container through a pipeline; and the sealed strain measurement container is used for containing the coal sample having the surface pasted with a strain gauge and is connected with a strain gauge through a strain gauge interface to read strain parameters of the coal sample. The device can be usedfor a coal sample permeation test bygas, a carbon dioxide displacement methane test and resistivity measurement of a coal sample under high pressure and gas permeation as well as a strain measurementtest of the coal sample under high pressure.

Description

Technical field [0001] The invention belongs to the technical field of coal sample high-pressure strain and carbon dioxide displacing coal-bed methane test equipment. It is used for high-pressure strain test of coal sample, gas permeation coal sample test, and at the same time carbon dioxide displacing methane test and coal sample under high pressure and gas The resistivity measurement under penetration makes the test result closer to the real situation. Background technique [0002] Gas percolation refers to the flow of gas in porous media. The fundamental difference between gas percolation and liquid percolation is that gas has greater compressibility. In the process of percolation, the volume changes with temperature and pressure. Gas jet refers to the flow of gas ejected from nozzles, orifices, and slits. For coal seam mining, the coal seam is in the underground layer and is unavoidably subject to gas seepage. Gas jet fracturing is usually used for coal seam mining, or carb...

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Problems solved by technology

[0004] Aiming at the limitations of the current test piece box simulating the seepage tests of various gases in coal samples, and the waste of resources for the gas seepage test and the jet test alone, the present invention intends to provide a coal sample high-pressure strain and carbon dioxide displacement coal seam The methane integrated test device can more realistically simulate the gas seepage of coal samples under different pressures, different temperatures and underground waves and other real underground conditions, and can simultaneously conduct gas jet tests to save resources

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