Coal seam strain, seepage, displacement and jet comprehensive test device and method

Abstract

The invention discloses a coal seam strain, seepage, displacement and jet comprehensive test device, which includes a coal heart chamber, a vibrator, an ultrasonic generator, a methane gas source, a seepage displacement gas source, a hand pump, a resistivity tester, a storage Gas tanks, air operated valves, rupture disc assemblies, release cylinders, pressure transducers, high pressure valves, desiccants, gas flow meters, strain gauge containments and strain gauges. At the same time, the present invention also provides a comprehensive test method for coal seam strain, seepage, displacement and jet flow, including equipment leak test, high-pressure gas seepage test, high-pressure gas displacement test, high-pressure gas jet test, resistivity measurement test, high-pressure strain Measurement. It is used for the test of successfully cracking the coal sample after the gas permeates the coal core. At the same time, it can also carry out the gas displacement test of the coal sample, the resistivity measurement of the coal core under high pressure and gas penetration, and the high pressure strain measurement of the coal seam, so that the test results are more accurate. close to the real situation.

Description

technical field [0001] The invention belongs to a coal sample comprehensive test device and method, which is used for the test of successfully cracking the coal sample after the gas penetrates into the coal core, and at the same time can also carry out the gas displacement test of the coal sample, the resistance of the coal core under high pressure and gas permeation Rate determination and coal seam high pressure strain measurement make the test results 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, and 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 inevitably subject to gas seepage such as gas. Usually, gas je...

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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 jet flow test alone, the present invention intends to provide a coal seam strain, seepage, displacement and jet flow test The comprehensive test device can more realistically simulate the gas seepage of coal samples under real conditions such as different pressures, different temperatures, and underground waves, and can simultaneously perform gas jet tests, gas displacement tests, strain measurements, and resistivity measurements. to save resources

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