Comprehensive testing device and method for coal bed strain, seepage, displacement and flow jetting

Abstract

The invention discloses a comprehensive testing device for coal bed strain, seepage, displacement and flow jetting. The comprehensive testing device comprises a coal core chamber, a vibrator, an ultrasonic wave generator, a methane gas source, a seepage and displacement gas source, a hand rocking pump, a specific resistance determinator, a gas storing tank, a gas control valve, a bursting disc assembly, a releasing cylinder, a pressure sensor, a high-pressure valve, a drying agent, a gas flowmeter, a strain measurement sealing container and a strain gauge. Meanwhile, the invention further provides a comprehensive testing method for coal bed strain, seepage, displacement and flow jetting. The method comprises the steps of equipment leakage testing, high-pressure gas seepage testing, high-pressure gas displacement testing, high-pressure gas flow jetting testing, specific resistance determining testing and high-pressure strain measuring. The comprehensive testing device is used for carrying out testing of successfully cracking a coal sample after gas seeps a coal core, meanwhile, coal sample gas displacement testing, specific resistance determining of the coal core under high pressureand gas seeping, and coal bed high-pressure strain measuring can be carried out, and therefore the test result is closer to the true situation.

Description

technical field [0001] The invention belongs to a comprehensive test device and method for coal samples, which is used for the test of successfully cracking the coal sample after gas permeates the coal core, and 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 measurement and high-pressure strain measurement of coal seams to 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 it is inevitably subjected to gas seepage. Gas jet fracturing is usually used fo...

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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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