Test method for high-voltage electric pulse in-situ fracturing of coal seam cracks and real-time nondestructive observation

Abstract

The invention discloses a test method for high-voltage electric pulse in-situ fracturing of coal seam cracks and real-time nondestructive observation. The test method comprises the following steps: a manufacturing a cylindrical test piece; b installing the test piece in a circular-tube-shaped pressure chamber, connecting pipelines between systems, including a confining pressure loading module and an axial pressure loading module; c operating the axial pressure loading module and the confining pressure loading module in sequence, and applying axial pressure and confining pressure to the test piece; d operating a high-voltage electric pulse fracturing operation system to perform high-voltage pulse discharge, and fracturing the test piece; and e operating an in-situ CT scanning system, performing in-situ scanning on the test piece, and monitoring the internal change of the test piece. The step e can be randomly selected to be carried out after one or more of the steps b, c and d, the in-situ real-time lossless scanning monitoring of the same test piece is realized by operating the step e for many times in the test process, and the real-time lossless observation of the high-voltage electric pulse in-situ fracturing coal seam cracks can be carried out.

Description

technical field [0001] The invention relates to the field of mining of coal bed methane (mine gas), in particular to a test method for in-situ cracking of coal seam fissures by high-voltage electric pulses and real-time non-destructive observation. Background technique [0002] As an emerging reservoir mining technology, high-voltage electric pulse crushing rock technology has been widely used in oil and gas mining, mineral processing, and coalbed methane mining in recent decades. The cracking effect of high-voltage electric pulse is to use the shock wave generated during the discharge process and the mechanical effect caused by the high temperature generated in the plasma channel to break the solid. In the field of coalbed methane (mine gas) mining technology, the high-voltage electric pulse fracturing coal seam fissure technology has a series of advantages such as less energy consumption and high efficiency compared with the previous fracturing coal seam fissure technology...

AI Technical Summary

Problems solved by technology

[0004] Although the existing electric pulse fracturing coal seam fracture system has realized the research on high-voltage electric pulse fracturing coal to a certain extent, it cannot capture the in-situ real-time non-destructive visual information of the loaded specimen during the test , the amount of information obtained during the test is small, which limits the research on the response mechanism of the coal mass during the electric pulse fracturing process, and it is difficult to simulate the in-situ stress environment of the coal mass in deep mining

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