High-voltage electric pulse in-situ anti-reflection gas-bearing reservoir two-phase seepage test method

Abstract

The invention discloses a high-voltage electric pulse in-situ anti-reflection gas-bearing reservoir two-phase seepage test method. The method comprises the following steps: step a, manufacturing a cylindrical test piece; b, installing the test piece is installed in a circular-tube-shaped pressure chamber, and connecting pipelines between systems; c, operating the axial pressure loading module and the confining pressure loading module in sequence; d, operating the water-gas two-phase seepage system; the sum of the steam pressure applied to the test piece in the step d is constantly smaller than the axial pressure and the confining pressure applied to the test piece in the step c; e, operating a high-voltage electric pulse fracturing operation system to perform high-voltage pulse discharge, and fracturing the test piece; and f, detecting a water and gas fluid flow change curve of the test piece in the pressure maintaining stress environment through a flow data acquisition module, implementing the step f before and after the step e respectively, and judging the effect of the high-voltage electric pulse fracturing test piece by comparing water and gas fluid flow data measured by the liquid flow meter and the gas flow meter before and after the step e, so that a high-voltage electric pulse in-situ anti-reflection gas-bearing reservoir two-phase seepage test can be carried out.

Description

technical field [0001] The invention relates to the field of mining of coalbed methane (mine gas), in particular to a high-voltage electric pulse in-situ anti-permeability test method for two-phase seepage in gas-bearing reservoirs. Background technique [0002] As an emerging reservoir anti-reflection 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 coal seam anti-reflection technology, the high-voltage electric pulse coal seam anti-reflection technology has a series of advantages such as less energy consumption and high efficiency compared with the previous coal seam anti-reflection technology. At present, high-v...

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Problems solved by technology

[0004] Although the existing electric pulse fracturing permeability enhancement system has realized the research on the high-voltage electric pulse fracturing coal body to a certain extent, it is unable to perform in-situ permeability enhancement and seepage on the loaded specimen during the test and obtain real-time Information, 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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