Rock fracturing high pressure gas adsorption test instrument and test method thereof

Abstract

The invention discloses a rock fracturing high pressure gas adsorption test instrument and a test method thereof. The instrument comprises a pressure-bearing pressure head, a bearing limiting device,a constant temperature system, a pressure-bearing pedestal, a fixed unit for fixing and testing a rock test piece, a buffer gas tank, a helium storage tank, a test gas storage tank, an oil pump, an oil circuit, a gas pipeline, a gas-pressure meter and a gas switch. The pressure-bearing pedestal is provided with the constant temperature system and the fixed unit. The bearing limiting device, the fixed unit, the buffer gas tank, the oil pump, the gas-pressure meter, an upper air inlet switch and a lower air inlet switch are arranged in the constant temperature system. The oil pump is connected with the inner cavity of the unit main body of the fixed unit through an oil way. The helium storage tank, the test gas storage tank, a helium switch and a test gas switch are arranged on the externalportion of the constant temperature system. The buffer gas tank is connected to the helium storage tank and the test gas storage tank through helium and test gas pipelines, and the helium and test gaspipelines are provided with the helium switch and the test gas switch. The instrument and the method have characteristics that the structure is simple; assembling is convenient; and work is safe andreliable and so on.

Description

technical field [0001] The invention relates to a rock fracturing high-pressure gas adsorption testing instrument and a testing method thereof. Background technique [0002] The high-pressure adsorption phenomenon of rock gas is of great significance in many fields. For example, the gas high-pressure adsorption of coal rock / shale directly determines the size of coal rock / shale gas reserves, and then determines the economical type of mining projects, while mudstone / salt The high-pressure gas adsorption capacity of rocks is an important evaluation factor for evaluating the gas tightness and gas sealing capacity of rocks, and plays an important role in natural gas storage and carbon dioxide geological storage. In the Chinese invention patent specification CN105043920A, a test method and instrument for measuring rock mass constant temperature adsorption and monitoring rock mass strain are disclosed, which belong to the test method and instrument for rock mass constant temperatur...

AI Technical Summary

Problems solved by technology

At present, the high-pressure adsorption of rock gas is mostly based on the ideal gas equation, and helium is used as the calibration gas for testing. Changes in the stress conditions of rocks in the underground environment, especially the impact of rock cracking and connection path expansion on high-pressure adsorption of rocks under high-stress triaxial fracturing

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