Carbon dioxide phase change cracking pressure test device

Abstract

The invention discloses a carbon dioxide phase change cracking pressure test device. The device provided by the invention comprises a base and a sleeve which is vertically arranged on the base. The top end of the sleeve is open. A number of pressure sensors are arranged on the inner wall of the sleeve. A vent hole is arranged in the lower end of the sleeve. The test device further comprises a carbon dioxide phase change cracking device which is vertically arranged in the sleeve. A gap is between the carbon dioxide phase change cracking device and the inner wall of the sleeve, and the gap is filled with a filler. The energy discharge port of the carbon dioxide phase change cracking device is located below the vent hole. The test device further comprises a data acquisition and processing system which is electrically connected with the pressure sensors. According to the invention, the test device can effectively test the explosion venting pressure under the vertical working condition of the carbon dioxide phase change cracking device, can acquire the time history curve of the carbon dioxide phase change explosion venting pressure at different positions and the on-way distribution curve of the carbon dioxide phase change explosion venting pressure at different times, and is of great significance to the point-type energy gathering effect of a carbon dioxide phase change cracking technology.

Description

technical field [0001] The invention relates to the technical field of rock breaking, in particular to a carbon dioxide phase change fracturing pressure testing device. Background technique [0002] With the development of society, urban excavation projects have higher and higher requirements on vibration and environment. Common explosive blasting cannot be used in some cases. Carbon dioxide phase change fracturing technology, as the primary alternative to explosive blasting, has been widely used. Applications. However, because the practical level of carbon dioxide phase change fracturing technology is far higher than the theoretical level, the load research on carbon dioxide phase change fracturing technology is still in its infancy. The existing carbon dioxide phase change fracturing technology research usually uses theoretical calculations to obtain the carbon dioxide phase change fracturing energy, and then converts the phase change fracturing energy into TNT equivalent...

AI Technical Summary

Problems solved by technology

[0004] Since the field test of carbon dioxide phase change fracturing is time-consuming and labor-intensive, and wastes manpower and material resources, it is an economical and quick method to measure the pressure time history curve of carbon dioxide phase change fracturing in the laboratory

Due to the low accuracy of the time-history curves of carbon dioxide phase change fracturing obtained by existing tests, and the carbon dioxide phase change fracturing technology is a point-type energy-concentrating blasting technology, there are certain differences in the pressure time-history curves at different positions in the same section. Therefore, there is an urgent need for a test device and test method that can accurately obtain the time-history curves of carbon dioxide phase change explosion venting pressure at different positions in the borehole under different fracturing parameters, in order to accurately describe the power of carbon dioxide phase change explosion venting, and provide practical information for the field. Applications provide a theoretical basis

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