Coal and rock mass fracturing device adopting automatic energy storage high-pressure liquid injecting and CO2 phase change pulse

Abstract

The invention discloses a coal and rock mass fracturing device adopting automatic energy storage high-pressure liquid injecting and CO2 phase change pulse. The device is composed of a liquid supplying system, an automatic energy storage high-pressure liquid injecting system, a phase change fracturing system and a datum collecting and control system. The liquid supplying system comprises a liquid state CO2 source, a liquid booster pump and a high-pressure liquid storage temperature control tank; the automatic energy storage high-pressure liquid injecting system comprises a high-pressure liquid injecting cylinder, an energy storage chamber and a phase change chamber; the phase change fracturing system comprises a phase change chamber and a fracturing body; and the datum collecting and control system comprises pressure sensors, temperature sensors, stop valves, safety valves and a control computer. Continuous pulse high-pressure jet flow fracturing is achieved through automatic circulation of the process of liquid injecting, oil bath heating, phase change, energy storage and fracturing, and the coal and rock mass fracturing device is suitable for quick and efficient fracturing of solid materials such as coal, rock, concrete, soil and congelation.

Description

technical field [0001] The present invention relates to a CO 2 A phase change pulse cracking solid device, specifically a liquid CO 2 A device that generates high-pressure gas from phase change to crack coal and rock mass. Background technique [0002] Liquid CO 2 Phase change gas explosion fracturing is an emerging technology that changes the phase of liquid by heating to form gas pressurized fracturing solid materials. It can perform moderate-intensity fracturing on solid materials such as coal and rock mass, concrete, soil, and frozen bodies. In recent years, It has been rapidly developed and promoted in China, especially widely used in various engineering fields, especially for fracturing and anti-permeability of low-permeability oil and gas reservoirs. [0003] The invention patent with the publication number CN203083463U discloses a "carbon dioxide extractor". The structural principle is to inject compressed liquid CO into the assembled sealed blasting tube through ...

AI Technical Summary

Problems solved by technology

[0006] One is that the duration of the peak pressure is short and continuous action cannot be achieved

The volume of the carbon dioxide burst tube is generally about 1.2L, and the liquid CO2 that can be accommodated 2 Very limited, the continuous injection time in one fracturing process is very short, the high pressure maintenance time is even shorter, only tens of milliseconds, the fracturing range is small, the effect is poor, and the fracturing efficiency is low

[0007] The second is that the on-site construction process is prone to interference, for example: the detonation line is easily interfered by the water in the coal seam, which leads to the failure of normal conduction detonation; the drill hole is easy to collapse after blasting, making it difficult to recover the blasting tube, etc.

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