Intrinsically safe carbon dioxide fracturing and displacement integrated system

Abstract

The invention discloses an intrinsically safe carbon dioxide cracking and displacing integrated system. The system comprises a carbon dioxide cracker, a gas source system, a high-pressure pressurizedinjection mechanism, a big-flow medium / low-pressure injection mechanism, a first mining high-pressure hose and a second mining high-pressure hose, wherein the carbon dioxide cracker comprises a constant-pressure cracking sheet and a releasing pipe and the inner cavity of the carbon dioxide cracker does not contain a burning rod, an ignition head and carbon dioxide liquid; the gas source system iscapable of injecting carbon dioxide gas into the carbon dioxide cracker outside a drill hole; two injection holes with different sizes are formed in the tail end of the carbon dioxide cracker; the small injection hole is connected with the high-pressure pressurized injection mechanism; the big injection hole is connected with the big-flow medium / low-pressure injection mechanism; and the high-pressure pressurized injection mechanism and the big-flow medium / low-pressure injection mechanism are connected with the gas source system. The carbon dioxide cracker can be detonated by adoption of a physical method so as to realize the cracking of the working seams, and gas displacing is carried out by means of the carbon dioxide cracker so as to realize the dual purposes of the carbon dioxide cracker.

Description

technical field [0001] The invention belongs to the technical field of coal seam gas extraction equipment, and in particular relates to a safe carbon dioxide fracturing and displacement integrated system. Background technique [0002] The carbon dioxide cracker uses liquid carbon dioxide to heat and gasify and expand, and quickly releases high-pressure gas to break the coal seam. It solves the defects of high destructiveness and high risk in the pre-cracking of explosive blasting mining in the past, and improves coal mining and mining to a certain extent. The safety of pre-splitting, so it is widely used in coal mine operations. [0003] The principle of carbon dioxide cracking is: carbon dioxide exists in a liquid state when it is lower than 31°C, and starts to gasify when it exceeds 31°C, and the pressure is constantly changing as the temperature changes. Taking advantage of the characteristic of carbon dioxide, a certain amount of liquid carbon dioxide (usually about 1.5...

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Problems solved by technology

[0005] Aiming at the limitation that the existing carbon dioxide cracker cracks through the chemical method of combustion, there are still certain safety hazards to coal seam mining, and the carbon dioxide cracker comes with a small amount of liquid carbon dioxide, which is only enough for coal seam cracking. The invention intends to provide an intrinsically safe carbon dioxide fracturing and displacement integrated system

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