A carbon dioxide coalbed methane vibration anti-reflection device

Abstract

The invention discloses a carbon dioxide coal bed gas vibration anti-reflection device. The device achieves multiple detonation and anti-reflection treatment in multiple time periods by setting an inner sleeve and an outer sleeve in a borehole. The first detonated structure is subjected to local anti-reflection or vibration mostly due to less liquid carbon dioxide, and better detonation anti-reflection conditions are provided for the final center detonation. The device adopts the different time and interval detonation methods to improve the internal vibration effect, enhance the effect of thesubsequent detonation and anti-reflection and ensure the anti-reflection effect. The effect of filling the liquid carbon dioxide on site is also achieved. By means of a connecting member, connection between the connecting member and a filling connecting port and a liquid guiding main pipe is facilitated during use. The connection between an installation port and a detonating tube is improved.

Description

technical field [0001] The invention relates to the technical field of anti-permeability equipment, in particular to a vibration anti-permeability device for carbon dioxide coalbed methane. Background technique [0002] The geological structure of coal seams in my country is complex, and the distribution of high gas and low permeability coal seams is relatively common. With the increase of coal mining depth, the in-situ stress will also increase, resulting in a further decrease in the permeability of coal seams. At present, in the process of coal seam gas drainage In the unrelieved coal seam, gas extraction simply by drilling holes is not only time-consuming and labor-intensive, but also the gas extraction effect is very poor. There are two main methods of strengthening and anti-reflection commonly used in the stage. One is to use hydraulic measures to enhance and increase the permeability, such as "hydraulic slotting", "hydraulic punching", "hydraulic fracturing" and "water j...

AI Technical Summary

Problems solved by technology

[0002] The geological structure of coal seams in my country is complex, and the distribution of high-gas and low-permeability coal seams is relatively common. As the mining depth of coal mines increases, the in-situ stress will also increase, resulting in a further decrease in the permeability of coal seams. Currently, in the process of coal seam gas drainage In the coal seams that have not been depressurized, simply relying on drilling to extract gas is not only time-consuming and laborious, but also the gas extraction effect is very poor. In order to improve the gas extraction effect, technicians must adopt some enhanced and anti-permeability methods to promote gas extraction. Now There are two main methods of enhanced anti-reflection commonly used at this stage. One is to use hydraulic measures to enhance anti-reflection, such as "hydraulic cutting", "hydraulic punching", "hydraulic fracturing" and "water jet cutting", etc. , the other is to use blasting measures to strengthen and increase permeability, such as "deep hole loosening blasting" and "deep hole control blasting", the purpose is to create cracks in the coal body through blasting to increase the air permeability of the coal seam

[0003] A Chinese patent discloses a supercritical carbon dioxide permeation enhancement system for low-permeability coal seams (authorized announcement number CN205677660U). To reduce the risk of coal seam outburst and ensure the safe production of coal mines, take floor rock roadway construction through-bed drainage drilling as an example, but it is obviously also applicable to the construction method of using bedding drainage drilling to increase permeability of coal seam, scope of application It is wide and conducive to popularization and application. However, when the common anti-reflection devices on the market use carbon dioxide for anti-reflection, they only rely on the explosive force of pure liquid to gaseous state for anti-reflection. The anti-reflection is completed in an instant. At this moment It is difficult to make the gas release completely, and it is impossible to carry out oscillation processing, and it is impossible to perform anti-reflection processing from multiple angles and multiple time periods, which will have an adverse effect on the release of gas.

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