A device and method for enhancing gas drainage integrated with cutting, sealing and pressure

Abstract

A cutting, sealing and pressure-integrated enhanced gas drainage device and method, the device includes a grouting cylinder connected with each other by threads, a fracturing tube with a number of small holes at the front end is arranged at the center of the cylinder, and the fracturing tube passes through the cylinder The front end of the cylinder front cover is 3-4m, so that all the small holes go over the cylinder, and the rear end of the fracturing tube is connected to the fracturing pump through the fracturing opening on the lower surface of the cylinder. The fracturing opening is 0.5-1m away from the rear end of the cylinder. The first flexible bladder is welded on the front end, and the second flexible bladder is welded at a position 1.5-3m away from the rear end of the cylinder. Several large holes are opened on the surface of the cylinder in the second flexible bladder and the first flexible bladder. The upper part of the cylinder is welded with a grouting pipe, and the surface of the cylinder is provided with a grouting port and a grouting port. Conventional drilling and slotted drilling are arranged respectively through conventional drilling and hydraulic cutting. The grout outlet on the surface of the cylinder injects grout into the coal seam borehole. After the grout solidifies, hydraulic fracturing is carried out to ensure the effective sealing of the borehole for gas drainage integrated with cutting, sealing and pressure, and realize the enhanced gas drainage with integrated cutting, sealing and pressure .

Description

technical field [0001] The invention relates to a cutting, sealing and pressure integrated enhanced gas drainage device and method, which belong to the technical field of gas control in the underground area of ​​coal mines, and are especially suitable for intensifying gas drainage in coal seams with soft, easy-to-collapse and hard-to-seal coal seams. Extraction operations. Background technique [0002] The occurrence characteristics of high gassy and low permeability coal seams in my country are microporosity, low permeability and high adsorption, which often lead to a large amount of gas gushing out during the mining process, especially with the efficient intensification of coal production and the increase in mining depth. The amount of gas gushing out is increasing, and the threat of gas explosion and gas outburst is becoming more and more serious. Therefore, the national coal mine gas control policy determines that high-gas mines must be drained before mining, and gas dra...

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Problems solved by technology

[0003] Technical problem: The purpose of the present invention is to overcome the problems existing in the prior art, such as lax sealing of high-pressure-resistant drilling holes and poor gas drainage effect, and provide a cutting-sealing and pressure-integrated strengthening system with simple operation, low cost and good effect. Gas Drainage Method

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