Ground coal seam gas extraction technology

Abstract

The invention discloses a coal seam gas extraction technology on the ground, which includes a main body, and the main body includes a working vehicle, a working string oil pipe, an underground directional guide tool, a nitrogen generator, nitrogen gas, and a gas collection pipeline. The beneficial effect is: by using high-pressure mixed fluid as the working medium, jet cutting drilling, the rapid expansion of high-pressure bubbles "explodes" to generate continuous shock waves, so that the shock waves can strengthen the coal seam near the radial hole, improve the fluidity of the coal seam near the hole, and realize the Balanced drilling reduces the pollution to the coal seam during the drilling process; the supporting screen made of high-strength PVC material is inserted into the radial hole to support the diversion gas channel, and multiple radial holes form a plum-shaped radial hole. Increase the discharge area of ​​single well coal seam. At the same time, in the process of coal seam gas extraction, the pressure pumping technology is used to inject high-pressure nitrogen into the radial screen in the coal seam through the vertical shaft, dredge the supporting screen, and then extract nitrogen and coal seam gas through negative pressure on the ground.

Description

technical field [0001] The invention relates to a coalbed gas mining technology, in particular to a coalbed gas extraction technology on the ground, and belongs to the technical field of coal mine gas mining. Background technique [0002] With the development of coal mines and the continuous increase of mining depth, the gas content and pressure are increasing, which can easily cause major safety accidents, and the difficulty of safety management is also increasing. At the same time, with the improvement of social civilization, the country and the people have increasingly strict and strong requirements for mine safety. Coal mining enterprises have invested a lot of money and human resources in gas control. Restricted by various factors, the investment in gas control is large, and the ground gas drainage technology has not yet made greater progress. Therefore, in order to solve the above-mentioned problems, the present invention proposes A coal seam gas extraction technology...

AI Technical Summary

Problems solved by technology

Coal mining enterprises have invested a lot of money and human resources in gas control. Restricted by various factors, the investment in gas control is large, and the ground gas drainage technology has not yet made greater progress. Therefore, in order to solve the above-mentioned problems, the present invention proposes A Ground Drainage Coal Seam Gas Technology

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