Downward gas extraction drilling hole screw-type drainage device and method

Abstract

The invention provides a downward gas extraction drilling hole screw-type drainage device and method, and relates to the technical field of gas extraction. The drainage device comprises a rotating component, an explosion-proof power device, a connecting assembly and a water collecting tank, wherein the rotating component comprises a plurality of sections, each section comprises an outer pipe and an inner spiral pipe, and the explosion-proof power device drives inner spiral pipes to rotate; a spiral drill rod structure is arranged in the inner spiral pipes, a deep groove ball bearing is arranged between the inner spiral pipes and an outer pipe, and the inner spiral pipes rotate in the outer pipe; and the connecting assembly comprises a sleeve and inner nuts, outer pipes between the sectionsof the rotating component are in threaded connection with each other through a connecting sleeve, the inner spiral pipes are connected through the inner nuts, the water collecting tank is connected with the outer pipe end at a drilling hole opening, and a water outlet is formed in the water collecting tank for drainage. The invention further provides the method for conducting gas extraction drilling hole drainage by means of the device. According to the device and the method, the technical problem that drainage of a downward gas extraction hole with larger length is difficult is solved; and in addition, the device and the method have the advantages of being convenient to operate, good in drainage effect and the like.

Description

technical field [0001] The invention relates to the technical field of gas drainage, in particular to a device for spirally draining large-length downward gas drainage boreholes and a method for using the device to drain downward gas drainage boreholes. Background technique [0002] As the depth of coal seam mining increases, the pressure and content of coal seam gas gradually increase, and gas disasters become more and more serious, threatening the safe and efficient development of mines; at the same time, as a clean resource, industrial production of gas is of great significance. In order to achieve high efficiency, energy saving and emission reduction . Focusing on underground gas disasters, the mine has formulated a twelve-character gas control policy of "draining first, then mining, monitoring and monitoring, and wind to determine production". At present, coal and gas outbursts and high-gas mines have implemented coal seam gas drainage underground. However, during the ...

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Problems solved by technology

[0003] In order to solve the technical problem of difficult long-distance drainage of downward gas drainage boreholes, improve the drainage effect and simplify the drainage construction steps, the present invention provides a downward gas drainage drilling spiral drainage device and method. The specific technical scheme is as follows :

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