Device for pumping and draining water from downward hole of coal bed

Abstract

The invention relates to an auxiliary device for a drilling hole for gas drainage, in particular to a device for pumping and draining water from a downward hole of a coal bed, which solves the problems that the accumulated water in the downward hole of the coal bed cannot be drained out in time to influence the effect on gas drainage. The device comprises a liquid draining and pumping pipe, a drilling hole sealing device, and a drainage device provided with a first gate valve and a second gate valve, wherein the upper part of the drainage device is provided with a water inlet and a ventilation bolt of the drainage device, while the lower part is provided with a drainage bolt; the upper end of the drilling hole sealing device is connected with a hole connecting device; the upper end of the liquid draining and pumping pipe is extended in the hole connecting device, and a liquid guiding pipe is connected between the liquid draining and pumping pipe and the water inlet of the drainage device; and one side of the hole connecting device is provided with a first embedded wire pipe, and the second gate valve of the drainage device is connected with a second embedded wire pipe communicated with a gas drainage pipeline. The device can quickly and effectively drain out the accumulated water in the drilling hole to ensure the normal drainage and pumping of the drilling hole, improve the draining and pumping effect of the downward hole (or the drilling hole of a lower adjacent layer) of the coal bed, and reduce the gas content of the coal bed (or the lower adjacent layer) on a working surface; besides, the device has a simple structure and convenient connection and operation.

Description

technical field [0001] The invention relates to an auxiliary device for gas drainage drilling, in particular to a coal seam down hole drainage device. Background technique [0002] In the gas drainage drilling of the downhole (or the hole in the lower adjacent layer) of the coal seam, the problems usually encountered are exactly the problems of water accumulation and slag accumulation in the drilling hole. Since the drilling is carried out in the direction of downhill, due to the high water pressure in a short distance, the drilling slag can be discharged together with the return water, but as the hole depth increases, the ability of the return water to bring slag back becomes weaker and weaker. After the borehole construction is completed, the slag is deposited at the bottom of the borehole and cannot be completely discharged, and the accumulated water fills the entire borehole, which makes the actual effective drainage area of ​​the borehole smaller and seriously affects t...

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problem that the accumulated water cannot be discharged in time and thoroughly in the gas drainage borehole of the existing coal seam down hole, which affects the gas drainage effect, the present invention provides a coal seam down hole drainage device

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