Automatic drainage device and method for continuous extraction of downward crossing drill hole

Abstract

The invention relates to the technical field of underground drill hole automatic drainage, in particular to an automatic drainage device for continuous extraction of a downward crossing drill hole. Pressure signals of a drainage pipe pressure sensor and an air pressing pipe pressure sensor are collected by a PLC control box, and the opening and closing opportunities of a drainage pipe electric valve and an air pressing pipe electric valve are switched, so that two actions of air pressing and drainage are automatically started after accumulated water in the extraction drill hole reaches a certain degree, and in the process, a water storage section and an extraction section in the extraction drill hole are automatically separated by a one-way water filtering plate, so that the purpose of automatic drainage in the hole during continuous extraction of the downward crossing drill hole is achieved; and according to the automatic drainage device, the automatic drainage device enables the gasextraction drill hole to keep continuous extraction and can automatically drain water in time aiming at the problem of automatic drainage during continuous extraction of the downward crossing drill hole at a water-rich coal rock stratum. The invention further provides an automatic drainage method for continuous extraction of the downward crossing drill hole.

Description

technical field [0001] The invention relates to the technical field of automatic drainage of downhole drilling, in particular to an automatic drainage device and method for continuous drainage of downhole drilling. Background technique [0002] At present, underground gas control in coal mines mainly adopts drilling gas drainage, which is the fundamental measure to eliminate outbursts in outburst mines and the main way to reduce gas emission in high-gas mines. Draining accumulated water in boreholes is the key to improving the effect and guarantee of gas drainage in boreholes. An important measure of borehole integrity. In view of the poor cooling effect of wind slag removal and the easy generation of harmful gases, hydraulic slag removal is often used in the drilling construction process. There is continuous water seepage in the boreholes of coal and rock formations, and it is difficult to drain the accumulated water in the boreholes with large angles and depths for gas dr...

AI Technical Summary

Problems solved by technology

In view of the poor cooling effect of wind slag removal and the easy generation of harmful gases, hydraulic slag removal is often used in the drilling construction process. There is continuous water seepage in the borehole of the coal rock layer, and the angle and depth are relatively large. It is difficult to drain the accumulated water in the borehole for gas drainage at one time.

[0003] The accumulated water in the downward drainage borehole not only blocks the gas escape channel on the borehole wall, but also for the soft coal seam, the long-term accumulated water in the borehole will cause the hole wall to soak and become unstable, resulting in hole collapse and cinder blockage Borehole drainage pipes will further affect the effect of gas drainage. When the hole collapses seriously, it will directly cause the failure of the drainage borehole, which will increase the cost of gas drainage or leave a blank zone of gas drainage in the coal seam, which will form during excavation or mining. Security risks

[0004] The current downward borehole drainage device focuses on intelligence, electronics, and optimization of the extraction device, and there is less optimization of the drainage pipe in the borehole, especially for the existing downward borehole drainage device. For drainage, it is difficult to balance the time of extraction and drainage for drilling holes with a large amount of water. The other type is directly discharged into the extraction pipeline for gas-liquid separation, and the drainage efficiency is low. The gas concentration of the gas will have a great impact, affecting the gas utilization effect

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