Gas extraction and drilling cooperative drilling and protecting integrated system for soft coal seams and process

Abstract

A gas extraction and drilling cooperative drilling and protecting integrated system for soft coal seams and process belong to soft coal seam cooperative drilling and protecting systems and process. The gas extraction and drilling cooperative drilling and protecting integrated system mainly consists of a control table, a hydraulic pump station, an air compressor, a feeding device, a drill stem, a hole protecting tube, a drill bit and the like. The hole protecting tube is located in the drill stem, and the hole protecting tube and the drill stem are synchronously connected and drill cooperatively. The depth of a drilled hole is equal to the length of the hole protecting tube. Finally, the hole protecting tube penetrates through the drill bit, and the drill stem is withdrawn while the hole protecting tube is remained in the hole to realize functions of supporting a hole wall and extracting gas. The system and the process are convenient in operation, the hole protecting tube and the drill stem realize cooperative drilling and protecting, the hole protecting tube is easy to be remained in the drilled hole, problems that the hole collapses and the hole protecting tube is difficult to be fed to the drilled hole can be resolved, the hole protecting depth is high, the hole wall can be supported more effectively, deformation and collapse are prevented, accordingly high gas extraction concentration and flow of the soft coal seams are guaranteed, and the gas extraction and drilling cooperative drilling and protecting integrated system for soft coal seams and the process are particularly applicable to quite soft coal seams with the value of the firmness factor f smaller than 0,3.

Description

technical field [0001] The invention relates to a soft coal seam coordinated drilling and protection system and technology, in particular to a soft coal seam gas drainage drilling and protection integrated system and technology. technical background [0002] 52% of mines in my country are high-gas mines, and gas control is a prerequisite for ensuring safe and efficient mine production. However, the proportion of soft coal seams in my country is very high. The main mining coal seams in Pingdingshan, Huainan, Huaibei, Guizhou, Sichuan and other mining areas are all soft, low permeability, and high gas coal seams, and many mines have the risk of coal and gas outburst. Pre-extraction of coal seam gas by construction drilling is an effective means of gas control, and it is also a measure commonly adopted by coal mines in my country at present. But in the coal seam firmness coefficient f In extremely soft coal seams with a value less than 0.3, more than 90% of the gas drainage h...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a soft coal seam gas drainage drill hole collaborative drilling and protection integrated system and technology to solve the problem of difficult feeding of the soft coal seam protection pipe

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