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

A technology for gas drainage and soft coal seam

Active Publication Date: 2012-07-18
CHINA UNIV OF MINING & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a soft coal seam gas drainage drill hole collaborative drilling an

Method used

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

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Embodiment 1

[0030] Example 1: Coal seam gas drainage hole coordinated drilling and protection integrated system for soft coal seams,

[0031] The system includes: console 2, hydraulic pump station 1, air compressor 4, feed device 6, drill rod 7, hole protection tube 8, polyurethane foam ring 14 and drill bit 11; hydraulic pump station 1 is controlled by high pressure hose 3 The table 2 is connected, and the feeding device 6 is located on the guide groove above the frame 10, and is connected to the console 2 through the high-pressure hose 3; the hole protecting pipe 8 is located inside the drill pipe 7, between the hole protecting pipe 8 and the drill pipe 7 A plurality of polyurethane foam rings 14 are provided, the drill rod 7 is located in the middle of the feeding device 6, a drill bit 11 is installed at the top of the drill rod 7, and a tray 5 is arranged at the tail of the drill rod 7, and the tray 5 is connected to an air compressor 4 through a high pressure hose 3.

[0032] The hole pro...

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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 process, in particular to a soft coal seam gas drainage, drilling, drilling and protection integrated system and process. technical background [0002] 52% of mines in my country are high gas mines, and gas control is a prerequisite for ensuring safe and efficient production of mines. However, the proportion of soft coal seams in my country is very high. The main coal seams in Pingdingshan, Huainan, Huaibei, Guizhou, Sichuan and other mining areas are soft, low permeability, high gas coal seams, and many mines have coal and gas outburst risks. Pre-draining coal seam gas by construction boreholes is an effective means to control gas, and it is also a common measure currently adopted by coal mines in my country. 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 holes will deform, collaps...

Claims

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Application Information

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IPC IPC(8): E21B7/00E21B19/00E21F7/00
Inventor 周福宝高峰刘春王圣程刘应科庞叶青
Owner CHINA UNIV OF MINING & TECH
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