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Down-hole coal bed air-pressing helix drilling tools and drilling method using the same

An auger rod and screw technology is applied in the field of underground coal-layered air auger drilling equipment and the drilling field using the equipment, which can solve the problems of difficult drilling construction, small hole forming depth, broken hole and stuck drilling, etc. Hole speed and gas drainage effect, improve hole depth and porosity rate, and ensure the effect of safe production

Inactive Publication Date: 2008-02-27
CHINA COAL TECH & ENG GRP CHONGQING RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, for coal seams with complex occurrence conditions, high gas content, high in-situ stress, severe structural damage, dramatic thickness changes, and a large number of outburst dangerous coal seams, especially soft coal seams, drilling construction is very difficult
Not only the depth of the hole is small, but also the accident of hole collapse and sticking is easy to occur

Method used

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  • Down-hole coal bed air-pressing helix drilling tools and drilling method using the same
  • Down-hole coal bed air-pressing helix drilling tools and drilling method using the same

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Embodiment Construction

[0025] The present invention will be further described in detail below in conjunction with the drawings.

[0026] Referring to Figure 1, Figure 5 and Figure 6, the underground coal bed air spiral drilling machine of the present invention includes a pump station 1, an operating table 2, a frame 3, a moving device 4 arranged on one end of the frame rail, and a device The power head 5 on the mobile device, the clamper 6 arranged on the other end of the frame, the clamper 6, the power head 5 and the mobile device 4 are respectively connected to the pumping station through the operating platform through the oil pipe;

[0027] One end of the air supply switching device 7 is connected to the power head 5, and its compressed air input port 7-1 is connected to the mine air pressure system; one end of the hollow spiral drill rod 8 is connected to the other end of the air supply switching device 7, and the other end It extends through the holder 6 and is connected to the two-stage combined d...

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Abstract

The present invention relates to compressed air underground coal bed drilling auger, which includes one pump station, one operating console, one machine frame, one traveling unit, and one power head set on the traveling unit. The underground coal bed drilling auger features the air feeding change-over unit with one end fitting to the power head and one compressed air inlet connected the mine air compressing system, the hollow auger stem with one end connected to the air feeding change-over unit and the other end stretched through one gripper, and the two-stage combined drill fitting to the hollow auger stem. The underground coal bed drilling auger has rotation speed of the power head controlled in 180-650 rpm, homogeneous drilling rate controlled in 0.5-1 m / min, and air feeding pressure maintained in 0.2-0.75 MPa. The present invention has great hole forming depth, high hole forming rate, high hole forming rate and high gas exhausting effect.

Description

Technical field [0001] The invention relates to coal mine drilling equipment and a use method thereof, in particular to a downhole coal seam air spiral drilling machine and a method for drilling using the machine, and is particularly suitable for soft outburst coal seams. Background technique [0002] Gas drainage is a fundamental measure to prevent coal and gas outbursts and reduce gas explosion accidents. Since the 1980s, the grid-type cross-layer drilling drainage method has played a very important role in preventing coal and gas outburst and reducing gas emission in vast high gas and outburst mines. Compared with through-bed drilling, bedding drilling has the following advantages: drilling completely along the coal seam, with high drainage efficiency; drilling through production roadways can be used to save auxiliary rock tunnels; drilling construction speed is faster and construction cost low. However, the hole length of the bedding drilling is an important factor that affec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21F7/00E21B3/00E21B10/44E21B17/22
Inventor 孙东玲林府进梁运培董钢锋张军郭恒欧聪苗法田
Owner CHINA COAL TECH & ENG GRP CHONGQING RES INST CO LTD
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