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Drilling device for underground gas holes and drilling method thereof

The technology of a drilling device and a drilling method is applied in the field of drilling devices for underground gas holes, which can solve problems such as easy collapse of underground gas holes, and achieve the effects of stabilizing the rock wall, increasing the extraction volume, and increasing the concentration.

Pending Publication Date: 2019-10-25
田振林
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Problems solved by technology

[0005] Aiming at the problem that the underground gas hole is easy to collapse in the prior art, the present invention provides an underground gas hole drilling device and a drilling method thereof, which can improve the gas hole formation rate, improve the gas drainage efficiency, and improve the gas drainage efficiency. concentration and reduce extraction costs

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  • Drilling device for underground gas holes and drilling method thereof
  • Drilling device for underground gas holes and drilling method thereof

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Embodiment Construction

[0032] The present invention will be further described in detail below in conjunction with the accompanying drawings, which are explanations rather than limitations of the present invention.

[0033] refer to figure 1 and figure 2 , a drilling device for an underground gas hole, comprising a drill pipe 1, a sealing casing 4, a pressure maintaining valve 5, a three-way pipe 6, a dynamic and static combined sealing device 7, a drilling rig 17 and a water slag separation device.

[0034] Wherein, the drill pipe 1 is connected with the drilling rig 17, and the drill pipe 1 has a hollow structure. When drilling, the inner hole of the drill pipe 1 will be used to pressurize and supply the cooling liquid to the hole in the coal rock layer, which is used to clean the end of the drill pipe 1. At the same time, the coolant can flush the cut cuttings out of the drill hole and support the hole wall.

[0035] The hole-sealing sleeve 4 is sealed and fitted at the mouth of the gas hole, t...

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Abstract

The invention discloses a drilling device for underground gas holes and a drilling method thereof. Firstly, sleeve holes are drilled in a drainage area; hole sealing sleeves are fixedly sealed in orifices; then, the hole sealing sleeves are connected with drilling devices; during drilling, the internals of drilled holes are pressurized through hollow drill rods and filled with cooling liquid to achieve a hole wall supporting effect; after holes are drilled through rock layer sections, wall protecting mud is injected in rock layers in a pressurized mode, and a certain static water pressure is formed in the holes to achieve a rock wall stabilizing effect; clear water is used for drilling after entering coal seams; water and slag generated in the drilling process are separated by a water-slagseparation device to realize secondary utilization of resources; after final holes are drilled in, drainage pipelines are replaced in the holes in a pressurized state for flow pressure-reduced drainage; and through the flow pressure-reduced drainage method, the problem of blockage of hole wall gaps by the speed-sensitivity effect can be prevented, the gas quantity attenuation efficiency of the gas holes is reduced, and the gas extracting quantity is increased.

Description

technical field [0001] The invention relates to the technical field of underground gas drainage in coal mines, in particular to an underground gas hole drilling device and a drilling method thereof. Background technique [0002] Gas drainage in high-gas mines can reduce the amount of gas gushing out during mining, reduce gas hazards and various gas accidents, and is a preventive measure to ensure safe production. Gas drainage can reduce the ventilation burden, solve the gas problem that ventilation is difficult to solve, and reduce ventilation costs. Especially for high-gas mines or mining areas, gas drainage is necessary both technically and economically for safety. [0003] The pre-pumping of coal seam gas in this coal seam and the pre-pumping of coal seam gas through bed drilling in bottom pumping roadway are one of the important means for coal mine gas control and prevention of coal and gas outburst. Reduce coal gas pressure and gas content, so as to achieve the purpose...

Claims

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Application Information

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IPC IPC(8): E21B7/00E21B7/20E21B7/18E21B33/03E21B33/13E21B34/02E21B21/015E21F7/00
CPCE21B7/00E21B7/20E21B7/18E21B33/03E21B33/13E21B34/02E21B21/015E21F7/00
Inventor 田振林
Owner 田振林
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