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Coal seam hydraulic pressure jetting breathability-improving system and construction method thereof

A construction method and technology above the coal seam, applied in the direction of earthwork drilling, gas discharge, mining fluid, etc., can solve the problems of not being able to ensure the full overflow of gas gas, affecting the construction period of coal mines, increasing air permeability, etc., and reaching the range of pre-pumping efficiency wide, improve gas drainage efficiency, and increase air permeability

Inactive Publication Date: 2017-02-01
HUAINAN MINING IND GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because the coal seam has been squeezed for many years and has poor air permeability, even if a hole is drilled in the coal seam, it is impossible to ensure that the gas gas can fully overflow. Therefore, in the prior art, the coal seam must be hydraulically fractured before the gas is pumped out. Construction, that is, injecting high-pressure water into the coal seam to fully expand the cracks in the coal seam, thereby increasing air permeability
However, even if this technology is used to increase the gas permeability of the coal seam, it still takes a long time to discharge the gas in the coal seam, which seriously affects the construction period of coal mining

Method used

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  • Coal seam hydraulic pressure jetting breathability-improving system and construction method thereof
  • Coal seam hydraulic pressure jetting breathability-improving system and construction method thereof
  • Coal seam hydraulic pressure jetting breathability-improving system and construction method thereof

Examples

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Effect test

Embodiment 1

[0027] like figure 1 , 2 As shown, a coal seam hydraulic pressure punching anti-permeability system includes a floor roadway 2 located below the coal seam 1, and a plurality of boreholes 7 are set radially in the floor roadway 2 toward the coal seam 1, and the boreholes 7 extend to In the roof above the coal seam 1, the parts of the boreholes 7 in the coal seam 1 are located within 40 meters on both sides of the driving strip 3 of the coal seam 1; a plurality of flushing holes are arranged at intervals between the boreholes 7 6 and fracturing holes 5, each of the fracturing holes 5 passes through the excavation strip 3, and each fracturing hole 5 is arranged at intervals in a line along the extension direction of the excavation strip 3; the fracturing holes 5 The opening is closed and the fracturing hole 5 is provided with a high-pressure water injection device, and the flushing hole 6 is provided with a flushing drill bit 10 . The above-mentioned excavation strip 3 refers t...

Embodiment 2

[0033] A construction method of the hydraulic pressure punching anti-permeability system of the coal seam 1, comprising the following steps:

[0034] Step 1: Transport the drilling rig to the floor tunnel 2, and lay the water supply pipeline and drainage pipeline in the floor tunnel 2;

[0035] Step 2: Drilling 7, calculating the position of the opening of the drilling 7 and the angle of the drilling 7, using the drilling rig to carry out the construction of the drilling 7, ensuring that the parts of each drilling 7 in the coal seam 1 are located on both sides 40 of the driving strip 3 of the coal seam 1 within meters;

[0036] Step 3: Select a drill hole 7 passing through the excavation strip 3 at intervals of 80-120m along the extension direction of the excavation strip 3 as the fracturing hole 5, and seal the fracturing hole 5 and perform water injection construction. The water injection pressure is 15-30Mpa, keep the pressure for 2-4 days after water injection, during thi...

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Abstract

The invention belongs to the technical field of coal mine safety production construction and particularly relates to a coal seam hydraulic pressure jetting breathability-improving system and a construction method thereof. The system comprises a base plate roadway located below a coal seam, and a plurality of drill holes are formed radially in the coal seam direction in the base plate roadway, a plurality of flushing holes and fracturing holes are formed between the drill holes at intervals, each fracturing hole penetrates out of a tunneling strip, and the fracturing holes are formed at interval in a - shape in the tunneling strip extending direction. The fracturing holes are sealed, high-pressure water injection devices are arranged in the fracturing holes, and flushing drill bits are arranged in the flushing holes. Hydraulic punching measures are adopted for a coal seam having undergone hydraulic fracturing, the hydraulic fracturing and hydraulic punching are optimized, the breathability of the coal seam is improved, gas circulation is accelerated, a pre-extraction effect is multiplied, a pre-extraction range is wider, gas is extracted more thoroughly, and an effect is better.

Description

technical field [0001] The invention belongs to the technical field of coal mine safety production and construction, and in particular relates to a coal seam hydraulic pressure punching anti-permeability system and a construction method thereof. Background technique [0002] Before the coal seam is mined, the gas in the coal seam needs to be removed to eliminate the risk of coal seam outburst. This process is called outburst elimination operation in the industry. The coal seam outburst elimination operation mainly needs to drill holes in the coal seam at first, and the boreholes are distributed on the entire extended area of ​​the coal seam, and then the gas in the coal seam is extracted through these boreholes. However, because the coal seam has been squeezed for many years and has poor air permeability, even if a hole is drilled in the coal seam, it is impossible to ensure that the gas gas can fully overflow. Therefore, in the prior art, the coal seam must be hydraulically...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21F7/00E21B43/26
CPCE21F7/00E21B43/26
Inventor 石德洲童碧方有向张敬才田广生马青昂汪峰荣徐涛
Owner HUAINAN MINING IND GRP
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