CN101012756A

CN101012756A - Method for increasing gas exhaustion of coal mine bed by hole drilling

Info

Publication number: CN101012756A
Application number: CN 200710084505
Authority: CN
Inventors: 杜志刚
Original assignee: Individual
Current assignee: Individual
Priority date: 2007-02-11
Filing date: 2007-02-11
Publication date: 2007-08-08

Abstract

The invention relates to a method of increasing gas drainage in borehole for coal-mine, characterized in that as high-pressure air throws the pressure to the coal wall of borehole, the permeability between coal seams with low permeability is increased; because of the sudden release of high-pressure air, the coal wall round the borehole is attacked to increase the original crack of coal wall round the borehole growth so that the coal seam with low permeability increases the permeability, the gas in coal seam with low permeability is released more easily, the emission quantity and the drainage quantity of gas in coal seam with low permeability are increased.

Description

The method of increasing gas exhaustion of coal mine bed by hole drilling

Technical field: the method that colliery coal bed drilling reinforcement adds the amount of drawing out methane belongs to the safety of coal mines field, is specially adapted to gas discharge in mine and improves the gas discharge in mine amount.

Background technology: by retrieval comprehensively both at home and abroad, the method of increasing gas exhaustion of coal mine bed by hole drilling mainly is to improve coal bed drilling gas drainage under suction amount by the method that changes coal bed drilling arrangement and increase boring extraction negative pressure, its shortcoming is construction volume and the boring drilling depth amount that has increased boring, and expense increases.Stopping up in the hole then holes will scrap if meet.Can increase electric power and consume and increase the extraction machine utilization and improve the extraction negative pressure.Invented the method for increasing gas exhaustion of coal mine bed by hole drilling in order to address the above problem us.

Main contents: the method for increasing gas exhaustion of coal mine bed by hole drilling is characterized in that the coal bed drilling after the completion is connected with hole packer, hole packer is connected with the high pressure gas bag by quick-acting valve, throw open the fast opening and closing valve between hole packer and the high pressure gas bag then, gases at high pressure pour in the coal bed drilling after the completion suddenly fast, coal bed drilling periphery rib is produced impact, make primary joint of coal bed drilling periphery rib and crack more to educate, thereby make low air permeability coal seam, increased gas permeability, make the easier release of gas in the lower permeability seam, thereby increased the outburst amount and the pumping volume of low air permeability coal seam gas.

The method of increasing gas exhaustion of coal mine bed by hole drilling compared with prior art has the following advantages:

1, method is simple, manages easy to use.

2, energy conservation, non-environmental-pollution, but continuous several times is reused.

3, not only can increase the coal bed gas drainage amount, and can carry out gas bleed, prevent the boring obstruction boring.

4, can measure drilling depth and drilling and sealing quality by the boring air pressure change.

Description of drawings:

Accompanying drawing is the method schematic diagram of increasing gas exhaustion of coal mine bed by hole drilling.

1, coal bed drilling; 2, hole packer;

3, quick-acting valve; 4, high pressure gas bag.

Specific embodiments: existing is the example explanation with the accompanying drawing: coal bed drilling (1) is connected with quick-acting valve (3) by steel pipe after with hole packer (2) sealing of hole, quick-acting valve (3) is connected with high pressure gas bag (4), high pressure gas bag (4) volume is more than ten times of borehole volume, the high-pressure gas pressure of high pressure gas bag (4) is more than the 0.75Mpa, when opening quick-acting valve (3) fast suddenly, suddenly the gases at high pressure of gushing out produce coal bed drilling periphery rib and impact, make primary joint of coal bed drilling periphery rib and crack more to educate, thereby make low air permeability coal seam, increased gas permeability, make the easier release of gas in the lower permeability seam, thereby increased the outburst amount and the pumping volume of low air permeability coal seam gas.Also can move air compressor by ground fixed air compressor or down-hole links to each other and to fetch direct realization said method.

Claims

1, the method of increasing gas exhaustion of coal mine bed by hole drilling is characterized in that: the coal bed drilling after will completing is connected with hole packer, hole packer is connected with the high pressure gas bag by quick-acting valve, throw open the fast opening and closing valve between hole packer and the high pressure gas bag then, gases at high pressure pour in the coal bed drilling after the completion suddenly fast, coal bed drilling periphery rib is produced impact, primary joint and the crack of coal bed drilling periphery rib grown more, thereby make low air permeability coal seam, increased gas permeability, make the easier release of gas in the lower permeability seam, thereby increased the outburst amount and the pumping volume of low air permeability coal seam gas;

2, the method for increasing gas exhaustion of coal mine bed by hole drilling is characterized in that the venthole of big capacity air compressor and the hole packer formation that directly links, when the air pressure of compressor reaches 0.75Mpa when above, valve between instantaneous keying air compressor and the hole packer, by air pressure percussive drilling rib, make rib produce the slit, thereby realize the method for increasing gas exhaustion of coal mine bed by hole drilling.