CN103306714A

CN103306714A - Gas control method for triple-purpose use of drilled holes in coal floor of close distance seam group

Info

Publication number: CN103306714A
Application number: CN2013102315980A
Authority: CN
Inventors: 郭海军; 王亮; 程远平; 刘亚庆; 滕广平
Original assignee: China University of Mining and Technology CUMT
Current assignee: China University of Mining and Technology CUMT
Priority date: 2013-06-09
Filing date: 2013-06-09
Publication date: 2013-09-18
Anticipated expiration: 2033-06-09
Also published as: CN103306714B

Abstract

The invention discloses a gas control method for triple-purpose use of drilled holes in a coal floor of a close distance seam group, and belongs to coal mine gas control methods. In the coal floor of a mine, drilled holes in the same drill site are used, and gas extraction is performed according to the steps as follows: firstly, before coal mining, gas in a coal seam is extracted in advance through the drilled holes in the coal floor of the mine, and danger of the outburst of coal in the coal seam at the upper part and the gas is eliminated; secondly, the coal at the upper part is mined, when the coal seam at the upper part is mined, mining pressure relief and stress relief are caused to coal seams at the upper part and in the middle, the drilled holes of the original drill site are used, and gas in the coal seams at the upper part and in the middle in a mining pressure relief zone is extracted in a negative pressure manner; and finally, the coal seam in the middle and the coal seam at the lower part are mined, and simultaneously, the original drilled hole is used again, and gas in a mining layer is extracted in the negative pressure manner. The work efficiency can be improved, the gas extraction efficiency is high, the cost is saved, the concentration of the extracted gas is high, and the utilization of the gas is facilitated. The gas control method comprises the control of gas in close distance seam groups of two or more coal seams.

Description

Take out the hole mash gas harnessing method of a hole three usefulness of lane at the bottom of the contiguous seams group

Technical field

The present invention relates to a kind of improvement method of coal mine gas, take out the hole mash gas harnessing method of a hole three usefulness of lane specifically at the bottom of a kind of contiguous seams group.

Background technology

Coal mine gas is one of major casualty that threatens Safety of Coal Mine Production, but gas is again the profuse clean energy resourcies of a kind of reserves simultaneously.Now, the most of collieries of China are are all preventing and treating the gas disaster by extraction, and this not only can realize Safety of Coal Mine Production, can rationally utilize to reduce energy loss to the gas of extracting out again.

At present, many mines all are the methods that adopts the down-hole drilling mash gas extraction, just under coal mine drill site are set, with the suitable coal bed drilling of drilling machine construction or layer-through drilling, to construct again good boring and the extraction pipeline in the tunnel couples together, and utilizes extraction pump extraction coal-bed gas.

But, extraction borehole effect under the coal mine is all more single now, and the actual dynamics of safeguarding is not enough, generally, the gas that rethinks place such as taking out other coal seams or goaf after the gas in the intact coal seam of the extraction hole of will drilling is again especially not only being strengthened workload but also is being spent quite high aspect contiguous seams group's the gas control.

Summary of the invention

The present invention is for avoiding above-mentioned existing in prior technology problem, a kind of gas pumping rate height being provided, and is economical and practical, takes out easily the hole mash gas harnessing method of a hole three usefulness of lane at the bottom of the contiguous seams group of construction.

The object of the present invention is achieved like this, this mash gas harnessing method be applicable to comprise two or more the contiguous seams group of multiple seam implement gas control, concrete grammar is as follows: taking out the boring that utilizes in the lane in the drill site at the bottom of the mine by carrying out gas pumping with the next stage:

Phase I: before seam mining, by the boring in the drill site of taking out the lane at the bottom of the mine, take out the gas in the coal seam in advance, eliminate coal and the gas outburst risk of superjacent;

Second stage: the exploitation superjacent, in superjacent when exploitation, cause coal seam, middle part and underlying seam and adopt release and stress release, utilizes the boring of original drill site, with the mode extraction of negative pressure be in adopt unload in the pressure zone in the middle part of gas in coal seam and the underlying seam;

Phase III: exploitation coal seam, middle part and underlying seam, simultaneously, utilize the goaf gas of the boring negative pressure extraction mined bed of original drill site again;

The boring of taking out at the bottom of the described mine in the drill site in lane will be upward through three layers of coal; Take out at the bottom of the mine that boring in the drill site in lane is omnidistance installs the steel sleeve protection, pass the part in coal seam at steel sleeve and will stamp sieve aperture.

Described coal seam is implemented gas control greater than two layers the contiguous seams group greater than two layers of coal seam.

Beneficial effect: owing to adopted such scheme, 1, a hole three usefulness by boring, the both primary gas in extraction coal seam, pumping and mining pressure relief mash gas again, also the extraction goaf gas has changed traditional fire damp improvement method, has started the new approaches that mine gas is administered in the down-hole drilling extraction; 2, by a hole three usefulness of boring, accomplish once to punch, repeatedly use for a long time, can reduce a large amount of firedamp taking-out discharging drilling engineerings in down-hole and gas drainage under suction tunnel, correspondingly saved the mine gas control expense.

Advantage: this method can be increased work efficiency, and gas pumping rate height is saved cost, and mash gas extraction concentration height makes things convenient for the utilization of gas.

Description of drawings

Figure l is the inventive method schematic diagram.

Fig. 2 flows to schematic diagram for the inventive method phase I coal-bed gas.

Fig. 3 flows to schematic diagram for the inventive method second stage coal-bed gas.

Fig. 4 flows to schematic diagram for the inventive method phase III coal-bed gas.

Fig. 5 is hole structure schematic diagram of the present invention.

Among the figure, the lane is taken out at l, the end; 2, boring; 3, superjacent; 4, coal seam, middle part; 5, underlying seam; 6, steel sleeve; 7, sieve aperture.

The specific embodiment

The present invention be applicable to comprise two or more the contiguous seams group of multiple seam implement gas control, be that example describes the specific embodiment of the present invention with the contiguous seams group who comprises three coal seams below.

Embodiment 1: the concrete grammar for the contiguous seams group who comprises three coal seams is: take out in the lane 1 end of at and every 30m a drill site is set, to the intensive layer-through drilling 2 of each 15m zone construction of superjacent 3 front and back, coal seam 4, middle part and underlying seam 5 are passed in boring 2, and the whole pitch of holes in superjacent 3 is 5m * 5m.Can determine azimuth and the inclination angle of holing by drill site position and whole hole site, thereby construct.Want omnidistance steel sleeve 6 protection of using during construction drill 2, pass the part in coal seam at steel sleeve 6 and will stamp sieve aperture 7.

In concrete the enforcement, utilize boring 2 in the same drill site by carrying out gas pumping with the next stage:

Phase I: before seam mining, by the boring 2 in the drill site of taking out lane 1 at the bottom of the mine, take out the gas in the coal seam in advance, eliminate coal and the gas outburst risk of superjacent 3.

Second stage: exploitation superjacent 3, during superjacent 3 exploitation coal seam, middle part 4 and underlying seam 5 caused and adopt release and stress release, utilize the boring 2 of original drill site, be in to adopt with the mode extraction of negative pressure and unload the gas in the coal seam 4, middle part and underlying seam 5 in the pressure zone.

Phase III: exploitation coal seam 4, middle part and underlying seam 5, simultaneously, utilize the goaf gas of the boring 2 negative pressure extraction mined beds of original drill site again.

Claims

1. take out the hole mash gas harnessing method of a hole three usefulness of lane at the bottom of the contiguous seams group, it is characterized in that: concrete grammar is as follows: utilize boring (2) in the drill site by carrying out gas pumping with the next stage in taking out lane (1) at the bottom of the mine:

Phase I: before seam mining, by the boring in the drill site of taking out lane (1) at the bottom of the mine (2), take out the gas in the coal seam in advance, eliminate coal and the gas outburst risk of superjacent (3);

Second stage: exploitation superjacent (3), in superjacent (3) when exploitation, cause coal seam, middle part (4) and underlying seam (5) and adopt release and stress release, utilize the boring (2) of original drill site, be in to adopt with the mode extraction of negative pressure and unload the gas in the coal seam (4), middle part and underlying seam (5) in the pressure zone;

Phase III: exploitation coal seam (4), middle part and underlying seam (5), simultaneously, utilize the goaf gas of boring (2) the negative pressure extraction mined bed of original drill site again.

2. take out the hole mash gas harnessing method of a hole three usefulness of lane at the bottom of the contiguous seams group according to claim 1, it is characterized in that: the boring (2) of taking out at the bottom of the described mine in the drill site of lane (1) will be upward through three coal seams; Take out at the bottom of the mine that boring (2) in the drill site of lane (1) is omnidistance installs steel sleeve (6) protection, pass the part in coal seam at steel sleeve (6) and will stamp sieve aperture (7).

3. according to taking out the hole mash gas harnessing method of a hole three usefulness of lane at the bottom of the described contiguous seams group of claim l, it is characterized in that: described coal seam is implemented gas control greater than two layers the contiguous seams group greater than two layers of coal seam.