CN103306714B

CN103306714B - Gas control method for drilling hole and hole three-purpose in close-range coal seam group bottom drainage roadway

Info

Publication number: CN103306714B
Application number: CN201310231598.0A
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: 2016-01-27
Anticipated expiration: 2033-06-09
Also published as: CN103306714A

Abstract

A gas control method for drilling holes and three purposes in a bottom drainage roadway of a close-distance coal seam group belongs to a coal mine gas control method. In the mine bottom suction roadway, gas extraction is carried out by using drill holes in the same drill site according to the following stages: firstly, before coal seam mining, pre-pumping gas in the coal seam through a drill hole in a mine bottom pumping roadway drill site, and eliminating coal and gas outburst danger of an upper coal seam; secondly, mining an upper coal seam, mining the lower coal seam and the middle coal seam to release pressure and stress during mining the upper coal seam, and extracting gas in the middle coal seam and the lower coal seam in the mining pressure relief zone in a negative pressure mode by using the drill holes of the original drill site; and finally, mining the middle coal seam and the lower coal seam, and simultaneously, pumping and extracting the gas in the goaf of the mining layer by using the original drill hole in a negative pressure mode. The working efficiency can be improved, the gas extraction rate is high, the cost is saved, the extracted gas concentration is high, and the utilization of the gas is convenient. Gas remediation of close-range coal seam groups containing two or more coal seams.

Description

Coal seam group with near interval Di Chou holes in lane the mash gas harnessing method in a hole three

Technical field

The present invention relates to a kind of administering method of coal mine gas, hole the mash gas harnessing method in a hole three in a kind of coal seam group with near interval Di Chou lane specifically.

Background technology

Coal mine gas is one of major casualty threatening Safety of Coal Mine Production, but gas is again the clean energy resource that a kind of reserves enrich very much simultaneously.Now, the most of colliery of China is is all preventing and treating Gas Disaster by extraction, and this not only can realize Safety of Coal Mine Production, can carry out Appropriate application to reduce energy loss again to the gas extracted out.

At present, many mines are all the methods adopting down-hole drilling mash gas extraction, namely arrange drill site at underground coal mine, with drilling machine construction along coal bed drilling or layer-through drilling, again the extraction pipeline in the boring of having constructed and tunnel is coupled together, utilize drainage pump draining coal seam gas.

But, the extraction borehole effect of present underground coal mine is all more single, and the actual dynamics safeguarded is inadequate, under normal circumstances, rethink after the gas in the complete coal seam of extraction take out local gas such as other coal seam or goafs etc. will drilling again, in the gas control of coal seam group with near interval, especially not only increase workload but also cost is quite high.

Summary of the invention

The present invention is the problem for avoiding existing for above-mentioned prior art, provides a kind of gas pumping rate high, economical and practical, holds easy working coal seam group with near interval Di Chou lane and to hole the mash gas harnessing method in a hole three.

The object of the present invention is achieved like this, the coal seam group with near interval that this mash gas harnessing method is applicable to comprise two or more coal seam implements gas control, and concrete grammar is as follows: in mine Di Chou lane, utilize the boring in drill site to carry out gas pumping by with the next stage:

First stage: before seam mining, by the boring in the drill site in mine Di Chou lane, take out the gas in coal seam in advance, the coal and gas prominent eliminating superjacent is dangerous;

Second stage: exploitation superjacent, to cause coal seam, middle part and underlying seam during superjacent exploitation and adopts release and stress release, utilize the boring of original drill site, is in the gas adopted in release drainage in coal seam, middle part and underlying seam with the mode extraction of negative pressure;

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

Boring in the drill site in described mine Di Chou lane will be upward through three layers of coal; Boring whole process in the drill site in mine Di Chou lane installs steel sleeve protection, will stamp sieve aperture at steel sleeve through the part in coal seam.

Described coal seam is greater than two layers, implements gas control at the coal seam group with near interval being greater than two layers of coal seam.

Beneficial effect: owing to have employed such scheme, 1, by boring hole three use, the both primary gas in extraction coal seam, pumping and mining pressure relief mash gas again, also extraction goaf gas, changes traditional fire damp administering method, has started the new approaches that mine gas is administered in a down-hole drilling extraction; 2, by hole three use of boring, accomplish once to punch, repeatedly Long-Time Service, can reduce a large amount of firedamp taking-out discharging drilling engineering in down-hole and gas drainage under suction tunnel, correspondingly save mine gas control expense.

Advantage: the method can be increased work efficiency, gas pumping rate is high, cost-saving, and mash gas extraction concentration is high, facilitates the utilization of gas.

Accompanying drawing explanation

Figure l is the inventive method schematic diagram.

Fig. 2 is that the inventive method first stage coal-bed gas flows to schematic diagram.

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

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

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

In figure, l, Di Chou lane; 2, hole; 3, superjacent; 4, coal seam, middle part; 5, underlying seam; 6, steel sleeve; 7, sieve aperture.

Detailed description of the invention

The coal seam group with near interval that the present invention is applicable to comprise two or more coal seam implements gas control, is described below for the coal seam group with near interval comprising three coal seams to the specific embodiment of the present invention.

Embodiment 1: the concrete grammar for the coal seam group with near interval comprising three coal seams is: in Di Chou lane 1, a drill site is set every 30m, constructed intensive layer-through drilling 2 in 15m region each before and after superjacent 3, boring 2 is through coal seam, middle part 4 and underlying seam 5, and the whole pitch of holes in superjacent 3 is 5m × 5m.Azimuth and the inclination angle of boring can be determined by drill site position and borehole bottom location, thus construct.Want the omnidistance steel sleeve 6 that uses to protect during construction drill 2, sieve aperture 7 will be stamped at steel sleeve 6 through the part in coal seam.

In concrete enforcement, the boring 2 in same drill site is utilized to carry out gas pumping by with the next stage:

First stage: before seam mining, by the boring 2 in the drill site in mine Di Chou lane 1, take out the gas in coal seam in advance, the coal and gas prominent eliminating superjacent 3 is dangerous.

Second stage: exploitation superjacent 3, when superjacent 3 is exploited, coal seam, middle part 4 and underlying seam 5 are caused and adopt release and stress release, utilize the boring 2 of original drill site, be in the gas adopted in release drainage in coal seam 4, middle part and underlying seam 5 with the mode extraction of negative pressure.

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

Claims

1. hole the mash gas harnessing method in a hole three in a coal seam group with near interval Di Chou lane, it is characterized in that: exploitation superjacent, in Di Chou lane, a drill site is set every 30m, constructed intensive layer-through drilling in 15m region each before and after superjacent, boring is through coal seam, middle part and underlying seam, and the whole pitch of holes in superjacent is 5m × 5m;

Concrete grammar is as follows: in mine Di Chou lane (1), utilize the boring (2) in drill site to carry out gas pumping by with the next stage:

First stage: before seam mining, by the boring (2) in the drill site in mine Di Chou lane (1), take out the gas in coal seam in advance, the coal and gas prominent eliminating superjacent (3) is dangerous;

Second stage: exploitation superjacent (3), during superjacent (3) exploitation, coal seam, middle part (4) and underlying seam (5) are caused and adopt release and stress release, utilize the boring (2) of original drill site, be in the gas adopted in release drainage in coal seam, middle part (4) and underlying seam (5) with the mode extraction of negative pressure;

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

Boring (2) in the drill site in described mine Di Chou lane (1) will be upward through three coal seams; Boring (2) whole process in the drill site in mine Di Chou lane (1) installs steel sleeve (6) protection, will stamp sieve aperture (7) at steel sleeve (6) through the part in coal seam;