CN109944630A - A kind of low-permeable thin seam working surface gas pumping method - Google Patents
A kind of low-permeable thin seam working surface gas pumping method Download PDFInfo
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- CN109944630A CN109944630A CN201910404271.6A CN201910404271A CN109944630A CN 109944630 A CN109944630 A CN 109944630A CN 201910404271 A CN201910404271 A CN 201910404271A CN 109944630 A CN109944630 A CN 109944630A
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Abstract
Low-permeable thin seam working surface gas pumping method proposed by the present invention, back production lane evaluation unit is closed on by the way that working face to be divided into, close on evaluation unit in the middle part of the lane Qie Yan evaluation unit and working face, and different suitable coal bed gas extraction drilling method for arranging is taken for different evaluation unit, finally concordant mash gas pumping drilling is connect with methane gas extraction pipeline, coal-bed gas in each evaluation unit in extraction working face under the action of negative pressure, and drilling is investigated to each evaluation unit construction gas, examine gas pumping effect, the mentioned method of the present invention preferably resolves working face due to balk, poor air permeability, mash gas pumping drilling caused by length is big is easy to be biased to top plate or bottom plate and then leads to gas drainage problem not up to standard, improve coal bed gas extraction compliance rate in the middle part of the effective rate of utilization and working face of mash gas pumping drilling, ensure Working face safety coal extraction.
Description
Technical field
The present invention relates to coal mining technology fields, specially a kind of low-permeable thin seam working surface gas drainage side
Method.
Background technique
Coal and gas prominent is one of the disaster that Safety of Coal Mine Production faces, with coal in China mining rate and depth
The risk of the increase of degree, coal and gas prominent disaster is increasingly severe, causes significant negative impact to coal industry image.
South China coal resources are based on girdle, and gas bearing capacity is high, gas permeability of coal seam is poor, and working face extraction is up to standard
Required time is long, and extraction difficulty is big, is on the other hand work on the one hand the reason is that working face open-off cut Vitrea eye domain is short with respect to the extraction time
Middle face region concordant mash gas pumping drilling construction quality is difficult to ensure.
It is directed to the face gas extraction of low-permeable stoping low coal seam in the past, by two sides back production usually before working face extraction
To working face coal body construction concordant hole pumping and mining gas in the lane Ji Qieyan of tunnel, but the method is difficult to ensure gas in the middle part of working face
Extracting result, especially for low-permeable thin seam working surface, due to gas in coal seam flow difficulties, gas drainage is more
Difficulty, working face central region biggish for length, concordant mash gas pumping drilling, which there is also, is biased to top plate or floor strata
The phenomenon that, it further reduced concordant mash gas pumping drilling extracting result, and then working face central region coal-bed gas is caused to be taken out
It is poor to adopt effect, often causes gas exceeding limit in working face during working face extraction, coal and gas prominent is even induced when serious
Disaster.
Therefore, the big working face coal-bed gas of low for gas permeability, balk, length takes out problem, needs to design more needle
Coal-bed gas pressure is reduced to reduce coal seam gas-bearing capacity to property, gas pumping effect more preferably pumping method, weakens coal seam
Coal and gas prominent risk improves working face extraction safety.
Summary of the invention
To achieve the above object, the invention provides the following technical scheme: a kind of low-permeable thin seam working surface gas is taken out
Mining method, it includes following steps:
Step 1: region is divided；The two sides up and down of working face are back production lane, and the right side of working face is the lane Qie Yan, by work
Face, which is divided into, to be closed on back production lane evaluation unit, closes on the lane Qie Yan evaluation unit and working face middle part evaluation unit, to not
Same region separately carries out gas drainage evaluation；
Step 2: construction concordant mash gas pumping drilling one；First, for back production lane evaluation unit construction concordant gas is closed on
Extraction borehole one is constructed concordant mash gas pumping drilling one perpendicular to the lane side in back production lane into working face；Second, being cut for closing on
Eye lane evaluation unit construct concordant mash gas pumping drilling one, perpendicular to the lane Qie Yan lane side construct into working face concordant gas pumping
Borehole one；
Step 3: construction gas drainage tunnel；For evaluation unit construction gas drainage tunnel in the middle part of working face, working
While the tunnelling in the back production lane of face two sides, tunneled from the tunnel in back production lane to the inside of working face using rectangle light section
Mode tunnel to form gas drainage tunnel, the axis in the gas drainage tunnel is vertical with the axis in the tunnel in back production lane, institute
It states gas drainage tunnel to tunnel along seat earth, meet head on to be located in the middle part of working face in the middle part of the long side of evaluation unit；
Step 4: construction concordant mash gas pumping drilling two；The construction concordant gas on the end face of meeting head in gas drainage tunnel
Extraction borehole two, the concordant mash gas pumping drilling two are arranged in " sector ", along drilling in coal；
Step 5: piping connection；By above-mentioned concordant mash gas pumping drilling one and concordant mash gas pumping drilling two and gas
Extraction piping connection, under the action of negative pressure coal-bed gas in each evaluation unit in extraction working face, negative pressure in methane gas extraction pipeline
Not less than 13KPa, methane gas extraction pipeline is through gas drainage tunnel, the tunnel in back production lane, mining roadway and ground gas extraction system
System connection；
Step 6: construction gas investigates drilling；Gas of constructing in each evaluation unit of working face investigates drilling, to
Whether up to standard investigate gas pressure and gas remainder quantity in each evaluation unit.
Further, in step 1, the width of the working face is L, is closed in the middle part of back production lane evaluation unit and working face
The length of evaluation unit is 150~200m, and wide is L/3, and the length for closing on the lane Qie Yan evaluation unit is L, width 100m.
Further, in step 2, the sealing of hole for closing on the concordant mash gas pumping drilling one in the evaluation unit of back production lane
Length is 10~15m, and aperture is located in the middle part of coal seam, and single arrangement, pitch of holes is 5~10m, is closed in the evaluation unit of back production lane
Concordant mash gas pumping drilling one a length of L/3, a diameter of 90~135mm；Close on the concordant watt in the evaluation unit of the lane Qie Yan
The sealed borehole length 10m of this extraction borehole one, aperture are located in the middle part of coal seam, and single arrangement, pitch of holes is 3~5m, close on and cut eye
A length of 100m of concordant mash gas pumping drilling one in the evaluation unit of lane, a diameter of 90~135mm.
Further, in step 3, the gas drainage tunnel is arranged in " taking a step " formula, and the gas drainage tunnel is broken
Face is rectangle, and the width of the rectangle is 3.5m, and a height of 2m, gas drainage tunnel length is L/3.
Further, in step 4, the concordant mash gas pumping drilling two is arranged in " sector ", and along drilling in coal,
Its sealed borehole length is 10~15m, and aperture uses " three presbyopia " arrangement, and array pitch is 0.5m~1m between tapping point, whole hole
Point linear distance is 5~10m, and the length of the concordant mash gas pumping drilling two, which is subject to, covers evaluation unit, the concordant watt
The diameter of this extraction borehole two is 90~135mm.
Further, in step 6, the gas investigates the parallel drilling in coal that drills, and the gas investigates the sealing of hole of drilling
Length is 10~15m, and position of opening is located in the middle part of the aperture line of adjacent two concordants mash gas pumping drilling one, or is located at phase
In the middle part of the aperture line of adjacent two concordant mash gas pumping drillings two, the borehole bottom location that the gas investigates drilling is located at adjacent two concordant
It is described in the middle part of the whole hole line of mash gas pumping drilling one or in the middle part of the whole hole line of adjacent two concordants mash gas pumping drilling two
Gas investigates 90~135mm of diameter of drilling.
Further, in step 6, it is less than 0.74MPa when investigating gas pressure, and gas remainder quantity is less than 8m3/t
When, show that extraction is up to standard, in evaluation unit otherwise coal seam can show that extraction is not up to standard, coal seam in evaluation unit with safe working
It can not exploit, the extraction time need to be extended until extraction is up to standard.
Compared with prior art, the beneficial effects of the present invention are:
Low-permeable thin seam working surface gas pumping method proposed by the present invention, is closed on back by the way that working face to be divided into
It adopts lane evaluation unit, close on the lane Qie Yan evaluation unit and working face middle part evaluation unit, and taken for different evaluation unit
Concordant mash gas pumping drilling, finally connect by different suitable coal bed gas extraction drilling method for arranging with methane gas extraction pipeline,
Coal-bed gas in each evaluation unit in extraction working face under suction function, and drilling is investigated to each evaluation unit construction gas,
Gas pumping effect is examined, especially for evaluation unit setting construction gas drainage tunnel in the middle part of working face and construction concordant gas
Extraction borehole two, further ensures the gas pumping effect in the middle part of working face in evaluation unit, and the mentioned method of the present invention is preferable
The working face mash gas pumping drilling as caused by balk, poor air permeability, length are big that solves be easy to be biased to top plate or bottom plate
And then lead to gas drainage problem not up to standard, improve coal-bed gas in the middle part of the effective rate of utilization and working face of mash gas pumping drilling
Extraction compliance rate, it is ensured that working face safety coal extraction.
Detailed description of the invention
Fig. 1 is that low-permeable thin seam working surface gas drainage evaluation unit divides plan view；
Fig. 2 is mash gas pumping drilling plane of arrangement figure in coal face evaluation unit；
Fig. 3 is mash gas pumping drilling plane of arrangement figure in gas drainage lane；
Fig. 4 is that end view in section (A-A section in Fig. 3) is met head in gas drainage lane；
In figure: 1, working face；2, back production lane；3, concordant mash gas pumping drilling one；4, the lane Qie Yan；5, gas drainage tunnel；
6, concordant mash gas pumping drilling two；7, gas investigates drilling.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
Fig. 1-4 is please referred to, the present invention provides a kind of technical solution: a kind of low-permeable thin seam working surface gas drainage side
Method, which is characterized in that it includes following steps:
Step 1: region is divided；Such as Fig. 1, the two sides up and down of working face 1 are back production lane 2, and the right side of working face 1 is to cut eye
Lane 4, working face 1 is divided into close on back production lane evaluation unit (C, D, F, G, I, J), close on the lane Qie Yan evaluation unit (A) and
Evaluation unit (B, E, H) in the middle part of working face, separately to carry out gas drainage evaluation to different regions；
Step 2: construction concordant mash gas pumping drilling 1；First, for back production lane evaluation unit construction concordant watt is closed on
This extraction borehole 1 is constructed concordant mash gas pumping drilling 1 perpendicular to the lane side in back production lane 2 into working face 1；Second, being directed to
The lane Qie Yan evaluation unit construction concordant mash gas pumping drilling 1 is closed on, is constructed perpendicular to the lane side in the lane Qie Yan 4 into working face 1
Concordant mash gas pumping drilling 1；
Step 3: construction gas drainage tunnel 5；For evaluation unit construction gas drainage tunnel 5 in the middle part of working face, in work
It is small disconnected using rectangle from the tunnel in back production lane 2 to the inside of working face 1 while making the tunnelling in the back production lane 2 of 1 two sides of face
The mode of face driving tunnels to form gas drainage tunnel 5, the axis in the tunnel of the axis and back production lane 2 in the gas drainage tunnel 5
Line is vertical, and the gas drainage tunnel 5 is tunneled along seat earth, meets head on to be located in the middle part of working face in the long side of evaluation unit
Portion；
Step 4: construction concordant mash gas pumping drilling 26；The construction concordant watt on the end face of meeting head in gas drainage tunnel 5
This extraction borehole 26, the concordant mash gas pumping drilling 26 are arranged in " sector ", along drilling in coal；
Step 5: piping connection；By above-mentioned concordant mash gas pumping drilling 1 and concordant mash gas pumping drilling 26 with watt
This extraction piping connection, under the action of negative pressure coal-bed gas in each evaluation unit in extraction working face 1 are born in methane gas extraction pipeline
Pressure is not less than 13KPa, and methane gas extraction pipeline is taken out through gas drainage tunnel 5, the tunnel in back production lane 2, mining roadway and ground gas
Extraction system connection；
Step 6: construction gas investigates drilling 7；Gas of constructing in each evaluation unit of working face 1 investigates drilling 7,
It is whether up to standard to investigate gas pressure and gas remainder quantity in each evaluation unit.
Specifically, the width of the working face 1 is L in step 1, closes in the middle part of back production lane evaluation unit and working face and comment
The length of valence unit is 200m, and wide is L/3, and the length for closing on the lane Qie Yan evaluation unit is L, width 100m.
Specifically, the sealing of hole for closing on the concordant mash gas pumping drilling 1 in the evaluation unit of back production lane is long in step 2
Degree is 15m, and aperture is located in the middle part of coal seam, and single arrangement, pitch of holes 10m closes on the concordant watt in the evaluation unit of back production lane
A length of L/3 of this extraction borehole 1, a diameter of 135mm；Close on the concordant mash gas pumping drilling one in the evaluation unit of the lane Qie Yan
3 sealed borehole length 10m, aperture are located in the middle part of coal seam, and single arrangement, pitch of holes 5m closes in the evaluation unit of the lane Qie Yan
A length of 100m of concordant mash gas pumping drilling 1, a diameter of 135mm.
Specifically, the gas drainage tunnel 5 is arranged in " taking a step " formula in step 3, the gas drainage tunnel 5 is broken
Face is rectangle, and the width of the rectangle is 3.5m, a height of 2m, and 5 length of gas drainage tunnel is L/3, two neighboring gas drainage
The axis in tunnel 5 is at a distance of 400m.
Specifically, such as Fig. 2 and 3, the concordant mash gas pumping drilling 26 is arranged in " sector ", and along coal in step 4
Layer drilling, sealed borehole length 15m, such as Fig. 4, aperture is using three presbyopia of mouth " arrangement, array pitch is between tapping point
0.5m, whole hole point linear distance is 10m, and the length of the concordant mash gas pumping drilling 26, which is subject to, covers evaluation unit, institute
The diameter for stating concordant mash gas pumping drilling 26 is 135mm.
Specifically, the gas investigates 7 parallel drilling in coal of drilling in step 6, the gas investigates the sealing of hole of drilling 7
Length is 10~15m, and position of opening is located in the middle part of the aperture line of adjacent two concordants mash gas pumping drilling 1, or is located at
In the middle part of the aperture line of adjacent two concordants mash gas pumping drilling 26, the borehole bottom location that the gas investigates drilling 7 is located at adjacent two
In the middle part of the whole hole line of concordant mash gas pumping drilling 1 or in the whole hole line of adjacent two concordants mash gas pumping drilling 26
Portion, the gas investigate 90~135mm of diameter of drilling 7.
Specifically, being less than 0.74MPa when investigating gas pressure, and gas remainder quantity is less than 8m3When/t, show that extraction reaches
It marks, in evaluation unit otherwise coal seam can show that extraction is not up to standard with safe working, and coal seam can not exploit in evaluation unit, need to prolong
The long extraction time is until extraction is up to standard.
Low-permeable thin seam working surface gas pumping method proposed by the present invention, is closed on back by the way that working face to be divided into
It adopts lane evaluation unit, close on the lane Qie Yan evaluation unit and working face middle part evaluation unit, and taken for different evaluation unit
Concordant mash gas pumping drilling, finally connect by different suitable coal bed gas extraction drilling method for arranging with methane gas extraction pipeline,
Coal-bed gas in each evaluation unit in extraction working face under suction function, and drilling is investigated to each evaluation unit construction gas,
Gas pumping effect is examined, especially for evaluation unit setting construction gas drainage tunnel in the middle part of working face and construction concordant gas
Extraction borehole two, further ensures the gas pumping effect in the middle part of working face in evaluation unit, and the mentioned method of the present invention is preferable
The working face mash gas pumping drilling as caused by balk, poor air permeability, length are big that solves be easy to be biased to top plate or bottom plate
And then lead to gas drainage problem not up to standard, improve coal-bed gas in the middle part of the effective rate of utilization and working face of mash gas pumping drilling
Extraction compliance rate, it is ensured that working face safety coal extraction.
It although an embodiment of the present invention has been shown and described, for the ordinary skill in the art, can be with
A variety of variations, modification, replacement can be carried out to these embodiments without departing from the principles and spirit of the present invention by understanding
And modification, the scope of the present invention is defined by the appended.
Claims (7)
1. a kind of low-permeable thin seam working surface gas pumping method, which is characterized in that it includes following steps:
Step 1: region is divided；The two sides up and down of working face (1) are back production lane (2), and the right side of working face (1) is the lane Qie Yan
(4), working face (1) is divided into and closes on back production lane evaluation unit, closes on the lane Qie Yan evaluation unit and the evaluation of working face middle part
Unit, separately to carry out gas drainage evaluation to different regions；
Step 2: construction concordant mash gas pumping drilling one (3)；First, for back production lane (2) evaluation unit construction concordant watt is closed on
This extraction borehole one (3) constructs concordant mash gas pumping drilling one (3) into working face (1) perpendicular to the lane side of back production lane (2)；
Second, for the lane Qie Yan (4) evaluation unit construction concordant mash gas pumping drilling one (3) is closed on, perpendicular to the lane side of the lane Qie Yan (4)
Concordant mash gas pumping drilling one (3) are constructed into working face (1)；
Step 3: construction gas drainage tunnel (5)；For evaluation unit construction gas drainage tunnel (5) in the middle part of working face, in work
While making the tunnelling in the back production lane (2) of face (1) two sides, used from the tunnel of back production lane (2) to the inside of working face (1)
The mode of rectangle light section driving tunnels to be formed gas drainage tunnel (5), the axis of the gas drainage tunnel (5) and back production lane
(2) axis in tunnel is vertical, and the gas drainage tunnel (5) is tunneled along seat earth, meets head on to be located in the middle part of working face and comment
In the middle part of the long side of valence unit；
Step 4: construction concordant mash gas pumping drilling two (6)；The construction concordant watt on the end face of meeting head on of gas drainage tunnel (5)
This extraction borehole two (6), the concordant mash gas pumping drilling two (6) are arranged in " sector ", along drilling in coal；
Step 5: piping connection；By above-mentioned concordant mash gas pumping drilling one (3) and concordant mash gas pumping drilling two (6) with watt
This extraction piping connection, coal-bed gas in each evaluation unit in extraction working face (1) under the action of negative pressure, in methane gas extraction pipeline
Negative pressure is not less than 13KPa, tunnel, mining roadway and ground of the methane gas extraction pipeline through gas drainage tunnel (5), back production lane (2)
Gas drainage system connection；
Step 6: construction gas investigates drilling (7)；Construction gas investigates drilling in each evaluation unit of working face (1)
(7), whether up to standard to investigate gas pressure and gas remainder quantity in each evaluation unit.
2. a kind of low-permeable thin seam working surface gas pumping method according to claim 1, which is characterized in that step
In one, the width of the working face (1) is L, and the length for closing on evaluation unit in the middle part of back production lane evaluation unit and working face is 150
~200m, wide is L/3, and the length for closing on the lane Qie Yan evaluation unit is L, width 100m.
3. a kind of low-permeable thin seam working surface gas pumping method according to claim 1, which is characterized in that step
In two, the sealed borehole length for closing on the concordant mash gas pumping drilling one (3) in back production lane (2) evaluation unit is 10~15m,
Aperture is located in the middle part of coal seam, single arrangement, and pitch of holes is 5~10m, and the concordant gas drainage closed in the evaluation unit of back production lane is bored
A length of L/3 in hole one (3), a diameter of 90~135mm；Close on the concordant mash gas pumping drilling one in the evaluation unit of the lane Qie Yan
(3) sealed borehole length 10m, aperture are located in the middle part of coal seam, and single arrangement, pitch of holes is 3~5m, close on the lane Qie Yan evaluation unit
In concordant mash gas pumping drilling one (3) a length of 100m, a diameter of 90~135mm.
4. a kind of low-permeable thin seam working surface gas pumping method according to claim 1, which is characterized in that step
In three, the gas drainage tunnel (5) is arranged in " taking a step " formula, and the section of the gas drainage tunnel (5) is rectangle, the rectangle
Width be 3.5m, a height of 2m, gas drainage tunnel (5) length be L/3.
5. a kind of low-permeable thin seam working surface gas pumping method according to claim 1, which is characterized in that step
In four, the concordant mash gas pumping drilling two (6) is arranged in " sector ", and along drilling in coal, sealed borehole length is 10~
15m, aperture use " three presbyopia " arrangement, and array pitch is 0.5m~1m between tapping point, and whole hole point linear distance is 5~
10m, the length of the concordant mash gas pumping drilling two (6), which is subject to, covers evaluation unit, the concordant mash gas pumping drilling two
(6) diameter is 90~135mm.
6. a kind of low-permeable thin seam working surface gas pumping method according to claim 1, which is characterized in that step
In six, the gas investigates the parallel drilling in coal of drilling (7), and the sealed borehole length that the gas investigates drilling (7) is 10~15m,
Its position of opening is located in the middle part of the aperture line of adjacent two concordants mash gas pumping drilling one (3), or is located at adjacent two concordant watt
In the middle part of the aperture line of this extraction borehole two (6), the borehole bottom location that the gas investigates drilling (7) is located at adjacent two concordants gas
In the middle part of the whole hole line of extraction borehole one (3) or in the middle part of the whole hole line of adjacent two concordants mash gas pumping drilling two (6), institute
State 90~135mm of diameter that gas investigates drilling (7).
7. a kind of low-permeable thin seam working surface gas pumping method according to claim 1, which is characterized in that described
In step 6, it is less than 0.74MPa when investigating gas pressure, and gas remainder quantity is less than 8m3When/t, shows that extraction is up to standard, comment
In valence unit otherwise coal seam can show that extraction is not up to standard with safe working, and coal seam can not exploit in evaluation unit, need to extend extraction
Time is until extraction is up to standard.
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| CN109944630B (en) | 2020-08-25 |
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