CN105673065B - A kind of projecting coal bed pressure relief gas pumping mining method of high methane - Google Patents
A kind of projecting coal bed pressure relief gas pumping mining method of high methane Download PDFInfo
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- CN105673065B CN105673065B CN201610039053.3A CN201610039053A CN105673065B CN 105673065 B CN105673065 B CN 105673065B CN 201610039053 A CN201610039053 A CN 201610039053A CN 105673065 B CN105673065 B CN 105673065B
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F7/00—Methods or devices for drawing- off gases with or without subsequent use of the gas for any purpose
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
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- Life Sciences & Earth Sciences (AREA)
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- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
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Abstract
The invention discloses a kind of projecting coal bed pressure relief gas pumping mining method of high methane, comprise the following steps：At least one stone head is laid above the corresponding water-bearing stratum of high gassy and low permeability coal seam, and soil pressure cell and pore pressure gauge are installed in stone head surrounding；Constructed multiple drillings to water-bearing stratum from stone head, rapid hole sealing after pore-forming, and extraction branch pipe, the connection of extraction main pipe rail and valve are installed；Water in water-bearing stratum is replaced to clean, passage of the gas to the movement of drilling in formation high gas layer using air；So that gas is connected to the passage of the movement of drilling with drilling forms L-type gas channel；Comprehensive multiple parameters determine the extraction time, start to carry out pressure relief gas pumping mining to the high gas layer of bottom.Water in water-bearing stratum is replaced the clean rear space formed by the present invention using air, so as to increase the gas permeability of coal body, can largely be reduced borehole engineering amount, be significantly improved coal bed gas extraction effect, have wide applicability.
Description
Technical field
The present invention relates to gas pumping method, and in particular to a kind of projecting coal bed pressure relief gas pumping mining method of high methane.
Background technology
Roof position all preservations of many highly gassy mines in China have water-bearing layer.To prevent the generation of water inrush accident,
Need to discharge water drilling to water-bearing layer construction before seam mining, then discharge water again.Find in practice by being put to water-bearing stratum
Water, working face flood is not only eliminated, and the gas permeability in coal seam also significantly increases, and gas can be given off from drilling, this
Illustrate to form the crack passage that coal-bed gas pours in the drilling that discharges water in rock stratum.
Through analysis, after being discharged water to roof water-bearing layer, the gas permeability in coal seam increases, and coal-bed gas is led with drilling
Logical, its mechanism is similar with protective coat extracted.After protective coat extracted, due to strata movement, stress reduces, cranny development causes quilt
Protective layer obtains release antireflective effect, and conducting crack is formed in interlayer rock stratum.Similarly, water-bearing stratum just looks like protective layer, is contained
The process that water rock stratum discharges water is equivalent to the process that up-protective layer is exploited.Water preservation occupies certain space in rock stratum, after discharging water
The space reserved in rock stratum, space is provided for the movement of bottom coal rock layer, deformation.Some water-bearing layers are very thick, can be thick up to number
Ten meters.Therefore the useful space that water-bearing layer leaves after discharging water may be such that bottom coal rock layer obtains sufficient movement and deformation, stress drop
The increase of low and gas permeability, foundation is provided for extraction coal seam pressure relief gas..
The content of the invention
The deficiencies in the prior art of the present invention, there is provided a kind of projecting coal bed pressure relief gas pumping mining method of high methane, add
The gas permeability of coal body, shorten the gas pumping time, a large amount of borehole engineering amounts can be saved, reduce the gas emission of working face.
To achieve the above object, the technical scheme taken of the present invention is：
A kind of projecting coal bed pressure relief gas pumping mining method of high methane, comprises the following steps：
S1, lay at least one stone head above the corresponding water-bearing stratum of high gassy and low permeability coal seam, and
Stone head surrounding installs soil pressure cell and pore pressure gauge；
S2, constructed multiple drillings to water-bearing stratum from stone head, rapid hole sealing after pore-forming, and pass through three-way connection will
Quickly drilling is connected with extraction bye-pass, extraction bye-pass is connected with extraction main pipe rail, and total in extraction bye-pass and extraction
The junction installation valve of pipeline；
S3, using air the water in water-bearing stratum replaced it is clean so that neighbouring coal rock layer produces movement and deformation, and increase contains
The gas permeability of water rock stratum bottom high gas layer, while neighbouring coal rock layer is produced new crack, and formed in high gas layer
Passage of the gas to the movement of drilling；
S4, cause gas is connected to the passage of the movement of drilling with drilling to form L-type gas channel；
S5, extraction main pipe rail is arranged in return airway, close to back production rib, and extraction stream is installed in extraction bye-pass
Monitoring system is measured, the extraction time is determined according to the pressure value, extraction negative pressure, flow, the gas density parameter that monitor around tunnel,
Start to carry out pressure relief gas pumping mining to the high gas layer of bottom.
Wherein, for bore angle to face upward 3~8 °, the spacing of wells is 3~7m, and drilling length determines according to field condition.
The invention has the advantages that：
The water in water-bearing stratum is replaced into the clean rear space formed using air, can so as to increase the gas permeability of coal body
So that the coal rock layer of bottom is moved, deformation, gas permeability increase, coal seam pressure relief, produce new crack, and form coal-bed gas
To the migration pathway of drilling, the present invention can largely reduce borehole engineering amount, significantly improve coal bed gas extraction effect, have extensive
Practicality, and reduce the effect of face gas outburst amount, while the determination of recovery time has been considered around tunnel
Pressure value, extraction negative pressure, flow and gas density parameter, improve the security of construction.
Embodiment
In order that objects and advantages of the present invention are more clearly understood, the present invention is carried out with reference to embodiments further
Describe in detail.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, it is not used to limit this hair
It is bright.
Embodiment 1
S1, lay at least one stone head above the corresponding water-bearing stratum of high gassy and low permeability coal seam, and
Stone head surrounding installs soil pressure cell and pore pressure gauge；
S2, constructed multiple drillings to water-bearing stratum from stone head, bore angle to face upward 3 °, spacing of wells 3m,
Drilling length determines according to field condition；Rapid hole sealing after pore-forming, and will be quickly by drilling and extraction bye-pass by three-way connection
Connection, extraction bye-pass are connected with extraction main pipe rail, and install valve in the junction of extraction bye-pass and extraction main pipe rail；
S3, using air the water in water-bearing stratum replaced it is clean so that neighbouring coal rock layer produces movement and deformation, and increase contains
The gas permeability of water rock stratum bottom high gas layer, while neighbouring coal rock layer is produced new crack, and formed in high gas layer
Passage of the gas to the movement of drilling；
S4, cause gas is connected to the passage of the movement of drilling with drilling to form L-type gas channel；
S5, extraction main pipe rail is arranged in return airway, close to back production rib, and extraction stream is installed in extraction bye-pass
Monitoring system is measured, the extraction time is determined according to the pressure value, extraction negative pressure, flow, the gas density parameter that monitor around tunnel,
Start to carry out pressure relief gas pumping mining to the high gas layer of bottom.
Embodiment 2
S1, lay at least one stone head above the corresponding water-bearing stratum of high gassy and low permeability coal seam, and
Stone head surrounding installs soil pressure cell and pore pressure gauge；
S2, constructed multiple drillings to water-bearing stratum from stone head, bore angle to face upward 8 °, spacing of wells 7m,
Drilling length determines according to field condition；Rapid hole sealing after pore-forming, and will be quickly by drilling and extraction bye-pass by three-way connection
Connection, extraction bye-pass are connected with extraction main pipe rail, and install valve in the junction of extraction bye-pass and extraction main pipe rail；
S3, using air the water in water-bearing stratum replaced it is clean so that neighbouring coal rock layer produces movement and deformation, and increase contains
The gas permeability of water rock stratum bottom high gas layer, while neighbouring coal rock layer is produced new crack, and formed in high gas layer
Passage of the gas to the movement of drilling；
S4, cause gas is connected to the passage of the movement of drilling with drilling to form L-type gas channel；
S5, extraction main pipe rail is arranged in return airway, close to back production rib, and extraction stream is installed in extraction bye-pass
Monitoring system is measured, the extraction time is determined according to the pressure value, extraction negative pressure, flow, the gas density parameter that monitor around tunnel,
Start to carry out pressure relief gas pumping mining to the high gas layer of bottom.
Embodiment 3
S1, lay at least one stone head above the corresponding water-bearing stratum of high gassy and low permeability coal seam, and
Stone head surrounding installs soil pressure cell and pore pressure gauge；
S2, constructed multiple drillings to water-bearing stratum from stone head, to face upward 5.5 °, the spacing of wells is bore angle
5m, drilling length determine according to field condition；Rapid hole sealing after pore-forming, and will be quickly by drilling and extraction branch pipe by three-way connection
Road is connected, and extraction bye-pass is connected with extraction main pipe rail, and installs valve in the junction of extraction bye-pass and extraction main pipe rail；
S3, using air the water in water-bearing stratum replaced it is clean so that neighbouring coal rock layer produces movement and deformation, and increase contains
The gas permeability of water rock stratum bottom high gas layer, while neighbouring coal rock layer is produced new crack, and formed in high gas layer
Passage of the gas to the movement of drilling；
S4, cause gas is connected to the passage of the movement of drilling with drilling to form L-type gas channel；
S5, extraction main pipe rail is arranged in return airway, close to back production rib, and extraction stream is installed in extraction bye-pass
Monitoring system is measured, the extraction time is determined according to the pressure value, extraction negative pressure, flow, the gas density parameter that monitor around tunnel,
Start to carry out pressure relief gas pumping mining to the high gas layer of bottom.
Described above is only the preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, under the premise without departing from the principles of the invention, some improvements and modifications can also be made, these improvements and modifications also should
It is considered as protection scope of the present invention.
Claims (2)
1. a kind of projecting coal bed pressure relief gas pumping mining method of high methane, it is characterised in that comprise the following steps：
S1, at least one stone head is laid above the corresponding water-bearing stratum of high gassy and low permeability coal seam, and in rock
Tunnel surrounding installation soil pressure cell and pore pressure gauge；
S2, constructed multiple drillings to water-bearing stratum from stone head, rapid hole sealing after pore-forming, and will be quick by three-way connection
Drilling is connected with extraction bye-pass, extraction bye-pass is connected with extraction main pipe rail, and in extraction bye-pass and extraction main pipe rail
Junction installation valve；
S3, using air the water in water-bearing stratum replaced it is clean so that neighbouring coal rock layer produces movement and deformation, increases water-bearing rock
The gas permeability of layer bottom high gas layer, while neighbouring coal rock layer is produced new crack, and form gas in high gas layer
To the passage of the movement of drilling；
S4, cause gas is connected to the passage of the movement of drilling with drilling to form L-type gas channel；
S5, extraction main pipe rail is arranged in return airway, close to back production rib, and extraction flow prison is installed in extraction bye-pass
Control system, the extraction time is determined according to the pressure value, extraction negative pressure, flow, the gas density parameter that monitor around tunnel, started
Pressure relief gas pumping mining is carried out to the high gas layer of bottom.
A kind of 2. projecting coal bed pressure relief gas pumping mining method of high methane according to claim 1, it is characterised in that drilling angle
Spend to face upward 3~8 °, the spacing of wells is 3~7m, and drilling length determines according to field condition.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610039053.3A CN105673065B (en) | 2016-01-12 | 2016-01-12 | A kind of projecting coal bed pressure relief gas pumping mining method of high methane |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610039053.3A CN105673065B (en) | 2016-01-12 | 2016-01-12 | A kind of projecting coal bed pressure relief gas pumping mining method of high methane |
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| CN105673065A CN105673065A (en) | 2016-06-15 |
| CN105673065B true CN105673065B (en) | 2017-12-22 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103362540A (en) * | 2013-08-07 | 2013-10-23 | 中国矿业大学 | High gas coal seam pressure relief gas extraction method |
| CN103362541A (en) * | 2013-08-07 | 2013-10-23 | 中国矿业大学 | Method for locally improving coal seam air permeability in coal seam with high gas and low air permeability |
| CN104612644A (en) * | 2014-11-18 | 2015-05-13 | 山西潞安矿业(集团)有限责任公司 | Gas phase fracturing and fast gas extraction method for low permeability coal bed |
| CN104632272A (en) * | 2015-01-29 | 2015-05-20 | 西安科技大学 | 'Three-soft' low-breathability work surface rib shallow hole gas extraction method |
| CN104863555A (en) * | 2015-05-18 | 2015-08-26 | 太原理工大学 | Method for improving downhole heating coal seam gas extraction amount |
-
2016
- 2016-01-12 CN CN201610039053.3A patent/CN105673065B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103362540A (en) * | 2013-08-07 | 2013-10-23 | 中国矿业大学 | High gas coal seam pressure relief gas extraction method |
| CN103362541A (en) * | 2013-08-07 | 2013-10-23 | 中国矿业大学 | Method for locally improving coal seam air permeability in coal seam with high gas and low air permeability |
| CN104612644A (en) * | 2014-11-18 | 2015-05-13 | 山西潞安矿业(集团)有限责任公司 | Gas phase fracturing and fast gas extraction method for low permeability coal bed |
| CN104632272A (en) * | 2015-01-29 | 2015-05-20 | 西安科技大学 | 'Three-soft' low-breathability work surface rib shallow hole gas extraction method |
| CN104863555A (en) * | 2015-05-18 | 2015-08-26 | 太原理工大学 | Method for improving downhole heating coal seam gas extraction amount |
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| CN105673065A (en) | 2016-06-15 |
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