CN104632272A - 'Three-soft' low-breathability work surface rib shallow hole gas extraction method - Google Patents
'Three-soft' low-breathability work surface rib shallow hole gas extraction method Download PDFInfo
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- CN104632272A CN104632272A CN201510049998.9A CN201510049998A CN104632272A CN 104632272 A CN104632272 A CN 104632272A CN 201510049998 A CN201510049998 A CN 201510049998A CN 104632272 A CN104632272 A CN 104632272A
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- extraction
- pass
- bye
- gas
- work surface
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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
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/12—Packers; Plugs
-
- 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
Abstract
The invention discloses a 'three-soft' low-breathability work surface rib shallow hole gas extraction method. The 'three-soft' low-breathability work surface rib shallow hole gas extraction method includes the following steps that a hole is perpendicularly drilled in a work surface rib position; the hole is rapidly sealed by at least 1 m after being formed, the drilled hole is connected with an extraction branch pipeline, the extraction branch pipeline is connected with an extraction main pipeline, and valves are installed at the installation positions; the extraction main pipeline is arranged in an return airway and near a recovery rib; an extraction flow monitoring system is installed in the extraction branch pipeline, and the extraction time is determined according to monitored parameters; after extraction, the valve between the extraction branch pipeline and the extraction main pipeline is closed. The 'three-soft' low-breathability work surface rib shallow hole gas extraction method adopts mining disturbance and changes a front coal body original structure, and therefore the breathability of a coal body is increased, and a large amount of gas in adsorption state is changed to be in a free state. At the moment, through work surface rib shallow hole extraction in combination with a rapid hole sealer, gas in a dynamic pressure area in front of a work surface is pre-pumped, and therefore the effect of reducing the gas gushing amount on the work surface is realized.
Description
Technical field
The present invention relates to coal mine gas drainage method, especially for " three is soft " low-permeable working face wall gas pumping method.
Background technology
Gas is a kind of colourless, tasteless gas, and density is at standard conditions 0.716kg/m
3, be 0.554 to the relative density of air, there is combustibility and explosivity, when reaching finite concentration, people can be made to suffocate.And gas exists with free state and adsorbed state in coal body and country rock.Due to the asphyxiating of gas, combustibility and explosive, therefore at mine coal seam recovery process, the problem of gushing out of gas directly threatens the life security of miner and the safety in production of mine, particularly in " three is soft " low permeability coal seam recovery process, the gas distribution in ribbon usually, and gas bearing capacity is larger, how effectively reduces the gas emission in " three is soft " low air permeability coal seam recovery process, to the safety in production of mine, there is important effect.
The main measure of Gas problem in current solution seam mining process is ventilation gas and gas pumping, but ventilation gas has significant limitation, and therefore using maximum is gas pumping technology.But " three is soft " low air permeability coal seam geological structure is many, Coal Seam Thickness Change is large, and gas permeability of coal seam is low, and the easy collapse hole of long drilled holes, therefore conventional extraction difficulty is large, effect is undesirable.
Summary of the invention
The present invention is directed to the feature of " three is soft " low permeability coal seam and the deficiency of existing gas pumping technology, provide one and be applicable to " three is soft " low-permeable working face wall shallow bore hole gas pumping method, interference is adopted in utilization, front coal body primary structure is changed, thus increase the gas permeability of coal body, a large amount of adsorbed state gas changes free state gas into, now by the extraction of working face wall shallow bore hole, coordinate rapid hole packer again, implement to take out in advance to the dynamic pressure area gas in work plane front, thus reach the effect reducing face gas outburst amount.
For achieving the above object, the technical scheme that the present invention takes is:
A kind of " three is soft " low-permeable working face wall shallow bore hole gas pumping method, comprises the steps:
S1, arrange boring at vertical operation face, working face wall place rib, wherein, boring is apart from base plate 1 ~ 1.5m, and face upward 3 ~ 8 °, the spacing of wells is 2 ~ 5m, the long 8 ~ 15m of boring;
Rapid hole sealing at least 1m after S2, pore-forming, will be connected boring with extraction bye-pass fast by tee junction, be connected by extraction bye-pass with extraction main pipe rail, and at the junction mounted valve of extraction bye-pass and extraction main pipe rail;
S3, extraction main pipe rail is arranged in return airway, near back production rib;
S4, in extraction bye-pass, extraction flux monitoring system is installed, and according to the extraction negative pressure monitored, flow and gas density parameter determination extraction time;
After S5, extraction terminate, close the valve between extraction bye-pass and extraction main pipe rail, extraction bye-pass is dismantled, reclaim, realize recycling, now work plane is normally produced, when face advanced distance reaches 3/4ths of extraction hole depth, need reproduction to assign a work face rib shallow bore hole and work plane bye-pass, cycle arrangement technique like this, to the advance of the face to stopping adopting line.
The present invention has following beneficial effect:
The present invention utilizes and adopts interference, front coal body primary structure is changed, thus increase the gas permeability of coal body, a large amount of adsorbed state gas changes free state gas into, now by the extraction of working face wall shallow bore hole, coordinate rapid hole packer again, implement to take out in advance to the dynamic pressure area gas in work plane front, thus reach the effect reducing face gas outburst amount.
Accompanying drawing explanation
Fig. 1 is embodiment of the present invention working face wall shallow bore hole extraction schematic diagram.
In figure, 1-goaf; 2-return airway; 3-air intake lane; 4-holes; 5-extraction bye-pass; 6-extraction main pipe rail.
Detailed description of the invention
In order to make objects and advantages of the present invention clearly understand, below in conjunction with embodiment, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
As shown in Figure 1, embodiments provide one " three is soft " low-permeable working face wall shallow bore hole gas pumping method, comprise the steps:
S1, arrange boring 4 at vertical operation face, working face wall place rib, wherein, boring 4 is apart from base plate 1 ~ 1.5m, and face upward 3 ~ 8 °, the spacing of wells is 2 ~ 5m, the long 8 ~ 15m of boring;
Rapid hole sealing at least 1m after S2, pore-forming, will be connected boring 4 with extraction bye-pass 5 fast by tee junction, be connected by extraction bye-pass 5 with extraction main pipe rail 6, and at the junction mounted valve of extraction bye-pass 5 with extraction main pipe rail 6;
S3, extraction main pipe rail 6 is arranged in return airway 2, near back production rib;
S4, in extraction bye-pass 5, extraction flux monitoring system is installed, and according to the extraction negative pressure monitored, flow and gas density parameter determination extraction time;
After S5, extraction terminate, close the valve between extraction bye-pass 5 and extraction main pipe rail 6, extraction bye-pass 5 is dismantled, reclaim, realize recycling, now work plane is normally produced, when face advanced distance reaches 3/4ths of extraction hole depth, need reproduction to assign a work face rib shallow bore hole and work plane bye-pass 5, cycle arrangement technique like this, to the advance of the face to stopping adopting line.
Wherein, the spacing of wells, the degree of depth and the number of plies can adjust according to Coal Seam Thickness Change.
Embodiment 1
A kind of " three is soft " low-permeable working face wall shallow bore hole gas pumping method, comprises the steps:
S1, arrange boring at vertical operation face, working face wall place rib, wherein, boring is apart from base plate 1m, and face upward 3 °, the spacing of wells is 2m, and hole long 8m;
Rapid hole sealing at least 1m after S2, pore-forming, will be connected boring with extraction bye-pass fast by tee junction, be connected by extraction bye-pass with extraction main pipe rail, and at the junction mounted valve of extraction bye-pass and extraction main pipe rail;
S3, extraction main pipe rail is arranged in return airway, near back production rib;
S4, in extraction bye-pass, extraction flux monitoring system is installed, and according to the extraction negative pressure monitored, flow and gas density parameter determination extraction time;
After S5, extraction terminate, close the valve between extraction bye-pass and extraction main pipe rail, extraction bye-pass is dismantled, reclaim, realize recycling, now work plane is normally produced, when face advanced distance reaches 3/4ths of extraction hole depth, need reproduction to assign a work face rib shallow bore hole and work plane bye-pass, cycle arrangement technique like this, to the advance of the face to stopping adopting line.
Embodiment 2
A kind of " three is soft " low-permeable working face wall shallow bore hole gas pumping method, comprises the steps:
S1, arrange boring at vertical operation face, working face wall place rib, wherein, boring is apart from base plate 1.5m, and face upward 8 °, the spacing of wells is 5m, and hole long 15m;
Rapid hole sealing at least 1m after S2, pore-forming, will be connected boring with extraction bye-pass fast by tee junction, be connected by extraction bye-pass with extraction main pipe rail, and at the junction mounted valve of extraction bye-pass and extraction main pipe rail;
S3, extraction main pipe rail is arranged in return airway, near back production rib;
S4, in extraction bye-pass, extraction flux monitoring system is installed, and according to the extraction negative pressure monitored, flow and gas density parameter determination extraction time;
After S5, extraction terminate, close the valve between extraction bye-pass and extraction main pipe rail, extraction bye-pass 5 is dismantled, reclaim, realize recycling, now work plane is normally produced, when face advanced distance reaches 3/4ths of extraction hole depth, need reproduction to assign a work face rib shallow bore hole and work plane bye-pass, cycle arrangement technique like this, to the advance of the face to stopping adopting line.
Embodiment 3
A kind of " three is soft " low-permeable working face wall shallow bore hole gas pumping method, comprises the steps:
S1, arrange boring at vertical operation face, working face wall place rib, wherein, boring is apart from base plate 1.25m, and face upward 5.5 °, the spacing of wells is 3.5m, and hole long 11.5m;
Rapid hole sealing at least 1m after S2, pore-forming, will be connected boring with extraction bye-pass fast by tee junction, be connected by extraction bye-pass with extraction main pipe rail, and at the junction mounted valve of extraction bye-pass and extraction main pipe rail;
S3, extraction main pipe rail is arranged in return airway, near back production rib;
S4, in extraction bye-pass, extraction flux monitoring system is installed, and according to the extraction negative pressure monitored, flow and gas density parameter determination extraction time;
After S5, extraction terminate, close the valve between extraction bye-pass and extraction main pipe rail, extraction bye-pass is dismantled, reclaim, realize recycling, now work plane is normally produced, when face advanced distance reaches 3/4ths of extraction hole depth, need reproduction to assign a work face rib shallow bore hole and work plane bye-pass, cycle arrangement technique like this, to the advance of the face to stopping adopting line.
In sum, interference is adopted in this concrete enforcement utilization, front coal body primary structure is changed, thus increase the gas permeability of coal body, a large amount of adsorbed state gas changes free state gas into, now by the extraction of working face wall shallow bore hole, then coordinates rapid hole packer, implement to take out in advance to the dynamic pressure area gas in work plane front, thus reach the effect reducing face gas outburst amount
The above is only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (1)
1. " three is soft " low-permeable working face wall shallow bore hole gas pumping method, is characterized in that, comprise the steps:
S1, arrange boring at vertical operation face, working face wall place rib, wherein, boring is apart from base plate 1 ~ 1.5m, and face upward 3 ~ 8 °, the spacing of wells is 2 ~ 5m, the long 8 ~ 15m of boring;
Rapid hole sealing at least 1m after S2, pore-forming, will boring be connected with extraction bye-pass fast by tee junction, extraction bye-pass is connected with extraction main pipe rail, and at the junction mounted valve of extraction bye-pass and extraction main pipe rail;
S3, extraction main pipe rail is arranged in return airway, near back production rib;
S4, in extraction bye-pass, extraction flux monitoring system is installed, and according to the extraction negative pressure monitored, flow and gas density parameter determination extraction time;
After S5, extraction terminate, close the valve between extraction bye-pass 5 and extraction main pipe rail 6, extraction bye-pass is dismantled, reclaim, realize recycling, now work plane is normally produced, when face advanced distance reaches 3/4ths of extraction hole depth, need reproduction to assign a work face rib shallow bore hole and work plane bye-pass, cycle arrangement technique like this, to the advance of the face to stopping adopting line.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105673065A (en) * | 2016-01-12 | 2016-06-15 | 西安科技大学 | Method for pressure relief gas extraction of high-gas outburst coal seam |
| CN105952492A (en) * | 2016-05-26 | 2016-09-21 | 中国矿业大学 | A method for high-gas coal seam working surface drilling and exploitation gas pre-drainage |
| CN107035400A (en) * | 2017-03-27 | 2017-08-11 | 龙口矿业集团有限公司 | Three soft marine site stratum spontaneous fire seam gas exceptions area gas control systems |
| CN107701175A (en) * | 2017-09-04 | 2018-02-16 | 许满贵 | A kind of coal-bed gas pressure measurement apparatus |
| CN111795871A (en) * | 2020-07-14 | 2020-10-20 | 中煤科工集团重庆研究院有限公司 | Automatic coal mine gas sampling device and sampling time setting method |
-
2015
- 2015-01-29 CN CN201510049998.9A patent/CN104632272A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105673065A (en) * | 2016-01-12 | 2016-06-15 | 西安科技大学 | Method for pressure relief gas extraction of high-gas outburst coal seam |
| CN105673065B (en) * | 2016-01-12 | 2017-12-22 | 西安科技大学 | A kind of projecting coal bed pressure relief gas pumping mining method of high methane |
| CN105952492A (en) * | 2016-05-26 | 2016-09-21 | 中国矿业大学 | A method for high-gas coal seam working surface drilling and exploitation gas pre-drainage |
| CN107035400A (en) * | 2017-03-27 | 2017-08-11 | 龙口矿业集团有限公司 | Three soft marine site stratum spontaneous fire seam gas exceptions area gas control systems |
| CN107035400B (en) * | 2017-03-27 | 2020-06-30 | 龙口矿业集团有限公司 | Gas treatment system for abnormal gas region of easily spontaneous combustion coal bed of three-soft sea area stratum |
| CN107701175A (en) * | 2017-09-04 | 2018-02-16 | 许满贵 | A kind of coal-bed gas pressure measurement apparatus |
| CN111795871A (en) * | 2020-07-14 | 2020-10-20 | 中煤科工集团重庆研究院有限公司 | Automatic coal mine gas sampling device and sampling time setting method |
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Application publication date: 20150520 |