CN107956467A - A kind of high seam pre-draining borehole parameter optimization and the method for extracting result assessment - Google Patents
A kind of high seam pre-draining borehole parameter optimization and the method for extracting result assessment Download PDFInfo
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- CN107956467A CN107956467A CN201711154679.XA CN201711154679A CN107956467A CN 107956467 A CN107956467 A CN 107956467A CN 201711154679 A CN201711154679 A CN 201711154679A CN 107956467 A CN107956467 A CN 107956467A
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- 238000005457 optimization Methods 0.000 title claims abstract description 23
- 238000000034 method Methods 0.000 title claims abstract description 20
- 238000000605 extraction Methods 0.000 claims abstract description 64
- 239000003245 coal Substances 0.000 claims abstract description 42
- 238000005086 pumping Methods 0.000 claims abstract description 26
- 239000004744 fabric Substances 0.000 claims abstract description 16
- 230000000694 effects Effects 0.000 claims abstract description 14
- 238000011156 evaluation Methods 0.000 claims abstract description 9
- 230000004069 differentiation Effects 0.000 claims abstract description 8
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 18
- 238000005553 drilling Methods 0.000 claims description 13
- 230000000087 stabilizing effect Effects 0.000 claims description 10
- 239000003034 coal gas Substances 0.000 claims description 7
- 230000008859 change Effects 0.000 claims description 6
- 238000005065 mining Methods 0.000 claims description 4
- 238000004519 manufacturing process Methods 0.000 abstract description 9
- 238000010586 diagram Methods 0.000 description 5
- 241001074085 Scophthalmus aquosus Species 0.000 description 4
- 238000010276 construction Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 230000035699 permeability Effects 0.000 description 3
- 238000005520 cutting process Methods 0.000 description 2
- 239000004047 hole gas Substances 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000003795 desorption Methods 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 230000007115 recruitment Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
- E21B49/003—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells by analysing drilling variables or conditions
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- Analytical Chemistry (AREA)
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
The invention discloses a kind of method that high seam pre-draining borehole parameter optimization and extracting result are assessed, this method is remained unchanged mainly for concordant pre-draining borehole negative pressure in front of stope face to face, cloth hole orientation is unreasonable, cloth hole number is unsatisfactory for the problems such as high seam extraction needs, it is proposed the differentiation control for including concordant pre-draining borehole extraction negative pressure in front of stope, concordant pre-draining borehole cloth hole orientation angles optimize, two rows of concordant pre-draining boreholes are arranged along coal seam short transverse, the high seam pre-draining borehole parameter optimizations such as concordant pre-draining borehole gas pumping effect dynamic evaluation and the method for extracting result assessment, this method can improve high seam pre-draining borehole extracting result, ensure the safety in production of stope.
Description
Technical field
The invention belongs to the technical fields such as mine gas prevention and control, and in particular to high seam pre-draining borehole parameter optimization and extraction
The method of recruitment evaluation.
Background technology
Concordant Gas pre-drainage have single hole pore-forming expense is low, drilling using advantages such as time long, drilling utilization ratio height, be
A kind of important means that mine gas is administered at present, but on the whole, the concordant Gas pre-drainage extraction amount of the most of mines in China
Smaller, extraction is inefficient, and main cause has two aspects：First, natural cause, the high methane and protrusion in China more than 95%
The coal seam that mine is exploited belongs to low air permeability coal seam, and gas drainage under suction (particularly pre- to take out) difficulty is very big；Second, technology and pipe
Reason factor, is mainly shown as that the extraction time is short, borehole engineering amount deficiency, sealing quality difference etc..In addition, mine concordant at present
Gas pre-drainage there is a problem in that：(1) all aperture negative pressure of concordant pre-draining borehole remain unchanged, and reduce concordant pre-draining borehole
Extraction efficiency；On the one hand the extraction efficiency of single concordant pre-draining borehole is reduced；Since there are release in front of stope
Area, anallobar and voltage stabilizing area；The desorption of distressed zone coal gas is easier to, and relatively low extraction negative pressure can meet extraction requirement, and
When extraction pressure is higher, since sealing of hole is relatively difficult, extraction air leakage is big, causes extracting result bad；Anallobar coal body solution
Gas more difficulty is inhaled, it is necessary to which the extraction negative pressure of bigger can just be met the requirements；The drilling in voltage stabilizing area keeps aperture under normal conditions
Negative pressure is constant, but can occur collapse hole, practice of construction perforate azimuth angle error, drill bit during the drilling construction of part because coal body is soft
Developed and turned on due to coalmass crevasse behind unilateral centrifugal action off-design track and construction, many factors such as Geological Structure Effect
Cause drilling that collapse hole occurs, alters phenomena such as hole, it is also desirable to which adjustment extraction negative pressure in time, ensures preferable single hole gas pumping effect
Fruit.Still further aspect, constrains the extracting result of whole stope, when stope gas pumping rate is not reaching to
《Coal mine gas drainage temporary provisions up to standard》It is required that when, in requisition for the negative pressure of timely adjustment stope collecting pipe, improve back
Mining face gas pumping efficiency.(2) most pre- vertical coal wall directions of concordant drilling of taking out are arranged, have impact on pre- pumping effect；By
There is anisotropic character in coal body permeability, when concordant drill arrangement azimuth it is different when, gas pumping effect have compared with
Big difference；In addition, when concordant pre-draining borehole towards working face open-off cut eye direction with having certain angle, single pre- take out can be extended and bored
The extraction time in hole.(3) most pre- pumping concordant drillings only arrange a row hole drilling along vertical coal seam short transverse, influence coal-bed gas
It is pre- to take out effect, especially for high seam, since pre-draining borehole extraction coverage is limited, particularly along vertical coal seam height side
Small to permeability, single pre-draining borehole often can not effective extraction superjacent gas.In view of the above-mentioned problems, targetedly
Optimize concordant pre-draining borehole parameter, to increase concordant drilling single hole gas pumping efficiency, improve the watt pre- of whole stope
Effect is taken out, can be to prevent mine gas disaster from providing relatively reliable safety guarantee, to promoting mine safety, efficiently production has
Significance.
The content of the invention
In view of the problems of the existing technology, the present invention provides a kind of high seam pre-draining borehole parameter optimization and extracting result
The method of assessment, this method is remained unchanged mainly for concordant pre-draining borehole negative pressure in front of stope face to face, cloth hole orientation
Unreasonable, cloth hole number is unsatisfactory for the problems such as high seam extraction needs, and situation is assessed with reference to extracting result, proposes that concordant takes out brill in advance
Hole parameter optimization scheme, so as to improve high seam pre-draining borehole extracting result, ensures the safety in production of stope.
In order to solve the above technical problems, the present invention adopts the following technical scheme that：A kind of high seam concordant pre-draining borehole parameter
Optimization and the method for extracting result assessment, including the differentiation of concordant pre-draining borehole extraction negative pressure controls in front of stope,
Concordant pre-draining borehole cloth hole orientation angles optimize, and two rows of concordant pre-draining boreholes, concordant pre-draining borehole are arranged along coal seam short transverse
Gas pumping effect dynamic evaluation.
The differentiation control of concordant pre-draining borehole extraction negative pressure in front of the stope, in stope return air
Valve is respectively provided with crossheading and haulage gate confluence manifold and each extraction borehole branch pipe, changes valve openings size, realizes suitable
The dynamic adjustment of layer pre-draining borehole extraction negative pressure.
The concordant pre-draining borehole cloth hole orientation angles optimization, the main factor for considering two aspects, first as far as possible
Ensure that concordant pre-draining borehole cloth hole direction is vertical with coal seam biggest principal stress direction, secondly consider concordant pre-draining borehole and towards back production
There is certain angle in working face open-off cut eye direction, and angle is optimal at 15 °~25 °.
Described arranges two rows of concordant pre-draining boreholes along coal seam short transverse, and first row concordant pre-draining borehole is arranged in 1/3
Coal seam is highly located, and second row concordant pre-draining borehole is arranged in 2/3 coal seam and highly locates；First row concordant pre-draining borehole is used under extraction
Portion's coal gas, second row concordant pre-draining borehole are used for extraction top coal gas.
The concordant pre-draining borehole gas pumping effect dynamic evaluation, it is more by installing gas drainage under suction on extraction pipeline
Parameter determinator, monitors gas extraction flow and extraction concentration, a period of time internal drilling gas pumping scale is counted, with reference to coal seam
Original gas bearing capacity, predicts the coal seam residual gas content after extraction；With reference to the wind resource assessment amount of stope, back production is predicted
The gas pumping rate of working face；According to the coal seam residual gas content after the concordant pre-draining borehole extraction of prediction, watt of working face
This extraction rate, evaluates concordant pre-draining borehole extracting result, proposes stope confluence manifold Valve controlling schemes.
The change valve openings size, reduces and is opened positioned at distressed zone concordant pre-draining borehole valve in front of stope
Mouthful, valve openings of the increase positioned at the extraction borehole of anallobar in front of stope.
The change valve openings size, the concordant pre-draining borehole valve openings positioned at voltage stabilizing area in front of stope
Size, is adjusted according to single concordant pre-draining borehole methane gas concentration, when single concordant pre-draining borehole methane gas concentration
During significantly lower than periphery voltage stabilizing area concordant pre-draining borehole methane gas concentration, reduce the concordant pre-draining borehole valve openings.
The stope confluence manifold Valve controlling schemes, coal seam residual gas content or back production after extraction
The gas pumping rate of working face is not up to《Coal mine gas drainage temporary provisions up to standard》It is required that when, increase stope collecting pipe
Valve openings, or reduce adjacent stope collecting pipe valve openings, realize and improve stope collecting pipe extraction negative pressure.
Beneficial effects of the present invention：
High seam pre-draining borehole parameter optimization provided by the invention and the method for extracting result assessment, including stope
The differentiation control of front concordant pre-draining borehole extraction negative pressure, concordant pre-draining borehole cloth hole orientation angles optimization, along coal seam height
The two rows of concordant pre-draining boreholes of direction arrangement, concordant pre-draining borehole gas pumping effect dynamic evaluation, comprehensive to optimize concordant pre-
Draining borehole parameter, improves high seam pre-draining borehole extracting result, ensure that the safety in production of stope.
Brief description of the drawings
Fig. 1 is overall schematic of the present invention (top view)
Fig. 2 is pre-draining borehole arrangement schematic diagram (top view)
Fig. 3 is valve and multi parameter tester arrangement schematic diagram
Fig. 4 is pre-draining borehole arrangement schematic diagram 1 (front view)
Fig. 5 is pre-draining borehole arrangement schematic diagram 2 (front view)
Fig. 6 is valve and multi parameter tester arrangement enlarged diagram
In figure, 1-stope, 2-stope air return way, 3-face haulage crossheading, 4-working face
Front anallobar, 5-working face front depressor area, 6-working face front voltage stabilizing area, 7-crossheading pre-draining borehole, 8-single hole valve
Door, 9-confluence tube valve, 10-multi parameter tester, 11-collecting pipe, 12-concordant pre-draining borehole towards stope with cutting
Eye angular separation.
Embodiment
As shown in figs. 1 to 6, a kind of high seam concordant pre-draining borehole parameter optimization provided by the invention and extracting result assessment
Method, include 1 front concordant pre-draining borehole of stope, 7 extraction negative pressure differentiation control, 7 cloth hole of concordant pre-draining borehole
Orientation angles optimize, and two rows of concordant pre-draining boreholes 7 (including the first row hole drilling 701-706, second row are arranged along coal seam short transverse
Drill 713-718), the 7 gas pumping effect dynamic evaluation of concordant pre-draining borehole.The 1 front concordant of stope is taken out in advance
The differentiation control for the 7 extraction negative pressure that drill, sets on stope air return way 2 and the confluence of haulage gate 3 manifold 11 and converges
Flow tube valve 9 (including haulage gate 901 and air return way 902), sets single hole valve 8 on each extraction borehole branch pipe
(801-812), changes confluence tube valve 9 (901,902) and single hole valve 8 (801-812) openings of sizes, realizes that concordant takes out brill in advance
The dynamic adjustment of hole 7 (701-712) extraction negative pressure.7 cloth hole orientation angles of the concordant pre-draining borehole optimization, mainly considers two
The factor of a aspect, ensures that concordant pre-draining borehole cloth hole direction is vertical with coal seam biggest principal stress direction as far as possible first, maximum
Principal stress can be drawn according to live detecting earth stress；Secondly consider that concordant pre-draining borehole 7 has with cutting a direction towards stope 1
Certain angle 12, angle are optimal at 15 °~25 °.Described arranges two rows of concordant pre-draining boreholes 7 along coal seam short transverse,
First row concordant pre-draining borehole 701-706 is arranged in 1/3 coal seam and highly locates, and second row concordant pre-draining borehole 713-718 is arranged in
Highly locate in 2/3 coal seam；First row concordant pre-draining borehole 701-706 is used for extraction lower part coal gas, and second row concordant takes out brill in advance
Hole 713-718 is used for extraction top coal gas.The 7 gas pumping effect dynamic evaluation of concordant pre-draining borehole, by
Gas drainage under suction multi-parameter 10 (1001-1012) is installed on extraction pipeline, monitors gas extraction flow and extraction concentration, system
A period of time internal drilling gas pumping scale is counted, with reference to the original gas bearing capacity in coal seam, predicts that the coal seam residual gas after extraction contains
Amount；With reference to the wind resource assessment amount of stope 1, the gas pumping rate of prediction stope 1；Taken out in advance according to the concordant of prediction
Drill the coal seam residual gas content after 7 extractions, the gas pumping rate of working face, evaluates concordant pre-draining borehole extracting result, carries
Go out stope confluence tube valve 9 (including haulage gate 901 and air return way 902) control program.Due to stope
There are depressor area, anallobar and voltage stabilizing area, depressor area coal body in front to be subject to Mining failure serious, and crack is more developed, relatively low
Extraction negative pressure is good with regard to that can reach relatively good extraction, and anallobar is just the opposite；Therefore, 8 openings of sizes of change valve, subtracts
It is small to be open positioned at 5 concordant pre-draining borehole valve 801,802,807,808 of distressed zone in front of stope, so as to reduce back production work
5 concordant pre-draining borehole of square distressed zone in face of making；Increase in front of the stope valve 803 of the extraction borehole of anallobar 4,
804th, 809,810 opening, so as to increase the extraction borehole negative pressure positioned at anallobar 4 in front of stope.The change valve
8 openings of sizes of door, the opening of concordant pre-draining borehole valve 805,806,811,812 positioned at voltage stabilizing area 6 in front of stope are big
It is small, it is adjusted according to single concordant pre-draining borehole methane gas concentration, when single concordant pre-draining borehole (such as 705) device in Gas
When bulk concentration is significantly lower than periphery voltage stabilizing area concordant pre-draining borehole (such as 706) methane gas concentration, reduces the concordant and take out brill in advance
707 valve 805 of hole is open.Confluence 9 control program of tube valve of stope 1, coal seam residual gas after extraction
Content or the gas pumping rate of stope 1 are not up to《Coal mine gas drainage temporary provisions up to standard》It is required that when, increase back production
The confluence tube valve 9 of working face 1 (including haulage gate 901 and air return way 902) opening, or reduce adjacent stope confluence
Pipe valve door opening, realizes and improves 1 collecting pipe of stope, 11 extraction negative pressure.
Claims (8)
1. a kind of high seam concordant pre-draining borehole parameter optimization and the method for extracting result assessment, including stope front are suitable
The differentiation control of layer pre-draining borehole extraction negative pressure, concordant pre-draining borehole cloth hole orientation angles optimization, along coal seam short transverse cloth
Put two rows of concordant pre-draining boreholes, concordant pre-draining borehole gas pumping effect dynamic evaluation.
2. a kind of high seam concordant pre-draining borehole parameter optimization according to claim 1 and the method for extracting result assessment,
It is characterized in that：The differentiation control of concordant pre-draining borehole extraction negative pressure in front of the stope, in stope
Valve is respectively provided with air return way and haulage gate confluence manifold and each extraction borehole branch pipe, changes valve openings size, it is real
The dynamic adjustment of existing concordant pre-draining borehole extraction negative pressure.
3. a kind of high seam concordant pre-draining borehole parameter optimization according to claim 1 and the method for extracting result assessment,
It is characterized in that：The concordant pre-draining borehole cloth hole orientation angles optimization, the main factor for considering two aspects, to the greatest extent may be used first
It can guarantee that concordant pre-draining borehole cloth hole direction is vertical with coal seam biggest principal stress direction, secondly consider that concordant pre-draining borehole is returned with court
Mining face, which cuts a direction, certain angle, and angle is optimal at 15 °~25 °.
4. a kind of high seam concordant pre-draining borehole parameter optimization according to claim 1 and the method for extracting result assessment,
It is characterized in that：Described arranges two rows of concordant pre-draining boreholes along coal seam short transverse, and first row concordant pre-draining borehole is arranged in
1/3 coal seam is highly located, and second row concordant pre-draining borehole is arranged in 2/3 coal seam and highly locates；First row concordant pre-draining borehole is used to take out
Lower part coal gas is adopted, second row concordant pre-draining borehole is used for extraction top coal gas.
5. a kind of high seam concordant pre-draining borehole parameter optimization according to claim 1 and the method for extracting result assessment,
It is characterized in that：The concordant pre-draining borehole gas pumping effect dynamic evaluation, is taken out by installing gas on extraction pipeline
Multi-parameter is put, monitors gas extraction flow and extraction concentration, counts a period of time internal drilling gas pumping scale, with reference to
The original gas bearing capacity in coal seam, predicts the coal seam residual gas content after extraction；With reference to the wind resource assessment amount of stope, prediction
The gas pumping rate of stope；According to the coal seam residual gas content after the concordant pre-draining borehole extraction of prediction, working face
Gas pumping rate, evaluate concordant pre-draining borehole extracting result, propose stope confluence manifold Valve controlling schemes.
6. a kind of high seam concordant pre-draining borehole parameter optimization according to claim 2 and the method for extracting result assessment,
It is characterized in that：The change valve openings size, reduces positioned at distressed zone concordant pre-draining borehole valve in front of stope
Door opening, valve openings of the increase positioned at the extraction borehole of anallobar in front of stope.
7. a kind of high seam concordant pre-draining borehole parameter optimization according to claim 2 and the method for extracting result assessment,
It is characterized in that：The change valve openings size, the concordant pre-draining borehole valve positioned at voltage stabilizing area in front of stope
Openings of sizes, is adjusted according to single concordant pre-draining borehole methane gas concentration, when single concordant pre-draining borehole methane gas
When concentration is significantly lower than periphery voltage stabilizing area concordant pre-draining borehole methane gas concentration, reduce the concordant pre-draining borehole valve openings.
8. a kind of high seam concordant pre-draining borehole parameter optimization according to claim 5 and the method for extracting result assessment,
It is characterized in that：The stope collecting pipe Valve controlling scheme, coal seam residual gas content after extraction or is returned
The gas pumping rate of mining face is not up to《Coal mine gas drainage temporary provisions up to standard》It is required that when, increase stope confluence
Pipe valve door opening, or reduce adjacent stope collecting pipe valve openings, realize that improving stope collecting pipe extraction bears
Pressure.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110685732A (en) * | 2019-09-29 | 2020-01-14 | 华北科技学院 | Coal seam drilling gas extraction method based on extraction pipeline valve control |
| CN112211666A (en) * | 2020-09-30 | 2021-01-12 | 四川华蓥山龙滩煤电有限责任公司 | Coal face blind area distinguishing method |
| CN112647906A (en) * | 2020-12-18 | 2021-04-13 | 华能煤炭技术研究有限公司 | Method for extracting gas from ground of multi-goaf without coal pillar |
| CN115110921A (en) * | 2022-07-18 | 2022-09-27 | 中煤科工集团重庆研究院有限公司 | Pressure-maintaining displacement extraction method for gas in permeability anisotropic coal seam |
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