CN109578058A - A method of extraction borehole gas extraction concentration is improved by auxiliary bore hole - Google Patents
A method of extraction borehole gas extraction concentration is improved by auxiliary bore hole Download PDFInfo
- Publication number
- CN109578058A CN109578058A CN201811501343.0A CN201811501343A CN109578058A CN 109578058 A CN109578058 A CN 109578058A CN 201811501343 A CN201811501343 A CN 201811501343A CN 109578058 A CN109578058 A CN 109578058A
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- extraction
- gas
- auxiliary bore
- bore hole
- borehole
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- 238000000605 extraction Methods 0.000 title claims abstract description 117
- 238000005553 drilling Methods 0.000 claims abstract description 44
- 239000003245 coal Substances 0.000 claims abstract description 28
- 239000002002 slurry Substances 0.000 claims abstract description 19
- 238000000034 method Methods 0.000 claims abstract description 17
- 238000007789 sealing Methods 0.000 claims abstract description 13
- 230000000903 blocking effect Effects 0.000 claims abstract description 3
- 238000007569 slipcasting Methods 0.000 claims abstract description 3
- 239000004615 ingredient Substances 0.000 claims description 9
- 239000000463 material Substances 0.000 claims description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 8
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 6
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims description 6
- 239000000203 mixture Substances 0.000 claims description 6
- 229920000742 Cotton Polymers 0.000 claims description 3
- 239000004115 Sodium Silicate Substances 0.000 claims description 3
- ONCZQWJXONKSMM-UHFFFAOYSA-N dialuminum;disodium;oxygen(2-);silicon(4+);hydrate Chemical group O.[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[Na+].[Na+].[Al+3].[Al+3].[Si+4].[Si+4].[Si+4].[Si+4] ONCZQWJXONKSMM-UHFFFAOYSA-N 0.000 claims description 3
- PAZHGORSDKKUPI-UHFFFAOYSA-N lithium metasilicate Chemical compound [Li+].[Li+].[O-][Si]([O-])=O PAZHGORSDKKUPI-UHFFFAOYSA-N 0.000 claims description 3
- 229910052912 lithium silicate Inorganic materials 0.000 claims description 3
- 229920002635 polyurethane Polymers 0.000 claims description 3
- 239000004814 polyurethane Substances 0.000 claims description 3
- 239000000377 silicon dioxide Substances 0.000 claims description 3
- 229940080314 sodium bentonite Drugs 0.000 claims description 3
- 229910000280 sodium bentonite Inorganic materials 0.000 claims description 3
- 239000011780 sodium chloride Substances 0.000 claims description 3
- 235000019795 sodium metasilicate Nutrition 0.000 claims description 3
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 3
- 229910052911 sodium silicate Inorganic materials 0.000 claims description 3
- 238000002347 injection Methods 0.000 claims description 2
- 239000007924 injection Substances 0.000 claims description 2
- 238000005086 pumping Methods 0.000 abstract description 6
- 208000019901 Anxiety disease Diseases 0.000 abstract description 3
- 230000036506 anxiety Effects 0.000 abstract description 3
- 238000009412 basement excavation Methods 0.000 abstract description 3
- 238000005065 mining Methods 0.000 abstract description 3
- 239000007789 gas Substances 0.000 description 35
- 230000000694 effects Effects 0.000 description 4
- 238000010276 construction Methods 0.000 description 3
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 3
- 238000004891 communication Methods 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 241001074085 Scophthalmus aquosus Species 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000001934 delay Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000005431 greenhouse gas Substances 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK 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
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Drilling And Exploitation, And Mining Machines And Methods (AREA)
- Excavating Of Shafts Or Tunnels (AREA)
Abstract
The invention discloses a kind of methods for improving extraction borehole gas extraction concentration by auxiliary bore hole, the following steps are included: the first step, multiple extraction boreholes of being constructed side by side on the coal seam of tunnel using the drilling machine of minor diameter bar, carry out reaming on the basis of the drilling machine using major diameter drilling rod is in above-mentioned drilling；Second step carries out after effectively blocking drilling, carries out preliminary extraction to gas in drilling using gas drainage pipe；When gas extraction concentration is lower than 50%, extraction borehole is further blocked and fills semifluid slurries in sealing section；Third step, when gas density is lower than 30%, constructed several auxiliary bore holes with the drilling machine of minor diameter bar in the surrounding of extraction borehole side by side, and closure slip casting is carried out to auxiliary bore hole.Hole pumping and mining utilization rate and gas extraction concentration can be improved in the present invention, shortens effective extraction period, the phenomenon of link excavation replacement anxiety, and easy to operate, low in cost.
Description
Technical field
The present invention relates to a kind of gas pumping methods, and in particular to a kind of to improve extraction borehole gas pumping by auxiliary bore hole
The method for adopting concentration belongs to fire damp Prevention Technique field.
Background technique
With the increase of coal mining depth, the gas problem of coal mine is got worse, especially high methane low-permeable coal
The gas control problem of layer, seriously restricts always the safety in production of coal mine.Therefore, coal bed drilling gas drainage is as prevention and treatment watt
This important measures outstanding is widely used always, but during gas drainage, always exists that extraction concentration is low, effect
The various problems such as fruit is poor, the duration is short.
In order to improve coal bed drilling gas pumping effect, China's majority projecting mine mostly uses high negative pressure, big flow extraction
System, but it is bound to cause air leakage increase in this way, gas extraction concentration reduces, and does not shorten gas effective extraction week not only in this way
Phase alleviates the phenomenon of excavation replacement anxiety, makes gas drainage pumping plant extraction concentration lower than 30% instead, so that " coal mine be not achieved
Safety code " as defined in gas utilization condition and gas is emptied, environment is impacted.
And coal bed drilling is unavoidably influenced by each combined factors of crustal stress during coal bed drilling gas drainage, to make
Crack is constantly developed around coal bed drilling, and outside air is caused to be easy to enter from these cracks under the action of extraction negative pressure to take out
Cause gas extraction concentration to decline in borehole, shortens effective extraction period of extraction borehole, reduce the utilization of extraction borehole
Rate.
Summary of the invention
In order to overcome various deficiencies of the existing technology, the present invention provides one kind and improves extraction borehole by auxiliary bore hole
Hole pumping and mining utilization rate and gas extraction concentration can be improved in the method for gas extraction concentration, shortens effective extraction period, delays
The phenomenon of excavation replacement anxiety is solved, and easy to operate, it is low in cost.
For achieving the above object, the present invention provides a kind of by auxiliary bore hole raising extraction borehole gas extraction concentration
Method, comprising the following steps:
The first step, multiple extraction boreholes of being constructed side by side on the coal seam of tunnel using the drilling machine of minor diameter bar, using greatly
The drilling machine of diameter drilling rod carries out reaming on the basis of above-mentioned drilling；
Second step carries out after effectively blocking drilling, carries out preliminary extraction to gas in drilling using gas drainage pipe；When
When gas extraction concentration is lower than 50%, extraction borehole is further blocked and fills semifluid slurries in sealing section；
Third step, when gas density be lower than 30% when, the surrounding with the drilling machine of minor diameter bar in extraction borehole side by side is applied
Several auxiliary bore holes of work, and closure slip casting is carried out to auxiliary bore hole.
Aperture is carried out first with minor diameter bar, recycles the reaming of major diameter drilling rod, can reduce drilling surrounding crack
It generates；By making the crack around extraction borehole in involved subterranean zone leak out in extraction borehole surrounding construction auxiliary bore hole
Channel obtains effective communication；Semifluid slurries crack to around is injected in extraction borehole closed section and auxiliary bore hole to carry out
It blocks, since semifluid slurries have mobility, compared to traditional solid sealing of hole, it is easier to enter minute fissure, envelope
Block up tiny leakage path.
Distance L=0.43H ± l between each extraction borehole center side by side0, H is the height in coal seam, error l0It must not exceed
0.0625H。
Preferably, the surrounding of each extraction borehole is evenly distributed with three auxiliary bore holes, and is located at auxiliary between two extraction boreholes
Drilling is helped to share for two extraction boreholes, three auxiliary bore holes are equal with the distance between extraction borehole center, and each extraction is bored
Angle between the corresponding each auxiliary bore hole in hole and the extraction borehole line of centres is 120 °.
Specifically, the distance between three auxiliary bore holes and extraction borehole center l=0.25H ± l0, H is the height in coal seam
Degree, error l0It must not exceed 0.0625H.
Extraction borehole and auxiliary bore hole axial direction are non-intersecting, and auxiliary bore hole depth is less than 1~3m of extraction borehole depth.
In second step, when preliminary extraction, drilling is blocked using the gas drainage pipe of both ends binding cotton；Gas is taken out
When adopting concentration lower than 50%, extraction borehole is further blocked in such a way that polyurethane sealing of hole bag is installed at both ends.
Semifluid slurries include major ingredient, auxiliary material and water, and wherein major ingredient is sodium bentonite and kaolinic mixture, auxiliary material
For the mixture of one or more of sodium metasilicate, lithium metasilicate, silica, sodium chloride, major ingredient adds the quality of auxiliary material
Mass ratio with water is 1:12~1:8.
The semifluid slurries mixed are non-condensable, inorganic semifluid sealing of hole slurries, and are begun during entire block
Not dewatering state is kept eventually, to maintain certain mobility；Cementing fluid can also play certain elasticity branch to the wall of a borehole
Support effect, effectively increases the compactness of sealing section, reduces the seepage discharge of continuous action static pressure water.
After the corresponding auxiliary bore hole of extraction borehole of having constructed, with 2~3MPa pressure simultaneously to extraction borehole and auxiliary drill
Semifluid slurries are injected in hole to block crack in entire coal seam.
The present invention uses the drilling machine of bradawl shank diameter to carry out aperture first, reuses big drill pipe diameter drilling machine reaming, reduces
Influence of the stress variation to coal seam, therefore can utmostly reduce the generation of borehole fissure；And by extraction borehole surrounding
Construction depth be less than extraction borehole auxiliary bore hole, formed centered on each extraction borehole, radius for H/2 round seam area
Whole cracks channel of leaking out all effectively is blocked in domain；It is blocked using semifluid slurries, and maintains certain pressure, because
This once has new cranny development to generate, and self-plugging may be implemented.Present invention dramatically increases gas extraction concentrations, are especially suitable for
The coal bed drilling later period gas drainage arranged in a side-by-side fashion, can more extractions by this method when gas extraction concentration is lower
Gas resources are effectively utilized in more gas, promote Safety of Coal Mine Production, reduce greenhouse gas emission.
Detailed description of the invention
Fig. 1 is extraction borehole and auxiliary bore hole arranged schematic diagram in the present invention；
In figure: 1, auxiliary bore hole, 2, extraction borehole, 3, coal road coal seam.
Specific embodiment
The present invention is described in detail in the following with reference to the drawings and specific embodiments.
As shown in Figure 1, a kind of method that extraction borehole gas extraction concentration is improved by auxiliary bore hole, including following step
It is rapid:
The first step, multiple extraction boreholes of being constructed side by side on the coal seam of tunnel using the drilling machine of 30mm drilling rod are utilizing 80mm
The drilling machine of drilling rod carries out reaming on the basis of 30mm drills；Distance L=0.43H ± l between 2 center of each extraction borehole side by side0,
H is the height in coal seam, error l0It must not exceed 0.0625H；
Second step blocks drilling using the gas drainage pipe of both ends binding cotton, using gas drainage pipe to brill
Gas carries out preliminary extraction in hole；When gas extraction concentration is lower than 50%, in such a way that polyurethane sealing of hole bag is installed at both ends
Extraction borehole is further blocked, and fills semifluid slurries in sealing section；
Third step, when gas density is lower than 30%, the surrounding with the drilling machine of 30mm drilling rod in extraction borehole side by side is constructed
Several auxiliary bore holes, extraction borehole 2 and 1 axial direction of auxiliary bore hole are non-intersecting, and 1 depth of auxiliary bore hole is less than extraction borehole 2
1~3m of depth；
The surrounding of each extraction borehole 2 is evenly distributed with three auxiliary bore holes 1, and the auxiliary drill being located between two extraction boreholes 2
Hole 1 is that two extraction boreholes 2 share, and three auxiliary bore holes 1 are equal with the distance between 2 center of extraction borehole, and each extraction is bored
Angle between the corresponding each auxiliary bore hole 1 in hole 2 and 2 line of centres of extraction borehole is 120 °；Three auxiliary bore holes 1 and extraction
Drill the distance between 2 centers l=0.25H ± l0, H is the height in coal seam, error l0It must not exceed 0.0625H；
After the corresponding auxiliary bore hole 1 of extraction borehole of having constructed, with 2~3MPa pressure simultaneously to extraction borehole 2 and auxiliary
Injection semifluid slurries block crack in entire coal seam in drilling 1.
Aperture is carried out first with minor diameter bar, recycles the reaming of major diameter drilling rod, can reduce drilling surrounding crack
It generates；By making the crack around extraction borehole in involved subterranean zone leak out in extraction borehole surrounding construction auxiliary bore hole
Channel obtains effective communication；Semifluid slurries crack to around is injected in extraction borehole closed section and auxiliary bore hole to carry out
It blocks, since semifluid slurries have mobility, compared to traditional solid sealing of hole, it is easier to enter minute fissure, envelope
Block up tiny leakage path.
Semifluid slurries include major ingredient, auxiliary material and water, and wherein major ingredient is sodium bentonite and kaolinic mixture, auxiliary material
For the mixture of one or more of sodium metasilicate, lithium metasilicate, silica, sodium chloride, major ingredient adds the quality of auxiliary material
Mass ratio with water is 1:12~1:8.
The semifluid slurries mixed are non-condensable, inorganic semifluid sealing of hole slurries, and are begun during entire block
Not dewatering state is kept eventually, to maintain certain mobility；Cementing fluid can also play certain elasticity branch to the wall of a borehole
Support effect, effectively increases the compactness of sealing section, reduces the seepage discharge of continuous action static pressure water.
Claims (8)
1. a kind of method for improving extraction borehole gas extraction concentration by auxiliary bore hole, comprising the following steps:
The first step is constructed multiple extraction boreholes (2) side by side using the drilling machine of minor diameter bar on the coal seam of tunnel, big straight utilizing
The drilling machine of diameter drilling rod carries out reaming on the basis of above-mentioned drilling；
Second step carries out after effectively blocking drilling, carries out preliminary extraction to gas in drilling using gas drainage pipe；Work as gas
When extraction concentration is lower than 50%, extraction borehole (2) is further blocked and fills semifluid slurries in sealing section；
Third step, when gas density is lower than 30%, if the surrounding with the drilling machine of minor diameter bar in extraction borehole side by side is constructed
Dry auxiliary bore hole (1), and closure slip casting is carried out to auxiliary bore hole (2).
2. the method according to claim 1 for improving extraction borehole gas extraction concentration by auxiliary bore hole, feature exist
In distance L=0.43H ± l between each extraction borehole (2) center side by side0, H is the height in coal seam, error l0It must not exceed
0.0625H。
3. the method according to claim 1 for improving extraction borehole gas extraction concentration by auxiliary bore hole, feature exist
In the surrounding of each extraction borehole (2) is evenly distributed with three auxiliary bore holes (1), and the auxiliary drill being located between two extraction boreholes (2)
Hole (1) is that two extraction boreholes (2) share, and three auxiliary bore holes (1) are equal with the distance between extraction borehole (2) center, often
Angle between the corresponding each auxiliary bore hole (1) of a extraction borehole (2) and extraction borehole (2) line of centres is 120 °.
4. the method according to claim 3 for improving extraction borehole gas extraction concentration by auxiliary bore hole, feature exist
In the distance between three auxiliary bore holes (1) and extraction borehole (2) center l=0.25H ± l0, H is the height in coal seam, error l0
It must not exceed 0.0625H.
5. the method according to claim 4 for improving extraction borehole gas extraction concentration by auxiliary bore hole, feature exist
In extraction borehole (2) and auxiliary bore hole (1) axial direction are non-intersecting, and auxiliary bore hole (1) depth is less than extraction borehole depth 1
~3m.
6. the method according to claim 5 for improving extraction borehole gas extraction concentration by auxiliary bore hole, feature exist
In when preliminary extraction, being blocked using the gas drainage pipe of both ends binding cotton to drilling in second step；Gas drainage is dense
When degree is lower than 50%, extraction borehole is further blocked in such a way that polyurethane sealing of hole bag is installed at both ends.
7. improving extraction borehole gas extraction concentration by auxiliary bore hole to described in 6 any claims according to claim 1
Method, which is characterized in that semifluid slurries include major ingredient, auxiliary material and water, and wherein major ingredient is sodium bentonite and kaolinic
Mixture, auxiliary material are the mixture of one or more of sodium metasilicate, lithium metasilicate, silica, sodium chloride, and major ingredient adds
The quality of auxiliary material and the mass ratio of water are 1:12~1:8.
8. the method according to claim 7 for improving extraction borehole gas extraction concentration by auxiliary bore hole, feature exist
In after the corresponding auxiliary bore hole of extraction borehole of having constructed (1), with 2~3MPa pressure simultaneously to extraction borehole (2) and auxiliary drill
Injection semifluid slurries block crack in entire coal seam in hole (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811501343.0A CN109578058B (en) | 2018-12-10 | 2018-12-10 | Method for improving gas extraction concentration of extraction borehole through auxiliary drilling |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811501343.0A CN109578058B (en) | 2018-12-10 | 2018-12-10 | Method for improving gas extraction concentration of extraction borehole through auxiliary drilling |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109578058A true CN109578058A (en) | 2019-04-05 |
| CN109578058B CN109578058B (en) | 2021-05-14 |
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ID=65927894
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811501343.0A Active CN109578058B (en) | 2018-12-10 | 2018-12-10 | Method for improving gas extraction concentration of extraction borehole through auxiliary drilling |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111173556A (en) * | 2020-01-13 | 2020-05-19 | 中煤平朔集团有限公司 | Method for preventing borehole collapse during large-diameter borehole replacement traversing |
| CN112627766A (en) * | 2020-12-23 | 2021-04-09 | 中煤科工集团重庆研究院有限公司 | External injection compensation type hole sealing structure and method for gas extraction drill hole |
| CN113464122A (en) * | 2021-06-23 | 2021-10-01 | 中国矿业大学 | Method for improving gas pressure determination accuracy through auxiliary drilling |
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| US6280000B1 (en) * | 1998-11-20 | 2001-08-28 | Joseph A. Zupanick | Method for production of gas from a coal seam using intersecting well bores |
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| CN104975868A (en) * | 2015-06-13 | 2015-10-14 | 山西晋城无烟煤矿业集团有限责任公司 | Top plate high-position boring large-diameter long-drill-hole gas extraction method based on directional drilling |
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| CN106220121A (en) * | 2016-07-21 | 2016-12-14 | 中煤科工集团重庆研究院有限公司 | Coal-philic gas extraction drilling and hole sealing material and using method thereof |
| CN108150127A (en) * | 2018-02-13 | 2018-06-12 | 安徽佳泰矿业科技有限公司 | Mine gas extraction drilling and sealing device and method for sealing |
| CN108316964A (en) * | 2018-02-01 | 2018-07-24 | 西安科技大学 | A kind of low air permeability coal seam pressure relief gas pumping mining method |
| CN108590742A (en) * | 2018-05-10 | 2018-09-28 | 西安科技大学 | Reducing reaming improves the mine gas extraction system and method for gas extraction concentration |
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2018
- 2018-12-10 CN CN201811501343.0A patent/CN109578058B/en active Active
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| US6280000B1 (en) * | 1998-11-20 | 2001-08-28 | Joseph A. Zupanick | Method for production of gas from a coal seam using intersecting well bores |
| CN102434194A (en) * | 2011-09-30 | 2012-05-02 | 神华集团有限责任公司 | Gas drainage drill hole structure formed in coal layer and method for fabricating same |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111173556A (en) * | 2020-01-13 | 2020-05-19 | 中煤平朔集团有限公司 | Method for preventing borehole collapse during large-diameter borehole replacement traversing |
| CN111173556B (en) * | 2020-01-13 | 2022-04-05 | 中煤平朔集团有限公司 | Method for preventing borehole collapse during large-diameter borehole replacement traversing |
| CN112627766A (en) * | 2020-12-23 | 2021-04-09 | 中煤科工集团重庆研究院有限公司 | External injection compensation type hole sealing structure and method for gas extraction drill hole |
| CN112627766B (en) * | 2020-12-23 | 2022-12-27 | 中煤科工集团重庆研究院有限公司 | External injection compensation type hole sealing method for gas extraction drill hole |
| CN113464122A (en) * | 2021-06-23 | 2021-10-01 | 中国矿业大学 | Method for improving gas pressure determination accuracy through auxiliary drilling |
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| CN109578058B (en) | 2021-05-14 |
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