CN115163026B - Layer penetrating drilling arrangement method for protective layer under long-distance coal seam - Google Patents
Layer penetrating drilling arrangement method for protective layer under long-distance coal seam Download PDFInfo
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- CN115163026B CN115163026B CN202210754013.2A CN202210754013A CN115163026B CN 115163026 B CN115163026 B CN 115163026B CN 202210754013 A CN202210754013 A CN 202210754013A CN 115163026 B CN115163026 B CN 115163026B
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- holes
- coal seam
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- 238000005553 drilling Methods 0.000 title claims abstract description 93
- 239000010410 layer Substances 0.000 title claims abstract description 90
- 239000003245 coal Substances 0.000 title claims abstract description 55
- 230000000149 penetrating effect Effects 0.000 title claims abstract description 51
- 239000011241 protective layer Substances 0.000 title claims abstract description 30
- 238000000034 method Methods 0.000 title claims abstract description 16
- 238000000605 extraction Methods 0.000 claims abstract description 10
- 230000035699 permeability Effects 0.000 claims abstract description 9
- 238000010276 construction Methods 0.000 claims description 15
- 239000011435 rock Substances 0.000 claims description 3
- 238000007789 sealing Methods 0.000 claims description 3
- 238000005065 mining Methods 0.000 abstract description 4
- 230000000694 effects Effects 0.000 abstract description 3
- 230000008030 elimination Effects 0.000 abstract description 3
- 238000003379 elimination reaction Methods 0.000 abstract description 3
- 241000668854 Howardia biclavis Species 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
Classifications
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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
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/30—Specific pattern of wells, e.g. optimising the spacing of 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
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/006—Production of coal-bed methane
-
- 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
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
-
- 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
- E21B7/00—Special methods or apparatus for drilling
- E21B7/04—Directional drilling
-
- 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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/20—Hydro energy
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Geochemistry & Mineralogy (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Road Paving Structures (AREA)
Abstract
The invention discloses a method for arranging a layer penetrating drill hole of a protective layer under a long-distance coal seam, which is characterized by comprising the following steps of: the method comprises the following steps: the working face of the lower protective layer is arranged, the layer penetrating drilling sites are arranged, the parameters of the layer penetrating drilling sites are determined, the layer penetrating drilling positions are arranged, and the falling point distances of the layer penetrating drilling sites are determined. The system is simple, is easy to operate and construct, can realize reasonable arrangement of the layer penetrating holes of the protected layer under the condition of mining the protected layer in a long distance, improves the air permeability of the coal bed, and can improve the gas extraction efficiency of the holes so as to achieve a better outburst elimination effect.
Description
Technical Field
The invention relates to the technical field of underground coal mine gas control, in particular to a method for arranging layer-penetrating drilling holes of a long-distance coal seam lower protective layer, which is suitable for reasonable arrangement of the layer-penetrating drilling holes of the long-distance coal seam lower protective layer.
Background
Along with the continuous expansion of the coal mining scale, the mining depth is increased year by year, the occurrence condition of the coal seam is more complex, the ground stress is increased, the gas content of the coal seam is high, the gas permeability is poor, the gas extraction difficulty is high, and the gas extraction technology faces the difficulty; the mining and penetrating drilling of the protective layer are effective measures for preventing coal and gas from protruding out of a mine, elastic potential inside the protected layer can be released, the fracture field of the coal layer is changed, the air permeability of the coal layer is increased, and a channel is provided for the migration of the gas occurring in the coal layer; however, under the condition of exploitation of a long-distance lower protective layer, the exploitation of the exploitation fracture is highly limited, the pressure relief of the protected layer is insufficient, the construction of the layer penetrating and drilling from the lower protective layer to the protected layer is relatively difficult, the technology and the construction parameters are not clear, and the requirements on construction equipment and construction operation are relatively high.
The system is simple, is easy to operate and construct, can realize reasonable arrangement of the layer penetrating holes of the protected layer under the condition of mining the protected layer in a long distance, improves the air permeability of the coal bed, and can improve the gas extraction efficiency of the holes so as to achieve a better outburst elimination effect.
Disclosure of Invention
Aiming at the problems of low gas extraction efficiency and poor outburst elimination effect of the existing long-distance through-layer drilling holes, the invention provides a method for arranging the through-layer drilling holes of a protective layer under a long-distance coal seam, which aims at optimally arranging the through-layer drilling holes of the protected coal seam, improving the gas permeability of the coal seam and improving the gas extraction efficiency.
In order to achieve the above purpose, the technical scheme of the invention is as follows: the invention discloses a method for arranging a layer penetrating drill hole of a protective layer under a long-distance coal seam, which is characterized by comprising the following steps of: the method comprises the following steps: the working face of the lower protective layer is arranged, the layer penetrating drilling sites are arranged, the parameters of the layer penetrating drilling sites are determined, the layer penetrating drilling positions are arranged, and the falling point distances of the layer penetrating drilling sites are determined.
The method for arranging the penetrating drilling holes of the protective layer under the long-distance coal seam is characterized by comprising the following steps.
Step one, determining the arrangement position of a working surface of a lower protective layer according to a pressure relief area required by the protective layer, arranging the working surface of the lower protective layer along the trend of the coal bed, and determining the length of an open cut to be 240m.
Step two, after the working face is opened and cut through, layer penetrating drill sites are arranged on two sides of the coal wall of the stoping roadway, the design construction of the drill site No. 1 is 20m from the center line of the cut-through roadway, the drill site No. 2 is 40m from the center line of the cut-through roadway, the drill site No. 3 is 60m from the center line of the cut-through roadway, and the like, the adjacent drill sites are arranged at intervals of 20m, and the layer penetrating drill sites of the return air roadway and the conveying roadway are approximately symmetrical in field construction arrangement, so that the layer penetrating drill tracks and the falling points can be uniformly distributed in the protected coal seam.
And thirdly, determining the specification length of the layer-penetrating drilling site to be 8m, determining the width to be 3m, and determining the height of the drilling site to be 3m so as to meet the construction height of the drilling machine, wherein the size of the drilling site meets the requirements of arranging a plurality of drilling holes and facilitating drilling.
Step four, 7 through-layer drilling holes are designed and arranged in each drilling field, the 1-3 through-layer drilling holes are arranged on the right side of the drilling field, the 1-number through-layer drilling holes are arranged at a position 1m away from the edge of a roadway, the height of the 1-5 m away from the bottom plate, and the 2-3 through-layer drilling holes are arranged at intervals of 1m at the same height; the No. 3 through-layer drilling holes are positioned at the upper angle position, the 4-7 through-layer drilling holes are arranged on the front surface of the drilling site at the distance of 1.5m, and the height of the through-layer drilling holes is 1.5m from the bottom plate.
Step five, the penetrating holes are distributed in the protected coal bed in a grid mode, projection of the penetrating holes of the number 1 falls on a drilling field trend central line, the falling point trend distance between the penetrating holes of the number 1 and the penetrating holes of the number 2 is 14.25m, the falling point trend distance between the other adjacent penetrating holes is 18m, and the trend falling point distance is 20m.
Further, in the fourth step, the diameter of the through-layer drilling hole is 94mm, and the length of the hole sealing section is not less than 20m.
Further, in the fourth step, the control range of the through-layer drilling holes along the two sides of the coal seam layer should be not less than 30m; the design of the last drill site is 20m away from the open-cut hole, and the drill hole extraction range in the drill site covers the coal seam outside the central line 40m of the open-cut hole roadway.
In the fifth step, the through-layer drilling final hole should fall to at least 1m rock stratum above the top plate of the protected layer, so that the permeability of the covered coal layer is increased, and the drainage of the pressure relief gas of the protected coal layer is enhanced.
The invention has the advantages and beneficial effects that: the system is simple, easy to operate and construct, and capable of realizing optimal arrangement of long-distance layer penetrating drilling holes of the protected layer, improving the air permeability of the coal stratum to the greatest extent, and improving the gas extraction efficiency of the layer penetrating drilling holes.
Drawings
FIG. 1 is a plan view of a method for arranging a layer penetrating drilling hole of a protective layer under a long-distance coal seam.
FIG. 2 is a cross-sectional view of a method for arranging a through-layer drilling hole of a protective layer under a long-distance coal seam.
In the figure: 1 is a protective layer open-cut eye; 2 is a through-layer drilling site; 3 is a through-layer drilling; 4 is a return airway; 5 is a transport lane; 6 is a working surface of the protective layer; 7 is a tunnel center line; 8 is a lower protection coal seam; 9 is a protected coal seam; 10 is the landing point of the coal seam of the through-layer drilling.
Detailed Description
The invention is described in further detail below with reference to the drawings and examples.
The invention provides a method for arranging a layer penetrating drill hole of a protective layer under a long-distance coal seam, which comprises the following steps.
Step one, determining the arrangement position of the working face of the lower protective layer 8 according to the pressure relief area required by the protected layer 9, arranging the working face 6 of the lower protective layer along the trend of the coal seam, and determining the length of the open cut hole 1 to be 240m.
And step two, after the working face is opened and the cutting hole 1 is communicated, layer penetrating drilling sites 2 are arranged on two sides of the coal wall of the stoping roadway, the design construction of the No. 1 drilling site is 20m from the center line of the roadway of the cutting hole 1, the No. 2 drilling site is 40m … … from the center line of the roadway of the cutting hole 1, and the adjacent drilling sites are arranged at intervals of 20m. The air return roadway 4 and the transportation roadway 5 are approximately symmetrical when being arranged in site construction of the layer penetrating drilling sites, so that the track of the layer penetrating drilling holes 3 and the falling points 10 of the layer penetrating drilling holes can be uniformly distributed in the protected coal bed 9.
Step three, the length of the 2 specifications of the layer-penetrating drilling site is determined to be 8m, the width is 3m, the height of the drilling site is 3m so as to meet the construction height of the drilling machine, and the size of the drilling site meets the requirements of arranging a plurality of drilling holes and facilitating drilling.
Step four, 7 through-layer drilling holes are designed and arranged in each drilling field, the openings of the 1-3 through-layer drilling holes are arranged on the right side of the drilling field, the 1-3 through-layer drilling holes are arranged at a position 1m away from the edge of a roadway, the height of the 1-5 m away from the bottom plate, and the 2-3 through-layer drilling holes are arranged at 1m intervals at the same height; the No. 3 through-layer drilling holes are positioned at the upper angle position, the 4-7 through-layer drilling holes are arranged on the front surface of the drilling site at the distance of 1.5m, and the height of the through-layer drilling holes is 1.5m from the bottom plate.
Fifth, the penetrating holes 3 are distributed in the protected coal seam 9 in a grid mode, the projection of the penetrating holes 1 falls on the trend central line of the drill field, the falling point trend distance between the penetrating holes 1 and the penetrating holes 2 is 14.25m, the falling point trend distance between the other adjacent penetrating holes is 18m, and the trend falling point distance is 20m.
Further, in the fourth step, the diameter of the hole of the through-layer drilling hole 2 is 94mm, and the length of the hole sealing section is not less than 20m.
Further, in the fourth step, the control range of the through-layer drilling holes along the two sides of the coal seam layer should be not less than 30m; the design of the last drill site is 20m away from the open-cut hole, and the drill hole extraction range in the drill site covers the coal seam outside the central line 40m of the open-cut hole roadway.
Further, in the fifth step, the through-layer drilling hole 3 should fall at least 1m rock layer above the top plate 9 of the protected layer, so as to increase the permeability of the covered coal layer and enhance the drainage of the pressure relief gas of the protected coal layer.
The protective scope of the invention is not limited to the description of the embodiments but is defined by the claims.
Claims (4)
1. The method for arranging the penetrating drilling holes of the protective layer under the long-distance coal seam is characterized by comprising the following steps of:
step one, determining the arrangement position of a working surface of a lower protective layer according to a pressure relief area required by the protective layer, arranging the working surface of the lower protective layer along the trend of a coal seam, and determining the length of an open cut to be 240m;
step two, after the working face is opened and cut through, layer penetrating drill sites are arranged on two sides of the coal wall of the stoping roadway, the design construction of the No. 1 drill site is 20m from the center line of the cut-through roadway, the design construction of the No. 2 drill site is 40m from the center line of the cut-through roadway, the design construction of the No. 3 drill site is 60m from the center line of the cut-through roadway, and the like, the adjacent drill sites are arranged at intervals of 20m, and the layer penetrating drill sites of the return air roadway and the transport roadway are approximately symmetrical in construction and arrangement, so that the layer penetrating drill tracks and landing points can be uniformly distributed in a protected coal seam;
thirdly, determining the specification length of the layer-penetrating drilling site to be 8m, determining the width to be 3m, and determining the height of the drilling site to be 3m so as to meet the construction height of a drilling machine, wherein the size of the drilling site meets the requirements of arranging a plurality of drilling holes and facilitating drilling;
step four, 7 through-layer drilling holes are designed and arranged in each drilling field, the 1-3 through-layer drilling holes are arranged on the right side of the drilling field, the 1-number through-layer drilling holes are arranged at a position 1m away from the edge of a roadway, the height is 1.5m away from a bottom plate, the 2-number through-layer drilling holes and the 3-number through-layer drilling holes are arranged at intervals of 1m at the same height, the 3-number through-layer drilling holes are positioned at the side angle position, the 4-7 through-layer drilling holes are arranged on the front surface of the drilling field and at intervals of 1.5m away from the bottom plate, and the height is 1.5m away from the bottom plate;
step five, the penetrating holes are distributed in the protected coal bed in a grid mode, projection of the penetrating holes of the number 1 falls on a drilling field trend central line, the falling point trend distance between the penetrating holes of the number 1 and the penetrating holes of the number 2 is 14.25m, the falling point trend distance between the other adjacent penetrating holes is 18m, and the trend falling point distance is 20m.
2. According to the method for arranging the layer penetrating drilling holes of the protective layer under the long-distance coal seam, in the fourth step, the diameter of the layer penetrating drilling holes is 94mm, and the length of the hole sealing section is not less than 20m.
3. According to the method for arranging the layer penetrating drill holes of the protective layer under the long-distance coal seam, in the fourth step, the control range of the layer penetrating drill holes along two sides of the coal seam layer surface is not less than 30m, the last drill site is designed to be 20m away from the cutting holes, and the drill hole extraction range in the drill site covers the coal seam outside the center line 40m of the cutting hole roadway.
4. According to the method for arranging the layer-penetrating drilling holes of the protective layer under the long-distance coal seam, in the fifth step, the layer-penetrating drilling holes are at least 1m rock stratum above the top plate of the protected layer, so that the permeability of the covered coal seam is increased, and the pressure relief gas drainage of the protected coal seam is enhanced.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210754013.2A CN115163026B (en) | 2022-06-30 | 2022-06-30 | Layer penetrating drilling arrangement method for protective layer under long-distance coal seam |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210754013.2A CN115163026B (en) | 2022-06-30 | 2022-06-30 | Layer penetrating drilling arrangement method for protective layer under long-distance coal seam |
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| Publication Number | Publication Date |
|---|---|
| CN115163026A CN115163026A (en) | 2022-10-11 |
| CN115163026B true CN115163026B (en) | 2023-08-01 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202210754013.2A Active CN115163026B (en) | 2022-06-30 | 2022-06-30 | Layer penetrating drilling arrangement method for protective layer under long-distance coal seam |
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Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102116169A (en) * | 2011-01-27 | 2011-07-06 | 中国矿业大学 | Drainage method for pressure-relief gas baseboard stonehead of protected seam |
| CN102644476B (en) * | 2012-05-10 | 2014-06-18 | 中国矿业大学 | Method for pumping gas of protected layer by layer penetration and hole drilling on high-position drilling fields of protecting layer machinery tunnel |
| CN103306713B (en) * | 2013-05-20 | 2015-12-09 | 中国矿业大学 | Networked reinforcement method for cross-layer drilling of outburst coal seam |
| CN106223998B (en) * | 2016-09-23 | 2018-05-01 | 安徽理工大学 | Rock protective layer face gas administering method under a kind of closely tight roof |
| CN106948859B (en) * | 2017-03-20 | 2018-07-27 | 中国矿业大学 | A kind of networking advantage gas migration channel structure and gas water conservancy diversion pumping method |
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