CN112412527A - Centralized gas treatment method for coal groups in close-distance coal seam group - Google Patents
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- 238000005065 mining Methods 0.000 claims abstract description 91
- 239000010410 layer Substances 0.000 claims abstract description 73
- 238000005553 drilling Methods 0.000 claims abstract description 28
- 239000011241 protective layer Substances 0.000 claims abstract description 15
- 238000010276 construction Methods 0.000 claims abstract description 14
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- 230000009286 beneficial effect Effects 0.000 description 1
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Abstract
The invention discloses a centralized gas treatment method for coal groups in close-range coal seam groups, which comprises the following steps: ensuring that the pressure relief protection range covers other mineable coal layers after the first mining layer is mined according to the gas parameters and the outburst danger degree of each coal layer of the medium coal group and the development range of a gas emission channel formed by the movement, deformation and fracture of the top and bottom rock layers of each coal layer influenced by the mining of the first mining layer; arranging a first mining face in a first mining layer, determining a stoping roadway of the first mining face, and arranging a gas centralized control roadway according to the thickness of each coal seam, the interlayer spacing, the drilling construction difficulty and the control range; constructing a layer-crossing long drill hole in a gas centralized control roadway, pre-pumping gas strips on two roadways of a first mining surface of a protective layer, and continuously drilling after the drill hole penetrates through the first mining layer until all coal seams on the upper part of a medium coal group are penetrated; during the heading period of the first mining face stoping roadway, the construction of the cross-layer drilling hole is continued, and the gas of each coal seam in the stoping area of the first mining face of the middle coal group and the pressure relief area thereof is pre-pumped, so that the gas treatment engineering quantity during the stoping period is reduced.
Description
Technical Field
The invention relates to a gas treatment method, in particular to a centralized gas treatment method for coal groups in a close-distance coal seam group, and belongs to the technical field of coal mine gas treatment.
Background
In recent years, along with the increase of the coal mining depth, the coal bed gas pressure and the gas content gradually increase, the difficulty of mine gas control is increased, gas disasters are more prominent, gas accidents are likely to occur at any time, the safety production of the coal mines in China is seriously threatened, particularly, Guizhou province is the most serious condition, most of the mines in the area are coal and gas outburst mines, the coal bed group mining belongs to the close-distance coal bed group mining, the occurrence conditions of the coal bed are complex, the gas control work severely restricts the safety production of the mines, and an effective method for close-distance coal bed group gas control is urgently.
The number of the coal seams of the same coal-containing geological system mined by the short-distance coal seam group in the southwest mining area can reach dozens of layers, a descending mining mode is generally adopted, and the coal seams are divided into an upper coal group, a middle coal group and a lower coal group by combining the layer number, the layer spacing, the laying state, the burial depth and the mining mode. The medium coal group has good coal quality development, high coal seam gas content and high outburst risk, after the upper coal group is mined, the most overlying coal seam of the medium coal group cannot be effectively protected by pressure relief due to large interlayer spacing, and the lower coal group temporarily does not have mining conditions due to coal quality, thick coal and the like. In order to safely and smoothly mine each coal seam of the medium coal group, a gas treatment method must be appropriate, and control measures must be in place.
In order to carry out the extraction of each coal seam of a medium coal group, the coal seam with relatively low gas content and large safety factor is selected as a protective layer, a gas treatment space is provided for the protective layer through a construction gas treatment roadway, and gas on other adjacent layers except the protective layer is pre-extracted by combining the space effect of coal seam mining fracture evolution and the gas migration rule, so that the gas concentration treatment of each coal seam of the medium coal group is realized.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the centralized gas treatment method for the coal seam groups in the close-range coal seam group is provided, a proper layer is selected in the medium coal seam group to arrange a gas centralized treatment roadway, layer-crossing long drill holes are constructed on two sides of a stoping roadway of a first mining face, strip gas of the stoping roadway and gas of adjacent layers are pre-pumped, the content and pressure of a protective layer and gas of adjacent coal seams in a tunneling range are reduced, and outburst danger is eliminated; in the protective layer stoping process, the roadway is controlled through gas concentration to be pre-pumped, and the gas emission flow direction of a near layer is changed, so that the pressure relief gas of the protective layer is reduced to the maximum extent and is emitted to the protective layer mining space, the difficulty in gas control during subsequent stoping is reduced, the gas concentration control of the medium coal group is realized, and the existing problems are effectively solved.
The technical scheme of the invention is as follows: a centralized gas treatment method for coal groups in close-distance coal seam groups comprises the following steps:
firstly, a middle coal group in a close-distance coal bed group is not mined, coal beds mined by an upper coal group and a lower coal group cannot perform pressure relief protection on coal beds at the top and the bottom of the middle coal group, and the pressure relief protection range covers other coal beds capable of being mined after the first mining layer is mined according to the gas parameters and the outburst danger degree of each coal bed of the middle coal group and the development range of a gas emission channel formed by the movement, deformation and fracture of rock strata at the top and the bottom of each coal bed influenced by the mining of the first mining layer;
secondly, arranging a first mining surface in the first mining layer, determining a stoping roadway of the first mining surface, and arranging a gas centralized control roadway according to the thickness of each coal seam, the interval of the layers, the drilling construction difficulty and the control range;
thirdly, constructing the control roadway by adopting a high-power drilling machine, ensuring that the pre-pumping range of the drilled hole covers the stoping roadway, the stoping area and the adjacent layer pressure relief area, and performing centralized extraction of coal roadway stripe gas and pressure relief gas;
fourthly, conducting construction layer-penetrating long drilling in the gas centralized control roadway, pre-pumping gas strips on two roadway strips on the first mining surface of the protective layer, and continuing drilling after the drilling holes penetrate through the first mining layer until all coal seams on the upper part of the medium coal group are penetrated, so that the gas content and the gas pressure of the coal seams in the tunneling area of the first mining surface stoping roadway are reduced, and the outburst danger is eliminated;
and fifthly, during the heading period of the first mining face stoping roadway, constructing the cross-layer drilling hole to pre-pump the gas of each coal bed in the stoping area of the first mining face of the medium coal group and the pressure relief area thereof, and reducing the gas treatment engineering quantity during the stoping period.
And the distance between the drill holes in the first mining layer is 5-8m, and the drill holes continue to drill after penetrating the first mining layer until all coal seams at the upper part of the middle coal group are penetrated.
The control range is 15m on each side of the roadway contour line.
The invention has the beneficial effects that: compared with the prior art, the gas centralized treatment method has the advantages that the medium coal group is a close-distance coal layer group which is not mined, each coal layer has high gas content and large gas pressure and has outstanding danger, and when the top or bottom coal layer of the medium coal group cannot be subjected to pressure relief protection through coal layer mining of the upper and lower coal groups, the first mining layer is selected by combining the development range of a gas fracture channel on the basis of the spatial effect of coal layer mining fracture evolution and the gas migration rule, the mining influence causes the top and bottom plate rock layers of each coal layer to move, deform and crack and generate fractures, the pressure relief and permeability increase effect is generated, the release of gas of each protected layer of the medium coal group is accelerated, and the pressure relief is performed on the original stress area.
Before a stoping roadway of a first mining surface of a middle coal group is tunneled, a gas centralized control roadway is arranged at the lower part of the middle coal group, and coal roadway strip gas extraction is carried out on a stoping roadway tunneling area through a construction layer-crossing long drill hole, so that outburst danger during tunneling is eliminated; and meanwhile, constructing a layer-crossing long borehole in each coal seam in the first mining layer and the pressure relief area thereof, and extracting coal seam gas in the pressure relief range of each coal seam and pressure relief gas during the stoping period, so that the pressure relief gas of a protected layer is intercepted to the maximum extent and gushes out. The method has the advantages of centralized control of close-distance coal seam group gas, full utilization of gas control space, long drainage time, wide range and the like, ensures the safe production of coal mines and finally realizes the co-mining of coal and gas.
Drawings
FIG. 1 is a diagram of the development range of gas fracture channels of the first face of a medium coal group;
FIG. 2 is a drawing of the first mining face stoping roadway coal roadway stripe gas extraction of the invention;
FIG. 3 is a centralized gas extraction diagram of the first mining surface of the medium coal group and the coal seam group in the pressure relief area;
FIG. 4 is a top gas concentrated extraction view of the first mining face of the present invention;
in the figure: 1: coal seam No. 1, 2: coal seam No. 2, 3: coal seam No. 3, 4: coal seam No. 4, 5: coal seam No. 5, 6: coal seam No. 6, 7: coal seam No. 7, 8: coal seam No. 8, 9: coal seam No. 9, 10: first mining face return airway, 11: first mining face haulage roadway, 12: gas centralized control lane one, 13: and (5) gas centralized treatment lane II and 14: first mining face gas fracture channel development range, 15: drilling a layer through long hole I, 16: and (5) layer-penetrating long drilling holes II and 17: pre-gas extraction range of air return lane strips, 18: and (5) pre-pumping the gas in the transportation lane.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings.
Example 1: a centralized gas treatment method for coal groups in close-distance coal seam groups comprises the following steps:
firstly, a middle coal group in a close-distance coal bed group is not mined, coal beds mined by an upper coal group and a lower coal group cannot perform pressure relief protection on coal beds at the top and the bottom of the middle coal group, and the pressure relief protection range covers other coal beds capable of being mined after the first mining layer is mined according to the gas parameters and the outburst danger degree of each coal bed of the middle coal group and the development range of a gas emission channel formed by the movement, deformation and fracture of rock strata at the top and the bottom of each coal bed influenced by the mining of the first mining layer;
secondly, arranging a first mining surface in the first mining layer, determining a stoping roadway of the first mining surface, and arranging a gas centralized control roadway according to the thickness of each coal seam, the interval of the layers, the drilling construction difficulty and the control range;
thirdly, constructing the control roadway by adopting a high-power drilling machine, ensuring that the pre-pumping range of the drilled hole covers the stoping roadway, the stoping area and the adjacent layer pressure relief area, and performing centralized extraction of coal roadway stripe gas and pressure relief gas;
fourthly, conducting construction layer-penetrating long drilling in the gas centralized control roadway, pre-pumping gas strips on two roadway strips on the first mining surface of the protective layer, and continuing drilling after the drilling holes penetrate through the first mining layer until all coal seams on the upper part of the medium coal group are penetrated, so that the gas content and the gas pressure of the coal seams in the tunneling area of the first mining surface stoping roadway are reduced, and the outburst danger is eliminated;
and fifthly, during the heading period of the first mining face stoping roadway, constructing the cross-layer drilling hole to pre-pump the gas of each coal bed in the stoping area of the first mining face of the medium coal group and the pressure relief area thereof, and reducing the gas treatment engineering quantity during the stoping period.
Embodiments of the invention are further described below with reference to the accompanying drawings:
as shown in fig. 1 and 2, No. 1, 2, 3, 4, 5, 6, 7, 8, and 9 coal seams of the coal groups in the close-distance coal seam group are not mined, and according to gas parameters and outburst risk degrees of each coal seam of the medium coal group, and a development range of a gas emission channel formed by movement, deformation, and fracture of a top floor rock stratum of each coal seam under the influence of mining of a first mining layer, a pressure relief protection range 14 after mining of the first mining layer is ensured to cover other mineable coal seams, and the coal seam 6 is determined to be the first mining layer of the medium coal group. And arranging a first mining face air return roadway 10 and a first mining face transport roadway 11, and constructing a first gas centralized control roadway 12 and a second gas centralized control roadway 13 at proper positions of the lower part of the medium coal group according to a return air roadway stripe gas pre-pumping range 17 and a transport roadway stripe gas pre-pumping range 18.
A high-power drilling machine is matched with a drilling inclinometer to ensure the control range of drilling. Constructing layer-penetrating long drill holes 15-3, 15-4, 15-5, 15-6, 15-7 and 15-8 in a first gas centralized treatment roadway 12, and pre-pumping coal roadway strip gas during tunneling of a first mining face return air roadway 10; and pre-pumping coal roadway stripe gas during the tunneling period of the first mining face transport roadway 11 through constructing layer-penetrating long drill holes 16-1, 16-2, 16-3, 16-4, 16-5, 16-6 and 16-7 in the gas centralized control roadway two 13. The control range is 15m on each side of the roadway contour line, the distance between the drill holes in the first mining layer 6 is 5-8m, and the drilling is continued after the drill holes penetrate the first mining layer until all coal seams on the upper part of the medium coal group are penetrated.
As shown in figure 3, through the first 12 construction cross-layer drill holes 15-1 and 15-2 of the gas centralized control roadway, the second 13 construction cross-layer drill holes 16-8, 16-9, 16-10, 16-11, 16-12, 16-13, 16-14, 16-15, 16-16, 16-17 and 16-18 of the gas centralized control roadway, gas in a first extraction face extraction area and other coal seam pressure relief areas of a medium coal group is pre-extracted.
As shown in fig. 4, through the construction of the cross-layer drill holes 15-9, 15-10, 15-11, 15-12, 15-13, 15-14, 15-15, 15-16, 15-17 and 15-18 through the first gas centralized control roadway 12, the gas of each coal seam on the upper section of the first mining face of the medium coal group is pre-pumped, and the gas control engineering quantity during the mining of the upper section of the medium coal group is reduced.
The gas centralized treatment method has the advantages that the medium coal group is a short-distance coal layer group which is not mined yet, each coal layer has high gas content and large gas pressure and has outstanding dangerousness, and when the pressure relief protection can not be performed on the coal layers at the top or the bottom of the medium coal group through the coal layer mining of the upper coal group and the lower coal group, the first mining layer is selected by combining the development range of a gas fracture channel based on the space effect of the mining fracture evolution of the coal layers and the gas migration rule, the mining influence of the first mining layer enables the rock layers of the top and the bottom of each coal layer to move, deform and crack and generate fractures, the pressure relief and permeability improvement effect is generated, the gas release of each protected layer of the medium coal group is accelerated.
Before a stoping roadway of a first mining surface of a middle coal group is tunneled, a gas centralized control roadway is arranged at the lower part of the middle coal group, and coal roadway strip gas extraction is carried out on a stoping roadway tunneling area through a construction layer-crossing long drill hole, so that outburst danger during tunneling is eliminated; and meanwhile, constructing a layer-crossing long borehole in each coal seam in the first mining layer and the pressure relief area thereof, and extracting coal seam gas in the pressure relief range of each coal seam and pressure relief gas during the stoping period, so that the pressure relief gas of a protected layer is intercepted to the maximum extent and gushes out. The method has the advantages of centralized control of close-distance coal seam group gas, full utilization of gas control space, long drainage time, wide range and the like, ensures the safe production of coal mines and finally realizes the co-mining of coal and gas.
The invention relates to a centralized gas control method for coal groups in close-range coal seam groups, which is suitable for centralized gas control of a coal group stoping roadway and a first stoping surface (protective layer) entering the close-range coal seam group for the first time, and the gas of each coal seam of the medium coal group in the first stoping surface (protective layer) and a pressure relief range of the first stoping surface (protective layer) is pumped and discharged in a centralized manner, so that a gas control space is fully utilized, the gas control efficiency is improved, the method has the characteristics of high drilling utilization rate and wide gas control range, the tunneling and outburst elimination of the first stoping surface (protective layer) stoping roadway are realized, the pressure relief gas emission amount of the protected coal.
The present invention is not described in detail, but is known to those skilled in the art. Finally, the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all of them should be covered in the claims of the present invention.
Claims (3)
1. A method for centralized gas control of coal groups in close-distance coal seam groups is characterized by comprising the following steps: the method comprises the following steps:
firstly, a middle coal group in a close-distance coal bed group is not mined, coal beds mined by an upper coal group and a lower coal group cannot perform pressure relief protection on coal beds at the top and the bottom of the middle coal group, and the pressure relief protection range covers other coal beds capable of being mined after the first mining layer is mined according to the gas parameters and the outburst danger degree of each coal bed of the middle coal group and the development range of a gas emission channel formed by the movement, deformation and fracture of rock strata at the top and the bottom of each coal bed influenced by the mining of the first mining layer;
secondly, arranging a first mining surface in the first mining layer, determining a stoping roadway of the first mining surface, and arranging a gas centralized control roadway according to the thickness of each coal seam, the interval of the layers, the drilling construction difficulty and the control range;
thirdly, constructing the control roadway by adopting a high-power drilling machine, ensuring that the pre-pumping range of the drilled hole covers the stoping roadway, the stoping area and the adjacent layer pressure relief area, and performing centralized extraction of coal roadway stripe gas and pressure relief gas;
fourthly, conducting construction layer-penetrating long drilling in the gas centralized control roadway, pre-pumping gas strips on two roadway strips on the first mining surface of the protective layer, and continuing drilling after the drilling holes penetrate through the first mining layer until all coal seams on the upper part of the medium coal group are penetrated, so that the gas content and the gas pressure of the coal seams in the tunneling area of the first mining surface stoping roadway are reduced, and the outburst danger is eliminated;
and fifthly, during the heading period of the first mining face stoping roadway, constructing the cross-layer drilling hole to pre-pump the gas of each coal bed in the stoping area of the first mining face of the medium coal group and the pressure relief area thereof, and reducing the gas treatment engineering quantity during the stoping period.
2. The method for centralized gas control of coal groups in a close-range coal seam group according to claim 1, characterized in that: and the distance between the drill holes in the first mining layer is 5-8m, and the drill holes continue to drill after penetrating the first mining layer until all coal seams at the upper part of the middle coal group are penetrated.
3. The method for centralized gas control of coal groups in a close-range coal seam group according to claim 1, characterized in that: the control range is 15m on each side of the roadway contour line.
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| CN112832850A (en) * | 2021-03-26 | 2021-05-25 | 河南理工大学 | Three-dimensional construction method for semi-permanent gas extraction channel by using hole instead of roadway |
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| CN114483163A (en) * | 2022-02-11 | 2022-05-13 | 中国矿业大学 | Gas extraction method |
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Application publication date: 20210226 |