CN110685734B - Panel gas treatment method based on partition step-by-step increasing tree-shaped directional long drilling - Google Patents

Panel gas treatment method based on partition step-by-step increasing tree-shaped directional long drilling Download PDF

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CN110685734B
CN110685734B CN201911018899.9A CN201911018899A CN110685734B CN 110685734 B CN110685734 B CN 110685734B CN 201911018899 A CN201911018899 A CN 201911018899A CN 110685734 B CN110685734 B CN 110685734B
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hole
tree
directional long
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drill
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CN110685734A (en
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李泉新
董书宁
石智军
方俊
许超
刘桂芹
王鲜
姜磊
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Xian Research Institute Co Ltd of CCTEG
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    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21FSAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
    • E21F7/00Methods or devices for drawing- off gases with or without subsequent use of the gas for any purpose

Abstract

A panel gas treatment method based on a tree-shaped directional long drill hole with gradually increased partitions is characterized in that the tree-shaped directional long drill hole is arranged along the length direction of a panel, and a main hole of the tree-shaped directional long drill hole is used for completely covering the whole panel; arranging plane branch holes in a partition step-by-step increasing mode, covering plane extraction blind areas caused by the control precision of drilling tracks by using the plane branch holes, and encrypting the drilled holes; covering a profile extraction blind area caused by the gangue inclusion layer by using the upper branch hole and the lower branch hole; therefore, the invention can carry out integral advanced pre-extraction treatment on the gas in the panel area, and can also carry out extraction treatment on the extracted pressure-relief gas during coal seam stoping, solves the problems that the progressive extraction efficiency is low, extraction blind areas are easy to cause due to the control precision of the drilling track and a gangue clamping layer, the extraction of drilling holes arranged at equal intervals is unbalanced, and the like, realizes the balanced integral extraction without blind areas in the panel area, improves the treatment efficiency and effect of the gas in a coal mine, and ensures the safe and efficient mining of the mine.

Description

Panel gas treatment method based on partition step-by-step increasing tree-shaped directional long drilling
Technical Field
The invention relates to the technical field of coal mine gas treatment, in particular to a panel gas treatment method based on zoning and gradual increasing tree-shaped directional long drilling.
Background
The gas accident is a disaster type with the largest number of coal mines and the largest harm. In order to avoid gas accidents, coal seam gas needs to be pre-extracted in advance, so that the coal seam gas is reduced to be within an allowable range; and the pressure relief gas is extracted along with mining in the working face coal seam stoping process, so that the production safety of the coal mine is guaranteed.
At present, a coal mine mainly adopts a progressive gas treatment mode, and the mode is detailed in Chinese patents with application numbers of 201010252165.X and publication numbers of CN101915118A, and the specific principle is as follows: arranging a plurality of stope faces in the panel area, and constructing long drill holes in the adjacent working face area in advance in the crossheading at the outer side of the stope face, wherein the drill hole length penetrates through the outer side of the next stope face to reserve a roadway influence area; after gas extraction is carried out by utilizing the drill hole, the current stope face is exploited, and the outer side crossheading of the next stope face is tunneled; and then, continuously carrying out construction long drilling in the outer crossheading towards the next adjacent stope face area, and carrying out progressive cyclic forward propulsion, thereby realizing normal succession of pumping, digging and mining and improving the production safety of the coal mine.
The method has the following defects: firstly, the gas in the panel area needs to be treated step by adopting a progressive extraction mode of a stope face, the integral advanced treatment of the gas in the panel area cannot be realized, and the efficiency is low; track control errors exist in gas extraction drilling construction, the drilling track control errors are accumulated in an incremental mode along with the increase of the hole depth, gas extraction drilling holes are uniformly arranged at equal intervals, when the drilling holes reach a certain depth, the drilling track errors are larger than the effective extraction radius of the drilling holes, and a plane extraction blind area is easy to generate; a coal seam generally contains a gangue layer, and the gas permeability of the gangue layer is poor, so that the gas extraction of a drilled hole can be blocked, and a profile extraction blind area is easy to cause; when drilling construction is carried out, construction is generally carried out from near to far along the length direction of the stope face, when a coal seam is stoped, coal is generally mined from far to near along the length direction of the stope face, namely the drilling construction direction is not consistent with the stope direction of the coal seam, the arrangement number of drill holes is the same, the construction time of the drill holes at the far position of the stope face is late, the abandonment time is early, so that gas extraction in the stope face is unbalanced, and the gas extraction time needs to be prolonged in order to ensure that the whole gas extraction of the stope face reaches the standard; fifthly, the gas extraction directional drilling hole is vertical to the roadway to be excavated, after the roadway is excavated, the drilling hole is exposed to failure, and the utilization time is short; sixthly, the drill hole is damaged when the coal seam is stoped, so that the drill hole can only carry out gas pre-extraction, and the problem of pressure relief gas control when the working face is stoped cannot be solved; and the drill holes are generally arranged along the coal seam, and are mostly drilled downwards, water is easily accumulated in the drill holes, a gas extraction channel is blocked, and the extraction effect is influenced.
Therefore, in view of the above-mentioned drawbacks, the designer of the present invention, through careful research and design, integrates experience and results of related industries for many years, and researches and designs a panel gas control method based on partition gradually-increasing tree-shaped directional long drill holes to overcome the above-mentioned drawbacks.
Disclosure of Invention
The invention aims to provide a panel gas treatment method based on a tree-shaped directional long drill hole with gradually increased partitions, which can solve the technical problems that the panel gas treatment efficiency is low, plane and section extraction blind areas are easy to exist, extraction is unbalanced, the utilization rate of the drill hole is low, the blockage is easy and the like in the existing coal mine underground progressive gas treatment mode.
In order to achieve the purpose, the invention discloses a panel gas treatment method based on partition gradual increasing tree-shaped directional long drilling holes, which is characterized by comprising the following working steps of:
the method comprises the following steps: setting a panel area and a stope face, and determining the width of the panel area in a direction perpendicular to the coal seam direction according to the mine boundary; determining the length of the panel in the direction parallel to the trend direction of the coal bed according to the length of the tree-shaped directional long drill hole; a plurality of stope faces are arranged in the panel area and parallel to the direction of the coal seam;
step two: performing main roadway excavation and drill site arrangement on the panel area, excavating the main roadway of the panel area at the edge of the panel area along the width direction of the panel area, and arranging a plurality of drill sites at intervals in the main roadway;
step three: constructing tree-shaped directional long drill holes in the direction parallel to the stope face in each drill field, wherein each tree-shaped directional long drill hole covers the whole panel area, and a hole-protecting sieve tube is arranged in each drill hole;
step four: pre-extracting the panel gas, namely pre-extracting the gas by utilizing a tree-shaped directional long drill hole;
step five: and (3) tunneling a stope face roadway and stoping a coal seam, after the gas extraction of the panel reaches the standard, parallel to the underground directional long drill hole, tunneling a coal roadway from the main roadway to the stope face, and after the stope face is closed, performing stope face coal seam mining from far to near.
Wherein: further comprises the sixth step: and (3) extracting and stoping the mining gas, wherein in the process of mining the coal seam of the working face, the tree-shaped directional long drill holes are used for continuously extracting the coal seam gas in the area which is not mined, and extracting the mining pressure relief gas in the mined area until the coal seam of the stoping face in the panel area is completely mined.
Wherein: the width of the disc area does not exceed the mine boundary, and the length of the disc area is equal to or less than the length of the tree-shaped directional long drill hole minus the advance distance.
Wherein: the lead distance is 15-20 m.
Wherein: the number of the drilling sites is the same as that of the stope working faces, and each drilling site is respectively positioned at the middle position corresponding to the width direction of the stope working face.
Wherein: the tree-shaped directional long drill holes are arranged in a cluster type hole group by taking a drill site as a unit, the distance between the drill holes is selected according to the air permeability coefficient of the coal seam, and when the air permeability coefficient is more than or equal to 10m2D, when the pressure is Mpa.d, the distance d between the drill holes is 10 m; when the air permeability coefficient is more than or equal to 0.1m2When the pressure is Mpa.d, the distance d between the drill holes is 5-10 m; when the air permeability coefficient is less than or equal to 0.1m2D is Mpa.d, the distance d between the drill holes is 3-5 m.
Wherein: the tree-shaped directional long drilling holes are arranged in a tree shape on the plane and comprise main holes, parallel branch holes which are arranged outwards at intervals in sequence are arranged on two sides of each main hole, the distance between each parallel branch hole arranged on each main hole and the distance between each two parallel branch holes arranged in sequence are the same as the drilling distance, and the number of the parallel branch holes gradually increases along with the increase of the hole depth.
Wherein: calculating the partition length of the tree-shaped directional long drill hole along the axial direction based on the following formula (1):
in the formula: l is the partition length in m; d is the tree-shaped directional long drilling hole distance, and the unit is m; t is the control precision of the drilling track and is dimensionless.
Wherein: calculating the partition number of the tree-shaped directional long drill hole along the axial direction based on the following formula (2):
in the formula: n is the number of partitions and is dimensionless; l is the partition length in m; l is the length of the tree-shaped directional long drill hole and the unit is m;
calculating the number of parallel branch holes of different partitions based on the following formula (3):
N=2(i-1)
in the formula: n is the number of parallel branch holes of the ith subarea and is a natural number; i is a partition number, i is not more than n and is a positive integer.
Wherein: the tree-shaped directional long drilling hole profile is further provided with an upper layer branch hole and a lower layer branch hole, the upper layer branch hole is located at the upper portion of the main hole, the lower layer branch hole is located at the lower portion of the main hole, and the upper layer branch hole and the lower layer branch hole penetrate through a gangue layer in the coal layer so that a layered gas extraction blind area in the panel area can be avoided.
According to the content, the panel gas treatment method based on the zone gradual increasing tree-shaped directional long drilling hole has the following effects:
1. the whole panel is covered by the tree-shaped directional long drill holes in advance, so that the overall control of the gas in the panel is realized, and the gas control efficiency of the panel is improved.
2. The tree-shaped directional long drill holes are arranged in a partition step-by-step increasing mode, and the plane extraction blind areas caused by the track control deviation are covered by gradually increased plane branch holes; and the upper-layer branch hole and the lower-layer branch hole are used for covering the profile extraction blind area caused by the gangue inclusion layer, so that the non-blind area extraction is realized.
3. The number of the plane branch holes of the tree-shaped directional long drill holes is more and more from near to far along the length direction of the working face, the adjacent drill holes are mutually crossed and overlapped, the drill hole density is gradually increased, the distribution condition of the drill hole density is opposite to the extraction direction of the coal seam of the working face, namely the earlier the extraction is, the shorter the extraction time is, the more dense the drill hole arrangement of the area is, and the later the extraction time is, the more sparse the drill hole arrangement of the area is, so that the balanced extraction is realized.
4. The tree-shaped directional long drill holes are arranged in parallel to the stope face and the roadway, cannot be cut off by the heading of the stope face, and are long in extraction time and high in utilization efficiency.
5. The method can not only perform advanced pre-extraction on the gas of the stope face in the panel area, but also continue to perform gas extraction on the unexplored coal seam in the stope process, and extract the mining pressure relief gas, and has the advantages of one hole, multiple purposes and long extraction time.
6. The tree-shaped directional long drill hole is parallel to the coal seam trend, the drill hole is nearly horizontal, water is not accumulated in the hole easily, and the sieve tube protective hole is arranged, so that the gas extraction channel is prevented from being blocked.
The details of the present invention can be obtained from the following description and the attached drawings.
Drawings
FIG. 1 is a schematic diagram showing the principle of the panel gas treatment method based on the zone gradual-increasing tree-shaped directional long drilling hole of the invention
FIG. 2 is a schematic diagram showing the principle of the gas control of the panel by using tree-shaped directional long drilling holes in the coal seam mining process of the present invention
FIG. 3 is a schematic view showing the planar structure of the tree-shaped directional long borehole of the present invention
FIG. 4 is a schematic view showing the cross-sectional structure of the tree-shaped directional long bore hole of the present invention
Reference numerals:
the mining area comprises a panel 1, a tree-shaped directional long drill hole 2, a stope face 3, a main roadway 4, a drill site 5, a coal roadway 6, an unexplored area 7, a mined area 8, a main hole 9, parallel branch holes 10, an upper layer branch hole 11, a lower layer branch hole 12 and a gangue clamping layer 13.
Detailed Description
Referring to fig. 1 and 2, the panel gas treatment method based on the zone gradual increasing tree-shaped directional long drilling hole is shown.
The panel gas treatment method based on the zoning step-by-step increasing tree-shaped directional long drilling hole comprises the following working steps:
the method comprises the following steps: setting a panel area and a stope face, specifically, determining the width of the panel area 1 in a direction perpendicular to the coal seam trend according to the mine boundary; determining the length of the disc area 1 in the direction parallel to the trend direction of the coal bed according to the length of the tree-shaped directional long drill hole 2; a plurality of stope faces 3 are arranged in the panel 1 in parallel with the running direction of the coal seam.
Step two: and performing main roadway tunneling and drill site arrangement on the panel area. A main roadway 4 of the disc area 1 is excavated at the edge of the disc area 1 along the width direction of the disc area 1, and a plurality of drill sites 5 are arranged at intervals in the main roadway 4.
Step three: tree-shaped directional long drilling is respectively carried out in each drilling field 5. Tree-shaped directional long drill holes 2 are constructed in the directions parallel to the stope face 3 in each drill site 5, each tree-shaped directional long drill hole 2 covers the whole panel area 1, and a hole-protecting sieve tube is arranged in each drill hole.
Step four: and pre-extracting the gas in the panel area by utilizing the tree-shaped directional long drill hole 2.
Step five: and (4) roadway excavation and coal seam recovery of a recovery working face. After the gas extraction of the panel area 1 reaches the standard, the panel area is parallel to the underground directional long drill hole, a coal roadway 6 is tunneled from a main roadway 4 to a stope face 3, and after the stope face 3 is closed, the stope face 3 coal seam mining is carried out from far to near. The mining working face is rectangular, the drilling site is positioned at the near end in the length direction, and tree-shaped directional long drill holes are arranged along the length direction of the mining working face and are constructed from the near end to the far end; when the coal seam is mined, the coal mining machine is arranged along the width direction of the stoping working face, the coal cutting width is equal to the width of the stoping working face every time, the coal cutting length is not necessarily long, and the coal is stoped from the far end to the near end along the length direction of the working face until the coal cutting line is reached. The coal seam stoping process is the same as the coal mining process of the existing coal mining process.
Step six: and extracting mining gas. And in the process of mining the coal bed of the stope face 3, continuously extracting coal bed gas in the unexplored area 7 by using the tree-shaped directional long drill holes 2, and extracting mining pressure relief gas in the mined area 8 until the coal bed of the stope face 3 in the panel area 1 is completely mined. According to the fifth step and the figure 2, the tree-shaped directional long drill holes are used for gas extraction in the drill site, and the arrangement direction of the tree-shaped directional long drill holes is just opposite to the coal seam mining direction. When the coal seam is stoped, a large amount of gas can be released from the coal seam cut by the coal mining machine due to the pressure relief effect, and is accumulated in a large amount on a coal mining operation site, and at the moment, the bottom of the tree-shaped directional long drill hole is always positioned on the coal mining operation site, so that the accumulated mining pressure relief gas can be extracted; and other parts of the tree-shaped directional long drill hole are still positioned in the non-recovery area of the working face, and the gas in the non-recovery area can be continuously extracted.
Wherein the width of the panel 1 does not exceed the mine boundary.
Wherein the length of the disc area 1 is equal to or less than the length of the tree-shaped directional long drill hole 2 minus a lead distance, preferably, the lead distance is 15-20 m.
The number of the drill sites 5 is the same as that of the stope faces 3, and each drill site 5 is located at the middle position corresponding to the width direction of the stope face 3.
Particularly, the tree-shaped directional long drill holes 2 are arranged in a cluster type hole group by taking a drill site 5 as a unit, the distance between the drill holes is selected according to the permeability coefficient of the coal seam, and when the permeability coefficient is more than or equal to 10m2D, when the pressure is Mpa.d, the distance d between the drill holes is 10 m; when the air permeability coefficient is more than or equal to 0.1m2When the pressure is Mpa.d, the distance d between the drill holes is 5-10 m; when the air permeability coefficient is less than or equal to 0.1m2D is Mpa.d, the distance d between the drill holes is 3-5 m.
Referring to fig. 3, the tree-shaped directional long drill holes 2 are arranged in a tree shape on a plane and include a main hole 9, parallel branch holes 10 are formed in two sides of the main hole 9, the parallel branch holes 10 are sequentially arranged outward at intervals, the distance between the parallel branch holes 10 formed in the main hole 9 and the main hole 9, and the distance between the parallel branch holes 10 is the same as the drill hole distance, and the number of the parallel branch holes 10 increases gradually in different zones along with the increase of the hole depth.
Wherein the length of the partition of the tree-like directional long bore 2 in the axial direction is calculated based on the following formula (1):
in the formula: l is the partition length in m; d is the distance between the tree-shaped directional long drill holes 2, and the unit is m; t is the control precision of the drilling track and is dimensionless.
Wherein the number of divisions of the tree-like directional long drill hole 2 in the axial direction is calculated based on the following formula (2):
in the formula: n is the number of partitions and is dimensionless; l is the partition length in m; l is the length of the tree-like directional long borehole 2 in m.
The number of parallel branch holes 10 for different partitions is calculated based on the following formula (3):
N=2(i-1)
in the formula: n is the number of parallel branch holes 10 of the ith subarea, and N is a natural number; i is a partition number, i is not more than n and is a positive integer.
Referring to fig. 4, the cross section of the tree-shaped directional long drill hole 2 is further provided with an upper layer branch hole 11 and a lower layer branch hole 12, wherein the upper layer branch hole 11 is located at the upper part of the main hole 9, the lower layer branch hole 12 is located at the lower part of the main hole 9, and the upper layer branch hole 11 and the lower layer branch hole 12 penetrate through a gangue layer 13 in a coal layer, so that a layered gas extraction blind area in a panel area can be avoided. The upper and lower branch holes 11 and 12 are branch holes arranged on a vertical plane and are mainly used for covering extraction blind areas caused by gangue inclusion layers. The gangue clamping layer and the directional drilling holes are located in a coal bed, on a vertical plane, the gangue clamping layer is arranged above a main hole, or an upper layer branch hole and a lower layer branch hole which are respectively constructed from the main hole are arranged below the main hole, although each gangue clamping layer can not be ensured to pass, one gangue clamping layer must pass through the other gangue clamping layer. In actual construction, a plurality of branch holes of the upper layer and the lower layer can be arranged to ensure that all the gangue layers are penetrated.
Therefore, the invention has the advantages that:
1. the whole panel is covered by the tree-shaped directional long drill holes in advance, so that the overall control of the gas in the panel is realized, and the gas control efficiency of the panel is improved.
2. The tree-shaped directional long drill holes are arranged in a partition step-by-step increasing mode, and the plane extraction blind areas caused by the track control deviation are covered by gradually increased plane branch holes; and the upper-layer branch hole and the lower-layer branch hole are used for covering the profile extraction blind area caused by the gangue inclusion layer, so that the non-blind area extraction is realized.
3. The number of the plane branch holes of the tree-shaped directional long drill holes is more and more from near to far along the length direction of the working face, the adjacent drill holes are mutually crossed and overlapped, the drill hole density is gradually increased, the distribution condition of the drill hole density is opposite to the extraction direction of the coal seam of the working face, namely the earlier the extraction is, the shorter the extraction time is, the more dense the drill hole arrangement of the area is, and the later the extraction time is, the more sparse the drill hole arrangement of the area is, so that the balanced extraction is realized.
4. The tree-shaped directional long drill holes are arranged in parallel to the stope face and the roadway, cannot be cut off by the heading of the stope face, and are long in extraction time and high in utilization efficiency.
5. The method can not only perform advanced pre-extraction on the gas of the stope face in the panel area, but also continue to perform gas extraction on the unexplored coal seam in the stope process, and extract the mining pressure relief gas, and has the advantages of one hole, multiple purposes and long extraction time.
6. The tree-shaped directional long drill hole is parallel to the coal seam trend, the drill hole is nearly horizontal, water is not accumulated in the hole easily, and the sieve tube protective hole is arranged, so that the gas extraction channel is prevented from being blocked.
It should be apparent that the foregoing description and illustrations are by way of example only and are not intended to limit the present disclosure, application or uses. While embodiments have been described in the embodiments and depicted in the drawings, the present invention is not limited to the particular examples illustrated by the drawings and described in the embodiments as the best mode presently contemplated for carrying out the teachings of the present invention, and the scope of the present invention will include any embodiments falling within the foregoing description and the appended claims.

Claims (7)

1. A panel gas treatment method based on partition gradual increasing tree-shaped directional long drilling is characterized by comprising the following working steps:
the method comprises the following steps: setting a panel area and a stope face, and determining the width of the panel area in a direction perpendicular to the coal seam direction according to the mine boundary; determining the length of the panel in the direction parallel to the trend direction of the coal bed according to the length of the tree-shaped directional long drill hole; a plurality of stope faces are arranged in the panel area and parallel to the direction of the coal seam;
step two: performing main roadway excavation and drill site arrangement on the panel area, excavating the main roadway of the panel area at the edge of the panel area along the width direction of the panel area, and arranging a plurality of drill sites at intervals in the main roadway;
step three: constructing tree-shaped directional long drill holes in the direction parallel to the stope face in each drill field, wherein each tree-shaped directional long drill hole covers the whole panel area, and a hole-protecting sieve tube is arranged in each drill hole;
step four: pre-extracting the panel gas, namely pre-extracting the gas by utilizing a tree-shaped directional long drill hole;
step five: tunneling a stope face roadway and stoping a coal seam, after the gas extraction of the panel reaches the standard, parallel to the underground directional long drill hole, tunneling a coal roadway from a main roadway to a stope face, and after the stope face is closed, performing stope face coal seam mining from far to near;
the tree-shaped directional long drill hole is arranged in a tree shape on a plane and comprises a main hole, parallel branch holes are arranged on two sides of the main hole and are sequentially arranged outwards at intervals, the distance between the parallel branch holes arranged on the main hole and the distance between the parallel branch holes arranged in sequence are the same as the drill hole distance, the number of the parallel branch holes gradually increases along with the increase of the hole depth, and the partition length of the tree-shaped directional long drill hole along the axial direction is calculated based on the following formula (1):
in the formula: l is the partition length in m; d is the tree-shaped directional long drilling hole distance, and the unit is m; t is the control precision of the drilling track and is dimensionless;
calculating the partition number of the tree-shaped directional long drill hole along the axial direction based on the following formula (2):
in the formula: n is the number of partitions and is dimensionless; l is the partition length in m; l is the length of the tree-shaped directional long drill hole and the unit is m;
calculating the number of parallel branch holes of different partitions based on the following formula (3):
N=2(i-1)
in the formula: n is the number of parallel branch holes of the ith subarea and is a natural number; i is a partition number, i is not more than n and is a positive integer.
2. The disk area gas control method based on the zone gradual-increase tree-shaped directional long drilling hole as claimed in claim 1, characterized in that: further comprises the sixth step: and (3) extracting the coal seam gas, in the process of extracting the coal seam of the stope face, continuously extracting the coal seam gas in the unexploited area by utilizing the tree-shaped directional long drill hole, and extracting the mining pressure relief gas in the exploited area until the coal seam of the stope face in the panel area is completely exploited.
3. The disk area gas control method based on the zone gradual-increase tree-shaped directional long drilling hole as claimed in claim 1, characterized in that: the width of the disc area does not exceed the mine boundary, and the length of the disc area is equal to or less than the length of the tree-shaped directional long drill hole minus the advance distance.
4. The disk area gas control method based on the zone gradual-increase tree-shaped directional long drill hole as claimed in claim 3, characterized in that: the lead distance is 15-20 m.
5. The disk area gas control method based on the zone gradual-increase tree-shaped directional long drilling hole as claimed in claim 1, characterized in that: the number of the drilling sites is the same as that of the stope working faces, and each drilling site is respectively positioned at the middle position corresponding to the width direction of the stope working face.
6. The disk area gas control method based on the zone gradual-increase tree-shaped directional long drilling hole as claimed in claim 1, characterized in that: the tree-shaped directional long drill holes are arranged in a cluster type hole group by taking a drill site as a unit, the distance between the drill holes is selected according to the air permeability coefficient of the coal seam, and when the air permeability coefficient is more than or equal to 10m2D, when the pressure is Mpa.d, the distance d between the drill holes is 10 m; when the air permeability coefficient is more than or equal to 0.1m2When the pressure is Mpa.d, the distance d between the drill holes is 5-10 m; when the air permeability coefficient is less than or equal to 0.1m2D is Mpa.d, the distance d between the drill holes is 3-5 m.
7. The disk area gas control method based on the zone gradual-increase tree-shaped directional long drilling hole as claimed in claim 1, characterized in that: the tree-shaped directional long drilling hole profile is further provided with an upper layer branch hole and a lower layer branch hole, the upper layer branch hole is located at the upper portion of the main hole, the lower layer branch hole is located at the lower portion of the main hole, and the upper layer branch hole and the lower layer branch hole penetrate through a gangue layer in the coal layer so that a layered gas extraction blind area in the panel area can be avoided.
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