CN113982474A - Underground coal mine three-dimensional multidimensional gas treatment method - Google Patents

Underground coal mine three-dimensional multidimensional gas treatment method Download PDF

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Publication number
CN113982474A
CN113982474A CN202111210597.9A CN202111210597A CN113982474A CN 113982474 A CN113982474 A CN 113982474A CN 202111210597 A CN202111210597 A CN 202111210597A CN 113982474 A CN113982474 A CN 113982474A
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drilling
hole
coal seam
drill
pinnate
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CN202111210597.9A
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CN113982474B (en
Inventor
魏民涛
罗中正
沈润生
张格强
秦波涛
程子华
高远
陈洪涛
高向阳
唐俊
杨洪伟
蒋剑飞
司贤让
陈严
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Henan Shenhuo Coal & Power Co ltd
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Henan Shenhuo Coal & Power Co ltd
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    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B7/00—Special methods or apparatus for drilling
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21B—EARTH DRILLING, e.g. DEEP 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. optimizing the spacing of wells
    • E21B43/305—Specific pattern of wells, e.g. optimizing the spacing of wells comprising at least one inclined or horizontal well
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21B—EARTH DRILLING, e.g. DEEP 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 DRILLING; MINING
    • E21B—EARTH DRILLING, e.g. DEEP 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
    • E21B7/06—Deflecting the direction of boreholes
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B7/00—Special methods or apparatus for drilling
    • E21B7/28—Enlarging drilled holes, e.g. by counterboring
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH 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

Abstract

The invention discloses a coal mine underground three-dimensional multidimensional gas treatment method, which comprises the following steps: s1, arranging a floor rock roadway and a drilling machine below the coal seam; s2, operating the drilling machine to drill at an acute angle with the coal seam; s3, completing drilling of the straight section main hole; controlling the drilling direction to be gradually parallel to the coal seam direction, and continuing to drill; s4, placing a separation whipstock to enable the drill rod direction to gradually incline to the coal seam direction and drill at an acute angle with the coal seam; drilling into the coal seam roof continuously to complete the drilling of a pinnate directional branch hole; s5, adjusting the position of the separated whipstock, changing the drilling direction of the hole bottom motor, and completing the drilling of another pinnate directional branch hole at a symmetrical position; and S6, moving the whipstock to another group of preset hole opening positions, repeating for many times, and finally completing the three-dimensional directional gas extraction hole formed by the pairs of the pinnate directional branch holes. The invention combines the pinnate branch directional drilling with the cross-layer drilling and the bedding drilling, thereby realizing the three-dimensional gas control in the horizontal and vertical directions of the coal bed.

Description

Underground coal mine three-dimensional multidimensional gas treatment method
Technical Field
The invention relates to the field of mine gas treatment, in particular to a coal mine underground three-dimensional multidimensional gas treatment method.
Background
Coal accounts for about 60% of the primary energy consumption composition of China, and in the coming decades, the consumption pattern taking coal as main energy is expected not to change, but the coal mine safety problem, especially the gas problem, is still prominent and becomes one of the most main factors restricting the continuous development of the coal industry. The gas extraction is the most direct and effective method for controlling the mine gas, so that the emission quantity of the mine gas in a coal mine can be effectively reduced, gas disaster accidents can be prevented, the gas can be fully utilized as efficient and clean energy, and the pollution to the environment is reduced. Currently, gas extraction modes are mainly divided into roadway extraction, buried pipe extraction, borehole extraction and the like. The directional drilling is widely applied to the field of mine gas control due to the advantages of small construction amount, large shielding range, high directional precision, one-hole multi-branch and the like.
In the directional drilling process, the arrangement mode of the drill hole gradually matures, but the current commonly used arrangement mode of the main hole and the comb-shaped branch hole can be used for treating gas with a single longitudinal section, but the extraction effect in the horizontal direction is poor. In order to improve the gas extraction efficiency, the prior art can only improve the main hole arrangement density of directional drilling, but the method undoubtedly greatly increases the construction amount, and meanwhile, the method can also cause negative effects on the gas extraction effect of a single main hole, even influence the coal seam extraction progress and delay the working face extraction time. Due to the limitation of the current directional drilling technology, the comprehensive extraction work of the high-gas coal seam cannot be realized only by adopting directional drilling.
Therefore, aiming at the defects of the prior art, the invention provides a coal mine underground three-dimensional multidimensional gas treatment method.
Disclosure of Invention
The invention aims to solve the technical problem of the prior art and provides a coal mine underground three-dimensional multi-dimensional gas control method, which combines a pinnate branch directional drilling hole with a traditional cross-layer drilling hole and a traditional bedding drilling hole to realize three-dimensional gas extraction in the horizontal and vertical directions of a coal seam, improve the shielding range of a single directional main hole, reduce the construction amount, integrally improve the gas extraction efficiency and shorten the gas extraction standard reaching time.
In order to solve the technical problems, the invention adopts the technical scheme that:
a coal mine underground three-dimensional multidimensional gas treatment method is characterized in that: the method specifically comprises the following steps:
step 1, arranging a bottom plate rock roadway below a coal seam, and constructing and laying a drill site;
step 2, after the arrangement of the drilling field is finished, operating a drilling machine to drill into the floor rock stratum at an acute angle with the coal seam; the front section of the drilling main hole is a straight section drilling main hole, and the tapping work of the straight section drilling main hole is stopped after a certain distance is drilled;
step 3, after the tapping work of the straight section drilling main hole is stopped, operating a hole bottom motor to enable the drilling direction to be gradually parallel to the coal seam direction, continuing drilling until the tapping position of a group of preset branch holes farthest from a drilling field is reached, and completing the tapping work of the main hole of the deflecting section;
step 4, placing a separation whipstock at the position of a group of preset branch hole openings farthest from a drilling field, and drilling into the coal seam in an acute angle formed by the drilling direction of an operation hole bottom motor and the coal seam; drilling into the top plate of the coal seam after the coal seam is penetrated, and completing the drilling of a pinnate directional branch hole;
step 5, withdrawing the hole bottom motor from the inside of the pinnate directional branch hole to the main hole of the deflecting section, adjusting the position of the separated deflecting device, and changing the drilling direction of the hole bottom motor so that the drilling direction is symmetrical to the direction of the pinnate directional branch hole in the step 4 along the main hole of the deflecting section; drilling a deflecting drilling hole into the coal seam through a hole bottom motor; drilling into the top plate of the coal seam after the coal seam is penetrated, and completing the drilling of another pinnate directional branch hole at the symmetrical position;
step 6, withdrawing the hole bottom motor, moving the whipstock towards the direction of the drill site, moving the whipstock to a preset hole opening position adjacent to the pair of feather-shaped directional branch holes, and repeating the step 4 and the step 5 to complete the drilling of a second pair of feather-shaped directional branch holes;
and 7, repeating the step 6, and finally finishing a group of three-dimensional directional gas extraction holes formed by a plurality of pairs of pinnate directional branch holes.
As a further preferred aspect of the present invention, after completing drilling of the pinnate directional branch hole, drilling a cross-layer borehole by deflecting one side of the pinnate directional branch hole by a certain angle, and repeatedly drilling a hole for a plurality of times to form a row of radial cross-layer boreholes covering the coal seam above the floor rock roadway; and constructing a plurality of rows of cross-layer drill holes at intervals in the coal seam trend direction, and finally forming a cross-layer drill hole group covering the upper part of the bottom plate rock roadway.
Preferably, after the coal bed gas extraction reaches the standard and the working face air inlet and return roadway is arranged, bedding drill holes are formed in the coal roadway on the upper side of the coal bed; and drilling holes along the layer at an interval of 5-10 m.
Further preferably, the floor rock roadway and the drill site are arranged 20-30 m below the coal seam.
Further preferably, the acute angle formed by the drilling main hole and the coal seam is 5-10 degrees.
As a further preferable mode of the present invention, the drilling main hole includes a straight section drilling main hole and a deflecting section drilling main hole; reaming is needed after drilling the main hole; the hole diameter of the drilling main hole before hole expansion is 85-90 mm, and the hole diameter of the drilling main hole after hole expansion is 95-105 mm.
Preferably, the high-pressure rubber pipe is embedded in the main hole of the inclined section after hole expansion, so that subsequent drilling and hydraulic punching operations of the pinnate directional branch hole are facilitated.
As a further preferred aspect of the present invention, each drilling main hole is provided with a plurality of pairs of pinnate directional branch holes symmetrically distributed along both sides of the main hole of the deflecting section; the pinnate directional branch holes are drilled into the coal seam at two sides of the main hole of the deflecting section, and a three-dimensional gas extraction hole which covers the horizontal direction and the vertical direction simultaneously is formed.
Preferably, the cross-layer drill holes are radially arranged above the roof rock roadway, and the interval angle between each row of cross-layer drill holes is 4-6 degrees.
Further preferably, after the drilling work of the pinnate directional branch hole, the cross-layer drilling hole and the bedding drilling hole is finished, hole sealing operation is required, and a gas extraction pipeline interface is reserved.
The invention has the following beneficial effects:
1. the pinnate horizontal branch directional drilling is flexibly applied to the field of gas treatment of underground coal seam gas pre-extraction, so that the engineering quantity of drilling and a roadway is greatly reduced, the workload of carrying a drilling machine, leveling the drilling machine field, fixing pipes and the like is reduced, the pipe consumption is reduced, and the drilling cost is effectively reduced.
2. Due to the limitation of the directional drilling mode, the horizontal expansion can only adopt a pinnate horizontal branch directional drilling mode, and the pinnate horizontal branch directional drilling utilizes the controllable advantage of the drilling track to drill in the coal seam floor to the maximum extent under the condition that the construction condition allows, so that the pinnate branch hole is expanded in the horizontal and vertical directions simultaneously, the coverage range and the precision of drilling extraction are enlarged, the drilling engineering quantity of the main hole is reduced, the repeated drilling work is avoided, and the engineering efficiency is obviously improved.
3. Because the deflection angle of the coal seam above the bottom plate rock roadway is too large, the drill hole in the directional drilling mode cannot cover the area, so that the cross-layer drill hole is arranged, the extraction problem of the coal seam within the range of 60 m before and after the drill site is solved, and meanwhile, the bedding drill hole is arranged at the tail end of the directional drill hole and at the position with poor extraction effect, so that the extraction effect is improved.
4. The method is simple to operate, reliable in result, capable of guiding site drilling construction in real time and good in engineering application value.
Drawings
FIG. 1 is a cross-sectional view of a coal mine underground three-dimensional multidimensional gas treatment method of the invention.
FIG. 2 is a plan view showing the arrangement of a main drilling hole, a pinnate directional branch hole and a cross-layer drilling hole in the method for treating the underground coal mine three-dimensional multi-dimensional gas.
FIG. 3 is a schematic diagram of the overall arrangement of drill holes in the underground coal mine three-dimensional multidimensional gas treatment method.
Among them are: 1. a floor rock roadway; 2. drilling a field; 3. a drilling machine; 4. a floor rock layer; 5. a coal seam; 6. a coal seam roof; 7. drilling a main hole; 8. drilling a main hole in a straight section; 9. making a main hole of the inclined section; 10. a pinnate directional branch hole; 11. separating the whipstock; 12. a downhole motor; 13. drilling through layers; 14. drilling holes in the bedding; 15. a coal roadway; 16. a high-pressure rubber hose.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific preferred embodiments.
In the description of the present invention, it is to be understood that the terms "left side", "right side", "upper part", "lower part", etc., indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and that "first", "second", etc., do not represent an important degree of the component parts, and thus are not to be construed as limiting the present invention. The specific dimensions used in the present example are only for illustrating the technical solution and do not limit the scope of protection of the present invention.
The present invention will be described in further detail with reference to the accompanying drawings and specific preferred embodiments.
A coal mine underground three-dimensional multidimensional gas treatment method specifically comprises the following steps:
step 1, as shown in figure 1, arranging a floor rock roadway 1 below a coal seam 5, and constructing and arranging a drill site 2 and a drilling machine 3; the floor rock roadway 1, the drill site 2 and the drilling machine 3 are arranged in a floor rock layer 4 20-30 m below the coal seam 5.
Step 2, after the arrangement of the drilling field 2 is finished, operating the drilling machine 3 to drill into the floor rock stratum 4 at an angle of 5-10 degrees with the coal seam 5; and the front section of the drilling main hole 7 is a straight drilling main hole 8, and the drilling main hole 7 is drilled to a position 55-10 m away from the coal seam and then the tapping work of the straight drilling main hole 7 is stopped.
Step 3, after the hole opening work of the straight section drilling main hole 8 is stopped, the main hole drilling mode is changed into directional drilling; and operating the hole bottom motor 12 to enable the drilling direction to be gradually parallel to the direction of the coal seam 5, and continuing drilling until reaching a group of preset branch hole drilling positions farthest from the drilling field 2 to finish the drilling work of the main hole 9 of the deflecting section.
The drilling main hole 7 comprises a straight drilling main hole 8 and an inclined main hole 9; reaming is needed after the drilling main hole 7 is opened; the aperture of the drilling main hole 7 before reaming is 85-90 mm, and the aperture of the drilling main hole 7 after reaming is 95-105 mm.
And a high-pressure rubber pipe 16 is embedded in the main hole 9 of the reamed deflecting section, so that the subsequent drilling and hydraulic punching operations of the pinnate directional branch hole 10 are facilitated.
Step 4, as shown in fig. 2, placing a separation whipstock 11 at a group of preset branch hole opening positions farthest from the drilling site 2, and drilling the coal seam 5 by operating a drilling direction of a hole bottom motor 12 and forming an acute angle with the coal seam 5; and drilling into the coal seam roof 6 after penetrating the coal seam 5 to complete the drilling of a pinnate directional branch hole 10.
The downhole motor 12 takes the form of a small diameter large turn angle.
Step 5, withdrawing the hole bottom motor 12 from the pinnate directional branch hole 10 to the main hole 9 of the deflecting section, adjusting the position of the separated deflecting device 11, and changing the drilling direction of the hole bottom motor 12 to ensure that the drilling direction is symmetrical to the direction of the pinnate directional branch hole 10 in the step 4 along the main hole 9 of the deflecting section; drilling a deflecting drilling hole into the coal seam 5 through a hole bottom motor 12; after the coal seam 5 is penetrated, the coal seam roof 6 is drilled continuously, and the drilling of another symmetrically positioned pinnate directional branch hole 10 is completed.
And 6, withdrawing the hole bottom motor 12, moving the separating whipstock 11 towards the direction of the drill site 2, moving the separating whipstock to a preset hole opening position adjacent to the pair of the feather-shaped directional branch holes 10, and repeating the steps 4 and 5 to complete the drilling of the second pair of the feather-shaped directional branch holes 10.
Each drilling main hole 7 is provided with a plurality of pairs of pinnate directional branch holes 10 which are symmetrically distributed along two sides of the main hole 9 of the deflecting section; drilling feather-shaped directional branch holes 10 on two sides of the main hole 9 of the deflecting section, penetrating through the coal seam 5 and reaching the top plate 6 of the coal seam; the minimum drilling distance of the pinnate directional branch hole 10 in the coal seam roof 6 is 0.5 m.
And 7, repeating the step 6, and finally finishing a group of three-dimensional directional gas extraction holes consisting of a plurality of pairs of pinnate directional branch holes 10.
Each drilling main hole 7 is provided with 14 pinnate directional branch holes 10, the specific number can be determined according to the working surface condition, the holes are respectively arranged at two sides of the main hole 9 along the deflecting section, and each side is provided with 7 pinnate directional branch holes 10; the interval of each pair of the pinnate directional branch holes 10 is 25 m, the horizontal length penetrating through a coal seam is 15 m, the extraction radius of each pinnate directional branch hole 10 is 15 m, and the whole three-dimensional directional gas extraction hole can cover the range of 80 m to the maximum extent.
As shown in fig. 3, under the condition that construction conditions allow, the pinnate directional branch drilling utilizes the controllable advantage of the drilling track, the drilling is performed on the coal seam floor to the maximum extent, the pinnate branch hole is simultaneously expanded in the horizontal direction and the vertical direction, the coverage range and the precision of drilling extraction are enlarged, the drilling engineering quantity of a main hole is reduced, repeated drilling work is avoided, and the engineering efficiency is obviously improved.
After the drilling of the pinnate directional branch hole 10 is finished, deflecting 4-6 on one side close to the drilling field 2 directionoAnd then, forming a layer-penetrating drill hole 13, and repeatedly forming holes for multiple times to form a row of radial layer-penetrating drill holes 13 covering the coal layer of 60 m above the bottom plate rock roadway. Because the deflection angle of the area is too large, the main hole 9 and the pinnate directional branch hole 10 of the deflecting section cannot cover the area, and therefore the cross-layer drill hole 13 is arranged, and extraction of coal seams in the range of 60 m before and after a drill site is solved. And drilling the layer-penetrating drill holes 12 in the oblique upper part of the main hole 9 of the deflecting section by adopting a common drilling machine, wherein 10 drill holes in each row are radially arranged, 13 rows of drill holes are arranged at intervals of 6 m in each row, and 130 layer-penetrating drill holes 13 are drilled in total to finally form a layer-penetrating drill hole group covering the upper part of the bottom plate rock roadway 1. And the drilling machine drills and retreats after penetrating through the coal seam, and the hydraulic fracturing equipment is used for punching to increase the extraction radius of the cross-layer drill hole 13.
The bedding drill hole 14 is used as a supplement of the directional drill hole and is mainly arranged at the tail end of the directional drill hole and at a position with poor extraction effect. After the coal seam gas extraction reaches the standard and a working face air inlet and return roadway is arranged, a bedding drill hole 14 is formed in a coal roadway 15 on the upper side of a coal seam 5; the interval between two holes of the bedding drilling hole 14 is 5-10 m.
After drilling work of the pinnate directional branch hole 10, the cross-layer drill hole 13 and the bedding drill hole 14 is completed, hole sealing operation is required, and a gas extraction pipeline connector is reserved.
The pinnate horizontal branch directional drilling is flexibly applied to gas treatment of underground coal seam gas pre-extraction, greatly reduces the engineering quantity of drilling and a roadway, and effectively reduces the drilling cost. Meanwhile, the problem that the extraction effect of the conventional method in the horizontal direction is poor is solved, the operation is simple, the result is reliable, the site drilling construction can be guided in real time, and the method has good engineering application value. .
Although the preferred embodiments of the present invention have been described in detail, the present invention is not limited to the details of the embodiments, and various equivalent modifications can be made within the technical spirit of the present invention, and the scope of the present invention is also within the scope of the present invention.

Claims (10)

1. A coal mine underground three-dimensional multidimensional gas treatment method is characterized in that: the method specifically comprises the following steps:
step 1, arranging a bottom plate rock roadway (1) below a coal seam (5), and constructing and arranging a drill site (2) and a drilling machine (3);
step 2, operating the drilling machine (3) to drill into the floor rock stratum (4) at an acute angle with the coal seam (5); the front section of the drilling main hole (7) is a straight section drilling main hole (8), and the drilling operation of the straight section drilling main hole (7) is stopped after a certain distance is drilled;
step 3, after the tapping work of the straight section drilling main hole (8) is stopped, operating a hole bottom motor (12), enabling the drilling direction to be gradually parallel to the direction of the coal seam (5), continuing drilling until reaching a group of preset branch hole tapping positions farthest away from the drilling field (2), and completing the tapping work of the main hole (9) of the inclined section;
step 4, placing a separation whipstock (11) at the position of a group of preset branch hole openings farthest from the drilling field (2), and drilling into the coal seam (5) by operating a drilling direction of a hole bottom motor (12) and the coal seam (5) at an acute angle; drilling into the coal seam roof (6) after penetrating through the coal seam (5) to complete the drilling of a pinnate directional branch hole (10);
step 5, withdrawing the hole bottom motor (12) from the pinnate directional branch hole (10) to the main hole (9) of the deflecting section, adjusting the position of the separated deflecting device (11), and changing the drilling direction of the hole bottom motor (12), so that the drilling direction is symmetrical to the direction of the pinnate directional branch hole (10) in the step 4 along the main hole (9) of the deflecting section; drilling into the coal seam (5) through a hole bottom motor (12); after the drill rod penetrates through the coal seam (5), the drill rod continues to drill into the coal seam roof (6) to finish the drilling of another pinnate directional branch hole (10) at the symmetrical position;
step 6, withdrawing a hole bottom motor (12), moving the separating whipstock (11) towards the direction of the drill site (2), moving to a preset hole opening position adjacent to the pair of the feather-shaped directional branch holes (10) which are completely opened, and repeating the step 4 and the step 5 to complete the drilling of the second pair of the feather-shaped directional branch holes (10);
and 7, repeating the step 6, and finally finishing a group of three-dimensional directional gas extraction holes consisting of a plurality of pairs of pinnate directional branch holes (10).
2. The method for treating the underground coal mine three-dimensional multidimensional gas as recited in claim 1, wherein: after drilling of the pinnate directional branch hole (10) is completed, a layer-penetrating drilling hole (13) is formed after one side close to the drilling field (2) deflects for a certain angle, and a row of radial layer-penetrating drilling holes (13) covering a coal seam above a bottom plate rock roadway are formed after repeated hole opening for multiple times; and constructing a plurality of rows of cross-layer drill holes at intervals in the direction of the coal seam (5) to finally form a cross-layer drill hole group covering the upper part of the bottom plate rock roadway (1).
3. The method for treating the underground coal mine three-dimensional multidimensional gas as recited in claim 1, wherein: after the coal bed gas extraction reaches the standard and a working face air inlet and return roadway is arranged, a bedding drill hole (14) is formed in a coal roadway (15) on the upper side of a coal bed (5); the interval distance between two holes of the bedding drilling hole (14) is 5-10 m.
4. The method for treating the underground coal mine three-dimensional multidimensional gas as recited in claim 1, wherein: the floor rock roadway (1), the drill site (2) and the drilling machine (3) are arranged in the floor rock stratum (4) 20-30 m below the coal seam (5).
5. The method for treating the underground coal mine three-dimensional multidimensional gas as recited in claim 1, wherein: an acute angle formed by the drilling main hole (7) and the coal seam (5) is 5-10 degrees; and stopping the drilling work of the straight section drilling main hole (7) after the drilling main hole (7) drills to a position 5-10 m away from the coal seam (5).
6. The method for treating the underground coal mine three-dimensional multidimensional gas as recited in claim 1, wherein: the drilling main hole (7) comprises a straight drilling main hole (8) and an inclined section main hole (9); reaming is needed after the drilling main hole (7) is opened; the aperture of the drilling main hole (7) before reaming is 85-90 mm, and the aperture of the drilling main hole (7) after reaming is 95-105 mm.
7. The method for treating the underground coal mine three-dimensional multidimensional gas as recited in claim 6, wherein: a high-pressure rubber pipe (16) is embedded in the main hole (9) of the deflecting section after hole expansion, so that subsequent drilling and hydraulic punching operations of the pinnate directional branch hole (10) are facilitated.
8. The method for treating the underground coal mine three-dimensional multidimensional gas as recited in claim 1, wherein: each drilling main hole (7) is provided with a plurality of pairs of pinnate directional branch holes (10) which are symmetrically distributed along two sides of the main hole (9) of the deflecting section; the pinnate directional branch holes (10) are drilled at two sides of the main hole (9) of the deflecting section and penetrate through the coal seam (5) to reach the coal seam roof (6), so that three-dimensional gas extraction holes which cover the horizontal direction and the vertical direction at the same time are formed.
9. The method for treating the underground coal mine three-dimensional multidimensional gas as recited in claim 1, wherein: the layer-penetrating drill holes (13) are radially arranged above the top plate rock roadway, and the interval angle between each row of layer-penetrating drill holes (13) is 4-6 degrees.
10. The method for treating the underground coal mine three-dimensional multidimensional gas as recited in claim 1, wherein: after drilling work of the pinnate directional branch hole (10), the cross-layer drill hole (13) and the bedding drill hole (14) is completed, hole sealing operation is required, and a gas extraction pipeline connector is reserved.
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CN112377241A (en) * 2020-11-10 2021-02-19 王伟 Roof extraction roadway cross-layer drilling and presplitting blasting combined multi-branch directional hole extraction method
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CN117408085A (en) * 2023-12-12 2024-01-16 天津矿智科技有限公司 Method, system, equipment and medium for designing coal mine gas extraction hole position
CN117408085B (en) * 2023-12-12 2024-03-01 天津矿智科技有限公司 Method, system, equipment and medium for designing coal mine gas extraction hole position

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