CN113266414B - Coal roadway tunneling gas control and ventilation method based on large-diameter directional drilling - Google Patents
Coal roadway tunneling gas control and ventilation method based on large-diameter directional drilling Download PDFInfo
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- CN113266414B CN113266414B CN202110647499.5A CN202110647499A CN113266414B CN 113266414 B CN113266414 B CN 113266414B CN 202110647499 A CN202110647499 A CN 202110647499A CN 113266414 B CN113266414 B CN 113266414B
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- 238000005553 drilling Methods 0.000 title claims abstract description 89
- 238000009423 ventilation Methods 0.000 title claims abstract description 69
- 230000005641 tunneling Effects 0.000 title claims abstract description 68
- 239000003245 coal Substances 0.000 title claims abstract description 55
- 238000000034 method Methods 0.000 title claims abstract description 28
- 238000000605 extraction Methods 0.000 claims abstract description 22
- 238000010276 construction Methods 0.000 claims abstract description 4
- 238000005086 pumping Methods 0.000 claims abstract description 4
- 229910000831 Steel Inorganic materials 0.000 claims description 3
- 239000010959 steel Substances 0.000 claims description 3
- 239000011435 rock Substances 0.000 claims description 2
- 230000001360 synchronised effect Effects 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 29
- 239000000428 dust Substances 0.000 description 8
- 206010035653 pneumoconiosis Diseases 0.000 description 4
- 230000009467 reduction Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000036541 health Effects 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 208000028571 Occupational disease Diseases 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000011534 incubation Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F7/00—Methods or devices for drawing- off gases with or without subsequent use of the gas for any purpose
-
- 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
- E21F1/00—Ventilation of mines or tunnels; Distribution of ventilating currents
- E21F1/006—Ventilation at the working face of galleries or tunnels
-
- 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
- E21F1/00—Ventilation of mines or tunnels; Distribution of ventilating currents
- E21F1/04—Air ducts
-
- 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
- E21F5/00—Means or methods for preventing, binding, depositing, or removing dust; Preventing explosions or fires
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Road Paving Structures (AREA)
Abstract
The application discloses a coal roadway tunneling gas treatment and ventilation method based on large-diameter directional drilling, which comprises the following steps: large diameter directional drilling: before tunneling a working face tunnel, constructing a large-diameter directional drilling hole to a tunnel area to be tunneled by utilizing the existing tunnel; after the drilling construction is finished, performing coal bed gas pre-pumping on the roadway area to be tunneled; tunneling and ventilation: and (3) ventilation is carried out in a conventional mode at the initial stage of tunnel tunneling, after a first branch hole is disclosed, an elbow is installed at the stratum section of the branch hole, and ventilation is carried out on a tunneling working face through the drilling holes by using a gas extraction system or auxiliary ventilation equipment. The application realizes the functions of 'one hole is multipurpose', has the functions of 'gas pre-extraction and ventilation of the tunneling working face', and realizes the purpose of implementing the synchronous ventilation of the tunneling working face and the gas extraction of the strip coal seam through single large-diameter directional drilling.
Description
Technical Field
The application belongs to the field of mine ventilation and gas control, and particularly relates to a coal roadway tunneling gas control and ventilation method based on large-diameter directional drilling.
Background
The coal mine tunneling working face is generally ventilated by adopting a mine full-negative-pressure ventilation or a local ventilator, is not only a personnel working place, but also a ventilation air migration channel, and contains a large amount of dust particles and harmful gases, so that the occupational health of on-site personnel and the safety production of a mine are seriously threatened. Long-term operation under such environmental conditions is prone to pneumoconiosis. Pneumoconiosis has the characteristics of long incubation period, strong concealment and the like, and accounts for more than 90% of occupational diseases in China. More than 60% of pneumoconiosis occurs in coal mines, and coal mine pneumoconiosis prevention and treatment work has become a highly interesting problem for society. In order to ensure the production safety of coal mines, improve the occupational health level of mine workers and the production safety level of the mines, development of ventilation methods of tunneling working faces is urgently needed. The underground large-diameter directional long-borehole drilling technology plays an important role in underground gas extraction, water exploration and drainage and local ventilation of mines.
Disclosure of Invention
Aiming at the defects in the prior art, the application provides a coal roadway tunneling gas control and ventilation method based on large-diameter directional drilling.
The application provides a coal roadway tunneling gas treatment and ventilation method based on large-diameter directional drilling, which comprises the following steps:
step S10, large-diameter directional drilling: before the working face tunnel is tunneled, constructing a large-diameter directional drilling hole in a tunnel area to be tunneled by utilizing the existing tunnel A, wherein the large-diameter directional drilling hole comprises a large-diameter directional drilling main hole and a large-diameter directional drilling branch hole, the main hole is distributed in a stable rock stratum of a coal seam roof or a coal seam bottom plate, the main hole track is arranged in parallel with a tunnel contour line to be tunneled, large-diameter branch holes are constructed in the main hole at intervals of a certain distance in the main hole to the tunnel area to be tunneled, the branch holes see that coal points are near the tunnel contour line to be tunneled, and the branch holes drill along the coal seam after entering the coal seam, and the drilling direction of the branch holes is the same as the tunneling direction of the tunnel to be tunneled;
step S20, gas pre-pumping: after the large-diameter directional drilling construction of the step S10 is finished, connecting a drainage system, and pre-draining coal bed gas in a roadway area to be tunneled;
step S30, tunneling ventilation: and (3) ventilation is carried out in a conventional mode at the initial stage of roadway tunneling, after the first branch hole of the large-diameter directional drilling in the step S10 is disclosed, an elbow is installed in a Kong Yan layer section of the branch, the elbow is connected with a wind barrel to extend towards a tunneling working face, and ventilation is carried out on the tunneling working face through the drilling in the step S10 by using a gas extraction system or auxiliary ventilation equipment. And after the next branch hole is disclosed, ventilation is carried out on the tunneling working face by adopting a ventilation method of the last branch hole, the last branch hole is closed at the same time, and the ventilation of the tunneling working face is carried out through the branch hole.
Further, the branch hole arrangement mode follows the position of the next branch hole entering the coal bed near the final hole point of the last branch hole.
Further, the aperture of the large-diameter directional drilling is not less than 300mm.
Further, the plane positions of the major-diameter directional drilling main hole and the roadway to be tunneled are staggered outwards.
Further, the gas extraction system is utilized to carry out extraction ventilation on the tunneling working face through the large-diameter directional drilling holes or full negative pressure ventilation is carried out on the tunneling working face through the large-diameter directional drilling holes by means of auxiliary ventilation facilities at the drilling holes.
Further, the elbow is a steel elbow, and the air duct is a rigid air duct or a flexible air duct with a rigid ring.
Further, an air suction port is arranged at the front end of the air duct, and the air suction port is in a horn shape.
According to the application, coal seam gas in a tunneling area is pre-pumped by utilizing the large-diameter directional drilling before tunneling, and the large-diameter directional drilling extraction type ventilation is utilized during tunneling, so that ventilation of a local ventilation machine of a tunneling working face can be canceled, and the effects of dust fall, noise reduction, energy saving and remarkable improvement on the working environment of the tunneling working face are achieved.
The beneficial effects of the application are as follows: (1) The large-diameter directional drilling hole has multiple purposes, has the functions of gas pre-extraction and ventilation of a tunneling working face, simultaneously achieves the aim of synchronously performing tunneling ventilation and strip coal seam gas extraction through a single large-diameter directional drilling hole, and changes the ventilation mode of the tunneling working face of a coal roadway;
(2) Fresh air flow can be ensured to enter the working face along the roadway, ventilation air methane, dust, float coal and working face coal wall gas in the roadway are pumped out along the drill holes, the dust and gas concentration in the roadway can be effectively reduced, and the working environment of the tunneling working face is obviously improved;
(3) The local ventilator is canceled, and the effects of energy conservation and noise reduction are achieved.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. Like elements or portions are generally identified by like reference numerals throughout the several figures. In the drawings, elements or portions thereof are not necessarily drawn to scale.
FIG. 1 is a plan view of a drilling arrangement of the present application;
FIG. 2 is a cross-sectional view of a drilling arrangement A-A of the present application;
FIG. 3 is a cross-sectional view of a drilling arrangement B-B of the present application;
fig. 4 is a schematic diagram of the ventilation method of the present application.
In the attached drawings, 1-an existing roadway A; 2-large-diameter directional drilling main holes; 3-large diameter directional drilling branch Kong Yan interval; 4-large-diameter directional drilling branch holes along the coal seam drilling section; 5-the existing roadway B;6, tunneling a roadway; 7, tunneling direction; 8-fresh wind flow; 9-return air flow; 10-tunneling working face; 11-a gas extraction system or auxiliary ventilation equipment; 12-elbow; 13-an air duct; 14-suction bell mouth.
Detailed Description
Embodiments of the technical scheme of the present application will be described in detail below with reference to the accompanying drawings. The following examples are only for more clearly illustrating the technical aspects of the present application, and thus are merely examples, and are not intended to limit the scope of the present application.
It is noted that unless otherwise indicated, technical or scientific terms used herein should be given the ordinary meaning as understood by one of ordinary skill in the art to which this application belongs.
As shown in fig. 1-4, the embodiment of the application provides a coal roadway tunneling gas control and ventilation method based on large-diameter directional drilling, which comprises the following steps:
step S10, large-diameter directional drilling: before the working face tunnel is driven, constructing large-diameter directional drilling holes to the area of the tunnel 6 to be driven by utilizing the existing tunnel A1, wherein the tunnel 6 to be driven is positioned at one side of the existing tunnel B5, the large-diameter directional drilling holes comprise large-diameter directional drilling main holes 2 and large-diameter directional drilling branch holes, the main holes are distributed in stable strata of a coal seam roof or a coal seam floor, main hole tracks are arranged in parallel with the contour line of the tunnel 6 to be driven, the large-diameter directional drilling branch holes comprise large-diameter directional drilling branch hole stratum sections 3 and large-diameter directional drilling branch holes along the coal seam drilling sections 4, large-diameter directional drilling branch holes are constructed to the area of the tunnel 6 to be driven at intervals in the main holes, the branch holes are seen to be near the contour line of the tunnel 6 to be driven, the branch holes enter the coal seam and then drill along the coal seam, and the entering directions of the branch holes are the same as the driving directions of the tunnel to be driven;
step S20, gas pre-pumping: connecting a drainage pipeline to pre-drain coal seam gas in the area to be tunneled after drilling construction is completed;
step S30, tunneling ventilation: in the initial stage of roadway driving, ventilation is carried out in a conventional manner, after the first branch hole of the directional drilling in the step S10 is revealed, an elbow 12 is installed in the layer section of the branch Kong Yan, the air duct 13 is connected to the elbow 12 to extend towards the driving working face 10, and the gas extraction system or auxiliary ventilation equipment 11 is utilized to ventilate the driving working face 10 through the drilling in the step S10. When the next branch hole is revealed, the step is repeated to ventilate the tunneling working face, and the last branch hole is closed. And so on, ventilation of the tunneling working surface is implemented through the branch hole.
The arrangement mode of the large-diameter directional drilling branch holes is based on the principle that the position of the next branch hole entering the coal seam is near the final hole point of the last branch hole, so that the branch holes are mutually connected and continued, and a gas extraction blind area is avoided in the drilling coverage area.
In order to realize gas pre-extraction, tunneling ventilation, dust fall, noise reduction and energy saving, the aperture of the large-diameter directional drilling hole is set to be not smaller than 300mm, and the spatial positions of the main large-diameter directional drilling hole 2 and the roadway 6 to be tunneled are arranged in an outward staggered manner.
The gas extraction system is utilized to carry out the extraction type ventilation of the tunneling working face 10 through the large-diameter directional drilling or the full negative pressure ventilation of the working face through the large-diameter directional drilling by means of the auxiliary ventilation facility at the drilling hole position, so that the ventilation mode of the coal roadway tunneling working face 10 is changed.
In order to improve the service lives of the elbow 12 and the air duct 13, the elbow 12 is made of steel, and the air duct 13 is made of a rigid air duct or a flexible air duct with a rigid ring; in order to better absorb the wind flow, a wind suction horn mouth 14 is arranged at the front end of a rigid wind barrel or a flexible wind barrel with a rigid ring to absorb the wind flow of the working surface.
Through the ventilation mode of fig. 4, fresh air flow 8 can be guaranteed to enter the working face along the tunneling direction 7 of the roadway, return air flow 9 is extracted along the large-diameter directional drilling hole, dust, float coal and working face coal wall gas in the roadway can be extracted along the large-diameter directional drilling hole, the concentration of dust and gas in the tunneling working face can be effectively reduced, and the working environment of the tunneling working face is remarkably improved.
According to the embodiment, coal seam gas in a tunneling area is pre-pumped by utilizing the large-diameter directional drilling holes before tunneling, and the large-diameter directional drilling holes are used for extraction type ventilation during tunneling, so that a local ventilation machine of a tunneling working face can be canceled, and the effects of dust fall, noise reduction, energy saving and remarkable improvement on the working environment of the tunneling working face are achieved. The large-diameter directional drilling is multipurpose, has the functions of gas pre-extraction and tunneling ventilation, achieves the aim of synchronously performing tunneling ventilation and coal roadway strip gas extraction through a single large-diameter directional drilling, and changes the ventilation mode of the coal roadway tunneling working face 10.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present application, and not for limiting the same; although the application has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the application, and are intended to be included within the scope of the appended claims and description.
Claims (9)
1. A coal roadway tunneling gas control and ventilation method based on large-diameter directional drilling comprises the following steps:
step S10, large-diameter directional drilling: before the working face tunnel is tunneled, constructing a large-diameter directional drilling hole in a tunnel area to be tunneled by utilizing the existing tunnel A, wherein the large-diameter directional drilling hole comprises a large-diameter directional drilling main hole and a large-diameter directional drilling branch hole, the main hole is distributed in a stable rock stratum of a coal seam roof or a coal seam bottom plate, the main hole track is arranged in parallel with a tunnel contour line to be tunneled, large-diameter directional drilling branch holes are constructed in the main hole at intervals of a certain distance in the main hole, the branch holes see that coal points are near the tunnel contour line to be tunneled, the branch holes drill along the coal seam after entering the coal seam, and the drilling direction of the branch holes is the same as the tunneling direction of the tunnel to be tunneled;
in step S10, the arrangement mode of the large-diameter directional drilling branch holes follows the position of the next branch hole entering the coal bed to be near the final hole point of the last branch hole;
step S20, gas pre-pumping: after the large-diameter directional drilling construction of the step S10 is finished, connecting a drainage system, and pre-draining coal bed gas in a roadway area to be tunneled;
step S30, tunneling ventilation: and (3) in the initial stage of roadway tunneling, ventilation is carried out in a conventional mode, after the first branch hole of the large-diameter directional drilling in the step (S10) is disclosed, an elbow is installed on the stratum section of the branch hole, the air duct is connected to the elbow to extend towards the tunneling working face, the gas extraction system or auxiliary ventilation equipment is utilized to ventilate the tunneling working face through the large-diameter directional drilling in the step (S10), when the ventilation method of the last branch hole is repeated after the next branch hole is disclosed, the last branch hole is sealed, and the ventilation of the tunneling working face is implemented through the branch hole.
2. The coal roadway tunneling gas treatment and ventilation method based on large-diameter directional drilling as claimed in claim 1, wherein the method comprises the following steps: in step S10, the hole diameter of the large-diameter directional drilling is not smaller than 300mm.
3. The coal roadway tunneling gas treatment and ventilation method based on large-diameter directional drilling as claimed in claim 1, wherein the method comprises the following steps: in step S10, the plane positions of the main hole of the large-diameter directional drilling hole and the tunnel to be tunneled are staggered.
4. The coal roadway tunneling gas treatment and ventilation method based on large-diameter directional drilling as claimed in claim 1, wherein the method comprises the following steps: in step S30, the gas extraction system is utilized to carry out extraction ventilation on the tunneling working face through the large-diameter directional drilling.
5. The coal roadway tunneling gas treatment and ventilation method based on large-diameter directional drilling as claimed in claim 1, wherein the method comprises the following steps: in step S30, full negative pressure ventilation is performed on the driving face by means of the auxiliary ventilation means through the large diameter directional drilling at the drilling opening.
6. The coal roadway tunneling gas treatment and ventilation method based on large-diameter directional drilling as claimed in claim 1, wherein the method comprises the following steps: in step S30, the elbow is a steel elbow.
7. The coal roadway tunneling gas treatment and ventilation method based on large-diameter directional drilling as claimed in claim 1, wherein the method comprises the following steps: in step S30, the air duct is a rigid air duct or a flexible air duct with a rigid ring.
8. The coal roadway tunneling gas treatment and ventilation method based on large-diameter directional drilling of claim 7, wherein the method comprises the following steps: and an air suction port is arranged at the front end of the air duct.
9. The coal roadway tunneling gas treatment and ventilation method based on large-diameter directional drilling of claim 8, wherein the method comprises the following steps: the air suction port is horn-shaped.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110647499.5A CN113266414B (en) | 2021-06-10 | 2021-06-10 | Coal roadway tunneling gas control and ventilation method based on large-diameter directional drilling |
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| CN202110647499.5A CN113266414B (en) | 2021-06-10 | 2021-06-10 | Coal roadway tunneling gas control and ventilation method based on large-diameter directional drilling |
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| CN113266414B true CN113266414B (en) | 2023-11-28 |
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| CN116771277B (en) * | 2023-06-08 | 2024-02-23 | 华能云南滇东能源有限责任公司 | Gas extraction directional drilling system and equipment |
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