CN114483160A - Gas extraction method for connecting roadway - Google Patents
Gas extraction method for connecting roadway Download PDFInfo
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- CN114483160A CN114483160A CN202111616569.7A CN202111616569A CN114483160A CN 114483160 A CN114483160 A CN 114483160A CN 202111616569 A CN202111616569 A CN 202111616569A CN 114483160 A CN114483160 A CN 114483160A
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- 238000000605 extraction Methods 0.000 title claims abstract description 12
- 230000035939 shock Effects 0.000 claims abstract description 195
- 239000003245 coal Substances 0.000 claims abstract description 66
- 238000005553 drilling Methods 0.000 claims abstract description 34
- 238000010276 construction Methods 0.000 claims abstract description 19
- 238000000034 method Methods 0.000 claims abstract description 12
- 238000009434 installation Methods 0.000 claims abstract description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 83
- 238000002347 injection Methods 0.000 claims description 9
- 239000007924 injection Substances 0.000 claims description 9
- 239000007921 spray Substances 0.000 claims description 9
- 238000004891 communication Methods 0.000 claims description 6
- 230000009471 action Effects 0.000 claims description 3
- 230000005540 biological transmission Effects 0.000 claims description 3
- 230000005611 electricity Effects 0.000 claims description 3
- 239000011810 insulating material Substances 0.000 claims description 3
- 230000035699 permeability Effects 0.000 abstract description 7
- 238000005516 engineering process Methods 0.000 abstract description 5
- 239000011435 rock Substances 0.000 description 9
- 238000005086 pumping Methods 0.000 description 5
- 230000005641 tunneling Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 239000000243 solution Substances 0.000 description 4
- 238000009423 ventilation Methods 0.000 description 4
- 238000005422 blasting Methods 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 206010016807 Fluid retention Diseases 0.000 description 1
- 230000002238 attenuated effect Effects 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 230000008961 swelling Effects 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F7/00—Methods or devices for drawing- off gases with or without subsequent use of the gas for any purpose
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21C—MINING OR QUARRYING
- E21C37/00—Other methods or devices for dislodging with or without loading
- E21C37/06—Other methods or devices for dislodging with or without loading by making use of hydraulic or pneumatic pressure in a borehole
- E21C37/12—Other methods or devices for dislodging with or without loading by making use of hydraulic or pneumatic pressure in a borehole by injecting into the borehole a liquid, either initially at high pressure or subsequently subjected to high pressure, e.g. by pulses, by explosive cartridges acting on the liquid
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/14—Layout of tunnels or galleries; Constructional features of tunnels or galleries, not otherwise provided for, e.g. portals, day-light attenuation at tunnel openings
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- 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
- E21F17/00—Methods or devices for use in mines or tunnels, not covered elsewhere
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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)
- Environmental & Geological Engineering (AREA)
- Drilling And Exploitation, And Mining Machines And Methods (AREA)
Abstract
The application discloses a method for extracting gas from a connected roadway, which comprises the following steps: presetting a roadway layout track of a connection roadway, wherein a region where the roadway layout track is intersected with a coal seam is a shock wave anti-reflection region; setting a construction roadway as a roadway closest to the normal distance of the shock wave anti-reflection region, and setting a region closest to the shock wave anti-reflection region in the construction roadway as an equipment placement region; arranging drill holes between shock wave anti-reflection areas in the equipment arrangement area, and arranging shock wave operation points at parts of the drill holes in the shock wave anti-reflection areas; after drilling holes, performing shock wave anti-reflection operation on shock wave operation points through shock wave generating equipment in an equipment installation area, wherein the shock waves enable cracks to be formed in coal bodies, and the cracks are gas seepage channels; and extracting gas in the coal body at the orifice of the drill hole. The application solves the problem of low efficiency in gas extraction through the controllable shock wave coal seam permeability increasing technology in the prior art.
Description
Technical Field
The application belongs to the technical field of coal mining, and particularly relates to a gas extraction method for a connected roadway.
Background
In the underground coal mine adopting the vertical shaft, adit or connection roadway development mode, the construction of an underground ventilation system is required to be completed in advance in the aspect of roadway arrangement, namely, a main roadway is firstly developed and an effective air inlet and return system is formed, so that a framework of a single well field is naturally formed. On the basis, the horizontal, panel area and stope working surface are divided to carry out ordered coal stope, before a roadway of the system is formed, a new communication roadway for ventilation, pedestrians or transportation needs to be further developed, and the communication roadway usually needs to be penetrated, horizontally penetrated or penetrated by one or more coal seams for cross-cut coal uncovering.
The rock cross-cut coal uncovering is a process that the coal is gradually entered into a coal bed by rock roadway cross-cut tunneling, and in the process, because the coal bed is usually high in gas content and pressure, coal and gas outburst is easily caused, and further, very serious damage results are easily caused during tunneling. Therefore, the outburst elimination treatment must be carried out on the target coal seam before cross-cut coal uncovering, and the gas content of the coal seam is reduced.
When the existing rock cross-cut coal uncovering gas is pre-pumped, the conventional measures are mainly intensive drilling, and the unconventional measures comprise hydraulic measures, carbon dioxide permeability increase, deep hole pre-splitting blasting and controllable shock wave coal seam permeability increase technologies. The disadvantages of the measures are mainly expressed as follows: the hole distribution interval of the dense drill holes is 0.5-3 m, the pre-pumping effect of a large number of dense drill holes in a small range is poor, the pure quantity of the pumped gas is attenuated quickly (about 1-7 days), and the drilling depth ruler is high (about 10 kilometers for the gas pre-pumping drill holes on a single working face). During deep hole pre-splitting blasting, the anti-reflection depth is short, the control variable during explosive loading is large, and drilling holes are damaged after blasting or gas-liquid phase change. The hydraulic measures mainly include fracturing and slotting, the requirement on coal hardness is high, a seam network cannot be formed after the hydraulic measures, and the problem that the direction of main crack development is uncontrollable due to the influence of the coal rock stratum structure exists; when a common controllable shock wave coal seam permeability increasing technology is used for drilling, the length of a drill hole is usually longer, so that more manpower and material resources are needed to be consumed for drilling the drill hole, and meanwhile, when the shock wave generating equipment is pushed, the problem of low efficiency is caused due to the longer length of the drill hole. Therefore, when the cross cut coal uncovering is carried out in the tunneling process of the connection roadway, the existing gas pre-pumping scheme cannot meet the actual use requirement.
Disclosure of Invention
The embodiment of the application provides a method for extracting gas of a connected roadway, and solves the problem that the efficiency is low when the gas extraction is carried out through a controllable shock wave coal seam permeability increasing technology in the prior art.
The embodiment of the invention provides a method for extracting gas from a connected roadway, which comprises the following steps:
presetting a roadway layout track of a connection roadway, wherein the roadway layout track is intersected with more than one coal seam;
a coal seam with the thickness of less than 0.5m is a subsequent anti-reflection coal seam, and the subsequent anti-reflection coal seam performs shock wave anti-reflection operation through shock wave generating equipment when the communication roadway is tunneled;
the intersection region of the roadway layout track and the coal seam with the thickness of more than 0.5m is a shock wave anti-reflection region;
setting a construction roadway as a roadway closest to the normal distance of the shock wave anti-reflection region, wherein a region closest to the shock wave anti-reflection region in the construction roadway is an equipment installation region;
arranging drill holes between the equipment arrangement area and the shock wave anti-reflection area, wherein the drill holes penetrate through the shock wave anti-reflection area, and shock wave operation points are arranged at the parts of the drill holes, which are positioned in the shock wave anti-reflection area;
after the drill hole is drilled, performing shock wave anti-reflection operation on the shock wave operation point through shock wave generating equipment in the equipment installation area, wherein the shock wave enables cracks to be formed in the coal body, and the cracks are gas seepage channels;
and extracting gas in the coal body through the fractures at the orifice of the drill hole.
In one possible implementation, the bore is a branch bore comprising a main bore, and a plurality of branch bores;
drilling the main hole in the equipment installation area towards the direction of the shock wave anti-reflection area;
when the distance between the main hole and the shock wave anti-reflection area is 20-30 m, drilling a plurality of branch holes, wherein the connecting positions of the branch holes and the main hole are deflecting points;
the distance between two adjacent branch holes is 3-8 m, the branch holes are uniformly distributed in the shock wave anti-reflection area, and the end parts of the branch holes extend to the outer side of the shock wave anti-reflection area.
In one possible implementation, the bore is a comb bore comprising a main bore, and a plurality of branch bores;
drilling the main holes in the equipment arrangement area towards the direction of the shock wave anti-reflection area, and finishing the operation of the main holes when the main holes are 3-8 m away from the edge of the shock wave anti-reflection area after the main holes enter the shock wave anti-reflection area;
drilling branch holes at intervals at the part of the main hole, which is positioned in the shock wave anti-reflection area, wherein the distance between two adjacent branch holes is 3-8 m, and the connecting position of the branch holes and the main hole is a deflecting point;
the distance between two adjacent branch holes is 3-8 m, the branch holes are uniformly distributed in the shock wave anti-reflection area, and the end parts of the branch holes extend to the outer side of the shock wave anti-reflection area.
In one possible implementation manner, one shock wave operation point is arranged every 6m at the part, located in the shock wave anti-reflection area, of the branch hole; the shock wave operation points of two adjacent branch holes are arranged in a staggered manner;
and the shock wave operating point is not arranged in a spherical area with the deflecting point as the center of a circle and the radius of 10 m.
In a possible implementation manner, the specific step of performing, by the shock wave generating apparatus, a shock wave antireflection operation on the shock wave operation point includes:
installing an orifice device at the orifice of the borehole, and then pushing the shock wave generating apparatus to the shock wave operating point of the branch bore with the transducer window of the shock wave generating apparatus located at the shock wave operating point;
connecting a cable of the shock wave generating apparatus with a pulse power driving source; connecting a water injection interface of the shock wave generating equipment to a water tank through a water injection pipe;
opening a valve of the water tank, and injecting water into a bag arranged at a transducer window of the shock wave generation equipment by the water tank through a booster pump; observing the reading of a pressure gauge on the water injection pipe, wherein when the reading of the pressure gauge is a set value, the bag expands and is attached to the side wall of the drilled hole;
the pulse power driving source discharges electricity to the shock wave generating equipment, the shock wave generating equipment generates shock waves, the shock waves directly do work on the coal under the transmission of the water medium in the bag, the coal is enabled to generate the cracks, the bag is made of insulating materials, and when the shock waves do work, the bag keeps in an expansion state.
In one possible implementation, the step of pushing the shockwave generating device to the branch hole comprises:
pushing the shock wave generating device through a drill rod by using a drilling machine;
when the shock wave generating equipment moves to the deflecting point, a valve of the water tank is opened, the water tank injects water into a steering gear at the front end of the shock wave generating equipment through a booster pump, and the steering gear is connected to the front end of the shock wave generating equipment through a universal joint;
the steering device controls the first flow electromagnetic valve, the second flow electromagnetic valve and/or the third flow electromagnetic valve to act according to preset steering parameters; the first flow solenoid valve controls the first water outlet to spray water with a set flow rate, the second flow solenoid valve controls the second water outlet to spray water with a set flow rate, the third flow solenoid valve controls the third water outlet to spray water with a set flow rate, and the first water outlet, the second water outlet and the third water outlet are uniformly distributed in the circumferential direction of the steering gear;
the diverter is used for diverting under the action of water sprayed from the first water outlet, the second water outlet and/or the third water outlet, the diverter moves into the branch hole, and the shock wave generating equipment is pushed continuously until the shock wave generating equipment is moved to the set shock wave operating point.
One or more technical solutions provided in the embodiments of the present invention have at least the following technical effects or advantages:
the embodiment of the invention provides a method for extracting gas from a connection roadway, wherein during the construction of the connection roadway, a mineworker coal mine has already completed the construction of the main roadway, an air return roadway, a transportation roadway and other roadways, and the connection roadway has the function of developing a new roadway for ventilation, pedestrians or transportation, so that when the connection roadway is subjected to rock cross coal uncovering, the construction of the shock wave permeability increasing operation can be carried out on the connection roadway in the nearest roadway, namely the roadway with the nearest normal distance to the shock wave permeability increasing area is constructed. The rock cross-cut coal uncovering mode shortens the length of the drilled hole, is simple in matching process, achieves advanced pre-pumping of the coal bed, improves the working efficiency, and can achieve the purpose of safe and rapid tunneling of a roadway.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments of the present invention will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic diagram of a roadway layout track of a communication roadway provided in an embodiment of the present invention.
Fig. 2 is an enlarged view of fig. 1 at a.
Fig. 3 is an enlarged view of fig. 1 at B.
Fig. 4 is a schematic view of an operating state of a shock wave generating apparatus according to an embodiment of the present invention.
Reference numerals: 1-connecting the laneway; 2-coal bed; 3-shock wave anti-reflection area; 4, constructing a roadway; 5-a device placement area; 6, drilling; 7-a main hole; 8-a branch hole; 9-a shock wave generating device; 10-a pouch; 11-a diverter; 12-a first water outlet; 13-deflecting point.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the embodiments of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience in describing the embodiments of the present invention and simplifying the description, but do not indicate or imply that the referred devices or elements must have specific orientations, be configured in specific orientations, and operate, and thus, should not be construed as limiting the present invention. The terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Furthermore, the terms "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. Specific meanings of the above terms in the embodiments of the present invention can be understood by those of ordinary skill in the art according to specific situations.
As shown in fig. 1 to 4, the method for extracting gas from an interconnection roadway according to the embodiment of the present invention includes the following steps:
the method comprises the steps of presetting a roadway layout track of a connecting roadway 1, wherein the roadway layout track is intersected with more than one coal seam 2.
And the coal seam 2 with the thickness of less than 0.5m is a subsequent anti-reflection coal seam, and the subsequent anti-reflection coal seam performs shock wave anti-reflection operation through shock wave generating equipment 9 when the communication roadway 1 is tunneled.
The area where the roadway layout track intersects with the coal seam 2 with the thickness of more than 0.5m is a shock wave anti-reflection area 3.
The construction roadway 4 is a roadway which is closest to the normal distance of the shock wave anti-reflection region 3, and the region which is closest to the shock wave anti-reflection region 3 in the construction roadway 4 is an equipment installation region 5.
And arranging drill holes 6 between the shock wave anti-reflection areas 3 in the equipment arrangement area 5, wherein the drill holes 6 penetrate through the shock wave anti-reflection areas 3, and arranging shock wave operation points at the parts of the drill holes 6 in the shock wave anti-reflection areas 3.
After the drill holes 6 are drilled, shock wave anti-reflection operation is carried out on a shock wave operation point through shock wave generating equipment 9 in an equipment installation area 5, and the shock waves enable cracks to be formed in the coal body, wherein the cracks are gas seepage channels.
And extracting gas in the coal body through fractures at the orifice of the drill hole 6.
It should be noted that when the subsequent anti-reflection coal seam is tunneled in the connection roadway 1, holes are drilled on the tunneling working face, and the shock wave anti-reflection operation is performed through the shock wave generating device 9. The gas content of the coal seam 2 with the thickness of less than 0.5m is less, so that the gas pre-extraction can be effectively carried out according to the conventional construction method.
When the connection roadway 1 is constructed, the underground coal mine has already completed the construction of the main roadway, the return airway, the transportation roadway and other roadways, and the connection roadway 1 is used for developing new roadways for ventilation, pedestrians or transportation, therefore, when the connection roadway 1 is used for carrying out rock cross-cut coal uncovering, the invention can carry out the construction of shock wave anti-reflection operation on the connection roadway 1 in the nearest roadway, namely the roadway with the nearest normal distance to the shock wave anti-reflection area 3, thereby reducing the length of the drill hole 6. Of course, if the distance between the orifice of the connecting roadway 1 and the shock wave anti-reflection area 3 is the nearest point, pre-pumping of the gas in the coal seam 2 is performed at the orifice of the connecting roadway 1. Fig. 1 is a cross-sectional view of a coal seam, a roadway layout track of a connection roadway 1 in the figure is intersected with two coal seams 2, a roadway above the coal seam 2 is a construction roadway 4 corresponding to the shock wave anti-reflection area 3, a drill hole 6 is a construction drill hole with the nearest distance from the construction roadway 4 to the connection roadway 1, and the drill hole 6 is perpendicular to the construction roadway 4.
In this embodiment, the bore 6 is a branch bore comprising a main bore 7, and a plurality of branch bores 8.
And drilling a main hole 7 in the direction of the shock wave anti-reflection region 3 in the equipment installation region 5.
And when the main hole 7 is 320-30 m away from the shock wave anti-reflection area, drilling a plurality of branch holes 8, wherein the connecting positions of the branch holes 8 and the main hole 7 are deflecting points 13.
The distance between two adjacent branch holes 8 is 3-8 m, the branch holes 8 are uniformly distributed in the shock wave anti-reflection region 3, and the end parts of the branch holes 8 extend to the outer side of the shock wave anti-reflection region 3.
It is to be noted that the branch drilling is shown in fig. 2, and the main hole 7 branches off the plurality of branch holes 8 from the kick-off point 13.
In this embodiment, the bore 6 is a comb bore comprising a main bore 7 and a plurality of branch bores 8.
And drilling a main hole 7 in the equipment arrangement region 5 towards the direction of the shock wave anti-reflection region 3, and after the main hole 7 enters the shock wave anti-reflection region 3, finishing the operation of the main hole 7 when the main hole 7 is 3-8 m away from the edge of the shock wave anti-reflection region 3.
And drilling branch holes 8 at intervals at the part of the main hole 7 in the shock wave anti-reflection region 3, wherein the distance between two adjacent branch holes 8 is 3-8 m, and the connecting position of the branch holes 8 and the main hole 7 is a deflecting point 13.
The distance between two adjacent branch holes 8 is 3-8 m, the branch holes 8 are uniformly distributed in the shock wave anti-reflection region 3, and the end parts of the branch holes 8 extend to the outer side of the shock wave anti-reflection region 3.
It should be noted that the comb drilling is shown in fig. 3, and the plurality of deflecting points 13 connecting the branch holes 8 and the main hole 7 are arranged at intervals, and the comb drilling can facilitate the pushing of the shock wave generating apparatus 9.
The mineworker's coal mine usually covers a large area, and thus the efficiency of drilling 6 can be improved by providing the main hole 7 and the plurality of branch holes 8. The problems of low efficiency and high cost caused by the need of arranging a plurality of independent drill holes 6 in the conventional scheme are avoided.
In this embodiment, a shock wave operation point is provided every 6m at the portion of the branch hole 8 located in the shock wave anti-reflection region 3. The shock wave operation points of two adjacent branch holes 8 are arranged in a staggered mode.
Wherein, the spherical area with the deflecting point 13 as the center and the radius of 10m is not provided with a shock wave operating point.
It should be noted that the staggered arrangement of the shock wave operating points provides better working performance while preventing collapse of the borehole 6.
A shock wave operation point is not arranged in a spherical area with the radius of 10m and the deflecting point 13 as the center of a circle, so that the problem that the drilled hole 6 is easy to collapse due to low structural strength at the deflecting point 13 is solved.
In this embodiment, the specific steps of performing the shock wave anti-reflection operation on the shock wave operation point by the shock wave generating device 9 include:
the orifice device is installed in the orifice of the borehole 6 and the shock wave generating apparatus 9 is then pushed to the shock wave operating point of the branch bore 8 with the transducer window of the shock wave generating apparatus 9 located at the shock wave operating point.
The cable of the shock wave generating apparatus 9 is connected to the pulse power driving source. The water injection port of the shock wave generating device 9 is connected to the water tank through a water injection pipe.
The valve of the water tank is opened and the water tank injects water through the booster pump into the bladder 10 provided at the transducer window of the shock wave generating device 9. Observe the reading of the manometer on the water injection pipe, when the reading of manometer was for setting for numerical value, the 10 rises of bag and laminates on the lateral wall of drilling 6.
The pulse power driving source discharges electricity to the shock wave generating device 9, the shock wave generating device 9 generates shock waves, the shock waves directly work the coal body under the transmission of the water medium in the bag 10 and enable the coal body to generate cracks, the bag 10 is made of insulating materials, and when the shock waves work, the bag 10 keeps in a swelling state.
It should be noted that the water medium is stored in the bag 10 to apply work to the rock mass, so that the problem that the shock wave operation can be implemented only by injecting water into the drill hole 6 in the prior art is solved. Therefore, when the shock wave operation is carried out on the uplink drilling hole 6 or the vertical drilling hole 6, the link of filling water into the drilling hole 6 can be omitted, and the water bag type shock wave generating device can directly apply work to the rock mass, so that the problems of poor operation effect of the shock wave and certain potential safety hazard caused by the factors of unclear water filling position of the drilling hole 6, poor water retention of crack development of the drilling hole 6, poor hole sealing effect of the drilling hole 6 and the like are solved.
In this embodiment, the specific step of pushing the shock wave generating apparatus 9 to the branch hole 8 includes:
the shock wave generating device 9 is pushed through the drill rod by means of a drilling machine.
When the shock wave generating apparatus 9 moves to the deflecting point 13, a valve of the water tank is opened, the water tank injects water into the steering gear 11 at the front end of the shock wave generating apparatus 9 through the booster pump, and the steering gear 11 is connected to the front end of the shock wave generating apparatus 9 through the universal joint.
The steering gear 11 controls the first flow solenoid valve, the second flow solenoid valve and/or the third flow solenoid valve to act according to preset steering parameters. The first flow solenoid valve controls the first water outlet 12 to spray water with a set flow rate, the second flow solenoid valve controls the second water outlet to spray water with a set flow rate, the third flow solenoid valve controls the third water outlet to spray water with a set flow rate, and the first water outlet 12, the second water outlet and the third water outlet are uniformly distributed in the circumferential direction of the steering gear 11.
The diverter 11 diverts under the action of water sprayed from the first water outlet 12, the second water outlet and/or the third water outlet, the diverter 11 moves into the branch hole 8, and the shock wave generating device 9 continues to be pushed until the shock wave generating device 9 moves to a set shock wave operating point.
The diverter 11 guides the shock wave generating device 9 to divert by forming a set angle between the reaction force of the ejected water and the shock wave generating device 9, so as to ensure that the shock wave generating device 9 can be pushed into the set branch hole 8.
Turn to through the reaction force of water, can avoid setting up mechanical structure and turn to, and have the easy joint of mechanical structure and turn to in 6 problems in the drilling, 11 partial structures that utilize the 9 water pockets of shock wave production equipment to fill water system of steering gear simultaneously, for example water tank, booster pump etc. make this steering gear structure set up comparatively rationally, and the practicality is strong.
When the shock wave generating equipment is pushed, the shock wave generating equipment is pushed to the first branch hole 8, after the shock wave anti-reflection operation of the first branch hole 8 is completed, the shock wave generating equipment is retreated to the deflecting point 13, and then the shock wave generating equipment is pushed to the second branch hole 8 to perform the shock wave anti-reflection operation. From the above, the main hole 7 is pushed once, and the hole positions are switched at the deflecting points 13, so that the shock wave anti-reflection operation of all shock wave operation points can be realized, the length of the pushing path of the shock wave generating equipment is shortened, and the efficiency of gas extraction by the controllable shock wave coal seam anti-reflection technology is improved.
The embodiments in the present specification are described in a progressive manner, and the same or similar parts among the embodiments may be referred to each other, and each embodiment focuses on the differences from the other embodiments.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and all simple modifications, changes and equivalent structural changes made to the above embodiment according to the technical spirit of the present invention still fall within the protection scope of the technical solution of the present invention.
Claims (6)
1. A method for extracting gas from a connected roadway is characterized by comprising the following steps: the method comprises the following steps:
presetting a roadway layout track of a connecting roadway (1), wherein the roadway layout track is intersected with more than one coal seam (2);
the coal seam (2) with the thickness of less than 0.5m is a subsequent anti-reflection coal seam, and the subsequent anti-reflection coal seam performs shock wave anti-reflection operation through shock wave generating equipment (9) when the communication roadway (1) is tunneled;
the area where the roadway layout track intersects with the coal seam (2) with the thickness of more than 0.5m is a shock wave anti-reflection area (3);
setting a construction roadway (4) as a roadway which is closest to the normal distance of the shock wave anti-reflection region (3), and setting a region which is closest to the shock wave anti-reflection region (3) in the construction roadway (4) as an equipment placement region (5);
arranging drill holes (6) between the equipment arrangement region (5) and the shock wave anti-reflection region (3), wherein the drill holes (6) penetrate through the shock wave anti-reflection region (3), and shock wave operation points are arranged at the parts, located in the shock wave anti-reflection region (3), of the drill holes (6);
after the drill hole (6) is drilled, shock wave anti-reflection operation is carried out on the shock wave operation point through shock wave generation equipment (9) in the equipment installation area (5), the shock wave enables cracks to be formed in the coal body, and the cracks are gas seepage channels;
and extracting gas in the coal body through the fractures at the orifice of the drill hole (6).
2. The connection roadway gas extraction method according to claim 1, characterized by comprising: the bore (6) is a branch bore comprising a main bore (7) and a plurality of branch bores (8);
drilling the main hole (7) in the equipment installation region (5) towards the direction of the shock wave anti-reflection region (3);
when the distance between the main hole (7) and the shock wave anti-reflection area (3) is 20-30 m, drilling a plurality of branch holes (8), wherein the connecting positions of the branch holes (8) and the main hole (7) are deflecting points (13);
the distance between two adjacent branch holes (8) is 3-8 m, the branch holes (8) are uniformly distributed in the shock wave anti-reflection region (3), and the end parts of the branch holes (8) extend to the outer side of the shock wave anti-reflection region (3).
3. The connection roadway gas extraction method according to claim 1, characterized by comprising: the bore (6) is a comb bore comprising a main bore (7) and a plurality of branch bores (8);
drilling the main holes (7) in the equipment installation area (5) towards the shock wave anti-reflection area (3), wherein after the main holes (7) enter the shock wave anti-reflection area (3), the operation of the main holes (7) is completed when the main holes (7) are 3-8 m away from the edge of the shock wave anti-reflection area (3);
drilling branch holes (8) at intervals at the part, located in the shock wave anti-reflection region (3), of the main hole (7), wherein the distance between every two adjacent branch holes (8) is 3-8 m, and a deflecting point (13) is arranged at the position where the branch holes (8) are connected with the main hole (7);
the distance between two adjacent branch holes (8) is 3-8 m, the branch holes (8) are uniformly distributed in the shock wave anti-reflection region (3), and the end parts of the branch holes (8) extend to the outer side of the shock wave anti-reflection region (3).
4. The connection roadway gas extraction method according to any one of claims 2 or 3, characterized by comprising: arranging one shock wave operating point every 6m at the part, located in the shock wave anti-reflection region (3), of the branch hole (8); the shock wave operating points of two adjacent branch holes (8) are arranged in a staggered manner;
wherein the shock wave operating point is not arranged in a spherical area with the deflecting point (13) as the center of a circle and the radius of 10 m.
5. The connection roadway gas extraction method according to claim 4, characterized by comprising: the specific steps of performing shock wave anti-reflection operation on the shock wave operation point through the shock wave generation equipment (9) comprise:
installing an orifice device in the orifice of the borehole (6) and then pushing the shock wave generating apparatus (9) to the shock wave operating point of the branch bore (8) with the transducer window of the shock wave generating apparatus (9) located at the shock wave operating point;
connecting the cable of the shock wave generating device (9) with a pulsed power drive source; connecting a water injection interface of the shock wave generating equipment (9) to a water tank through a water injection pipe;
opening a valve of the water tank, and injecting water into a bag (10) arranged at a transducer window of the shock wave generation equipment (9) by the water tank through a booster pump; observing the reading of a pressure gauge on the water injection pipe, wherein when the reading of the pressure gauge is a set value, the bag (10) is expanded and attached to the side wall of the drill hole (6);
the pulse power driving source discharges electricity to the shock wave generating device (9), the shock wave generating device (9) generates shock waves, the shock waves directly apply work to the coal under the transmission of the water medium in the bag (10) and enable the coal to generate cracks, the bag (10) is made of insulating materials, and when the shock waves apply work, the bag (10) keeps in an expanding state.
6. The connection roadway gas extraction method according to claim 5, characterized by comprising: the specific step of pushing the shock wave generating device (9) to the branch hole (8) comprises:
pushing the shock wave generating device (9) through a drill rod by means of a drilling machine;
when the shock wave generating equipment (9) moves to the deflecting point (13), a valve of the water tank is opened, the water tank injects water into a steering gear (11) at the front end of the shock wave generating equipment (9) through a booster pump, and the steering gear (11) is connected to the front end of the shock wave generating equipment (9) through a universal joint;
the steering device (11) controls the first flow electromagnetic valve, the second flow electromagnetic valve and/or the third flow electromagnetic valve to act according to preset steering parameters; the first flow solenoid valve controls a first water outlet (12) to spray water with a set flow rate, the second flow solenoid valve controls a second water outlet to spray water with a set flow rate, the third flow solenoid valve controls a third water outlet to spray water with a set flow rate, and the first water outlet (12), the second water outlet and the third water outlet are uniformly distributed in the circumferential direction of the steering gear (11);
the diverter (11) is used for diverting under the action of water sprayed from the first water outlet (12), the second water outlet and/or the third water outlet, the diverter (11) moves into the branch hole (8), and the shock wave generating device (9) continues to be pushed until the shock wave generating device (9) moves to the set shock wave operating point.
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