CN114856529A - Drilling blowout-prevention efficient slag discharging device and using method - Google Patents
Drilling blowout-prevention efficient slag discharging device and using method Download PDFInfo
- Publication number
- CN114856529A CN114856529A CN202210646313.9A CN202210646313A CN114856529A CN 114856529 A CN114856529 A CN 114856529A CN 202210646313 A CN202210646313 A CN 202210646313A CN 114856529 A CN114856529 A CN 114856529A
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- 239000002893 slag Substances 0.000 title claims abstract description 55
- 238000005553 drilling Methods 0.000 title claims abstract description 47
- 238000007599 discharging Methods 0.000 title claims abstract description 24
- 238000000034 method Methods 0.000 title claims abstract description 10
- 239000000428 dust Substances 0.000 claims description 21
- 230000002265 prevention Effects 0.000 claims description 20
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 14
- 238000000605 extraction Methods 0.000 claims description 13
- 238000011010 flushing procedure Methods 0.000 claims description 12
- 239000003245 coal Substances 0.000 claims description 8
- 239000011521 glass Substances 0.000 claims description 7
- 239000007921 spray Substances 0.000 claims description 4
- 239000000843 powder Substances 0.000 claims description 3
- 238000005406 washing Methods 0.000 description 10
- 239000013049 sediment Substances 0.000 description 9
- 238000010276 construction Methods 0.000 description 7
- 238000004140 cleaning Methods 0.000 description 5
- 230000036541 health Effects 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000005086 pumping Methods 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 239000010865 sewage Substances 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK 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
- E21B43/34—Arrangements for separating materials produced by the well
- E21B43/35—Arrangements for separating materials produced by the well specially adapted for separating solids
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D50/00—Combinations of methods or devices for separating particles from gases or vapours
- B01D50/60—Combinations of devices covered by groups B01D46/00 and B01D47/00
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B41/00—Equipment or details not covered by groups E21B15/00 - E21B40/00
- E21B41/005—Waste disposal systems
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK 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
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
- E21B43/18—Repressuring or vacuum methods
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK 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
- E21B43/006—Production of coal-bed methane
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Earth Drilling (AREA)
Abstract
The invention discloses a drilling blowout-preventing high-efficiency slag discharging device and a using method thereof, wherein a first joint is connected with a drilling system through a drilling dry pipe, the lower end of the right side of a box body is connected with a plurality of air inlet joints, the air inlet joints are all connected with an orifice of a drilling machine, the lower end of the left side of the box body is connected with a first slag discharging pipe, the outer side of the first slag discharging pipe is connected with a connecting pipe, the outer side of the connecting pipe is fixedly connected with a first one-way valve, the other end of the connecting pipe is connected with a tank body, the lower end of the right side of the tank body is connected with a second slag discharging pipe, and the outer side of the second slag discharging pipe is fixedly connected with a second one-way valve. The practicability of the device is greatly improved.
Description
Technical Field
The invention relates to drilling and extraction of a coal mine, in particular to a drilling blowout prevention efficient deslagging device and a using method thereof.
Background
The main gas control means of some mines mainly comprises drilling extraction, and along with the continuous increase of the mining depth of the mine, the gas pressure of a coal seam is increased day by day, gas spray holes threaten to exist all the time in the daily drilling construction process, so that the drilling safety is seriously influenced.
The traditional blowout preventer cannot automatically discharge slag, drilling needs to be stopped after the drilling cuttings amount exceeds the volume of the blowout prevention tank, blowout prevention negative pressure is closed to clean, coal passing through a drill hole cannot be continuous, and pressure is easily suppressed in the hole to cause delay spray holes, so that gas is over-limited. Therefore, in order to increase the volume of the tank body, the whole weight of the tank body is over 80 kilograms, the underground transportation and installation are difficult, and multiple persons are required to cooperate; the deslagging and deslagging are mainly performed by regular manual cleaning, the continuous construction of the drill hole is influenced by pumping stop when the cleaning and blowout prevention are performed, and the risk of gas overrun caused by spray holes exists in the process of pumping stop and blowout prevention device cleaning; the situation that cleaning of workers is delayed and blockage of the extraction main pipe is caused incompletely occurs occasionally.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: continuous drilling construction is performed under the condition of ensuring personnel safety.
The invention solves the technical problems through the following technical means: the utility model provides a high-efficient sediment device of blowing out and preventing spouting, box, hose, connecting pipe, jar body, the box includes first joint, first joint is connected with the system of taking out and taking out through taking out the dry pipe, the upper end right side of box is connected with the second joint, the second joint is linked together through hose and jar body, box right side lower extreme is connected with a plurality of air inlet connector, a plurality of air inlet connector all are connected with the rig drill way, the left side lower extreme of box is connected with first scum pipe, the outside of first scum pipe is connected with the connecting pipe, the first check valve of outside fixedly connected with of connecting pipe, the other end of connecting pipe is connected with the jar body, the right side lower extreme of the jar body is connected with second scum pipe, the outside fixedly connected with second check valve of second scum pipe.
This application is connected first joint and drainage system through taking out the dry pipe, make the inner chamber of box take out into the negative pressure, being connected a plurality of air inlet joint and rig drill way, start the rig, make the buggy, gas gets into the inner chamber of box along air inlet joint, through the hose to the box, jar internal chamber carries out negative pressure balance, thereby automatic open or closed first check valve, make the residue pass through the inner chamber of connecting pipe entering jar body from first row's sediment pipe, make its residue discharge into in the ripple through second row's sediment pipe, this device is whole automatic, need not stop taking out manual cleaning, guarantee drilling continuous construction, reduce worker's intensity of labour, guarantee staff's life health.
Preferably: the inner chamber of box is equipped with the filter screen, filter screen slope 15 fixed mounting is in the inner chamber of box.
The advantages are that: used for filtering slag, reducing gas flow speed and dispersing gas flow state.
Preferably: the welding of the inner chamber left side upper end of box has dust device, dust device's one end runs through the inner wall of box and extends to the outside and be connected with high-pressure water pipe, just dust device's shower nozzle corresponds with the filter screen is perpendicular.
The advantages are that: the dust-settling and dust-catching device is used for dust settling and dust catching.
Preferably: the bottom of the inner cavity of the box body is inclined by 15 degrees, and a bottom plate matched with the bottom area of the box body is fixedly installed.
The advantages are that: so that the granulated slag enters the first slag discharging pipe more effectively through the inclined bottom.
Preferably: the inner chamber of box is located the upper end fixedly connected with washing unit of bottom plate, just washing unit's one end extends to the inner wall of box and is connected with high pressure water pipe, just washing unit's front end is installed the washing terminals of a plurality of and corresponding angle.
The advantages are that: used for flushing the air flow entering from the drilling hole opening with high flow speed and large slag.
Preferably: a first observation window made of transparent glass is welded in the middle of the outer side of the box body.
The advantages are that: the staff of being convenient for observes.
Preferably: the right side upper end of the jar body is connected with the grain sediment and connects, the upper end intercommunication of grain sediment joint has the connecting branch pipe, the connecting branch pipe is connected with the hose.
The advantages are that: the negative pressure of the box body and the inner cavity of the hose is effectively balanced.
Preferably: the right side upper end of the jar body is connected with the third and connects, the outside fixedly connected with solenoid valve of third joint.
The advantages are that: the negative pressure of the inner cavity of the tank body is effectively balanced.
Preferably: the upper end fixedly connected with transparent glass material's of jar body second observation window.
The advantages are that: the staff of being convenient for observes.
According to the drilling blowout prevention high-efficiency slag discharging device and the using method thereof, the drilling blowout prevention high-efficiency slag discharging device comprises the following steps: the first connector is connected with an extraction system through an extraction main pipe, the inner cavity of the box body is in negative pressure, the air inlet connectors are connected with the drill hole of the drilling machine, the drilling machine is started, coal powder and gas enter the inner cavity of the box body along the air inlet connectors, the hose balances the negative pressure of the inner cavities of the box body and the tank body, so that the first one-way valve is automatically opened or closed, residues enter the inner cavity of the tank body from the first residue discharge pipe through the connecting pipe, and the second residue discharge pipe is opened through the second one-way valve to discharge the residues into water ripple.
The invention has the advantages that: according to the invention, the first connector is connected with the extraction system through the extraction main pipe, so that the inner cavity of the box body is pumped into negative pressure, the plurality of air inlet connectors are connected with the drill hole of the drilling machine, the drilling machine is started, so that coal powder and gas enter the inner cavity of the box body along the air inlet connectors, the negative pressure balance is carried out on the inner cavities of the box body and the tank body through the hose, and thus the first one-way valve is automatically opened or closed, residues enter the inner cavity of the tank body from the first residue discharge pipe through the connecting pipe, and the residues are discharged into water waves through the second residue discharge pipe;
the inner cavity of the box body is effectively prevented from dust and is caught by arranging the filter screen and the dust falling device in the inner cavity of the box body, so that slag is filtered, and the gas flow speed and the dispersed gas flow state are reduced;
the flushing device is arranged in the inner cavity of the box body, and the flushing nozzle is obliquely arranged to correspond to the direction of the air inlet connector, so that air flow entering from a high-flow-rate large-slag drilling hole is effectively flushed;
a first observation window and a second observation window made of transparent glass materials are arranged on the outer side of the box body and the upper end of the tank body, so that the observation is effectively facilitated for workers; this application simple structure, it is with low costs, safe and reliable need not stop taking out artifical clearance, has guaranteed drilling continuous construction, has improved work efficiency, has reduced worker's intensity of labour, has guaranteed life health safety, has improved the practicality greatly.
Drawings
FIG. 1 is a schematic view of the overall structure of a drilling blowout prevention high-efficiency slag discharge device according to an embodiment of the present invention;
FIG. 2 is an elevational cross-sectional view of a part of the structure of a drilling blowout prevention high-efficiency slag discharge device according to an embodiment of the present invention;
FIG. 3 is an elevational cross-sectional view of a part of the drilling blowout prevention high-efficiency slag discharge device according to the embodiment of the present invention;
fig. 4 is a schematic top sectional view of a partial structure of a drilling blowout prevention high-efficiency slag discharging device according to an embodiment of the invention.
In the figure: 1-a box body; 11-a first joint; 12-a second linker; 13-a dust falling device; 14-a filter screen; 15-a first viewing window; 16-an air inlet joint; 17-a first slag discharge pipe; 18-a base plate; 19-a washing device; 191-a flushing nozzle; 2-a flexible pipe; 3-connecting pipe; 4-a first one-way valve; 5-tank body; 51-granulated slag joint; 511-connecting branch pipes; 52-a second viewing window; 53-third linker; 54-a solenoid valve; 55-a second slag discharge pipe; 56-second check valve.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are some embodiments of the present invention, but not all embodiments. 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.
Referring to fig. 1, the embodiment discloses a drilling blowout prevention high-efficiency slag discharging device, which comprises a box body 1, a hose 2, a connecting pipe 3, a first check valve 4 and a tank body 5.
Referring to fig. 1-2 and 4, the whole box body 1 is of a rectangular structure welded by a steel plate with the thickness of 3mm, the box body 1 comprises a first joint 11, a second joint 12, a dust falling device 13, a filter screen 14, a first observation window 15, an air inlet joint 16, a first slag discharge pipe 17, a bottom plate 18 and a flushing device 19, and the first joint 11 is fixedly connected to the left side of the upper end of the box body 1 and is connected with a far-end extraction system through an extraction dry pipe.
In the embodiment, the box body 1 is opened before construction, pressure is pumped, and the pumping negative pressure is not lower than 13 kPa.
The second connector 12 is fixedly connected to the right side of the upper end of the box body 1, and a negative pressure gauge is installed at the upper end of the second connector 12 and used for observing the pressure condition of the inner cavity of the box body 1.
In this embodiment, the nozzle of the dust falling device 13 vertically corresponds to the filter screen 14.
The air inlet joints 16 are provided with a plurality of air inlet joints, two air inlet joints are arranged at the lower end of the right side of the box body 1 side by side, and one ends of the two air inlet joints 16 are connected with a drilling machine orifice blowout preventer through pipelines.
First row of sediment pipe 17 fixed mounting is at the left side lower extreme of box 1, and bottom plate 18 be with box 1 basal area assorted steel sheet, and the high slope 15 of left side low right side is installed at the inner chamber of box 1, and the low face of bottom plate 18 corresponds with first row of sediment pipe 17, and the high face of bottom plate 18 corresponds with air inlet connector 16, and the effectual residue of being convenient for slides to the inner chamber of first row of sediment pipe 17 along bottom plate 18 surface.
Referring to fig. 1, the flexible pipe 2 is a hose, and one end of the flexible pipe 2 is connected to a second connector 12.
One end of the connecting pipe 3 is connected with the first slag discharging pipe 17, and the outer side of the connecting pipe 3 is fixedly connected with the first one-way valve 4.
Referring to fig. 1 and 3, the tank body 5 is connected with the tank body 1 through the connecting pipe 3, the tank body 5 is integrally of a cylindrical structure, the tank body 5 comprises a grain slag joint 51, a second observation window 52, a third joint 53, an electromagnetic valve 54 and a second slag discharge pipe 55, the grain slag joint 51 is fixedly connected to the upper end of the right side of the tank body 5, the grain slag joint 51 comprises a connecting branch pipe 511, and the connecting branch pipe 511 is connected to the upper end of the grain slag joint 51 and is connected with the other end of the hose 2.
In this embodiment, two ends of the hose 2 are respectively connected with the box body 1 and the tank body 5, and are used for balancing negative pressure in the inner cavities of the box body 1 and the tank body 5.
The second observation window 52 is fixedly arranged at the upper end of the tank body 5, and the second observation window 52 is of a round structure made of transparent glass, so that the workers can observe the inner cavity of the tank body 5 conveniently.
The third joint 53 is fixedly connected to the upper end of the left side of the tank 5, and the end of the third joint 53 is fixedly connected with an electromagnetic valve 54 for outputting 12v safe power to the electromagnetic valve through a power box, so as to balance the pressure in the inner cavity of the tank 5.
The electromagnetic valve 54 is fixedly connected to the lower end of the left side of the tank 5, and the tail end of the electromagnetic valve 54 is fixedly connected with a second one-way valve 56.
In this embodiment, box 1, 5 singlets weights of jar body do not exceed 40 kilograms, are convenient for the staff and transport the installation.
The working principle of the embodiment is as follows: before construction, a worker pumps the box body 1 through the extraction system to enable the interior of the box body to be not lower than 13 kPa, then the dust falling device 13 and the flushing device 19 are opened, the drilling machine is started, coal slag and gas enter the inner cavity of the box body 1 through the air inlet connector 16 and are cleaned through the flushing device 19, the filter screen 14 filters the coal slag, dust falling and trapping of the dust falling device 13 enable the filtered gas to be pumped into the extraction dry pipe, the filtered slag and sewage are driven by water flow and flow into the inner cavity of the tank body 5 through the connecting pipe 3 along with the inclination of the bottom plate 18, the electromagnetic valve 54 at the upper end of the tank body 5 is in a normally closed state, the interior of the tank body 5 is in a negative pressure state, the closing and opening frequency of the electromagnetic valve 54 is adjusted according to the water quantity, the electromagnetic valve 54 is opened, the first one-way valve 4 is closed, and the sewage and the slag are discharged into water ripple through the second slag discharge pipe 55 under the action of gravity, the invention has simple structure and convenient operation, the dust that the in-process produced of drilling can effectively be clear away to accomplish to take out in succession, take out, clear up automatically, both satisfied and prevented spouting the needs, guaranteed again that the pipeline is unblocked constantly, realized drilling prevent spouting dustproof slagging-off multi-functional and integrative, need not artifical clearance, the effectual life health safety who guarantees the staff has improved the practicality of this device greatly.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention 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 solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. The drilling blowout prevention high-efficiency slag discharging device is characterized by comprising a box body (1), a hose (2), a connecting pipe (3) and a tank body (5), wherein the box body (1) comprises a first connector (11), the first connector (11) is connected with a drainage system through a drainage dry pipe, the right side of the upper end of the box body (1) is connected with a second connector (12), the second connector (12) is communicated with the tank body (5) through the hose (2), the lower end of the right side of the box body (1) is connected with a plurality of air inlet connectors (16), the air inlet connectors (16) are all connected with an orifice of a drilling machine, the lower end of the left side of the box body (1) is connected with a first slag discharging pipe (17), the outer side of the first slag discharging pipe (17) is connected with the connecting pipe (3), the outer side of the connecting pipe (3) is fixedly connected with a first one-way valve (4), and the other end of the connecting pipe (3) is connected with the tank body (5), the lower end of the right side of the tank body (5) is connected with a second slag discharge pipe (55), and the outer side of the second slag discharge pipe (55) is fixedly connected with a second one-way valve (56).
2. The drilling blowout-prevention high-efficiency slag discharging device according to claim 1, wherein the inner cavity of the box body (1) is provided with a filter screen (14), and the filter screen (14) is fixedly arranged in the inner cavity of the box body (1) in a 15-degree inclined mode.
3. The drilling blowout prevention high-efficiency slag discharging device according to claim 2, wherein a dust falling device (13) is welded at the upper end of the left side of the inner cavity of the box body (1), one end of the dust falling device (13) penetrates through the inner wall of the box body (1) and extends to the outside to be connected with a high-pressure water pipe, and a spray head of the dust falling device (13) vertically corresponds to the filter screen (14).
4. The drilling blowout-prevention high-efficiency slag discharging device is characterized in that the bottom of an inner cavity of the box body (1) is inclined by 15 degrees, and a bottom plate (18) matched with the bottom area of the box body (1) is fixedly installed.
5. The drilling blowout prevention high-efficiency slag discharging device according to claim 4, wherein the inner cavity of the box body (1) is fixedly connected with a flushing device (19) at the upper end of the bottom plate (18), one end of the flushing device (19) extends to the inner wall of the box body (1) to be connected with a high-pressure water pipe, and a plurality of flushing nozzles (191) with angles corresponding to those of the flushing nozzles (7) are mounted at the front end of the flushing device (19).
6. The drilling blowout-prevention high-efficiency slag discharging device according to claim 1, wherein a first observation window (15) made of transparent glass is welded at the middle position of the outer side of the box body (1).
7. The drilling blowout prevention high-efficiency slag discharging device according to claim 1, wherein a grain slag joint (51) is connected to the upper end of the right side of the tank body (5), a connecting branch pipe (511) is communicated with the upper end of the grain slag joint (51), and the connecting branch pipe (511) is connected with the hose (2).
8. The drilling blowout prevention high-efficiency slag discharging device according to claim 1, wherein a third joint (53) is connected to the upper end of the right side of the tank body (5), and a solenoid valve (54) is fixedly connected to the outer side of the third joint (53).
9. The drilling blowout prevention high-efficiency slag discharge device according to claim 1, wherein a second observation window (52) made of transparent glass is fixedly connected to the upper end of the tank body (5).
10. The use method of the drilling blowout prevention high-efficiency slag discharging device in any one of the claims 1 to 9, the method is characterized by comprising the following steps of connecting the first connector (11) with an extraction system through an extraction main pipe, enabling the inner cavity of the box body (1) to be in negative pressure, connecting a plurality of air inlet connectors (16) with the hole opening of a drilling machine, starting the drilling machine, enabling coal powder and gas to enter the inner cavity of the box body (1) along the air inlet connectors (16), the hose (2) balances the negative pressure in the inner cavities of the box body (1) and the tank body (5) so as to automatically open or close the first one-way valve (4), so that the residue enters the inner cavity of the tank body (5) from the first residue discharge pipe (17) through the connecting pipe (3), and the second slag discharge pipe (55) is opened through the second one-way valve (56), so that the slag is discharged into the water.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210646313.9A CN114856529A (en) | 2022-06-09 | 2022-06-09 | Drilling blowout-prevention efficient slag discharging device and using method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210646313.9A CN114856529A (en) | 2022-06-09 | 2022-06-09 | Drilling blowout-prevention efficient slag discharging device and using method |
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| CN202210646313.9A Pending CN114856529A (en) | 2022-06-09 | 2022-06-09 | Drilling blowout-prevention efficient slag discharging device and using method |
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| CN112709596A (en) * | 2021-01-12 | 2021-04-27 | 中煤科工集团重庆研究院有限公司 | Hydraulic-driven automatic slag discharging device for gas extraction pipeline |
| CN113266298A (en) * | 2021-05-26 | 2021-08-17 | 中煤平朔集团有限公司 | Orifice negative pressure blowout prevention dust fall device and use method thereof |
| CN216197973U (en) * | 2021-10-30 | 2022-04-05 | 山西潞安集团余吾煤业有限责任公司 | Underground drilling gas prevention and control system |
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