CN108915760A - To hole pumping and mining method under a kind of underground coal mine - Google Patents
To hole pumping and mining method under a kind of underground coal mine Download PDFInfo
- Publication number
- CN108915760A CN108915760A CN201810778481.7A CN201810778481A CN108915760A CN 108915760 A CN108915760 A CN 108915760A CN 201810778481 A CN201810778481 A CN 201810778481A CN 108915760 A CN108915760 A CN 108915760A
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- drilling
- hole
- water
- drilling rod
- close
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- 239000003245 coal Substances 0.000 title claims abstract description 37
- 238000005086 pumping Methods 0.000 title claims abstract description 23
- 238000000034 method Methods 0.000 title claims abstract description 22
- 238000005065 mining Methods 0.000 title claims abstract description 16
- 238000005553 drilling Methods 0.000 claims abstract description 116
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 56
- 238000007789 sealing Methods 0.000 claims abstract description 44
- 238000000605 extraction Methods 0.000 claims abstract description 37
- 238000002347 injection Methods 0.000 claims abstract description 24
- 239000007924 injection Substances 0.000 claims abstract description 24
- 238000007664 blowing Methods 0.000 claims abstract description 21
- 239000002893 slag Substances 0.000 claims abstract description 17
- 238000010276 construction Methods 0.000 claims abstract description 9
- 238000009825 accumulation Methods 0.000 claims abstract description 5
- 238000007569 slipcasting Methods 0.000 claims description 9
- 238000005452 bending Methods 0.000 claims description 8
- 238000004880 explosion Methods 0.000 claims description 7
- 210000002966 serum Anatomy 0.000 claims description 6
- 239000002002 slurry Substances 0.000 claims description 6
- 238000007599 discharging Methods 0.000 claims description 4
- 239000003795 chemical substances by application Substances 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 230000000694 effects Effects 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001727 in vivo Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000000243 solution Substances 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
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
-
- 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
- E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
- E21B21/16—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor using gaseous fluids
-
- 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
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices or the like
-
- 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
-
- 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
- E21B43/02—Subsoil filtering
- E21B43/10—Setting of casings, screens, liners or the like in wells
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- Earth Drilling (AREA)
Abstract
The invention discloses under a kind of underground coal mine to hole pumping and mining method, extraction borehole construction in place after out of drilling rod tripping in extraction screen casing, water pipe is blown to drilling bottom, using bag type paste injection hole sealing device, grouting with pressure, ensure the tightness of drilling and sealing, it is installed in the water-blowing device that drilling orifice blows water pipe one end simultaneously, using pressure wind pressure by extraction borehole internal water accumulation, slag is blown out outside hole, it can be effectively external by the coal petrography slag discharge drilling in drilling, ensure that the extracting result of subsequent gas is good, it solves traditional gas pumping method and is easy collapse hole to drilling there is lower, sealing of hole imprecision, water deposits slag in drilling, the problem of influencing gas pumping effect, improve gas drainage efficiency, shorten the gas drainage under suction time, realize safety in production.
Description
Technical field
The present invention relates under coal mining security technology area more particularly to a kind of underground coal mine to hole pumping and mining method.
Background technique
Gas Outburst is the safety accident being easy to appear during coal mine produces, and the high concentration gas that coal and gas prominent can be gushed out is met
Fire source causes the disasters such as gas combustion and explosion and occurs, in this case it is necessary to which underground coal mine gas drainage outstanding is gone out
Come, it is ensured that the safety of personnel and equipment, to drilling, to be easy collapse hole, sealing of hole not tight there is lower for traditional gas pumping method at present
The problem of close, the interior water that drills deposits slag, influences extracting result, it is therefore desirable to propose to take out under the novel underground coal mine of one kind to drilling
Mining method improves gas drainage efficiency, shortens gas drainage under suction for overcoming defect existing for traditional gas pumping method and deficiency
Time realizes safety in production.
Summary of the invention
Present invention solves the technical problem that：It provides under a kind of underground coal mine to hole pumping and mining method, it is traditional to solve
Gas pumping method is easy that collapse hole, sealing of hole imprecision, water deposits slag in drilling to drilling there is lower, influences gas pumping effect
The problem of.
Technical solution of the present invention：
To hole pumping and mining method under a kind of underground coal mine, include the following steps：
Step 1：Drilling construction is carried out in coal seam using drilling rod；
Step 2：After drilling construction, drilling rod is extracted out 0.9m-1.1m from inside to outside from drilling, by drilling rod close to drilling orifice
End and drilling rod ontology disconnect；
Step 3：Water pipe will be blown to be arranged inside extraction screen casing, bottom hole fixed frame will be connect with extraction screen casing one end；
Step 4：Extraction screen casing is equipped with one end of bottom hole fixed frame from the drilling rod ontology gap described in step 2 along drilling rod sheet
The position apart from bottom hole 1m is gradually extended in vivo；
Step 5：The open and close type drill bit of drilling rod front end is opened and is entered in drilling by bottom hole fixed frame, the expansion of bottom hole fixed frame, Gu
It is scheduled on drilling coal wall；
Step 6：Drilling rod is attached with drilling rod ontology again close to the end of drilling orifice, then by drilling rod ontology and opening and closing
Formula drill bit takes out drilling completely；
Step 7：Extraction screen casing is connect close to one end of drilling orifice with the hole sealing tube of diameter 50mm；
Step 8：Sealing of hole is carried out using bag type paste injection hole sealing device；
Step 9：Water-blowing device is connected close to drilling orifice one end blowing water pipe, utilizes high pressure water flow and the distinguished and admirable inner product that will drill
Water, the blowout drilling of coal petrography slag are external.
Water pipe will be blown described in step 3 to be arranged inside extraction screen casing, and bottom hole fixed frame will be connect with extraction screen casing one end,
Described to blow that length of pipe is longer than extraction screen casing, the water pipe diameter that blows is 16mm, and the extraction screen casing diameter is 32mm.
The open and close type drill bit of drilling rod front end is opened and is entered in drilling by bottom hole fixed frame described in step 5, and bottom hole is fixed
Frame expansion is fixed on drilling coal wall, and the open and close type drill bit is three wings open and close type drill bit.
Sealing of hole is carried out using bag type paste injection hole sealing device described in step 8, it is further comprising the steps of：
Step 8.1：In the mixed serum injection hole that rapid hardening is expanded to hole sealing agent and water using Pneumatic grouting pump, the mixing of injection
Slurries are introduced into the pouch at bag type paste injection hole sealing device both ends, achieve the purpose that sealing drilling both ends；
Step 8.2：Explosion valve when grouting pressure reaches 0.8-1.2Mpa, on the grouting pipeline of bag type paste injection hole sealing device
Automatic-explosion, mixed serum effectively fill the crack around drilling；
Step 8.3：When the return pipe of bag type paste injection hole sealing device returns back out muddy slurries, suspend continuation slip casting in one minute；
Step 8.4：When grouting pressure reaches 0.8MPa or slip casting operating number reaches five times, stops slip casting, drill at this time
Interior crack sufficiently blocks.
Water pipe is being blown close to drilling orifice one end connection water-blowing device described in step 9, utilizes high pressure water flow and distinguished and admirable general
Drill internal water accumulation, coal petrography slag blowout drilling outside, and the water-blowing device includes blowing hydrophone and tube body, is arranged on the tube body
Have a high-pressure hose connector and drainpipe, at the top of the high-pressure hose connector with blow hydrophone and connect, the high-pressure hose connector
Bottom is connected to the bending tube for setting in tubular body, and the bending tube other end is connect with water pipe thread is blown, the tube body
Both ends are threadedly coupled with the extraction shelf of hole sealing tube and outside respectively, are additionally provided with water discharging valve on the drainpipe.
Beneficial effects of the present invention：It provides to hole pumping and mining method under a kind of underground coal mine, after extraction borehole construction in place
Out of drilling rod tripping in extraction screen casing, blow water pipe to drilling bottom, using bag type paste injection hole sealing device, grouting with pressure, it is ensured that drilling envelope
The tightness in hole, while being installed in the water-blowing device that drilling orifice blows water pipe one end, using pressure wind pressure by extraction borehole inner product
It, can be effectively external by the coal petrography slag discharge drilling in drilling, it is ensured that the extracting result of subsequent gas is good outside water, slag blowout hole
It is good, it solves traditional gas pumping method there is lower and is easy that collapse hole, sealing of hole imprecision, water deposits slag in drilling to drilling,
The problem of influencing gas pumping effect, improves gas drainage efficiency, shortens the gas drainage under suction time, realizes safety in production.
Detailed description of the invention
Fig. 1 is flow chart of the present invention；
Fig. 2 is drainage device connection schematic diagram of the present invention；
Fig. 3 is water-blowing device pipe structure schematic diagram；
It is identified in figure：1, drilling rod, 2, open and close type drill bit, 3, bottom hole fixed frame, 4, extraction screen casing, 5, hole sealing tube, 6, blow water pipe, 7,
Tube body, 8, high-pressure hose connector, 9, discharge outlet, 10, bending tube.
Specific embodiment
To hole pumping and mining method under a kind of underground coal mine, include the following steps：
Step 1：Drilling construction is carried out in coal seam using drilling rod 1；
Step 2：After drilling construction, drilling rod 1 is extracted out 0.9m-1.1m from inside to outside from drilling, by drilling rod 1 close to drilling orifice
End and 1 ontology of drilling rod disconnect；
Step 3：Water pipe 6 will be blown to be arranged inside extraction screen casing 4, bottom hole fixed frame 3 will be connect with 4 one end of extraction screen casing；
Step 4：One end that extraction screen casing 4 is equipped with bottom hole fixed frame 3 is bored from the 1 ontology gap edge of drilling rod described in step 2
The position apart from bottom hole 1m is gradually extended in 1 ontology of bar；
Step 5：The open and close type drill bit 2 of 1 front end of drilling rod is opened and is entered in drilling by bottom hole fixed frame 3, and bottom hole fixed frame 3 is opened up
It opens, is fixed on drilling coal wall；
Step 6：Drilling rod 1 is attached with 1 ontology of drilling rod again close to the end of drilling orifice, then by 1 ontology of drilling rod and
Open and close type drill bit 2 takes out drilling completely；
Step 7：Extraction screen casing 4 is connect close to one end of drilling orifice with the hole sealing tube 5 of diameter 50mm；
Step 8：Sealing of hole is carried out using bag type paste injection hole sealing device；
Step 9：Water-blowing device is connected close to drilling orifice one end blowing water pipe 6, utilizes high pressure water flow and the distinguished and admirable inner product that will drill
Water, the blowout drilling of coal petrography slag are external.
Water pipe 6 will be blown described in step 3 to be arranged inside extraction screen casing 4, by bottom hole fixed frame 3 and 4 one end of extraction screen casing
Connection, 6 diameter of water pipe that blows is 16mm, and 4 diameter of extraction screen casing is 32mm.
The open and close type drill bit 2 of 1 front end of drilling rod is opened and is entered in drilling by bottom hole fixed frame 3 described in step 5, and bottom hole is solid
Determine the expansion of frame 3, be fixed on drilling coal wall, the open and close type drill bit 2 is three wings open and close type drill bit.
Sealing of hole is carried out using bag type paste injection hole sealing device described in step 8, it is further comprising the steps of：
Step 8.1：In the mixed serum injection hole that rapid hardening is expanded to hole sealing agent and water using Pneumatic grouting pump, the mixing of injection
Slurries are introduced into the pouch at bag type paste injection hole sealing device both ends, achieve the purpose that sealing drilling both ends；
Step 8.2：Explosion valve when grouting pressure reaches 0.8-1.2Mpa, on the grouting pipeline of bag type paste injection hole sealing device
Automatic-explosion, mixed serum effectively fill the crack around drilling；
Step 8.3：When the return pipe of bag type paste injection hole sealing device returns back out muddy slurries, suspend continuation slip casting in one minute；
Step 8.4：When grouting pressure reaches 0.8MPa or slip casting operating number reaches five times, stops slip casting, drill at this time
Interior crack sufficiently blocks.
Water pipe 6 is being blown close to drilling orifice one end connection water-blowing device described in step 9, utilizes high pressure water flow and distinguished and admirable general
Drill internal water accumulation, coal petrography slag blowout drilling outside, and the water-blowing device includes blowing hydrophone and tube body 7, is set on the tube body 7
Be equipped with high-pressure hose connector 8 and drainpipe 9,8 top of high-pressure hose connector with blow hydrophone and connect, the high-pressure hose
8 bottom of connector is connected to the bending tube 10 set inside tube body 7, and 10 other end of bending tube is threadedly coupled with water pipe 6 is blown,
7 both ends of tube body are threadedly coupled with the extraction shelf of hole sealing tube 5 and outside respectively, are additionally provided on the drainpipe 9
Water discharging valve when blowing water, closes the valve that external extraction shelf is connect with current divider, opens the water discharging valve on drainpipe 9,
It opens and blows hydrophone with what high-pressure hose connector 8 was connect, enter pressure wind by high-pressure hose connector 8, bending tube 10 and blow water pipe 6,
Water is blown out in drilling, and the water in drilling is discharged through drainage hole 9, and extraction shelf of the small part aqueous vapor outside enters air water point
Device is flowed, is discharged from tailrace.
The present invention is provided to hole pumping and mining method under a kind of underground coal mine, after extraction borehole construction in place out of drilling rod 1 under
Enter extraction screen casing 4, blow water pipe 6 to drilling bottom, using bag type paste injection hole sealing device, grouting with pressure, it is ensured that drilling and sealing it is tight
Property, while it being installed in the water-blowing device that drilling orifice blows 6 one end of water pipe, extraction borehole internal water accumulation, slag are blown using pressure wind pressure
Portal outer, it can be effectively external by the coal petrography slag discharge drilling in drilling, it is ensured that the extracting result of subsequent gas is good, solves
Traditional gas pumping method is easy that collapse hole, sealing of hole imprecision, water deposits slag in drilling to drilling there is lower, influences gas
The problem of extracting result, improves gas drainage efficiency, shortens the gas drainage under suction time, realizes safety in production.
Claims (5)
1. to hole pumping and mining method under a kind of underground coal mine, it is characterised in that：Include the following steps：
Step 1：Using drilling rod（1）Drilling construction is carried out in coal seam；
Step 2：After drilling construction, by drilling rod（1）0.9m-1.1m is extracted out from inside to outside from drilling, by drilling rod（1）Close to drilling
The end in aperture and drilling rod（1）Ontology disconnects；
Step 3：Water pipe will be blown（6）It is arranged in extraction screen casing（4）Inside, by bottom hole fixed frame（3）With extraction screen casing（4）One end connects
It connects；
Step 4：By extraction screen casing（4）Bottom hole fixed frame is installed（3）One end from the drilling rod described in step 2（1）Ontology disconnects
Place is along drilling rod（1）The position apart from bottom hole 1m is gradually extended in ontology；
Step 5：Bottom hole fixed frame（3）By drilling rod（1）The open and close type drill bit of front end（2）It opens and enters in drilling, bottom hole is fixed
Frame（3）Expansion is fixed on drilling coal wall；
Step 6：By drilling rod（1）Close to drilling orifice end again with drilling rod（1）Ontology is attached, then by drilling rod（1）
And open and close type drill bit（2）Drilling is taken out completely；
Step 7：By extraction screen casing（4）Close to one end of drilling orifice and the hole sealing tube of diameter 50mm（5）Connection；
Step 8：Sealing of hole is carried out using bag type paste injection hole sealing device；
Step 9：Blowing water pipe（6）Close to drilling orifice one end connect water-blowing device, using high pressure water flow and it is distinguished and admirable will drilling in
Ponding, the blowout drilling of coal petrography slag are external.
2. to hole pumping and mining method under a kind of underground coal mine according to claim 1, it is characterised in that：Described in step 3
Water pipe will be blown（6）It is arranged in extraction screen casing（4）Inside, by bottom hole fixed frame（3）With extraction screen casing（4）One end connection, it is described
Blow water pipe（6）Diameter is 16mm, the extraction screen casing（4）Diameter is 32mm.
3. to hole pumping and mining method under a kind of underground coal mine according to claim 1, it is characterised in that：Bottom hole fixed frame
（3）By drilling rod（1）The open and close type drill bit of front end（2）It opens and enters in drilling, bottom hole fixed frame（3）Expansion, is fixed on drilling
On coal wall, the open and close type drill bit（2）For three wings open and close type drill bit（2）.
4. to hole pumping and mining method under a kind of underground coal mine according to claim 1, it is characterised in that：Described in step 8
Sealing of hole is carried out using bag type paste injection hole sealing device, it is further comprising the steps of：
Step 8.1：In the mixed serum injection hole that rapid hardening is expanded to hole sealing agent and water using Pneumatic grouting pump, the mixing of injection
Slurries are introduced into the pouch at bag type paste injection hole sealing device both ends, achieve the purpose that sealing drilling both ends；
Step 8.2：Explosion valve when grouting pressure reaches 0.8-1.2Mpa, on the grouting pipeline of bag type paste injection hole sealing device
Automatic-explosion, mixed serum effectively fill the crack around drilling；
Step 8.3：When the return pipe of bag type paste injection hole sealing device returns back out muddy slurries, suspend continuation slip casting in one minute；
Step 8.4：When grouting pressure reaches 0.8MPa or slip casting operating number reaches five times, stops slip casting, drill at this time
Interior crack sufficiently blocks.
5. to hole pumping and mining method under a kind of underground coal mine according to claim 1, it is characterised in that：Described in step 9
Blowing water pipe（6）Water-blowing device is connected close to drilling orifice one end, utilizes high pressure water flow and the distinguished and admirable internal water accumulation, coal petrography slag of drilling
Blowout drilling is external, and the water-blowing device includes blowing hydrophone and tube body（7）, the tube body（7）On be provided with high-pressure hose
Connector（8）And drainpipe（9）, the high-pressure hose connector（8）Top is connect with hydrophone is blown, the high-pressure hose connector
（8）It bottom and sets in tube body（7）Internal bending tube（10）Connection, the bending tube（10）The other end and blow water pipe（6）Spiral shell
Line connection, the tube body（7）Both ends respectively with hole sealing tube（5）And external extraction shelf is threadedly coupled, the drainpipe
（9）On be additionally provided with water discharging valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810778481.7A CN108915760A (en) | 2018-07-16 | 2018-07-16 | To hole pumping and mining method under a kind of underground coal mine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810778481.7A CN108915760A (en) | 2018-07-16 | 2018-07-16 | To hole pumping and mining method under a kind of underground coal mine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108915760A true CN108915760A (en) | 2018-11-30 |
Family
ID=64412172
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810778481.7A Pending CN108915760A (en) | 2018-07-16 | 2018-07-16 | To hole pumping and mining method under a kind of underground coal mine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108915760A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110030033A (en) * | 2019-04-08 | 2019-07-19 | 贵州盘江精煤股份有限公司 | Gas drainage pipe length-measuring appliance in a kind of drilling |
| CN110173231A (en) * | 2019-07-08 | 2019-08-27 | 中煤科工集团重庆研究院有限公司 | Long-distance downward drilling segmented compact hole sealing pressure measuring device and method |
| CN116066169A (en) * | 2023-03-10 | 2023-05-05 | 国家能源集团乌海能源有限责任公司 | Gas extraction device and gas extraction method |
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| CN102747953A (en) * | 2012-03-06 | 2012-10-24 | 中国矿业大学 | Multiple step type drilling and protecting integrated system and process for soft coal seam |
| CN103089293A (en) * | 2011-10-28 | 2013-05-08 | 淮南矿业(集团)有限责任公司 | Slag removal unit |
| CN103470297A (en) * | 2013-09-10 | 2013-12-25 | 湖南省煤炭科学研究所 | Drilling, pumping and discharging integrated coal seam pressure relief and permeability improvement device and using method thereof |
| CN104481580A (en) * | 2014-12-23 | 2015-04-01 | 河南理工大学 | Method and device for repairing downhole coal-bed gas extraction drilled hole |
| CN105298391A (en) * | 2015-12-01 | 2016-02-03 | 河南焦煤能源有限公司科学技术研究所 | Drilling-punching integral construction method for gas extraction drill hole |
| CN105696967A (en) * | 2016-01-21 | 2016-06-22 | 淮南久辉工贸有限责任公司 | Mining hole packer and hole packing method |
| CN106869989A (en) * | 2017-02-23 | 2017-06-20 | 山西晋城无烟煤矿业集团有限责任公司 | A kind of underground coal mine continuous screen manages and protects hole method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103089293A (en) * | 2011-10-28 | 2013-05-08 | 淮南矿业(集团)有限责任公司 | Slag removal unit |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110030033A (en) * | 2019-04-08 | 2019-07-19 | 贵州盘江精煤股份有限公司 | Gas drainage pipe length-measuring appliance in a kind of drilling |
| CN110173231A (en) * | 2019-07-08 | 2019-08-27 | 中煤科工集团重庆研究院有限公司 | Long-distance downward drilling segmented compact hole sealing pressure measuring device and method |
| CN116066169A (en) * | 2023-03-10 | 2023-05-05 | 国家能源集团乌海能源有限责任公司 | Gas extraction device and gas extraction method |
| CN116066169B (en) * | 2023-03-10 | 2024-03-26 | 国家能源集团乌海能源有限责任公司 | Gas extraction device and gas extraction method |
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Application publication date: 20181130 |