CN108868875A - A kind of secondary grouting gas hole sealing device with pressure and its construction method - Google Patents
A kind of secondary grouting gas hole sealing device with pressure and its construction method Download PDFInfo
- Publication number
- CN108868875A CN108868875A CN201810919312.0A CN201810919312A CN108868875A CN 108868875 A CN108868875 A CN 108868875A CN 201810919312 A CN201810919312 A CN 201810919312A CN 108868875 A CN108868875 A CN 108868875A
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- grouting
- valve
- grouting pipe
- pipe
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- 238000007789 sealing Methods 0.000 title claims abstract description 62
- 238000010276 construction Methods 0.000 title claims abstract description 9
- 239000002360 explosive Substances 0.000 claims abstract description 19
- 238000007569 slipcasting Methods 0.000 claims description 24
- 239000000463 material Substances 0.000 claims description 23
- 238000000605 extraction Methods 0.000 claims description 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 9
- 238000005054 agglomeration Methods 0.000 claims description 6
- 230000002776 aggregation Effects 0.000 claims description 6
- 239000003795 chemical substances by application Substances 0.000 claims description 6
- 230000010410 reperfusion Effects 0.000 claims description 5
- 230000000694 effects Effects 0.000 claims description 3
- 239000004744 fabric Substances 0.000 claims description 3
- 239000000835 fiber Substances 0.000 claims description 2
- 239000002002 slurry Substances 0.000 claims description 2
- 238000004880 explosion Methods 0.000 claims 1
- 238000002347 injection Methods 0.000 description 9
- 239000007924 injection Substances 0.000 description 9
- 238000005553 drilling Methods 0.000 description 7
- 239000012141 concentrate Substances 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- 238000005086 pumping Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000010009 beating Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000002775 capsule Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 239000011440 grout Substances 0.000 description 1
- 238000007689 inspection Methods 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
- 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
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)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Abstract
The present invention relates to a kind of secondary grouting gas hole sealing device with pressure and its construction methods,Including the pouch one sequentially passed through,The Grouting Pipe one and hole sealing tube of pouch two and pouch three,The first grouting pump of one end detachable connection of Grouting Pipe one,The other end of Grouting Pipe one sets plug one,Grouting Pipe one and pouch two,Valve two and valve one are set in the superposition section of pouch three respectively,The outlet of valve two and valve one is respectively provided at pouch two,In pouch three,Explosive valve two is set in Grouting Pipe one between pouch two and pouch three,Grouting Pipe two is equipped in pouch one and pouch two,The second grouting pump of one end detachable connection of Grouting Pipe two,The other end of Grouting Pipe two sets plug two,Filter is set in Grouting Pipe two between plug two and pouch two,Explosive valve one is set in Grouting Pipe two between pouch two and pouch one,Grouting Pipe two and pouch one,Valve three and valve four are set in the superposition section of pouch two respectively,The outlet of valve three and valve four is respectively provided at pouch one,In pouch two.
Description
Technical field
The invention belongs to gas drainage technical fields, and in particular to a kind of secondary grouting gas hole sealing device with pressure and its apply
Work method.
Background technique
During gas drainage, carry out injection hole sealing is generally required to mash gas pumping drilling single hole, prevents gas from revealing, into
After the effective sealing of hole of row, grid-connected progress negative pressure extraction concentration can achieve maximum value 80%, which increases with the extraction time will gradually
Decaying, occur in a short time concentration decline it is violent when, illustrate that sealing section new crack occurs and leads to pressure of leaking out, leak, and traditional gas
Injection hole sealing technique can not block new crack because grout material has solidified.
Summary of the invention
In view of this, the present invention provides a kind of secondary grouting gas hole sealing device with pressure and its construction methods, to solve
Deficiency certainly in the prior art.
The technical scheme is that：
A kind of secondary grouting gas hole sealing device with pressure, including Grouting Pipe disposed in parallel one and hole sealing tube, the slip casting
Pipe one and hole sealing tube sequentially pass through tactic pouch one, pouch two and pouch three, and one end of the Grouting Pipe one is detachable
Formula connects the first grouting pump, and the other end of the Grouting Pipe one is provided with plug one, the Grouting Pipe one and pouch two, pouch three
Superposition section on be respectively arranged with valve two and valve one, the outlet of the valve two and valve one be separately positioned on pouch two,
In pouch three, explosive valve two, the pouch one and pouch two are provided in the Grouting Pipe one between the pouch two and pouch three
On be also equipped with Grouting Pipe two, the second grouting pump of one end detachable connection of the Grouting Pipe two, the Grouting Pipe two it is another
One end is provided with plug two, and filter, two He of pouch are provided in the Grouting Pipe two between the plug two and pouch two
It is provided with explosive valve one in Grouting Pipe two between pouch one, divides in the Grouting Pipe two and pouch one, the superposition section of pouch two
It is not provided with valve three and valve four, the outlet of the valve three and valve four is separately positioned on pouch one, in pouch two.
Preferably, the hole sealing tube is pvc pipe.
Preferably, the pouch one, pouch two, the material of pouch three are the antistatic high-density fiber cloth of high-elastic wear-resistant
Material.
Preferably, the pouch one, pouch two and pouch three are cylindrical, and pouch one, pouch two and pouch three it is outer
The diameter matches of diameter and mash gas pumping drilling, the diameter matches of the pouch one, the internal diameter of pouch two and pouch three and hole sealing tube,
The long 0.8m of pouch of the pouch one and pouch three, the long 1.2m of the pouch of pouch two.
A kind of construction method of secondary grouting gas hole sealing device with pressure, includes the following steps：
S1, each sealing of hole is sequentially connected with pouch, is sent slowly to gas extraction hole, aperture is away from 1.5 meters of pouch；
S2, for the first time slip casting：
S21, material mixing agitator is opened, hole sealing agent and water is pressed 1:1 is evenly stirred until no agglomeration；
S22, the first grouting pump is connect with the air line of Grouting Pipe one and 0.4Mpa--0.7Mpa respectively, opens first
Grouting pump starts switch, and function key is then adjusted at the uniform velocity slow open state, observes the first grouting pump suction situation, to check the
Whether one grouting pump and grouting Grouting Pipe one are unobstructed；
S23, the first grouting pump and grouting Grouting Pipe one it is unobstructed in the case where start slip casting for the first time, pouch two and pouch three
It is discharged respectively by valve two and valve one, pouring material is gradually propped up and infuses real pouch two and pouch three, Grouting Pipe one
Explosive valve two is opened when interior pressure reaches 0.6-0.8Mpa, and pouring material is through explosive valve two toward between pouch two and pouch three
Interlude reperfusion serosity, secondary grouting pipeline can be by filter as drainage tracheae, by water extra in hole during this period
It is discharged with air, has optimal dense effect to reach the interlude of pouch two and pouch three, reached in the pressure of the first grouting pump
Stop slip casting when to 1.2Mpa, slip casting for the first time is completed；
S3, secondary grouting：
S31, material mixing agitator is opened, hole sealing agent and water is pressed 1:1 is evenly stirred until no agglomeration；
S32, the second grouting pump is connect with the air line of Grouting Pipe two and 0.4Mpa--0.7Mpa respectively, beating slowly
Starting switch for the second grouting pump is opened, function key is then adjusted at the uniform velocity slow open state, observes the second grouting pump suction situation, with
Check whether the second grouting pump and grouting Grouting Pipe two are unobstructed；
S33, the second grouting pump and grouting Grouting Pipe two it is unobstructed in the case where start secondary grouting, pouch one passes through valve
Three discharge, and pouring material gradually props up pouch and infuses reality together, and filter can be filled up by secondary grouting during this slip casting
The crack that pouch two and three interlude of pouch regenerate, the pressure in Grouting Pipe two is when reaching 0.6-0.8Mpa, explosive valve
One open, pouring material through explosive valve one toward the interlude reperfusion serosity between pouch one and pouch two, in the second grouting pump
Pressure stops slip casting when reaching 1.2Mpa, secondary grouting is completed.
The present invention makes extraction borehole single hole carry out secondary grouting, realizes two by using three pouches, two sets of grouting pipelines
Secondary sealing of hole second lift gas extraction concentration.The hole sealing device reaches for the first time effectively envelope by first time early period injection hole sealing
Hole, at this moment grid-connected progress negative pressure extraction concentration reaches maximum value 80%, which increases with the extraction time and will gradually decay, positive reason
Decayed under condition with the slow-decay state of the 5-10% that monthly decays, if but occur in a short time with monthly decay 30% concentration it is strong
Decaying illustrates that sealing section new crack occurs and leads to pressure generation of leaking out, leak, and negative pressure value reduces in hole, and it is dense that expection is not achieved in gas
Degree can not be extracted out normally, be directly connected to grouting pump using secondary grouting hole-sealing technology at this time and carry out secondary grouting, realize secondary
Sealing of hole achievees the purpose that second lift drilling concentration.
The present invention provides a kind of secondary grouting gas hole sealing device with pressure and its construction methods, compared with prior art,
It is with following beneficial effect：
1, it is provided with filter in Grouting Pipe two of the invention, can is first time injection hole sealing drainage exhaust, solves
Extra aqueous vapor occupies the phenomenon that slip casting space, so that first time injection hole sealing is more densely cross-linked.
2, present invention the case where being decayed according to gas density, can slip casting concentrate at any time, solve the difficulty of gas density decaying
Topic, realizes the secondary hole sealing of the single hole during gas drainage, secondary concentrate.
3, shadow of the secondary interstice that pressure redistribution generates when the present invention efficiently solves Completion of Drilling Hole to extraction concentration
It rings.
4, operation of the present invention is simple, and practicability is good, is worthy to be popularized.
Detailed description of the invention
Fig. 1 is integrally-built schematic diagram of the invention.
Specific embodiment
The present invention provides a kind of secondary grouting gas hole sealing device with pressure and its construction methods, below with reference to the knot of Fig. 1
Structure schematic diagram, the present invention will be described.
As shown in Figure 1, a kind of secondary grouting gas hole sealing device with pressure provided by the invention, including slip casting disposed in parallel
Pipe 1 and hole sealing tube 3, the Grouting Pipe 1 and hole sealing tube 3 sequentially pass through tactic pouch 1, pouch 25 and pouch
38, the first grouting pump of one end detachable connection 4 of the Grouting Pipe 1, the other end of the Grouting Pipe 1 is provided with stifled
First 10, valve 26 and valve 1, institute are respectively arranged in the Grouting Pipe 1 and pouch 25, the superposition section of pouch 38
The outlet for stating valve 26 and valve 1 is separately positioned on pouch 25, in pouch 38, between the pouch 25 and pouch 38
Grouting Pipe 1 on be provided with explosive valve 27, Grouting Pipe 2 16, the note are also equipped in the pouch 1 and pouch 25
The second grouting pump of one end detachable connection 17 of pipe 2 16 is starched, the other end of the Grouting Pipe 2 16 is provided with plug 2 11,
Be provided with filter 12 in Grouting Pipe 2 16 between the plug 2 11 and pouch 25, the pouch 25 and pouch 1 it
Between Grouting Pipe 2 16 on be provided with explosive valve 1, the Grouting Pipe 2 16 in pouch 1, the superposition section of pouch 25 points
It is not provided with valve 3 15 and valve 4 13, the outlet of the valve 3 15 and valve 4 13 is separately positioned on pouch 1, pouch
In 25.
Further, the hole sealing tube 3 is pvc pipe.
Further, the pouch 1, pouch 25, the material of pouch 38 are that the antistatic high density of high-elastic wear-resistant is fine
Tie up cloth.
Further, the pouch 1, pouch 25 and pouch 38 are cylindrical, and pouch 1, pouch 25 and pouch
38 outer diameter and the diameter matches of mash gas pumping drilling, the internal diameter and hole sealing tube 3 of the pouch 1, pouch 25 and pouch 38
Diameter matches, the long 0.8m of pouch of the pouch 1 and pouch 38, the long 1.2m of the pouch of pouch 25.
A kind of construction method of secondary grouting gas hole sealing device with pressure provided by the invention, includes the following steps：
S1, each sealing of hole is sequentially connected with pouch, is sent slowly to gas extraction hole, aperture is away from 1.5 meters of pouch；
S2, for the first time slip casting：
S21, material mixing agitator is opened, hole sealing agent and water is pressed 1:1 is evenly stirred until no agglomeration；
S22, the first grouting pump 4 is connect with the air line of Grouting Pipe 1 and 0.4Mpa--0.7Mpa respectively, opens the
One grouting pump 4 starts switch, and function key is then adjusted at the uniform velocity slow open state, observes 4 suction situation of the first grouting pump, with inspection
It looks into the first grouting pump 4 and whether grouting Grouting Pipe 1 is unobstructed；
S23, the first grouting pump 4 and grouting Grouting Pipe 1 it is unobstructed in the case where start slip casting for the first time, pouch 25 and capsule
Bag 38 is discharged by valve 26 and valve 1 respectively, and real pouch 25 and pouch 38 are gradually propped up and infused to pouring material,
Explosive valve 27 is opened when pressure in Grouting Pipe 1 reaches 0.6-0.8Mpa, and pouring material is through explosive valve 27 toward 25 He of pouch
Interlude reperfusion serosity between pouch 38, secondary grouting pipeline 16 can be used as drainage exhaust by filter 12 during this period
Water and air extra in hole is discharged, has optimal dense effect to reach the interlude of pouch 25 and pouch 38 by pipe,
The pressure of first grouting pump 4 stops slip casting when reaching 1.2Mpa, and slip casting for the first time is completed；
S3, secondary grouting：
S31, material mixing agitator is opened, hole sealing agent and water is pressed 1:1 is evenly stirred until no agglomeration；
S32, the second grouting pump 17 is connect with the air line of Grouting Pipe 2 16 and 0.4Mpa--0.7Mpa respectively, is opened
Second grouting pump 17 starts switch, and function key is then adjusted at the uniform velocity slow open state, observes 17 suction situation of the second grouting pump,
To check whether the second grouting pump 17 and grouting Grouting Pipe 2 16 are unobstructed；
S33, the second grouting pump 17 and grouting Grouting Pipe 2 16 it is unobstructed in the case where start secondary grouting, pouch 1 is logical
It crosses valve 3 15 to discharge, pouring material gradually props up pouch 1 and infuses reality, and filter 12 can pass through two during this slip casting
The crack that pouch 25 is filled up in secondary slip casting and 38 interlude of pouch regenerates, the pressure in Grouting Pipe 2 16 are reaching 0.6-
When 0.8Mpa, explosive valve 1 is opened, and pouring material is filled through explosive valve 1 toward the interlude between pouch 1 and pouch 25
Injection slurry, stops slip casting when the pressure of the second grouting pump 17 reaches 1.2Mpa, and secondary grouting is completed.
The present invention makes extraction borehole single hole carry out secondary grouting, realizes two by using three pouches, two sets of grouting pipelines
Secondary sealing of hole second lift gas extraction concentration.The hole sealing device reaches for the first time effectively envelope by first time early period injection hole sealing
Hole, at this moment grid-connected progress negative pressure extraction concentration reaches maximum value 80%, which increases with the extraction time and will gradually decay, positive reason
Decayed under condition with the slow-decay state of the 5-10% that monthly decays, if but occur in a short time with monthly decay 30% concentration it is strong
Decaying illustrates that sealing section new crack occurs and leads to pressure generation of leaking out, leak, and negative pressure value reduces in hole, and it is dense that expection is not achieved in gas
Degree can not be extracted out normally, be directly connected to grouting pump using secondary grouting hole-sealing technology at this time and carry out secondary grouting, realize secondary
Sealing of hole achievees the purpose that second lift drilling concentration.
Compared with prior art, a kind of secondary grouting provided by the invention gas hole sealing device with pressure, in Grouting Pipe two
It is provided with filter, can be first time injection hole sealing drainage exhaust, solve the phenomenon that extra aqueous vapor occupies slip casting space,
So that the case where first time injection hole sealing is more densely cross-linked, which can decay according to gas density, can slip casting concentrate at any time,
It solves the problems, such as gas density decaying, realizes the secondary hole sealing of the single hole during gas drainage, secondary concentrate simultaneously should
Influence of the secondary interstice that pressure redistribution generates when hole sealing device efficiently solves Completion of Drilling Hole to extraction concentration, operation letter
Single, practicability is good, is worthy to be popularized.
Disclosed above is only preferable specific embodiment of the invention, and still, the embodiment of the present invention is not limited to this,
What anyone skilled in the art can be thought variation should all fall into protection scope of the present invention.
Claims (5)
1. a kind of secondary grouting gas hole sealing device with pressure, which is characterized in that including Grouting Pipe one (1) disposed in parallel and sealing of hole
It manages (3), the Grouting Pipe one (1) and hole sealing tube (3) sequentially pass through tactic pouch one (2), pouch two (5) and pouch three
(8), the first grouting pump of one end detachable connection (4) of the Grouting Pipe one (1), the other end of the Grouting Pipe one (1) are set
It is equipped with plug one (10), is respectively arranged with valve two in the Grouting Pipe one (1) and pouch two (5), the superposition section of pouch three (8)
(6) it is separately positioned in pouch two (5), pouch three (8) with valve one (9), the outlet of the valve two (6) and valve one (9),
Be provided with explosive valve two (7) in Grouting Pipe one (1) between the pouch two (5) and pouch three (8), the pouch one (2) and
Grouting Pipe two (16), the second grouting pump of one end detachable connection of the Grouting Pipe two (16) are also equipped in pouch two (5)
(17), the other end of the Grouting Pipe two (16) is provided with plug two (11), between the plug two (11) and pouch two (5)
It is provided in Grouting Pipe two (16) filter (12), is set in the Grouting Pipe two (16) between the pouch two (5) and pouch one (2)
It is equipped with explosive valve one (14), is respectively arranged with valve in the Grouting Pipe two (16) and pouch one (2), the superposition section of pouch two (5)
Three (15) of door and valve four (13), the outlet of the valve three (15) and valve four (13) are separately positioned on pouch one (2), pouch
In two (5).
2. a kind of secondary grouting gas hole sealing device with pressure according to claim 1, which is characterized in that the hole sealing tube
It (3) is pvc pipe.
3. a kind of secondary grouting gas hole sealing device with pressure according to claim 1, which is characterized in that the pouch one
(2), pouch two (5), the material of pouch three (8) are the antistatic high-density fiber cloth of high-elastic wear-resistant.
4. a kind of secondary grouting gas hole sealing device with pressure according to claim 3, which is characterized in that the pouch one
(2), pouch two (5) and pouch three (8) are cylindrical, and the outer diameter and gas of pouch one (2), pouch two (5) and pouch three (8)
The diameter matches of extraction borehole, the internal diameter of the pouch one (2), pouch two (5) and pouch three (8) and the diameter of hole sealing tube (3)
Matching, the long 0.8m of pouch of the pouch one (2) and pouch three (8), the long 1.2m of the pouch of pouch two (5).
5. a kind of construction method of secondary grouting gas hole sealing device with pressure, which is characterized in that include the following steps：
S1, each sealing of hole is sequentially connected with pouch, is sent slowly to gas extraction hole, aperture is away from 1.5 meters of pouch；
S2, for the first time slip casting：
S21, material mixing agitator is opened, hole sealing agent and water is pressed 1:1 is evenly stirred until no agglomeration；
S22, the first grouting pump (4) is connect with the air line of Grouting Pipe one (1) and 0.4Mpa--0.7Mpa respectively, opens the
One grouting pump (4) start switch, and function key is then adjusted at the uniform velocity slow open state, observe the first grouting pump (4) suction situation,
To check whether the first grouting pump (4) and grouting Grouting Pipe one (1) are unobstructed；
S23, the first grouting pump (4) and grouting Grouting Pipe one (1) it is unobstructed in the case where start slip casting for the first time, pouch two (5) and
Pouch three (8) is discharged by valve two (6) and valve one (9) respectively, and pouring material is gradually propped up and infuses real pouch two (5)
With pouch three (8), explosive valve two (7) is opened when the pressure in Grouting Pipe one (1) reaches 0.6-0.8Mpa, and pouring material is through explosion
Valve two (7) is toward the interlude reperfusion serosity between pouch two (5) and pouch three (8), during this period secondary grouting pipeline (16) meeting
It is used as drainage tracheae by filter (12), water and air extra in hole is discharged, to reach pouch two (5) and pouch three
(8) interlude has optimal dense effect, stops slip casting when the pressure of the first grouting pump (4) reaches 1.2Mpa, infuses for the first time
Slurry is completed；
S3, secondary grouting：
S31, material mixing agitator is opened, hole sealing agent and water is pressed 1:1 is evenly stirred until no agglomeration；
S32, the second grouting pump (17) is connect with the air line of Grouting Pipe two (16) and 0.4Mpa--0.7Mpa respectively, slowly
Opening the second grouting pump (17) start switch, function key is then adjusted at the uniform velocity slow open state, observes the second grouting pump
(17) suction situation, to check whether the second grouting pump (17) and grouting Grouting Pipe two (16) are unobstructed；
S33, the second grouting pump (17) and grouting Grouting Pipe two (16) it is unobstructed in the case where start secondary grouting, pouch one (2)
It is discharged by valve three (15), pouring material gradually props up pouch one (2) and infuses reality, filter (12) during this slip casting
Pouch two (5) can be filled up by secondary grouting and crack that pouch three (8) interlude regenerates, the pressure in Grouting Pipe two (16)
Power when reaching 0.6-0.8Mpa, open by explosive valve one (14), and pouring material is through explosive valve one (14) past pouch one (2) and pouch
Interlude reperfusion serosity between two (5) stops slip casting, secondary grouting when the pressure of the second grouting pump (17) reaches 1.2Mpa
It completes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810919312.0A CN108868875B (en) | 2018-08-14 | 2018-08-14 | Secondary grouting gas hole sealing device with pressure and construction method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810919312.0A CN108868875B (en) | 2018-08-14 | 2018-08-14 | Secondary grouting gas hole sealing device with pressure and construction method thereof |
Publications (2)
| Publication Number | Publication Date |
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| CN108868875A true CN108868875A (en) | 2018-11-23 |
| CN108868875B CN108868875B (en) | 2023-11-21 |
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ID=64317818
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810919312.0A Active CN108868875B (en) | 2018-08-14 | 2018-08-14 | Secondary grouting gas hole sealing device with pressure and construction method thereof |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109281638A (en) * | 2018-11-27 | 2019-01-29 | 杭州东升建设工程有限公司 | The synchronous draining slip casting plugging device of the artesian water that drills and method for blocking |
| CN110541726A (en) * | 2019-06-12 | 2019-12-06 | 义马煤业集团孟津煤矿有限责任公司 | two-plugging two-injection one-return type through pipe direct-connection hole sealing method for coal mine gas drainage |
| CN112855071A (en) * | 2021-02-04 | 2021-05-28 | 河南理工大学 | Device and method for plugging gas extraction drill hole by using microbial mineralization circulation |
| CN113236341A (en) * | 2021-06-02 | 2021-08-10 | 山东科技大学 | Device for enhancing gas extraction in underground coal mine and using method |
| CN114320220A (en) * | 2022-01-19 | 2022-04-12 | 河南理工大学 | CO2Construction method for repairing extracted borehole fracture by combining foam and self-repairing slurry |
| CN114856503A (en) * | 2022-05-31 | 2022-08-05 | 中煤能源研究院有限责任公司 | Continuous dynamic sealing device for gas extraction drill hole and using method |
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