CN209179725U - A kind of mash gas pumping drilling solid-liquid two-phase hole sealing device - Google Patents
A kind of mash gas pumping drilling solid-liquid two-phase hole sealing device Download PDFInfo
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- CN209179725U CN209179725U CN201822132083.6U CN201822132083U CN209179725U CN 209179725 U CN209179725 U CN 209179725U CN 201822132083 U CN201822132083 U CN 201822132083U CN 209179725 U CN209179725 U CN 209179725U
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Abstract
The utility model discloses a kind of mash gas pumping drilling solid-liquid two-phase hole sealing devices, including No.1 pouch, No. two pouches, No. three pouches, once grouting pipe and secondary grouting pipe, it is the first sealing section between No.1 pouch and No. two pouches, is the second sealing section between No. two pouches and No. three pouches；The explosive valve being equipped on once grouting pipe in the first sealing section；The other end of secondary grouting pipe is located in the second sealing section and is connected to by second one-way valve with the second sealing section.Using the hole sealing device of the utility model, it networks after the first sealing section solid phase sealing of hole extraction, the periodic detection that gas extraction concentration is carried out to the extraction borehole that solid phase sealing of hole is completed carries out the second sealing section liquid phase sealing of hole to the extraction borehole of gas leakage, can continue to extraction later.The utility model can extraction borehole poor to sealing of hole, gas leakage carry out the operation of liquid phase sealing of hole, and periodic maintenance can be carried out to fluid-tight effect, avoid the cumbersome construction of encryption extraction borehole.
Description
Technical field
The utility model belongs to coal mine gas drainage technical field, is related to a kind of mash gas pumping drilling solid-liquid two-phase sealing of hole dress
It sets.
Background technique
Gas drainage is the important measures solved with pre- preventing coal mine gas disaster, during gas drainage, hole sealing technology
The working efficiency of gas drainage will largely be influenced.If the sealing quality of mash gas pumping drilling is poor, it will cause coal seam
The reduction of Gas Flow pressure difference is unfavorable for that quickly gas drainage being gone out, and will increase the gas drainage time, while can reduce extraction
The utilization efficiency of equipment increases a large amount of fearless energy consumptions of coal mining enterprise.Therefore, the sealing quality for improving mash gas pumping drilling is to protect
The safe and efficient basic guarantee of underground gas extraction is demonstrate,proved, mine gas is administered and utilization is of great significance.
The sealing material generallyd use outside Current Domestic mainly has cement slurry, polyurethane, yellow mud and hole packer sealing of hole etc.
It is several.The hole-sealing technology generallyd use mainly has single closure, a stifled note, two stifled notes etc. several.Above-mentioned sealing material and
The advantages of technique has oneself, has obtained corresponding popularization and application in different regions, but China many mines at present
Gas drainage rate and gas extraction concentration are still reached to less than requirements of the national standard.This sufficiently reflects extraction borehole sealing quality
Difference, the status of gas leakage, reflect that above-mentioned sealing material and technique have some limitations indirectly.Most drillings exist at present
The initial gas density of sealing of hole is also higher, but gas extraction concentration decaying is quickly, cannot maintain the gas of higher concentration, cause watt
This extraction concentration and flow be not up to standard, seriously constrains gas pumping effect.Sealing material and technique there is wretched insufficiency,
It is urgently to be further improved.
For drilling at present, the decaying of interior gas extraction concentration is fast, and existing method for sealing is poor for sealing of hole, gas leakage pumping
The reparation of borehole is helpless.Therefore, manipulation is simple when finding a kind of sealing of hole, sealing of hole effect is good, at low cost, to sealing of hole difference
The device that drilling can carry out secondary hole sealing operation becomes the task of top priority.
Utility model content
The utility model provides a kind of mash gas pumping drilling solid-liquid two-phase to solve shortcoming in the prior art
Hole sealing device, after using solid phase sealing of hole for the first time, can drilling poor to sealing of hole, gas leakage progress secondary hole sealing operation, further
Strengthen sealing of hole effect, can guarantee the up to standard again of the extraction concentration of gas.
The utility model is adopted the technical scheme that solve the above-mentioned problems, and it is solid to provide a kind of mash gas pumping drilling
Liquid two-phase hole sealing device, including No.1 pouch, No. two pouches, No. three pouches, once grouting pipe and secondary grouting pipe, once grouting
Pipe is each passed through the inside of No.1 pouch, No. two pouches and No. three pouches along the aperture of drilling to bottom hole direction, and No.1 pouch is leaned on
The aperture side closely to drill, there are three spaced first check valve, No.1 pouches, No. two pouches for installation on once grouting pipe
It is respectively corresponded with No. three pouches and is connected to first check valve, once grouting pipe is primary note close to aperture one end of drilling
Entrance is starched, once grouting pipe is blocked close to bottom hole one end of drilling.
The No.1 pouch, No. two pouches and No. three pouches are elastic pouch, No.1 pouch, No. two pouches and No. three capsules
It being in close contact after bag slip casting expansion with the hole wall of drilling, the gap between No.1 pouch and No. two pouches is denoted as the first sealing section,
Gap between No. two pouches and No. three pouches is denoted as the second sealing section；Explosive valve, explosive valve position are installed on once grouting pipe
In in the first sealing section.
Secondary grouting pipe is each passed through the inside of No.1 pouch and No. two pouches along the aperture of drilling to bottom hole direction, secondary
Grouting Pipe is secondary grouting entrance close to aperture one end of drilling, and the other end of secondary grouting pipe is located in the second sealing section and logical
Second one-way valve is crossed to be connected to the second sealing section.
Preferably, No.1 pouch is identical with the structure of No. two pouches, opens up respectively in No.1 pouch and No. two pouches useful
In the hole location that once grouting pipe, secondary grouting pipe and gas drainage casing pass through；No. three pouches are offered for once grouting pipe
The hole location passed through with gas drainage casing.
Preferably, the both ends of No.1 pouch, No. two pouches and No. three pouches pass through snap ring respectively and are fixedly mounted on primary note
It starches on pipe.
Preferably, the cracking pressure of explosive valve is simultaneously greater than the unlatching of the cracking pressure and second one-way valve of the first check valve
Pressure, and the cracking pressure of explosive valve is less than effective resistance to compression pressure of No.1 pouch, No. two pouches and No. three pouches simultaneously.
Preferably, half of the length of the second sealing section less than the first sealing of hole segment length.
Preferably, the explosive valve is located at the middle part of the first sealing section.
By adopting the above technical scheme, the utility model has the advantage that
It, only need to be by one when fixing pouch using a kind of mash gas pumping drilling solid-liquid two-phase hole sealing device of the utility model
The both ends of number pouch, No. two pouches and No. three pouches pass through snap ring respectively and are fixedly mounted on once grouting pipe, each pouch
It can be close to tube wall automatically after pouch slip casting expansion with the hole location that secondary grouting pipe and gas drainage casing are in contact, play plug
Effect, pouch are fixed conveniently fast.
The length of the second sealing section of the utility model, can be to avoid second less than the half of the first sealing of hole segment length
Liquid phase sealing material used in sealing section sealing of hole consumes excessively, save the cost.
The explosive valve installed on the utility model once grouting pipe is located at the middle part of the first sealing section, makes in the first sealing section
Space injection speed positioned at explosive valve two sides is consistent.
Can be after the first sealing section solid phase sealing of hole using the utility model, poor to sealing of hole, gas leakage extraction borehole carries out
The operation of second sealing section liquid phase sealing of hole further enhances sealing of hole effect, and can carry out to the second sealing section fluid-tight effect regular
Maintenance, so that gas drainage hole keeps higher extraction concentration and lower Reduction Level, effect good.This behave, which avoids, to be added
The cumbersome construction of close extraction borehole.
To sum up, a kind of mash gas pumping drilling solid-liquid two-phase hole sealing device of the utility model, which has, manipulates simple, saving energy
Source, strong applicability and it is safe and efficient the advantages that, can extraction borehole poor to sealing of hole, gas leakage carry out the operation of liquid phase sealing of hole, and
Periodic maintenance can be carried out to fluid-tight effect, avoid the cumbersome construction of encryption extraction borehole, and manipulate simple, effect in sealing of hole
Rate is high, and consumption sealing material is few, at low cost, and gas drainage hole is made to keep higher extraction concentration and lower decaying after sealing of hole
It is horizontal.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the utility model.
Specific embodiment
As shown in Figure 1, a kind of mash gas pumping drilling solid-liquid two-phase hole sealing device of the utility model include No.1 pouch 1,
2, No. three pouches 3 of No. two pouches, once grouting pipe 4 and secondary grouting pipe 5, No.1 pouch 1 is identical with the structure of No. two pouches 2,
It offers in No.1 pouch 1 and No. two pouches 2 and is worn for once grouting pipe 4, secondary grouting pipe 5 and gas drainage casing 10 respectively
The hole location crossed；No. three pouches 3 offer the hole location passed through for once grouting pipe 4 and gas drainage casing 10；No.1 pouch 1,
The both ends of No. two pouches 2 and No. three pouches 3 pass through snap ring 6 respectively and are fixedly mounted on once grouting pipe 4.Fixed No.1 pouch 1,
When No. two pouches 2 and No. three pouches 3, it is not limited to using snap ring 6, it is possible to use steel wire, the rope made of hemp or mightiness belt etc..
Once grouting pipe 4 is each passed through 1, No. two pouch 2 of No.1 pouch and No. three to bottom hole direction along the aperture of drilling 11
The inside of pouch 3, No.1 pouch 1 is close to the aperture side of drilling 11, and there are three spaced for installation on once grouting pipe 4
One check valve 7,1, No. two pouch 2 of No.1 pouch is respectively corresponded with No. three pouches 3 is connected to first check valve 7, once
Grouting Pipe 4 is once grouting entrance close to aperture one end of drilling, can be connected to by the first quick coupling with grouting pump, primary to infuse
Pipe 4 is starched to block close to bottom hole one end of drilling 11.
1, No. two pouch 2 of the No.1 pouch and No. three pouches 3 are elastic pouch and can guarantee that water was only starched, and are prevented
It is closely connect after superfine cement slurry exudation, 1, No. two pouch 2 of No.1 pouch and No. three 3 slip casting of pouch expansions with the hole wall of drilling 11
Touching, the gap between No.1 pouch 1 and No. two pouches 2 is denoted as the first sealing section, between No. two pouches 2 and No. three pouches 3 between
Gap is denoted as the second sealing section；Half of the length of second sealing section less than the first sealing of hole segment length, the length of the second sealing section
Degree cannot be too long, less than the half of the first sealing of hole segment length, can consume excessively to avoid sealing material, save the cost.
Explosive valve 8 is installed, the explosive valve 8 is located at the middle part of the first sealing section, makes the first sealing of hole on once grouting pipe 4
Space injection speed in section positioned at 8 two sides of explosive valve is consistent.
Secondary grouting pipe 5 is each passed through in No.1 pouch 1 and No. two pouches 2 along the aperture of drilling 11 to bottom hole direction
Portion, secondary grouting pipe 5 are secondary grouting entrance close to aperture one end of drilling 11, can be connected by the second quick coupling and grouting pump
Logical, the other end of secondary grouting pipe 5 is located in the second sealing section and is connected to by second one-way valve 9 with the second sealing section.
The cracking pressure of explosive valve 8 is simultaneously greater than the cracking pressure of the first check valve 7 and the unlatching pressure of second one-way valve 9
Power, and the cracking pressure of explosive valve 8 is less than effective resistance to compression pressure of 1, No. two pouch 2 of No.1 pouch and No. three pouches 3 simultaneously.Tool
When body is implemented, effective resistance to compression pressure of 1, No. two pouch 2 of No.1 pouch and No. three pouches 3 is 2 MPa, the first check valve 7 and the
The cracking pressure of two check valves 9 is 0.5 MPa, and the cracking pressure of explosive valve 8 can be 1.2 MPa.
Using hole sealing device described in the utility model mash gas pumping drilling solid-liquid two-phase hole-sealing technology the following steps are included:
Step 1, the preparation before sealing of hole: after mash gas pumping drilling 11 forms, cleaning bottom of hole, which retreats, to be bored；Gas drainage is bored
Hole solid-liquid two-phase hole sealing device is denoted as hole sealing device, according to the requirement of extraction sleeve design, connects gas drainage floral tube and gas is taken out
Real pipe composition gas drainage casing 10 is adopted, and gas drainage casing 10 is passed through into 1, No. two pouch 2 of No.1 pouch and No. three pouches 3
Inside；According to sealing of hole parameter, hole sealing device is fixed in gas drainage casing 10 a certain determining position of real pipeline section, will be fixed
The gas drainage casing 10 of hole sealing device is sent into drilling 11, and gas drainage casing 10 and hole sealing device enter the pre- of drilling 11
After determining sealing of hole position, gas drainage casing 10 and the hole wall of drilling 11 are fixed using polyurethane.
Step 2, to the first sealing section solid phase sealing of hole: first preparing solid phase sealing material using sealing material a；Again by solid phase
Sealing material is injected in the first sealing section by grouting pump and the first Grouting Pipe, completes the first sealing section solid phase sealing of hole.
Prepare solid phase sealing material: being packed into a certain amount of water in agitator in advance, then by 0.8:1 water material proportion relation to
The water that i.e. 0.8 parts by weight of sealing material a(are added in agitator adds the sealing material a) of 1 parts by weight, starts blender after the completion,
Slurries are uniformly mixed, solid phase sealing material is obtained.
The sealing material a is by 1250 mesh (grain diameter is less than or equal to 10 μm) or thinner superfine cement and diminishing
Agent, accelerator, swelling agent, modifying agent hybrid modulation form, superfine cement: water-reducing agent: swelling agent: accelerator: modifying agent is most
Excellent weight proportion is 100:0.5:10:0.3:0.3.
Wherein, the water-reducing agent is poly carboxylic acid series water reducer (such as high-efficiency water-reducing agent of poly-carboxylic acid).
The accelerator be concrete accelerator, main component be aluminum oxide clinker (i.e. bauxite, soda ash, quick lime press than
The clinker that example is fired into), (such as J85 type concrete accelerator executes standard JC477-2005) is made through levigate.
The swelling agent is cement expansive material, belongs to calcium sulphoaluminate type cement expansive material (such as UEA type concrete expansion
Agent executes standard JC476-2001).
The modifying agent is that fast T(full name is aerosol-OT salt), it is surfactant.
The surface tension that water and sealing material a carry out the slurries that formation is mixed according to 0.8:1 is 26.33 mN.m-1,
Contact angular region of the slurries with coal petrography is 12 ~ 18 °, and in slip casting 1.5 MPa of maximum pressure, slurries can overcome capillary pressure
Into 3 μm of 11 hole wall fracture width of drilling with coconnected microcrack.
Inject solid phase sealing material: using the once grouting pipe of the first quick coupling connection slip casting pump discharge and hole sealing device
4, start grouting pump, starts to inject solid phase sealing material into once grouting pipe 4；When the pressure of grouting pump reaches the first check valve
When 7 cracking pressure, solid phase sealing material separately flows into and fills 1, No. two pouch 2 of No.1 pouch and No. three pouches 3；No.1 capsule
After 1, No. two pouch 2 of bag and No. three pouches 3 are full of, i.e., three " plug " with pressure is generated in the predetermined sealing of hole position of drilling 11,
Three " plug " with pressure intermediate generations, two hole-sealing grouting spaces；As the pressure of grouting pump continues to increase, when the pressure of grouting pump
When power reaches the cracking pressure of explosive valve 8, solid phase sealing material flows into (i.e. No.1 pouch 1 and No. two pouches 2 in the first sealing section
Between), start to fill the first sealing section；After first sealing section is full of, continue to inject solid phase sealing material (injection maximum pressure dimension
Hold in 1.5 MPa), solid phase sealing material is penetrated under pressure in the surrounding crack of 11 hole walls of drilling；When slip casting is pumped
When power quickly increases, grouting pump is closed, completes the first sealing section solid phase sealing of hole.
Step 3, extraction of networking, and periodically screening 11: the first sealing section solid phase sealing of hole of gas leakage extraction borehole terminates, first
After solid phase sealing material in sealing section tentatively solidifies, extraction of networking after gas drainage casing 10 is docked with methane gas extraction pipeline
Gas；The periodic detection that gas extraction concentration is carried out to the extraction borehole 11 that the first sealing section solid phase sealing of hole is completed, assesses it
The attenuation degree of gas extraction concentration finds the extraction borehole 11 of gas leakage in time；If the gas extraction concentration of extraction borehole 11
It is down to 30% and hereinafter, the second sealing section liquid phase sealing of hole need to be carried out, if the gas extraction concentration of extraction borehole 11 maintains always
30% or more, it, can be without the second sealing section liquid phase sealing of hole for save the cost.
Step 4 carries out the second sealing section liquid phase sealing of hole to the extraction borehole 11 of gas leakage: first preparing liquid using sealing material b
Phase sealing material；Liquid phase sealing material is injected in the second sealing section by grouting pump and the second Grouting Pipe again, completes the second envelope
Hole section liquid phase sealing of hole.
Prepare liquid phase sealing material: being packed into a certain amount of water in agitator in advance, then by 200:1 water material proportion relation to
The water that i.e. 200 parts by weight of sealing material b(are added in agitator adds the sealing material b) of 1 parts by weight, starts blender after the completion, will
Liquid is uniformly mixed, and is modulated into glue, is obtained liquid phase sealing material.
(natural plant gum is using water-soluble preferable guanidine by water-soluble preferable natural plant gum by sealing material b described in step 4
Glue can also be replaced with the natural plants glue material such as sesbania gum, guar gum, flax gum, fenugreek gum), crosslinking agent, moisturizer, change
Property agent hybrid modulation forms.
Wherein, the crosslinking agent is borax, and the moisturizer is poly- third acetamide, and the modifying agent is fast T(sulfosuccinate
Dioctyl phthalate sodium salt), it is surfactant.
The modulation principle of sealing material b is: water and sealing material b exist according to the glue that 200:1 be mixed formation
Only allow to leave micro residue after evaporation drying, cannot influence it is subsequent again or repeatedly fluid injection；The viscosity of glue cannot be low
In 300 mPa.s, surface tension should be less than 31 mN.m-1, contact angular region of the glue with coal petrography is 20 ~ 28 °, in fluid injection maximum
When 1.5 MPa of pressure, glue can overcome capillary pressure to enter 75 nm of hole wall fracture width with coconnected ultra micro crack.
Inject liquid phase sealing material: using the secondary grouting pipe of the second quick coupling connection slip casting pump discharge and hole sealing device
5, start grouting pump, starts to inject liquid phase sealing material into secondary grouting pipe 5；When the pressure of grouting pump reaches second one-way valve
When 9 cracking pressure, in liquid phase sealing material the second sealing section of inflow (i.e. between No. two pouches 2 and No. three pouches 3), start to fill
Fill out the second sealing section；After second sealing section is full of, continuing injection liquid phase sealing material, (injection maximum pressure maintains 1.5
MPa), liquid phase sealing material is penetrated under pressure in the surrounding crack of 11 hole walls of drilling；When slip casting pump pressure quickly rises
Gao Shi closes grouting pump, completes the second sealing section liquid phase sealing of hole.
The periodic maintenance of the second sealing section: step 5 after the second sealing section liquid phase sealing of hole, continues mash gas extraction；It is right
The extraction borehole 11 that the second sealing section liquid phase sealing of hole is completed carries out the periodic detection of gas extraction concentration, finds gas leakage in time
Extraction borehole 11 repeats step 4 and step 5 to the second sealing section of gas leakage extraction borehole 11.
The snap ring 6, the first check valve 7, second one-way valve 9 and explosive valve 8 are existing conventional equipment, and specific structure is not
It is described in detail again.
The present embodiment not makes any form of restriction the shape of the utility model, material, structure etc., all foundations
The technical essence of the utility model any simple modification, equivalent change and modification to the above embodiments, belong to this reality
With the protection scope of new technique scheme.
Claims (6)
1. a kind of mash gas pumping drilling solid-liquid two-phase hole sealing device, it is characterised in that: including No.1 pouch, No. two pouches, No. three
Pouch, once grouting pipe and secondary grouting pipe, once grouting pipe along the aperture of drilling to bottom hole direction be each passed through No.1 pouch,
The inside of No. two pouches and No. three pouches, No.1 pouch is close to installation on the aperture side of drilling, once grouting pipe there are three between
Every the first check valve of setting, No.1 pouch, No. two pouches and No. three pouches, which respectively correspond, is connected to first check valve,
Once grouting pipe is once grouting entrance close to aperture one end of drilling, and once grouting pipe is blocked close to bottom hole one end of drilling；
The No.1 pouch, No. two pouches and No. three pouches are elastic pouch, No.1 pouch, No. two pouches and No. three pouch notes
It being in close contact after slurry expansion with the hole wall of drilling, the gap between No.1 pouch and No. two pouches is denoted as the first sealing section, and No. two
Gap between pouch and No. three pouches is denoted as the second sealing section；Explosive valve is installed, explosive valve is located at the on once grouting pipe
In one sealing section；
Secondary grouting pipe is each passed through the inside of No.1 pouch and No. two pouches, secondary grouting along the aperture of drilling to bottom hole direction
Pipe is secondary grouting entrance close to aperture one end of drilling, and the other end of secondary grouting pipe is located in the second sealing section and passes through the
Two check valves are connected to the second sealing section.
2. a kind of mash gas pumping drilling solid-liquid two-phase hole sealing device according to claim 1, it is characterised in that: No.1 pouch
It is identical with the structure of No. two pouches, it is offered respectively in No.1 pouch and No. two pouches for once grouting pipe, secondary grouting pipe
The hole location passed through with gas drainage casing；No. three pouches offer the hole passed through for once grouting pipe and gas drainage casing
Position.
3. a kind of mash gas pumping drilling solid-liquid two-phase hole sealing device according to claim 2, it is characterised in that: No.1 capsule
The both ends of bag, No. two pouches and No. three pouches pass through snap ring respectively and are fixedly mounted on once grouting pipe.
4. a kind of mash gas pumping drilling solid-liquid two-phase hole sealing device according to claim 3, it is characterised in that: explosive valve
Cracking pressure is simultaneously greater than the cracking pressure of the first check valve and the cracking pressure of second one-way valve, and the cracking pressure of explosive valve
It is less than effective resistance to compression pressure of No.1 pouch, No. two pouches and No. three pouches simultaneously.
5. a kind of mash gas pumping drilling solid-liquid two-phase hole sealing device according to claim 4, it is characterised in that: the second sealing of hole
Half of the length of section less than the first sealing of hole segment length.
6. a kind of mash gas pumping drilling solid-liquid two-phase hole sealing device according to claim 5, it is characterised in that: the explosion
Valve is located at the middle part of the first sealing section.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822132083.6U CN209179725U (en) | 2018-12-19 | 2018-12-19 | A kind of mash gas pumping drilling solid-liquid two-phase hole sealing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822132083.6U CN209179725U (en) | 2018-12-19 | 2018-12-19 | A kind of mash gas pumping drilling solid-liquid two-phase hole sealing device |
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| Publication Number | Publication Date |
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| CN209179725U true CN209179725U (en) | 2019-07-30 |
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ID=67377321
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201822132083.6U Expired - Fee Related CN209179725U (en) | 2018-12-19 | 2018-12-19 | A kind of mash gas pumping drilling solid-liquid two-phase hole sealing device |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109339736A (en) * | 2018-12-19 | 2019-02-15 | 河南理工大学 | A kind of mash gas pumping drilling solid-liquid two-phase hole sealing device and technique |
| CN110926292A (en) * | 2019-12-16 | 2020-03-27 | 安徽理工大学 | Water-leakage-proof sand hole sealing bag for coal mine blasting and using method thereof |
| CN111963150A (en) * | 2020-08-27 | 2020-11-20 | 安徽理工大学 | Coal bed gas pressure measuring device and using method |
| CN113236347A (en) * | 2021-06-28 | 2021-08-10 | 山东科技大学 | Full-automatic gas extraction multiple hole sealing system and method |
-
2018
- 2018-12-19 CN CN201822132083.6U patent/CN209179725U/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109339736A (en) * | 2018-12-19 | 2019-02-15 | 河南理工大学 | A kind of mash gas pumping drilling solid-liquid two-phase hole sealing device and technique |
| CN109339736B (en) * | 2018-12-19 | 2023-09-01 | 河南理工大学 | Solid-liquid two-phase hole sealing device and process for gas extraction drilling |
| CN110926292A (en) * | 2019-12-16 | 2020-03-27 | 安徽理工大学 | Water-leakage-proof sand hole sealing bag for coal mine blasting and using method thereof |
| CN110926292B (en) * | 2019-12-16 | 2021-09-10 | 淮南矿业(集团)有限责任公司 | Water-leakage-proof sand hole sealing bag for coal mine blasting and using method thereof |
| CN111963150A (en) * | 2020-08-27 | 2020-11-20 | 安徽理工大学 | Coal bed gas pressure measuring device and using method |
| CN111963150B (en) * | 2020-08-27 | 2023-08-22 | 安徽理工大学 | Coal bed gas pressure measuring device and using method |
| CN113236347A (en) * | 2021-06-28 | 2021-08-10 | 山东科技大学 | Full-automatic gas extraction multiple hole sealing system and method |
| CN113236347B (en) * | 2021-06-28 | 2022-08-02 | 山东科技大学 | Full-automatic gas extraction multiple hole sealing system and method |
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| Date | Code | Title | Description |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20190730 Termination date: 20191219 |