CN214787298U - Large-drift-diameter secondary hole sealing device for gas extraction drill hole - Google Patents
Large-drift-diameter secondary hole sealing device for gas extraction drill hole Download PDFInfo
- Publication number
- CN214787298U CN214787298U CN202023021929.2U CN202023021929U CN214787298U CN 214787298 U CN214787298 U CN 214787298U CN 202023021929 U CN202023021929 U CN 202023021929U CN 214787298 U CN214787298 U CN 214787298U
- Authority
- CN
- China
- Prior art keywords
- hole sealing
- hole
- pipe
- drill
- drill hole
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Pipe Accessories (AREA)
Abstract
The utility model relates to a gas drainage drilling big latus rectum secondary hole sealing device belongs to gas prevention and cure engineering technical field. The hole sealing device comprises hole sealing units and hole sealing pipes, wherein one end of each hole sealing pipe arranged in a drill hole is an air inlet end, the number of the hole sealing units is two, the two hole sealing units are arranged in the drill hole between the air inlet end and a drill hole outlet, the two hole sealing units are sequentially arranged along the extending direction of the drill hole, and the outer diameter of each hole sealing pipe is larger than or equal to 50 mm. The utility model can increase the cross section area of the gas flow channel and reduce the gas flow resistance during the hole pre-pumping period; and (4) secondary hole sealing is carried out during the continuous extraction period of the drill hole, the continuous sealed extraction of the drill hole is kept, and the extraction efficiency and the life cycle of the drill hole are continued. After the primary hole sealing is completed, leakage detection recognition can be realized according to the extraction concentration and the extraction flow, and secondary hole sealing is carried out on the drilled hole.
Description
Technical Field
The utility model belongs to the technical field of the gas prevention and cure engineering, a big latus rectum secondary hole sealing device of gas drainage drilling is related to.
Background
With the rapid development of the gas extraction large-diameter drill hole drilling technology and equipment, the technical advantages of the large-diameter drill hole in the gas extraction effect are further verified, and the large-diameter gas extraction drill hole is promoted to gradually become the development trend of gas extraction. At present, a two-plugging one-injecting hole sealing process is widely adopted for sealing a gas extraction drill hole, and a drill hole, a crack ring around the drill hole and a coal body crack channel are tightly plugged by slurry to ensure the sealed extraction of the drill hole.
The pore diameter of the drilled hole is increased, the pressure relief range of the coal body around the drilled hole and the fracture channel are further developed, the gas desorption speed is high, the gas desorption amount is large, and a large amount of adsorbed gas is desorbed and moves towards the direction of the drilled hole under the effects of pore-forming pressure relief effect and pressure gradient. The traditional small-caliber hole sealing pipe has certain limitation on a gas extraction flow channel in unit time under similar extraction conditions; on the other hand, the small-caliber hole sealing pipe generally has large pipeline friction resistance, and the resistance superposition effect can seriously affect the resistance loss of an extraction system and a pipe network in consideration of the scale and the coverage of the gas extraction drilling engineering quantity; meanwhile, under the influence of factors such as stress redistribution characteristics and pressure relief effects during roadway excavation, coal matrix shrinkage and creep behavior, original fracture channels of the coal body around the hole are further expanded, and new fracture channels are derived; with the lapse of extraction time, the traditional drilling sealing mode gradually causes that the extraction concentration is reduced because external air leaks into the drill hole. How to efficiently realize the large-drift-diameter, large-flow and low-resistance gas extraction of the gas extraction drill hole, how to efficiently realize the leakage detection of the gas extraction drill hole, and how to realize the secondary hole sealing of the drill hole and continue the extraction effect and the life cycle on the basis of the known leakage detection measuring result are the keys for further combining the high-efficiency extraction of the gas of the large-diameter drill hole.
At present, a known gas extraction drilling and hole sealing device (CN111852391A) with adaptive deformation comprises a hole sealing unit and a hole sealing pipe, wherein one end of the hole sealing pipe arranged in a drill hole is an air inlet end, the hole sealing pipe is divided into two times, the air inlet ends of the two times of hole sealing pipes are all arranged by penetrating through the hole sealing unit, so that adaptive drilling deformation of the hole sealing pipe can be realized, a traditional PVC straight pipe splicing or screw thread connection mode is not required, and the splicing or screw thread connection disjointing between pipes caused by drilling deviation and deformation is avoided; the grouting pressure-bearing capacity of the hole sealing pipe is further improved, the hole sealing pipe is prevented from being flattened under grouting pressure, slurry flows into the hole sealing pipe, the sealing performance of a grouting air chamber between hole sealing bags is guaranteed, and grouting pressure is improved to ensure that the slurry can effectively penetrate into coal cracks around the hole.
At present, a known gas extraction drilling leak detection and leak stoppage integrated device (CN110056389A) comprises a material injection pipe, a material pumping pipe and an extraction pump, wherein during extraction, a gas analyzer is used for collecting and analyzing gas, and whether leak and leak detection effects occur is judged; and uniformly coating the slurry on the inner wall of the collecting hole through the material injecting pipe to block the gap. In the known secondary high-pressure grouting type coal seam drilling gas extraction and pressure measurement integrated hole sealing device (CN205638348U), expansion cloth bags I and II are arranged in a drill hole, and the diameter of the cloth bag is larger than that of the drill hole after the cloth bag is completely expanded; the cloth bags I and II are communicated through a communicating pipe; the primary grouting pipe is directly communicated with the expansion cloth bag II, the secondary grouting pipe is inserted between the expansion cloth bags I and II, the gas extraction pipe is inserted into the drilled hole, the end part of the gas extraction pipe is provided with a sieve pipe, and the exhaust pipe is inserted between the expansion cloth bags I and II. A known secondary hole sealing device (CN201193533) for a gas drainage borehole includes a main gas inlet pipe, a control valve, a pressure reducing valve, and a feeding device, where the main gas inlet pipe is connected to the feeding device, and the control valve and the pressure reducing valve are sequentially disposed on an inlet pipeline of the feeding device. The gas source adopts high-pressure gas in a compressed air pipeline, the inlet pressure is reduced to proper pressure through a control valve and a pressure reducing valve, the secondary hole sealing material is blown into the gas extraction drill hole at certain pressure through the feeding device, and the hole sealing material is filled in the drill hole under the action of the pressure and permeates into cracks around the drill hole to complete secondary hole sealing of the gas extraction drill hole. A mining continuous quantitative secondary hole sealing system (CN103016045A) is characterized in that an air inlet pipeline is connected with an inlet of a mechanical timer, an outlet of the mechanical timer is simultaneously connected with a branch pipeline I and a branch pipeline II, the branch pipeline II is sequentially connected with a pressure regulating valve II, a check valve II and a fastening device in series, the fastening device is connected with a pneumatic motor through a high-pressure air pipe, the pneumatic motor is connected with a rotary feeder, the upper end of the rotary feeder is connected with the lower end of a feed device bin, the lower end of the rotary feeder is connected with the upper end of an accelerating air chamber, and the branch pipeline I is sequentially connected with the pressure regulating valve I, the check valve I and the accelerating air chamber in series. The known secondary hole sealing system (CN102230394A) for improving the gas extraction concentration of the coal seam comprises a compressed air pipe, a control valve, a pressure reducing valve, a secondary hole sealing device, a pressure gauge, a water inlet pipe, a vent pipe, a gas-liquid mixed flow pipe, an atomizer, a transparent rubber pipe, a diffuser and the like, wherein after the high-pressure air of the underground compressed air system is reduced to a proper pressure through the pressure reducing valve, fine expansion powder is conveyed into a cavity communicated with an air leakage crack through the secondary hole sealing device, and then enters the air leakage crack. The atomizer atomizes clean water of an underground water supply system to provide sufficient water source for powder in the air leakage crack, so that the powder is fully expanded to completely block the air leakage crack.
The known gas extraction drill hole leakage detection and progressive secondary hole sealing device and the using method (CN111852392A) comprise two hole sealing units and a hole sealing pipe, wherein the two hole sealing units are sequentially arranged along the extending direction of a drill hole; one end of the hole sealing pipe arranged in the drill hole is an air inlet end, the hole sealing pipe is divided into two steps, the air inlet end of the hole sealing pipe in one step is arranged between the two hole sealing units, and the air inlet end of the hole sealing pipe in the other step is arranged to penetrate through the two hole sealing units; the method comprises leak detection monitoring and secondary hole sealing. The progressive secondary hole sealing can be performed during the continuous extraction of the drill hole, the continuous sealed extraction of the drill hole is kept, and the extraction efficiency and the life cycle of the drill hole are continued; the self-adaptive deformation of the drill hole can be realized when the track of the drill hole deviates, so that the hole sealing pipe is prevented from being flattened under the grouting pressure, and hole sealing slurry enters the hole sealing pipe, and the pumping and extraction are ensured to be stable and reliable; the requirements of gas extraction flow channels in different extraction periods under the extraction attenuation aging characteristic are met.
In summary, at present, a great deal of research is conducted on two-hole one-injection and hole-sealing, hole-sealing leakage detection identification and secondary hole sealing in a gas extraction drill hole, but a large-diameter secondary hole sealing device which is suitable for a large-diameter gas extraction drill hole is rarely reported.
SUMMERY OF THE UTILITY MODEL
In view of this, the utility model aims at providing a gas drainage drilling large-bore secondary hole sealing device, can increase the cross-sectional area of gas flow path, reduce the gas flow resistance during hole pre-extraction; and (4) secondary hole sealing is carried out during the continuous extraction period of the drill hole, the continuous sealed extraction of the drill hole is kept, and the extraction efficiency and the life cycle of the drill hole are continued.
In order to achieve the above purpose, the utility model provides a following technical scheme: the utility model provides a gas drainage drilling large-bore secondary hole sealing device, includes hole sealing unit and hole sealing pipe, the one end that the hole sealing pipe set up in the drilling is the inlet end, the hole sealing unit is two, and two hole sealing units set up in the drilling between inlet end and the drilling export, two hole sealing units set gradually along the extending direction of drilling, the hole sealing pipe be greater than or equal to 50 mm.
Optionally, the hole sealing unit is two-plug one-hole injection device, the hole sealing unit includes a grouting pipe and a hole sealing bag arranged on the grouting pipe, a one-way valve is arranged in the hole sealing bag, and the grouting pipe injects the grouting into the hole sealing bag through the one-way valve; the hole sealing bag is 2, and 2 the hole sealing bag sets gradually along the slip casting pipe, still be provided with the blast valve on the slip casting pipe, the blast valve sets up between 2 the hole sealing bag.
Optionally, the hole sealing tube is a continuous tube.
Optionally, the outer diameter of the hole sealing pipe is 63mm, the wall thickness of the hole sealing pipe is 7mm, and the inner diameter of the hole sealing pipe is 49 mm.
Optionally, the outer diameter of the hole sealing pipe is 75mm, the wall thickness of the hole sealing pipe is 8.30mm, and the inner diameter of the hole sealing pipe is 58.40 mm.
Optionally, the outer diameter and the inner diameter of the grouting pipe are 16mm and 12mm respectively.
Optionally, the length of the sealing pocket is 1000 mm.
The beneficial effects of the utility model reside in that: (1) the traditional hole sealing pipe with the outer diameter of 50mm is converted into a hole sealing pipe with the outer diameter of 63mm or 75mm, so that the cross section area of a gas extraction flow channel of the hole sealing pipe is increased, and the gas extraction flow rate in unit time under the same condition is increased. According to theoretical calculation, when the hole sealing pipe is increased from 50mm to 63mm, the inner diameter of a drill hole is increased from 38.80mm to 49mm, increased by 10.20mm and increased by 1.27 times according to the calculation of the nominal pressure of 2 MPa; cross-sectional area is 0.001182m2Increased to 0.001885m2Increase by 0.000703m2Increased by a factor of 1.59. When the hole sealing pipe is increased from 50mm to 75mm, the inner diameter of the drilled hole is increased from 38.80mm to 58.40mm, increased by 19.60mm and increased by 1.51 times according to the calculation of the nominal pressure of 2 MPa; cross-sectional area is 0.001182m2Increased to 0.002677m2Increase by 0.001495m2Increased by a factor of 2.27.
(2) According to the basic equation of the friction resistance of the pipeline, the relationship between the flow velocity of gas in the pipeline and the mixed flow and the inner diameter of the pipeline, the calculation equation of the friction resistance of the pipeline can be obtained:
h, pipeline friction resistance loss, Pa;
lambda is the coefficient of friction resistance of the pipeline, and has no dimension;
l is the length of the pipeline, m;
v is the gas flow velocity in the pipeline, m/s;
d is the inner diameter of the pipeline, m;
rho-gas density in the pipeline, kg/m3。
Q-gas mixture flow in the pipe, m3/s。
According to the equation, the frictional resistance of the pipeline is in inverse proportion to the 5 th power of the inner diameter of the pipeline, and when the inner diameter of the hole sealing pipe is increased, the frictional resistance of the pipeline is greatly reduced. In combination with the practical engineering, the number of the mine gas extraction drill holes is always based on thousands, the reduction of the friction resistance of the drill hole sealing pipeline greatly reduces the resistance loss of a gas extraction system and a pipe network, keeps the system to run more efficiently and stably, and reduces the idle work of a pump set and the pipe network.
(3) Along with the drainage time, the coal around the hole generates stress strain and matrix shrinkage under the continuous action of drilling pressure relief and drainage negative pressure, or when external air leaks into the drill hole through a fracture channel due to the fact that plugging is not tight, the utility model discloses can realize leak hunting identification according to drainage concentration and drainage flow after two-plug one-injection hole packer near the hole opening completes one-time hole sealing; and (3) carrying out secondary hole sealing on two injection hole sealers far away from the hole opening by regulating and controlling the hole sealing pipe, the grouting pipe and the hole sealing bag of the primary hole sealing.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention may be realized and attained by the means of the instrumentalities and/or combinations particularly pointed out in the appended claims.
Drawings
For the purposes of promoting a better understanding of the objects, features and advantages of the invention, reference will now be made to the following detailed description taken in conjunction with the accompanying drawings in which:
FIG. 1 is a schematic structural diagram of a large-drift-diameter secondary hole sealing device for a gas extraction borehole;
FIG. 2 is a schematic cross-sectional view of the large-drift-diameter secondary hole sealing device for the gas extraction drill hole;
FIG. 3 is a schematic structural view of a single occlusion;
FIG. 4 is a schematic cross-sectional view taken at A-A of FIG. 3;
FIG. 5 is a schematic structural view of a secondary plugging;
fig. 6 is a schematic cross-sectional view at B-B in fig. 5.
Reference numerals: the drilling machine comprises a drilling hole 1, a hole sealing pipe 2, a grouting pipe 3, a hole sealing bag 4, a one-way valve 5, an explosion valve 6 and an air inlet end 7.
Detailed Description
The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will be readily apparent to those skilled in the art from the disclosure herein. The present invention can also be implemented or applied through other different specific embodiments, and various details in the present specification can be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention, and the features in the following embodiments and examples may be combined with each other without conflict.
Wherein the showings are for the purpose of illustrating the invention only and not for the purpose of limiting the same, and in which there is shown by way of illustration only and not in any way limiting the scope of the invention; for a better understanding of the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if there are terms such as "upper", "lower", "left", "right", "front", "back", etc., indicating directions or positional relationships based on the directions or positional relationships shown in the drawings, it is only for convenience of description and simplification of description, but it is not intended to indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore, the terms describing the positional relationships in the drawings are only used for illustrative purposes and are not to be construed as limiting the present invention, and those skilled in the art can understand the specific meanings of the terms according to specific situations.
Example 1
Referring to fig. 1 to 2, a large-bore secondary hole sealing device for a gas extraction borehole includes a hole sealing unit for sealing a borehole 1 and a hole sealing pipe 2. The hole sealing pipe 2 is a continuous pipe, and one end of the hole sealing pipe 2 arranged in the drill hole 1 is an air inlet end 7. The hole sealing units are two, the two hole sealing units are arranged in the drill hole 1 between the air inlet end 7 and the outlet of the drill hole 1, the two hole sealing units are sequentially arranged along the extending direction of the drill hole 1, and the outer diameter of the hole sealing pipe 2 is larger than or equal to 50 mm. In this embodiment, the outer diameter of the hole sealing pipe 2 is 75mm, the wall thickness of the hole sealing pipe 2 is 8.30mm, and the inner diameter of the hole sealing pipe 2 is 58.40 mm. The hole sealing unit is two-plug one-hole injection device. The hole sealing unit comprises a grouting pipe 3 and a hole sealing bag 4 arranged on the grouting pipe 3, a one-way valve 5 is arranged inside the hole sealing bag 4, and the grouting pipe 3 injects slurry into the hole sealing bag 4 through the one-way valve 5. The length of hole sealing bag 4 is 1000mm, and hole sealing bag 4 is 2, and 2 hole sealing bags 4 set gradually along slip casting pipe 3. The grouting pipe 3 is also provided with an explosion valve 6, and the explosion valve 6 is arranged among the 2 hole sealing bags 4.
In this embodiment, the hole sealing pipe 2 is a flame-retardant and antistatic PVC pipe with a nominal pressure of 2 MPa. The hole sealing bag 4 adopts a flame-retardant antistatic filtering bag for efficiently filtering free water in grouting slurry. The grouting pipe 3 is a flame-retardant antistatic PE pipe formed by one-time thermoplastic coiling, the outer diameter is 16mm, the inner diameter is 12mm, and the wall thickness is 2 mm.
As shown in fig. 3, when the borehole 1 is plugged once, the plugging means near the outlet of the borehole 1 is grouted. The slurry enters the hole sealing bag 4 through the one-way valve 5, and the hole sealing bag 4 expands to seal the drill hole 1. And (4) continuing grouting, when the pressure of the slurry reaches the limit value of the explosion valve 6, opening the explosion valve 6, and allowing the slurry to enter the drill hole 1 between the two hole sealing bags 4 from the explosion valve 6. As shown in fig. 4, after the slurry in the sealing bag 4 and between the two sealing bags 4 is cured, one sealing of the borehole 1 is completed.
As shown in fig. 5, when the borehole 1 is plugged for the second time, the plugging unit near the air inlet end 7 of the plugging pipe 2 is grouted. The slurry enters the hole sealing bag 4 through the one-way valve 5, and the hole sealing bag 4 expands to seal the drill hole 1. And (4) continuing grouting, when the pressure of the slurry reaches the limit value of the explosion valve 6, opening the explosion valve 6, and allowing the slurry to enter the drill hole 1 between the two hole sealing bags 4 from the explosion valve 6. As shown in fig. 6, after the slurry in the sealing bag 4 and between the two sealing bags 4 is cured, the secondary sealing of the borehole 1 is completed.
Example 2
In this embodiment, the outer diameter of the hole sealing pipe 2 is 63mm, the wall thickness of the hole sealing pipe 2 is 7mm, and the inner diameter of the hole sealing pipe 2 is 49 mm.
Finally, the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all of them should be covered by the scope of the claims of the present invention.
Claims (4)
1. The utility model provides a gas drainage drilling big latus rectum secondary hole sealing device which characterized in that: the hole sealing device comprises hole sealing units and hole sealing pipes, wherein one end of each hole sealing pipe arranged in a drill hole is an air inlet end, the number of the hole sealing units is two, the two hole sealing units are arranged in the drill hole between the air inlet end and a drill hole outlet, the two hole sealing units are sequentially arranged along the extension direction of the drill hole, the outer diameter of each hole sealing pipe is larger than or equal to 50mm, each hole sealing unit comprises a grouting pipe and a hole sealing bag arranged on the grouting pipe, a one-way valve is arranged inside each hole sealing bag, and the grouting pipes are used for grouting into the hole sealing bags through the one-way valves;
the number of the hole sealing bags is 2, the 2 hole sealing bags are sequentially arranged along the grouting pipe, and the grouting pipe is also provided with an explosion valve which is arranged among the 2 hole sealing bags;
the external diameter of hole sealing pipe is 75mm, the wall thickness of hole sealing pipe is 8.30mm, the internal diameter of hole sealing pipe is 58.40 mm.
2. The large-drift-diameter secondary hole sealing device for the gas extraction drill hole according to claim 1, characterized in that: the hole sealing pipe is a continuous pipe.
3. The large-drift-diameter secondary hole sealing device for the gas extraction drill hole according to claim 1, characterized in that: the outer diameter and the inner diameter of the grouting pipe are respectively 16mm and 12 mm.
4. The large-drift-diameter secondary hole sealing device for the gas extraction drill hole according to claim 1, characterized in that: the length of the hole sealing bag is 1000 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023021929.2U CN214787298U (en) | 2020-12-15 | 2020-12-15 | Large-drift-diameter secondary hole sealing device for gas extraction drill hole |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023021929.2U CN214787298U (en) | 2020-12-15 | 2020-12-15 | Large-drift-diameter secondary hole sealing device for gas extraction drill hole |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214787298U true CN214787298U (en) | 2021-11-19 |
Family
ID=78711364
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202023021929.2U Active CN214787298U (en) | 2020-12-15 | 2020-12-15 | Large-drift-diameter secondary hole sealing device for gas extraction drill hole |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214787298U (en) |
-
2020
- 2020-12-15 CN CN202023021929.2U patent/CN214787298U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103075128B (en) | A kind of method for sealing of mash gas pumping drilling | |
| CN108119094A (en) | Deep fractures mash gas pumping drilling two blocks up one row's hole sealing device of a note and application method | |
| CN208122817U (en) | Deep fractures mash gas pumping drilling two blocks up one row's hole sealing device of a note | |
| WO2013056597A1 (en) | Gas extraction method and device with alternating extraction and injection | |
| CN107842352B (en) | Method for improving underground hydraulic fracturing permeability-increasing yield-increasing effect of coal mine | |
| CN104563958B (en) | A kind of hole sealing device | |
| CN111852392A (en) | Gas extraction borehole leak detection and progressive secondary hole sealing device and using method | |
| CN108104865A (en) | A kind of concordant drilling Anti-air-leakage gas pumping method | |
| CN104533336A (en) | Process and device for pre-grouting rubber matrix to seal soft coal seam gas drainage borehole | |
| CN108457693A (en) | A kind of slot injection hole sealing fixed-point booster expands infiltration method and structure | |
| CN103195470B (en) | Drilling construction Gas gathering-device | |
| CN102704986A (en) | Pressure-controlled hole sealing method for gas drainage hole | |
| CN113250670A (en) | Single-hole multi-section synchronous control fracturing coal body permeability increasing system and method | |
| CN216381316U (en) | Gas extraction hole sealing device | |
| CN205805503U (en) | Coal mine gas extraction drill hole band pressure grouting rapid hole packer | |
| CN214787298U (en) | Large-drift-diameter secondary hole sealing device for gas extraction drill hole | |
| CN103743304B (en) | Demolition set | |
| CN108757011A (en) | A kind of gas drilling plugging equipment and method based on the conjunction of positive-negative press seal bridging | |
| CN105317397A (en) | Double cloth bags type grouting sealing set and method | |
| CN112627762A (en) | Large-drift-diameter gas extraction drilling hole sealing device | |
| CN110685733B (en) | Pressurized hole sealing device for acid disturbance for coal mine and use method | |
| CN204314282U (en) | Detect the experimental provision of gas discharge drilling sealing material sealing property | |
| CN206693984U (en) | The long-armed pumping water into coal hole plugging equipment of extra-high voltage | |
| CN206233896U (en) | For the anti-pumping blocking of gas pumping and the outer plugging device of drainage holes | |
| CN111852391A (en) | Self-adaptive deformation gas extraction drilling and hole sealing device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |