CN109989726A - Cellular-type underground, which pinpoints syringe and its applies, is repairing the method in water supply well - Google Patents
Cellular-type underground, which pinpoints syringe and its applies, is repairing the method in water supply well Download PDFInfo
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- CN109989726A CN109989726A CN201811401720.3A CN201811401720A CN109989726A CN 109989726 A CN109989726 A CN 109989726A CN 201811401720 A CN201811401720 A CN 201811401720A CN 109989726 A CN109989726 A CN 109989726A
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- shell
- expander
- water supply
- syringe
- pinpoints
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 49
- 238000000034 method Methods 0.000 title claims abstract description 10
- 238000005276 aerator Methods 0.000 claims abstract description 18
- 238000005266 casting Methods 0.000 claims abstract description 17
- 230000010412 perfusion Effects 0.000 claims description 32
- 230000006578 abscission Effects 0.000 claims description 21
- 230000032798 delamination Effects 0.000 claims description 21
- 239000004568 cement Substances 0.000 claims description 17
- 239000002002 slurry Substances 0.000 claims description 6
- 239000003292 glue Substances 0.000 claims description 4
- 230000008602 contraction Effects 0.000 claims description 3
- 238000003384 imaging method Methods 0.000 claims description 3
- 238000003780 insertion Methods 0.000 claims description 3
- 230000037431 insertion Effects 0.000 claims description 3
- 239000003755 preservative agent Substances 0.000 claims description 3
- 230000002335 preservative effect Effects 0.000 claims description 3
- 238000013022 venting Methods 0.000 claims description 3
- 230000007423 decrease Effects 0.000 claims description 2
- 239000013589 supplement Substances 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 4
- 238000012423 maintenance Methods 0.000 abstract description 4
- 238000005516 engineering process Methods 0.000 abstract description 2
- 238000002347 injection Methods 0.000 abstract description 2
- 239000007924 injection Substances 0.000 abstract description 2
- 238000012986 modification Methods 0.000 abstract description 2
- 230000004048 modification Effects 0.000 abstract description 2
- 238000011084 recovery Methods 0.000 abstract description 2
- 239000011440 grout Substances 0.000 abstract 1
- 230000008961 swelling Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 5
- 208000034656 Contusions Diseases 0.000 description 3
- 238000005553 drilling Methods 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000018109 developmental process Effects 0.000 description 2
- 239000004576 sand Substances 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 241001074085 Scophthalmus aquosus Species 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 239000000284 extract Substances 0.000 description 1
- 238000005187 foaming Methods 0.000 description 1
- 239000003673 groundwater Substances 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
Classifications
-
- 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
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Pipe Accessories (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Abstract
The present invention relates to underground well tubular wall recovery technique fields, and specifically cellular-type underground, which pinpoints syringe and its applies, is repairing the method in water supply well, including underground device for casting, wellhead assembly, aerator；Underground device for casting both ends are equipped with expander；It is inflated by aerator to expander, makes underground device for casting above and below the loophole of water supply well after swelling, achieve the effect that repair loophole by wellhead assembly grout injection.Compared with the existing technology, structure is simple by the present invention, easy to use, quickly and effectively, can save maintenance cost for loophole fixed point maintenance, modification.
Description
Technical field
The present invention relates to underground well tubular wall recovery technique field, specifically cellular-type underground pinpoints syringe and its answers
Used in the method repaired in water supply well.
Background technique
In recent years, with the fast development of national economy and the increasingly raising of living standards of the people, groundwater resources are more next
More become the lifeblood of social development.In NW China water-deficient area, water supply well becomes the most important thing concerning the people's livelihood.But
Most of water supply wells often will appear after continuous work ten to decades and generate showing for hole since well inner sleeve corrodes
As, the appearance of hole frequently can lead to drift sand originally outside casing or gravel is drained in well by hole, water supply well is influenced
The normal work of interior water pump.These impacted water supply wells continue to extend with time of pumping, and the hole generated originally is just
Can be increasing, the serious drift sand that will lead to outside filter pipe of situation or gravel directly fill water supply well, eventually lead to water supply
Well is scrapped.
Summary of the invention
The purpose of the present invention is overcome the deficiencies of the prior art and provide a kind of fixed point that structure is simple and convenient to operate perfusion
Device is for modifying buried pipe leakage hole.
To achieve the above object, a kind of cellular-type underground fixed point syringe is designed, which is characterized in that be perfused and fill including underground
It sets, wellhead assembly, aerator；
--- the underground device for casting, including
The shell of hollow tube-shape；
The easy delamination of shell, is arranged on the outer wall of shell；
Expander, if two, it is separately fixed at the both ends of the shell；
The easy delamination of expander, is arranged on the outer wall of expander；
Perfusion supervisor includes at least straight-run of pipe portion and one section of bent portion, and the top of the straight sections is its input end,
The free end of the bent portion is its outlet end, and input end is located at outside the top of shell, remaining position is located in shell, and its
The side wall of shell is run through in outlet end；
Intermediate gas path device, inlet end are located at outside shell；Its outlet side sets there are two and is located at connection in shell
Corresponding expander circulates for gas, makes expander expansion or shrinkage；
--- the wellhead assembly, using tee tube, it is in a straight tube that wherein the first, second of tee tube is logical, second it is logical with
The input end assembly connection of the perfusion supervisor, third are common to connection slush pump；And first is logical equipped with the first valve, third
It is logical to be equipped with the second valve；Be initially positioned in the first valve and third it is logical between first it is logical in be additionally provided with resilient plug；
--- aerator, output end connect the inlet end of intermediate gas path device, provide gas source for intermediate gas path device.
Further, the easy delamination of the shell uses frangible shell abscission layer, and the outlet end of the perfusion supervisor is run through
The side wall of corresponding position shell abscission layer；
The easy delamination of expander uses frangible expander abscission layer.
Further, foamed glue is respectively adopted in the shell abscission layer, expander abscission layer.
Further, the shell abscission layer is in the taper that insertion end is narrow, outer end is wide.
Further, several layers preservative film is also coated outside the shell abscission layer.
Further, the expander includes supporter and the elastic balloon for being coated on supporter lateral wall.
Further, the supporter uses wheel hub, and the elastic balloon uses tire；
The perfusion supervisor uses three-port structure, the centre bore assembly of two logical corresponding positions and wheel hub；
The inlet end of the intermediate gas path device passes through the flower hole on wheel hub.
Further, the aerator comprising air filling gun is connected to the compressed air source unit of the input end of air filling gun, even
Connect the efferent duct in the outlet end of air filling gun；The efferent duct connects the inlet end of intermediate gas path device.
Further, the intermediate gas path device include three-way connection and be connected to it is each it is logical on tracheae.
Further, syringe, which is applied, is repairing the method in water supply well, it is characterised in that uses following steps:
A1, cooperated by downhole imaging, underground device for casting is placed at the loophole of water supply well, loophole is made to be located at two
Between a expander；
A2, make expander tensioner in water supply well to expander inflation through intermediate gas path device by aerator；
A3, by slush pump cement slurry is squeezed between two expanders and is located at the easy delamination of expander and water supply
Space between the inner wall of pipe well, then the loophole through water supply well are injected into outside the outer wall of water supply well and the outer wall of water supply well
Stratum between；
After a4, cement slurry have been infused, the first valve of wellhead assembly is opened, closes the second valve, resilient plug is utilized bar
Shape object is disclosed downwards and crosses the river conjunction of tee tube；
A5, it is then shut off the first valve, opens the second valve, clear water squeezed into perfusion supervisor using slush pump, elasticity
Plug rapid downlink under the hydraulic pressure pumped out, until to the straight sections of perfusion supervisor and the intersection of bent portion；
A6, close the second valve, build the pressure 8 hours or more, after cement initial set after can venting hydraulic pressure, if under during which air pressure has
Drop is supplemented at any time；
A7, after theing cement solidifies, the output end of the inlet end of intermediate gas path device and aerator is separated, so as to swollen
Gas after-contraction is discharged by the inlet end of intermediate gas path device in swollen body；
A8, expander contraction finish, logical by pull out wellhead assembly outward first, and pass through the easy delamination of shell and expander
Underground device for casting is extracted water supply well by easy delamination；
A9, then by grinding apparatus be inserted into water supply well in, the extra cement layer that will protrude above water supply well inner wall is beaten
It grinds off.
Compared with the existing technology, structure is simple by the present invention, easy to use, can be for loophole fixed point maintenance, and modification is quick
Effectively, maintenance cost is saved.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of underground device for casting in the present invention.
Fig. 2 is the structural schematic diagram of the wellhead assembly in the present invention.
Fig. 3 is the structural schematic diagram of aerator in the present invention.
Fig. 4 is the structural schematic diagram of resilient plug in the present invention.
Fig. 5 is the structural schematic diagram of the underground device for casting in the present invention at work.
Fig. 6 is the horizontal cut-away view in the present invention at the expander of perfusion supervisor side.
Specific embodiment
The present invention is further described now in conjunction with attached drawing.
Embodiment 1
Referring to FIG. 1 to FIG. 5, a kind of cellular-type underground of the present invention pinpoints syringe, which is characterized in that is perfused and fills including underground
It sets, wellhead assembly, aerator；
--- the underground device for casting, including
The shell 1 of hollow tube-shape；It can be used in this exampleSteel pipe；
The easy delamination of shell, is arranged on the outer wall of shell 1；
Expander 3, if two, it is separately fixed at the both ends of the shell 1；
The easy delamination of expander, is arranged on the outer wall of expander 3；
Perfusion supervisor 2, includes at least straight-run of pipe portion and one section of bent portion, and the top of the straight sections is its import
The free end at end, the bent portion is its outlet end, and input end is located at outside the top of shell, remaining position is located in shell 1,
And the side wall of shell 1 is run through in its outlet end；Drilling rod can be used in the straight tube of perfusion supervisor 2 in this example；And perfusion supervisor 2 can in this example
Using the three-port structure of ф 50, bottom end can set capping, convenient for removing the cement block in perfusion supervisor 2 future, expand in this way
Body 3 can also be further secured on the bottom end of perfusion supervisor 2 in the future other than being fixed on shell 1, make expander installation more
Securely；Certainly broken pipe also can be directly used in perfusion supervisor 2；
Intermediate gas path device 4, inlet end are located at outside shell 1；Its outlet side, which sets there are two and is located in shell 1, to be connected
Corresponding expander is connect, gas path device 4 intermediate in this way, which compares, to be less likely to be damaged, structurally reasonable；It is used for gas circulation, makes to expand
3 expansion or shrinkage of body；
--- the wellhead assembly 5, using the tee tube 5-1 of ф 50, it is in one that wherein the first, second of tee tube 5-1 is logical
2 input end assembly connection is responsible in straight tube, the second logical and described perfusion, and the input end of perfusion supervisor 2 connects equipped with assembly in this example
The second go side head of head, wellhead assembly also is provided with corresponding connector, facilitates two fixed installations, the two can use screw thread certainly
Connection, logical be attached on drilling machine of the first of wellhead assembly facilitate rotation, lower brill and rising, XY-6 type drilling machine, well head can be used
The third of device is common to connection slush pump, and BW250 slush pump can be used；And first is logical logical equipped with the first valve 5-2, third
It is equipped with the second valve 5-3；Be initially positioned in the first valve 5-2 and third it is logical between first it is logical in be additionally provided with resilient plug 5-
4, referring to fig. 4, resilient plug 5-4 uses rubber umbrella plug, rubber umbrella plug good seal performance, and its head court when installation in this example
Under, tail portion is convenient for gliding upward, naturally it is also possible to set drawstring on the head of resilient plug 5-4；Rubber umbrella plug in free state,
First, second logical and perfusion supervisor 2 internal diameter of the umbrella diameter greater than tee tube 5-1, and its length is greater than the outlet end of perfusion supervisor 2
Internal diameter；Third between the river conjunction and the second valve 5-3 of tee tube 5-1, which is led to, is additionally provided with pressure gauge 5-5；
--- aerator 6, output end connect the inlet end of intermediate gas path device 4, provide gas for intermediate gas path device 4
Source.
Further, the easy delamination of the shell uses frangible shell abscission layer 7, and the outlet end of the perfusion supervisor 2 is passed through
Wear the side wall of corresponding position shell abscission layer 7；
The easy delamination of expander uses frangible expander abscission layer 8.
Further, foamed glue is respectively adopted in the shell abscission layer 7, expander abscission layer 8, and foamed glue compares after by external force
It is easier to be crushed.In addition, the outer wall of syringe generally uses steel pipe in this case, surface can guarantee smooth；But the borehole wall is generally simultaneously
It is not smooth face, foaming layer may also function as the effect in the gap between the filling borehole wall and shell 1, it is ensured that form closed ring
Border.
Further, the shell abscission layer 7 facilitates underground device for casting in the taper that insertion end is narrow, outer end is wide
It extracts.
Further, several layers preservative film is also coated outside the shell abscission layer 7.Play the role of convenient for being detached from, simultaneously
Also function to the effect in gap between the filling borehole wall and shell, it is ensured that the not spillage from gap in cement injection.
Further, the expander 3 includes the supporter 3-1 and elastic balloon 3-2 for being coated on supporter lateral wall.
Further, the supporter 3-1 uses wheel hub, and the automotive hub that diameter is 285mm, institute can be used in this example
Elastic balloon 3-2 is stated using tire；The perfusion supervisor 2 uses three-port structure, the centre bore of two logical corresponding positions and wheel hub
Assembly；The inlet end of the intermediate gas path device 4 passes through the flower hole on wheel hub.
Further, the aerator 6 comprising air filling gun 6-1 is connected to the compressed air source unit of the input end of air filling gun
6-2 is connected to the efferent duct 6-3 of the outlet end of air filling gun；The inlet end of the intermediate gas path device 4 of the efferent duct 6-3 connection.This
Air pump or inflator can be used in compressed air source unit 6-2 in example.
Further, the intermediate gas path device 4 includes the three-way connection 4-1 and tracheae 4-2 being connected on each lead to.
Tracheae uses the hose of 10 × 6.5 × 100m in this example.
Further, syringe, which is applied, is repairing the method in water supply well, it is characterised in that uses following steps:
A1, cooperated by downhole imaging, underground device for casting is placed at the loophole of water supply well, loophole is made to be located at two
Between a expander 3；
A2, make 3 tensioner of expander in water supply well to the inflation of expander 3 through intermediate gas path device 4 by aerator 6
It is interior；It, can be to its inflation to 2.5MPa if elastic balloon 3-2 uses tire in this example；
A3, by slush pump cement slurry is squeezed between two expanders 3 and is located at the easy delamination of expander and confession
Space between the inner wall of water pipe manhole, then the loophole through water supply well are injected into the outer wall of water supply well and the outer wall of water supply well
Between outer stratum；
After a4, cement slurry have been infused, the first valve 5-2 of wellhead assembly is opened, the second valve 5-3 is closed, resilient plug
5-4 is disclosed downwards using shaft and is crossed the river conjunction of tee tube；
A5, it is then shut off the first valve 5-2, opens the second valve 5-3, clear water is squeezed into perfusion supervisor 2 using slush pump
It is interior, resilient plug 5-4 rapid downlink under the hydraulic pressure pumped out, until to the straight sections of perfusion supervisor 2 and the intersection of bent portion；One
As if perfusion supervisor 2 use three-way pipe structure, resilient plug 5-4, which is delivered to river conjunction, can generate bruising phenomenon, and bruising is existing
As can be shown by pressure gauge 5-5, then proceedes to be forced into pressure gauge and rise to 4MPA or so；If perfusion supervisor 2 is using folding
Pipe, then resilient plug 5-4, which is delivered to curved mouth, can block the access of perfusion supervisor 2, and it is existing to be shown as bruising by pressure gauge 5-5 at this time
As；
A6, close the second valve 5-3, build the pressure 8 hours or more, after cement initial set after can venting hydraulic pressure, if during which air pressure
There is decline to supplement at any time；Referring to the effect that Fig. 5 is in the device for casting of underground after 2 closing of perfusion supervisor.
A7, after theing cement solidifies, the output end of the inlet end and aerator 6 of intermediate gas path device 4 is separated, so as to
Gas after-contraction is discharged by the inlet end of intermediate gas path device 4 in expander 3；
A8, the contraction of expander 3 finish, logical by pull out wellhead assembly 5 outward first, and pass through the easy delamination of shell and expansion
Underground device for casting is extracted water supply well by the easy delamination of body；
A9, then by grinding apparatus be inserted into water supply well in, the extra cement layer that will protrude above water supply well inner wall is beaten
It grinds off.
After the completion of repairing, lower pump carries out verifying of drawing water after 72 hours, and the static level, dynamic water level and individual well after well workover go out
Water reaches the standard when well works normally.
Claims (10)
1. a kind of cellular-type underground pinpoints syringe, which is characterized in that including underground device for casting, wellhead assembly, aerator；
--- the underground device for casting, including
The shell (1) of hollow tube-shape；
The easy delamination of shell is arranged on the outer wall of shell (1)；
Expander (3), if two, it is separately fixed at the both ends of the shell (1)；
The easy delamination of expander is arranged on the outer wall of expander (3)；
Perfusion supervisor (2) includes at least straight-run of pipe portion and one section of bent portion, and the top of the straight sections is its input end,
The free end of the bent portion is its outlet end, and input end is located at outside the top of shell, remaining position is located in shell (1),
And the side wall of shell is run through in its outlet end；
Intermediate gas path device (4), inlet end are located at shell (1) outside；Its outlet side sets there are two and is located in shell (1)
Corresponding expander is connected, circulates for gas, makes expander (3) expansion or shrinkage；
--- the wellhead assembly (5), using tee tube (5-1), it is in a straight tube that wherein the first, second of tee tube (5-1) is logical,
The second logical input end assembly connection with the perfusion supervisor (2), third are common to connection slush pump；And first is logical equipped with the
One valve (5-2), third are logical to be equipped with the second valve (5-3)；Be initially positioned in the first valve (5-2) and third it is logical between the
One it is logical in be additionally provided with resilient plug (5-4)；
--- aerator (6), output end connect the inlet end of intermediate gas path device (4), provide for intermediate gas path device (4)
Gas source.
2. a kind of cellular-type underground as described in claim 1 pinpoints syringe, which is characterized in that
The easy delamination of shell uses frangible shell abscission layer (7), and the outlet end of the perfusion supervisor (2) is outside corresponding position
The side wall of shell abscission layer (7)；
The easy delamination of expander uses frangible expander abscission layer (8).
3. a kind of cellular-type underground as claimed in claim 2 pinpoints syringe, which is characterized in that the shell abscission layer (7),
Foamed glue is respectively adopted in expander abscission layer (8).
4. a kind of cellular-type underground as claimed in claim 2 pinpoints syringe, which is characterized in that the shell abscission layer
(7) in the taper that insertion end is narrow, outer end is wide.
5. a kind of cellular-type underground as claimed in claim 2 pinpoints syringe, which is characterized in that the shell abscission layer (7)
Several layers preservative film is also coated outside.
6. a kind of cellular-type underground as described in claim 1 pinpoints syringe, which is characterized in that the expander (3) includes
Supporter (3-1) and the elastic balloon (3-2) for being coated on supporter lateral wall.
7. a kind of cellular-type underground as claimed in claim 6 pinpoints syringe, which is characterized in that
The supporter (3-1) uses wheel hub, and the elastic balloon (3-2) uses tire；
The perfusion supervisor (2) uses three-port structure, the centre bore assembly of two logical corresponding positions and wheel hub；
The inlet end of the intermediate gas path device (4) passes through the flower hole on wheel hub.
8. a kind of cellular-type underground as described in claim 1 pinpoints syringe, which is characterized in that the aerator (6),
Including air filling gun (6-1), it is connected to the compressed air source unit (6-2) of the input end of air filling gun, is connected to the defeated of the outlet end of air filling gun
Outlet pipe (6-3)；The efferent duct (6-3) connects the inlet end of intermediate gas path device (4).
9. a kind of cellular-type underground as described in claim 1 pinpoints syringe, which is characterized in that the intermediate gas path device
(4) tracheae (4-2) for including three-way connection (4-1) and being connected on each lead to.
10. the syringe as described in any one of claim 1~9, which is applied, is repairing the method in water supply well, it is characterised in that adopt
With following steps:
A1, cooperated by downhole imaging, underground device for casting is placed at the loophole of water supply well, keep loophole swollen positioned at two
Between swollen body (3)；
A2, make expander (3) tensioner in water supplying pipe to expander (3) inflation through intermediate gas path device (4) by aerator (6)
In well；
A3, by slush pump cement slurry is squeezed between two expanders (3) and is located at the easy delamination of expander and water supply
Space between the inner wall of pipe well, then the loophole through water supply well are injected into outside the outer wall of water supply well and the outer wall of water supply well
Stratum between；
After a4, cement slurry have been infused, the first valve (5-2) of wellhead assembly is opened, is closed the second valve (5-3), resilient plug
(5-4) is disclosed downwards using shaft and is crossed the river conjunction of tee tube 5-1；
A5, it is then shut off the first valve (5-2), opens the second valve (5-3), clear water is squeezed into perfusion supervisor using slush pump
(2) in, resilient plug (5-4) rapid downlink under the hydraulic pressure pumped out, until to the straight sections of perfusion supervisor (2) and the friendship of bent portion
At remittance；
A6, close the second valve (5-3), build the pressure 8 hours or more, after cement initial set after can venting hydraulic pressure, if during which air pressure has
Decline supplements at any time；
A7, after theing cement solidifies, the inlet end of intermediate gas path device (4) and the output end of aerator (6) are separated, so as to
Gas after-contraction is discharged by the inlet end of intermediate gas path device (4) in expander (3)；
A8, expander (3) contraction finish, logical by pull out wellhead assembly (5) outward first, and pass through the easy delamination of shell and expansion
Underground device for casting is extracted water supply well by the easy delamination of body；
A9, then by grinding apparatus be inserted into water supply well in, the extra cement layer that will protrude above water supply well inner wall polishes off.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811401720.3A CN109989726B (en) | 2018-11-22 | 2018-11-22 | Divided downhole fixed-point injector and method for repairing water supply pipe well by using same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811401720.3A CN109989726B (en) | 2018-11-22 | 2018-11-22 | Divided downhole fixed-point injector and method for repairing water supply pipe well by using same |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109989726A true CN109989726A (en) | 2019-07-09 |
| CN109989726B CN109989726B (en) | 2024-06-11 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201811401720.3A Active CN109989726B (en) | 2018-11-22 | 2018-11-22 | Divided downhole fixed-point injector and method for repairing water supply pipe well by using same |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112814609A (en) * | 2021-01-05 | 2021-05-18 | 河南理工大学 | A sealed stopper device of recoverable formula for coal seam roof reinforcing operation |
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| CN112814609B (en) * | 2021-01-05 | 2023-02-21 | 平顶山学院 | A sealed stopper device of recoverable formula for coal seam roof reinforcing operation |
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