CN109989726B - Divided downhole fixed-point injector and method for repairing water supply pipe well by using same - Google Patents
Divided downhole fixed-point injector and method for repairing water supply pipe well by using same Download PDFInfo
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- CN109989726B CN109989726B CN201811401720.3A CN201811401720A CN109989726B CN 109989726 B CN109989726 B CN 109989726B CN 201811401720 A CN201811401720 A CN 201811401720A CN 109989726 B CN109989726 B CN 109989726B
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 58
- 238000000034 method Methods 0.000 title abstract description 6
- 230000010412 perfusion Effects 0.000 claims abstract description 43
- 239000004568 cement Substances 0.000 claims abstract description 21
- 239000002002 slurry Substances 0.000 claims abstract description 18
- 238000005086 pumping Methods 0.000 claims description 11
- 230000032798 delamination Effects 0.000 claims description 10
- 238000005498 polishing Methods 0.000 claims description 6
- 238000007599 discharging Methods 0.000 claims description 5
- 229920001821 foam rubber Polymers 0.000 claims description 3
- 238000001802 infusion 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
- 238000012423 maintenance Methods 0.000 abstract description 4
- 230000000694 effects Effects 0.000 abstract description 2
- 238000012986 modification Methods 0.000 abstract description 2
- 230000004048 modification Effects 0.000 abstract description 2
- 229920001971 elastomer Polymers 0.000 description 8
- 238000005553 drilling Methods 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005187 foaming Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 239000004576 sand Substances 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 241001391944 Commicarpus scandens Species 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 239000003673 groundwater Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 239000002349 well water Substances 0.000 description 1
- 235000020681 well water Nutrition 0.000 description 1
Classifications
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- 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
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- 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)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
- Pipe Accessories (AREA)
Abstract
The invention relates to the technical field of underground well pipe wall restoration, in particular to a separated underground fixed-point perfusion device and a method for applying the same in a water supply pipe well repair, wherein the separated underground fixed-point perfusion device comprises an underground perfusion device, a wellhead device and an air-entrapping device; the two ends of the downhole perfusion device are provided with expansion bodies; and the inflatable body is inflated through the air-filling device, so that after the underground filling device is inflated up and down at the leak of the water supply pipe well, the effect of repairing the leak is achieved by filling cement slurry through the wellhead device. Compared with the prior art, the device has the advantages of simple structure, convenient use, quick and effective modification aiming at fixed-point maintenance of the loopholes and maintenance cost saving.
Description
Technical Field
The invention relates to the technical field of underground well pipe wall repair, in particular to a separated underground fixed-point perfusion apparatus and a method for repairing a water supply pipe well by using the same.
Background
In recent years, with the rapid development of national economy and the increasing of the living standard of people, groundwater resources become increasingly the pulse for social development. In water deficient areas, water supply pipe wells become a serious concern for civilians. However, after the water supply pipe well works continuously for ten to several decades, holes are often generated due to corrosion of the inner sleeve of the water supply pipe well, and the holes often cause sand or gravel originally outside the sleeve to leak into the water supply pipe well through the holes, so that the normal operation of the water pump in the water supply pipe well is affected. The affected water supply wells are prolonged along with the continuous water pumping time, the holes generated originally are larger and larger, and the serious condition can lead to the sand or gravel outside the water filtering pipe to directly fill the water supply well, and finally lead to the scrapping of the water supply well.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides the fixed-point perfusion device which has a simple structure and is convenient to operate and is used for modifying the underground pipe well leak.
In order to achieve the aim, the separated underground fixed-point perfusion apparatus is designed and is characterized by comprising an underground perfusion device, a wellhead device and an air-entraining device;
-said downhole infusion device comprising
A hollow cylindrical housing;
the shell is easy to delaminate and is arranged on the outer wall of the shell;
the expansion bodies are arranged at two ends of the shell and are respectively fixed at the two ends of the shell;
The expansion body is easy to delaminate and is arranged on the outer wall of the expansion body;
The perfusion main pipe at least comprises a section of straight pipe part and a section of bent pipe part, wherein the top end of the straight pipe part is the inlet end of the straight pipe part, the free end of the bent pipe part is the outlet end of the bent pipe part, the inlet end is positioned outside the top end of the shell, the rest parts are positioned in the shell, and the outlet end of the bent pipe part penetrates through the side wall of the shell;
the air inlet end of the middle air path device is positioned outside the shell; the air outlet end of the middle air path device is provided with two expansion bodies which are respectively positioned in the shell and connected with the corresponding expansion bodies for air circulation, so that the expansion bodies expand or contract;
The wellhead device adopts a three-way pipe, wherein a first port and a second port of the three-way pipe are straight pipes, the second port is assembled and connected with the inlet end of the main filling pipe, and a third port is used for connecting a slurry pump; the first valve is arranged on the first port, and the second valve is arranged on the third port; an elastic plug is arranged in the first passage between the first valve and the third passage at the beginning;
The output end of the air adding device is connected with the air inlet end of the middle air channel device to provide an air source for the middle air channel device.
Furthermore, the shell is easy to delaminate and adopts a fragile shell release layer, and the outlet end of the perfusion main pipe penetrates through the side wall of the shell release layer at the corresponding position;
the expansion body is easy to delaminate, and a fragile expansion body release layer is adopted.
Further, the shell release layer and the expansion body release layer are respectively made of foaming glue.
Further, the shell release layer is tapered with a narrow insertion end and a wide outer end.
Furthermore, the shell is also coated with a plurality of layers of preservative films outside the release layer.
Further, the expansion body comprises a support body and an elastic air bag coated on the outer side wall of the support body.
Further, the support body adopts a hub, and the elastic air bag adopts a tire;
the perfusion main pipe adopts a three-way structure, and the corresponding parts of the two passages of the perfusion main pipe are assembled with the central hole of the hub;
The air inlet end of the middle air path device passes through the flower hole on the hub.
Further, the air adding device comprises an air adding gun, an air source device connected to the inlet end of the air adding gun and an output pipe connected to the outlet end of the air adding gun; the output pipe is connected with the air inlet end of the middle air path device.
Further, the intermediate gas path device comprises a three-way joint and a gas pipe connected to each of the two channels.
Further, the method for applying the perfusion device in repairing the water supply tube well is characterized by adopting the following steps:
a1, placing an underground pouring device at a leak of a water supply pipe well through underground shooting matching, so that the leak is positioned between two expansion bodies;
a2, inflating gas to the expansion body through the gas inflating device by using the middle gas path device to enable the expansion body to be tightly inflated in the water supply pipe well;
a3, pumping cement slurry into a space between the two expansion bodies and between the easy delamination of the expansion bodies and the inner wall of the water supply pipe well through a slurry pump, and injecting the cement slurry between the outer wall of the water supply pipe well and a stratum outside the outer wall of the water supply pipe well through a leak of the water supply pipe well;
a4, after the cement paste is injected, opening a first valve of the wellhead device, closing a second valve, poking down the elastic plug by using the rod-shaped object and crossing the junction of the three-way pipe;
A5, closing the first valve, opening the second valve, pumping clean water into the pouring main pipe by using the slurry pump, and enabling the elastic plug to rapidly descend under the pumped water pressure until reaching the junction of the straight pipe part and the bent pipe part of the pouring main pipe;
A6, closing the second valve, holding the pressure for more than 8 hours, and discharging the water pressure after the cement is initially set, wherein the air pressure can be supplemented at any time if the air pressure is reduced;
a7, after the cement is solidified, separating the air inlet end of the middle air channel device from the output end of the air adding device so that the expansion body contracts after discharging the air through the air inlet end of the middle air channel device;
a8, after the expansion body is contracted, pulling the downhole filling device out of the water supply pipe well through a first through of the wellhead device outwards and through easy delamination of the shell and easy delamination of the expansion body;
a9, inserting polishing equipment into the water supply pipe well, and polishing off the superfluous cement layer protruding out of the inner wall of the water supply pipe well.
Compared with the prior art, the device has the advantages of simple structure, convenient use, quick and effective modification aiming at fixed-point maintenance of the loopholes and maintenance cost saving.
Drawings
FIG. 1 is a schematic diagram of a downhole pumping device according to the present invention.
Fig. 2 is a schematic view of the wellhead assembly of the present invention.
Fig. 3 is a schematic structural view of the air-entraining device in the present invention.
Fig. 4 is a schematic structural view of the elastic plug according to the present invention.
Fig. 5 is a schematic diagram of a downhole pumping device in operation according to the present invention.
Fig. 6 is a horizontal sectional view of the invention at the expansion body on the perfusion main pipe side.
Detailed Description
The invention will now be further described with reference to the accompanying drawings.
Example 1
Referring to fig. 1 to 5, the invention relates to a separated underground fixed-point perfusion apparatus, which is characterized by comprising an underground perfusion device, a wellhead device 5 and an air-entraining device 6;
-said downhole infusion device comprising
A hollow cylindrical housing 1; in the example, phi 273 steel pipes can be adopted;
the shell is easy to delaminate and is arranged on the outer wall of the shell 1;
the expansion bodies 3 are arranged in two and are respectively fixed at two ends of the shell 1;
The expansion body is easy to delaminate and is arranged on the outer wall of the expansion body 3;
The perfusion main pipe 2 at least comprises a section of straight pipe part and a section of bent pipe part, wherein the top end of the straight pipe part is the inlet end of the straight pipe part, the free end of the bent pipe part is the outlet end of the bent pipe part, the inlet end is positioned outside the top end of the shell, the rest parts are positioned in the shell 1, and the outlet end of the bent pipe part penetrates through the side wall of the shell 1; in the embodiment, a straight pipe of the perfusion main pipe 2 can adopt a drill rod; in the embodiment, the perfusion main pipe 2 can adopt a tee joint structure with the diameter of 50, and the bottom end of the perfusion main pipe can be provided with a sealing cover, so that cement blocks in the perfusion main pipe 2 can be removed in future, and the expansion body 3 can be further fixed on the bottom end of the perfusion main pipe 2 besides being fixed on the shell 1, so that the expansion body is more firmly installed; of course, the perfusion main pipe 2 can also be a folded pipe directly;
The air inlet end of the middle air path device 4 is positioned outside the shell 1; the two air outlet ends are respectively positioned in the shell 1 and connected with corresponding expansion bodies, so that the middle air passage device 4 is not easy to damage and has reasonable structure; for gas communication, expanding or contracting the expansion body 3;
The first and second ends of the tee pipe 5-1 are straight pipes, the second end is connected with the inlet end of the perfusion main pipe 2 in an assembling way, the inlet end of the perfusion main pipe 2 is provided with an assembling joint in the embodiment, the second end of the wellhead is also provided with a corresponding joint, two fixed installation is facilitated, of course, the two fixed installation joints can be connected by threads, the first end of the wellhead can be connected on a drilling machine for convenient rotation, drilling and lifting, an XY-6 type drilling machine can be adopted, the third end of the wellhead is used for connecting a slurry pump, and a BW250 slurry pump can be adopted; the first valve 5-2 is arranged on the first port, and the second valve 5-3 is arranged on the third port; an elastic plug 5-4 is arranged in the first passage between the first valve 5-2 and the third passage at first, as shown in fig. 4, in the example, the elastic plug 5-4 is a rubber umbrella plug, the sealing performance of the rubber umbrella plug is good, the head part of the rubber umbrella plug is downward, the tail part of the rubber umbrella plug is upward and is convenient to slide downwards when the rubber umbrella plug is installed, and a pull rope can be arranged at the head part of the elastic plug 5-4; when the rubber umbrella plug is in a free state, the umbrella diameter of the rubber umbrella plug is larger than the inner diameters of the first and second through pipes of the three-way pipe 5-1 and the pouring main pipe 2, and the length of the rubber umbrella plug is larger than the inner diameter of the outlet end of the pouring main pipe 2; a third tee joint between the intersection of the tee pipe 5-1 and the second valve 5-3 is also provided with a pressure gauge 5-5;
The output end of the air adding device 6 is connected with the air inlet end of the middle air channel device 4 to provide an air source for the middle air channel device 4.
Further, the shell is easy to delaminate and adopts a fragile shell release layer 7, and the outlet end of the perfusion main pipe 2 penetrates through the side wall of the shell release layer 7 at the corresponding position;
The expansion body is susceptible to delamination by the use of a frangible expansion body release layer 8.
Further, the shell release layer 7 and the expansion body release layer 8 are respectively made of foam rubber, and the foam rubber is easy to break after being subjected to external force. In addition, the outer wall of the perfusion apparatus in the scheme is generally made of steel pipes, and the surface can be ensured to be smooth; however, the well wall is not a smooth surface, and the foaming layer can also play a role of filling gaps between the well wall and the shell 1, so that a closed environment is formed.
Furthermore, the shell release layer 7 is in a cone shape with a narrow insertion end and a wide outer end, so that the underground perfusion device is convenient to pull out.
Furthermore, the shell release layer 7 is also coated with a plurality of layers of preservative films. Plays a role in facilitating detachment, and also plays a role in filling gaps between the well wall and the shell, so that slurry is not leaked from the gaps during cement filling.
Further, the expansion body 3 comprises a support body 3-1 and an elastic air bag 3-2 coated on the outer side wall of the support body.
Further, the support body 3-1 adopts a hub, in this example, an automobile hub with a diameter of 285mm can be adopted, and the elastic air bag 3-2 adopts a tire; the perfusion main pipe 2 adopts a three-way structure, and the corresponding parts of the two passages of the perfusion main pipe are assembled with the central hole of the hub; the air inlet end of the middle air path device 4 passes through the flower hole on the hub.
Further, the air filling device 6 comprises an air filling gun 6-1, an air source device 6-2 connected to the inlet end of the air filling gun, and an output pipe 6-3 connected to the outlet end of the air filling gun; the output pipe 6-3 is connected with the air inlet end of the middle air passage device 4. The air source device 6-2 in this example may be an air pump or an inflator.
Further, the intermediate gas path device 4 comprises a three-way joint 4-1 and a gas pipe 4-2 connected to each passage. In this case, the air tube uses 10×6.5×100m hoses.
Further, the method for applying the perfusion device in repairing the water supply tube well is characterized by adopting the following steps:
a1, placing an underground pouring device at a leak of a water supply pipe well through underground shooting matching, so that the leak is positioned between two expansion bodies 3;
a2, inflating the expansion body 3 through the air-filling device 6 by the middle air path device 4 to enable the expansion body 3 to be tightly tensioned in the water supply pipe well; in this example, if the elastic air bag 3-2 adopts a tire, the tire can be inflated to 2.5MPa;
a3, pumping cement slurry into a space between the two expansion bodies 3 and between the easy delamination of the expansion bodies and the inner wall of the water supply pipe well through a slurry pump, and injecting the cement slurry between the outer wall of the water supply pipe well and a stratum outside the outer wall of the water supply pipe well through a leak of the water supply pipe well;
a4, after the cement paste is injected, opening a first valve 5-2 of the wellhead device, closing a second valve 5-3, and poking down an elastic plug 5-4 by using a rod-shaped object and crossing the junction of the three-way pipe;
a5, closing the first valve 5-2, opening the second valve 5-3, pumping clean water into the pouring main pipe 2 by using a slurry pump, and quickly descending the elastic plug 5-4 under the pumped water pressure until reaching the junction of the straight pipe part and the bent pipe part of the pouring main pipe 2; generally, if the perfusion main pipe 2 adopts a three-way pipe structure, the elastic plug 5-4 can generate a collision pressure phenomenon when being conveyed to the junction, the collision pressure phenomenon can be displayed through the pressure gauge 5-5, and then the pressure gauge is continuously pressurized until the pressure gauge is increased to about 4 MPA; if the perfusion main pipe 2 adopts a folded pipe, the elastic plug 5-4 can be conveyed to the bent port to block the passage of the perfusion main pipe 2, and the pressure gauge 5-5 can display the collision phenomenon;
a6, closing the second valve 5-3, holding the pressure for more than 8 hours, and discharging the water pressure after the cement is initially set, wherein the air pressure can be supplemented at any time if the air pressure is reduced; referring to fig. 5, the effect of the sealing of the main perfusion tube 2 in the downhole perfusion apparatus is shown.
A7, after the cement is solidified, separating the air inlet end of the middle air path device 4 from the output end of the air adding device 6 so that the expansion body 3 can shrink after discharging the air through the air inlet end of the middle air path device 4;
a8, after the expansion body 3 is contracted, pulling the downhole filling device out of the water supply pipe well through the first through of the wellhead device 5 outwards and the easy delamination of the casing and the easy delamination of the expansion body;
a9, inserting polishing equipment into the water supply pipe well, and polishing off the superfluous cement layer protruding out of the inner wall of the water supply pipe well.
After the repair is completed, pumping is performed by pumping after 72 hours, and the static water level, the dynamic water level and the single well water yield after the well repair all reach the standard when the well works normally.
Claims (9)
1. The separated underground fixed-point perfusion apparatus is characterized by comprising an underground perfusion device, a wellhead device (5) and an air-entraining device (6);
-said downhole infusion device comprising
A hollow cylindrical housing (1);
the shell is easy to delaminate and is arranged on the outer wall of the shell (1);
The expansion bodies (3) are arranged at two ends of the shell (1) respectively;
the expansion body is easy to delaminate and is arranged on the outer wall of the expansion body (3);
The perfusion main pipe (2) at least comprises a section of straight pipe part and a section of bent pipe part, the top end of the straight pipe part is the inlet end of the straight pipe part, the free end of the bent pipe part is the outlet end of the bent pipe part, the inlet end is positioned outside the top end of the shell, the rest parts are positioned in the shell (1), and the outlet end of the bent pipe part penetrates through the side wall of the shell;
The middle air passage device (4), the air inlet end of the middle air passage device (4) is positioned outside the shell (1); the air outlet end of the middle air path device (4) is provided with two expansion bodies which are respectively positioned in the shell (1) and connected with the corresponding expansion bodies for air circulation, so that the expansion bodies (3) are expanded or contracted;
-the wellhead device (5) adopts a three-way pipe (5-1), wherein a first through and a second through of the three-way pipe (5-1) are straight pipes, the second through is assembled and connected with the inlet end of the main filling pipe (2), and a third through is used for connecting a slurry pump; the first valve (5-2) is arranged on the first port, and the second valve (5-3) is arranged on the third port; an elastic plug (5-4) is arranged in the first passage between the first valve (5-2) and the third passage at the beginning;
The output end of the air adding device (6) is connected with the air inlet end of the middle air channel device (4) to provide an air source for the middle air channel device (4);
The perfusion apparatus is used for repairing a water supply pipe well by the following steps:
a1, placing an underground pouring device at a leak of a water supply pipe well through underground shooting matching, so that the leak is positioned between two expansion bodies (3);
a2, inflating the expansion body (3) through the air-filling device (6) through the middle air path device (4) to enable the expansion body (3) to be tightly tensioned in the water supply pipe well;
a3, pumping cement slurry into a space between the two expansion bodies (3) and between the easy delamination of the expansion bodies and the inner wall of the water supply pipe well through a slurry pump, and injecting the cement slurry between the outer wall of the water supply pipe well and a stratum outside the outer wall of the water supply pipe well through a leak of the water supply pipe well;
A4, after the cement paste is injected, opening a first valve (5-2) of the wellhead device, closing a second valve (5-3), and poking down an elastic plug (5-4) by a rod-shaped object and crossing the junction of a three-way pipe (5-1);
a5, then closing the first valve (5-2), opening the second valve (5-3), pumping clean water into the main pouring pipe (2) by using a slurry pump, and quickly descending the elastic plug (5-4) under the pumped water pressure until reaching the junction of the straight pipe part and the bent pipe part of the main pouring pipe (2);
A6, closing a second valve (5-3), holding the pressure for more than 8 hours, and discharging the water pressure after the cement is initially set, wherein if the air pressure is reduced, the air pressure is replenished at any time;
a7, after the cement is solidified, separating the air inlet end of the middle air channel device (4) from the output end of the air adding device (6) so that the expansion body (3) can shrink after exhausting air through the air inlet end of the middle air channel device (4);
a8, after the expansion body (3) is contracted, pulling out the water supply pipe well from the downhole pouring device through a first through of the wellhead device (5) outwards and through easy delamination of the shell and easy delamination of the expansion body;
a9, inserting polishing equipment into the water supply pipe well, and polishing off the superfluous cement layer protruding out of the inner wall of the water supply pipe well.
2. A divided downhole fixed point injector according to claim 1,
The shell is easy to delaminate and adopts a fragile shell release layer (7), and the outlet end of the perfusion main pipe (2) penetrates through the side wall of the shell release layer (7) at the corresponding position;
the expansion body is easy to delaminate by adopting a fragile expansion body release layer (8).
3. A divided downhole fixed point syringe according to claim 2, wherein the casing release layer (7) and the expansion body release layer (8) are respectively made of foam rubber.
4. A divided downhole fixed point syringe according to claim 2, wherein the casing release layer (7) has a conical shape with a narrow insertion end and a wide outer end.
5. A divided downhole fixed point injector according to claim 2, wherein the casing release layer (7) is further coated with a number of layers of preservative film.
6. A divided downhole fixed point syringe according to claim 1, wherein the inflatable body (3) comprises a support body (3-1) and an elastic balloon (3-2) wrapped around the outer side wall of the support body.
7. A divided downhole fixed point injector according to claim 6, wherein,
The support body (3-1) adopts a hub, and the elastic air bag (3-2) adopts a tire;
The perfusion main pipe (2) adopts a three-way structure, and the corresponding parts of the two passages of the perfusion main pipe are assembled with the central hole of the hub;
The air inlet end of the middle air passage device (4) penetrates through the flower hole on the hub.
8. A divided downhole fixed point injector according to claim 1, wherein the gas filling means (6) comprises a gas filling gun (6-1), a gas source means (6-2) connected to the inlet end of the gas filling gun, and an output pipe (6-3) connected to the outlet end of the gas filling gun; the output pipe (6-3) is connected with the air inlet end of the middle air path device (4).
9. A divided downhole fixed point injector according to claim 1, wherein the intermediate gas circuit means (4) comprises a three-way connection (4-1) and a gas pipe (4-2) connected to each of the passages.
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 |
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| Application Number | Priority Date | Filing Date | Title |
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| 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 |
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| Publication Number | Publication Date |
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| CN109989726A CN109989726A (en) | 2019-07-09 |
| CN109989726B true CN109989726B (en) | 2024-06-11 |
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