CN110043212B - Auxiliary water-stop conduit mud outlet device - Google Patents
Auxiliary water-stop conduit mud outlet device Download PDFInfo
- Publication number
- CN110043212B CN110043212B CN201910380001.6A CN201910380001A CN110043212B CN 110043212 B CN110043212 B CN 110043212B CN 201910380001 A CN201910380001 A CN 201910380001A CN 110043212 B CN110043212 B CN 110043212B
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B23/00—Apparatus for displacing, setting, locking, releasing, or removing tools, packers or the like in the boreholes or wells
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B23/00—Apparatus for displacing, setting, locking, releasing, or removing tools, packers or the like in the boreholes or wells
- E21B23/04—Apparatus for displacing, setting, locking, releasing, or removing tools, packers or the like in the boreholes or wells operated by fluid means, e.g. actuated by explosion
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B31/00—Fishing for or freeing objects in boreholes or wells
- E21B31/03—Freeing by flushing
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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)
- Marine Sciences & Fisheries (AREA)
- Drilling And Exploitation, And Mining Machines And Methods (AREA)
- Earth Drilling (AREA)
Abstract
The application provides an auxiliary riser pipe mud discharging device, which comprises: the hollow body is sleeved on the outer wall of the riser pipe and can move downwards along the outer wall of the riser pipe; jet manifold, jet pipe is assembled on the body; the jet manifold is provided with a first nozzle which is opened downwards, and when the body moves downwards along the outer wall of the riser, high-pressure fluid in the jet manifold can flow out towards the bottom of the riser through the first nozzle and impact clay around the bottom of the riser; the body comprises a first part and a second part which are arched, the first part and the second part can be spliced along the circumferential direction so as to be sleeved on the outer wall of the riser, one side of the first part and one side of the second part along the circumferential direction can be rotationally connected, and the other side of the first part and the second part along the circumferential direction is in buckling connection. The embodiment of the application provides an auxiliary riser mud discharging device which can reduce the lifting difficulty of a riser and improve the operation efficiency.
Description
Technical Field
The application relates to the technical field of ocean engineering, in particular to an auxiliary water-stop catheter mud discharging device.
Background
The auxiliary riser mud discharging device can be used for assisting the workover rig to lift and recover the riser. With the passage of offshore field development and production time, some fields have no economic value. In addition, the marine riser has a great potential safety hazard when the marine riser is idle for a long time, and corrosion of seawater to the marine riser structure can continuously increase the metal ion content in the water, thereby causing ecological environment deterioration. Therefore, each oil and gas company needs to discard the abandoned wellhead, cut the riser at the position 4m below the mud line, and lift and recycle the riser.
The mud discharging device of the riser in the prior art is mainly carried out by a workover rig on a production platform. However, because the power of the workover rig on the production platform is lower, the acting force for lifting the riser on the workover rig is smaller, and the lifting operation of the riser is difficult. Further, as the bottom of the riser is positioned in clay on the sea floor and the friction force of the clay on the sea floor to the side direction of the riser is large, the lifting difficulty of the riser is increased.
Disclosure of Invention
In view of this, the embodiment of the application provides an auxiliary riser mud discharging device, which can reduce the lifting difficulty of a riser and improve the operation efficiency.
In order to achieve the above purpose, the present application provides the following technical solutions: an auxiliary riser mud discharging device, comprising: the hollow body is used for being sleeved on the outer wall of the riser pipe and can move downwards along the outer wall of the riser pipe; the jet pipe is arranged on the body in a converging way; the jet manifold is provided with a first nozzle which is opened downwards, and when the body moves downwards along the outer wall of the riser, high-pressure fluid in the jet manifold can flow out towards the bottom of the riser through the first nozzle and impact clay around the bottom of the riser.
As a preferred embodiment, the body comprises a first part and a second part which are arched, the first part and the second part can be spliced along the circumferential direction so as to be sleeved on the outer wall of the riser, one side of the first part and the second part along the circumferential direction can be rotatably connected, and the other side of the first part and the second part along the circumferential direction is in buckling connection.
As a preferred embodiment, a pulley capable of contacting with the outer wall of the riser pipe is provided on the inner wall of the body.
As a preferred embodiment, the plurality of pulleys are arranged in the circumferential direction of the body.
As a preferred embodiment, the jet manifold comprises a vertical pipe and a transverse pipe, wherein the vertical pipe and the transverse pipe are arranged in the side wall of the body, the vertical pipe extends along the extending direction of the body, the transverse pipe extends along the circumferential direction of the body, the transverse pipe is communicated with the vertical pipe, an input end for injecting high-pressure fluid into the jet manifold is arranged on the transverse pipe, and the first nozzle is arranged on the vertical pipe.
As a preferred embodiment, the transverse tube has opposite first and second ends along its extension direction, the riser comprises a first riser arranged at the first end of the transverse tube and a second riser arranged at the second end of the transverse tube, the input end being located between the first riser and the second riser.
As a preferred embodiment, the jet manifold is provided with a second nozzle which is open upwards.
As a preferred embodiment, the jet manifold comprises a vertical pipe arranged in the side wall of the body, the second nozzle is positioned at the upper end of the vertical pipe, the first nozzle is positioned at the lower end of the vertical pipe, a third nozzle positioned between the first nozzle and the second nozzle is further arranged on the vertical pipe, and the third nozzle is opened downwards.
As a preferred embodiment, the jet manifold includes a riser provided in a side wall of the body, and the two second nozzles extend obliquely upward from the riser toward the inside and outside of the body, respectively.
As a preferred embodiment, the body is provided with a hanging ring for the external rope to pass through.
By means of the technical scheme, the auxiliary riser mud discharging device is characterized in that the body is arranged, and the jet manifold is arranged on the body, so that clay around the bottom of the riser can be dispersed, and further friction force of clay around the bottom of the riser to the side direction of the riser is reduced. Therefore, the difficulty in lifting the riser on the workover rig is reduced, and the operation efficiency is improved. Therefore, the embodiment of the application provides an auxiliary riser mud discharging device which can reduce the lifting difficulty of a riser and improve the operation efficiency.
Drawings
The drawings described herein are for illustration purposes only and are not intended to limit the scope of the present disclosure in any way. In addition, the shapes, proportional sizes, and the like of the respective components in the drawings are merely illustrative for aiding in understanding the present application, and are not particularly limited. Those skilled in the art with access to the teachings of the present application can select a variety of possible shapes and scale sizes to practice the present application as the case may be. In the drawings:
FIG. 1 is a schematic diagram of an auxiliary riser mud discharging device according to an embodiment of the present application;
FIG. 2 is a front view of an auxiliary riser mud discharging device according to an embodiment of the present application;
FIG. 3 is a cross-sectional view taken along the line A-A in FIG. 2;
FIG. 4 is a schematic development view of an auxiliary riser mud discharging device according to an embodiment of the present application;
fig. 5 is a cross-sectional view taken along the direction B-B in fig. 4.
Reference numerals illustrate:
11. a body; 13. a first nozzle; 15. a second nozzle; 17. a third nozzle; 19. jet manifold; 21. a first portion; 23. a second portion; 25. a pulley; 29. a transverse tube; 31. an input end; 33. a first riser; 35. a second riser; 37. a hanging ring; 39. a stop plate; 41. a clasp; 43. a hinge; 45. a riser.
Detailed Description
The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the application. All other embodiments, based on the embodiments of the application, which are apparent to those of ordinary skill in the art without inventive faculty, are intended to be within the scope of the application.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.
Referring to fig. 1 to 5, an auxiliary water-stop pipe mud discharging device provided in this embodiment includes: the hollow body 11 is used for being sleeved on the outer wall of the riser pipe, and the body 11 can move downwards along the outer wall of the riser pipe; a jet manifold 19, the jet manifold 19 being disposed on the body 11; the jet manifold 19 is provided with a first nozzle 13, the first nozzle 13 is opened downwards, and when the body 11 moves downwards along the outer wall of the riser, high-pressure fluid in the jet manifold 19 can flow out towards the bottom of the riser through the first nozzle 13 and impact clay around the bottom of the riser.
When the waterproof pipe is used, the body 11 is sleeved on the outer wall of the waterproof pipe, so that the body 11 moves downwards along the outer wall of the waterproof pipe under the action of gravity. The high pressure fluid is then fed into the jet manifold 19 through the inlet 31 so that as the body 11 moves down the outer wall of the riser, the high pressure fluid in the jet manifold 19 can flow out through the first nozzle 13 towards the bottom of the riser and impact the clay around the bottom of the riser. Thereby scattering the clay around the bottom of the riser, and reducing the friction force of the clay around the bottom of the riser to the side direction of the riser. Thereby reducing the difficulty of lifting the riser on the workover rig and improving the operation efficiency.
According to the scheme, the auxiliary riser mud discharging device provided by the embodiment of the application has the advantages that the main body 11 is arranged, and the jet manifold 19 is arranged on the main body 11, so that clay around the bottom of the riser can be dispersed, and further the lateral friction force of clay around the bottom of the riser on the riser is reduced. Therefore, the difficulty in lifting the riser on the workover rig is reduced, and the operation efficiency is improved.
As shown in fig. 2, in the present embodiment, the body 11 has a columnar shape as a whole. And the columnar body 11 has a hollow structure. The hollow portion forms a through passage penetrating the body 11. So that the body 11 can be sleeved on the outer wall of the riser through the through passage. Further, when the body 11 is sleeved on the outer wall of the riser, the body 11 can move downwards along the outer wall of the riser under the action of gravity; and gradually enters clay on the sea floor.
In one embodiment, the body 11 includes a first portion 21 and a second portion 23 that are arcuate in shape. Specifically, the first portion 21 and the second portion 23 are disposed opposite to each other in the extending direction of the body 11. As shown in fig. 1, for example, the body 11 extends in the up-down direction. The first portion 21 and the second portion 23 are disposed opposite to each other in the up-down direction. Further, the first portion 21 has a semicircular cross section in the extending direction of the body 11. The second portion 23 has a semicircular cross section in the extending direction of the body 11. Of course, the cross section of the first portion 21 in the extending direction of the body 11 and the cross section of the second portion 23 in the extending direction of the body 11 are not limited to be semicircular, but may be a circle in which the cross section of the first portion 21 in the extending direction of the body 11 is one-fourth. The cross section of the second portion 23 in the direction of extension of the body 11 is three-quarters of a circle. The application is not limited in this regard.
Further, the first portion 21 and the second portion 23 can be spliced circumferentially to fit over the outer wall of the riser. In particular, as shown in fig. 1, the radius of the arched first portion 21 is equal to the radius of the arched second portion 23. So that the first and second parts 21 and 23 can form a cylinder having a through passage therethrough when the first and second parts 21 and 23 are spliced in the circumferential direction. And the cross section of the through passage is circular.
Further, the first portion 21 and the second portion 23 are rotatably connected at one side in the circumferential direction. The rotatable connection may be, for example, as shown in fig. 4, by a hinge 43 connecting the first portion 21 and the second portion 23. Of course, the rotatable connection is not limited to the connection by the hinge 43, but may be another connection, such as a pin connection, and the present application is not limited thereto. The first portion 21 and the second portion 23 are snap-connected along the other side in the circumferential direction. Specifically, a stopper 39 is provided on the outer wall of the other side of the first portion 21. A snap ring 41 is provided on the outer wall of the other side of the second portion 23. The stop plate 39 can extend into the snap ring 41 to connect the other side of the first portion 21 to the other side of the second portion 23. And then the first part 21 and the second part 23 are connected in a buckling way, so that when the waterproof pipe penetrates through the body 11, the inner wall of the body 11 can be contacted with the outer wall of the waterproof pipe. Thereby preventing the body 11 from shaking in a radial direction while moving down the outer wall of the riser.
Further, a pulley 25 capable of contacting with the outer wall of the riser pipe is provided on the inner wall of the body 11. So that the pulley 25 contacts with the outer wall of the riser pipe through the pulley 25, so that the pulley 25 can roll on the outer wall of the riser pipe when the body 11 moves downward. So that the friction between the pulley 25 and the riser pipe is rolling friction, and the friction between the pulley 25 and the riser pipe is smaller than the sliding friction, so that the body 11 can slide downwards.
Further, the number of pulleys 25 is plural, and the plurality of pulleys 25 are arranged in the circumferential direction of the body 11. Specifically, the number of pulleys 25 is 4. Two of the pulleys 25 are arranged on the inner wall of the first portion 21. Two pulleys 25 are provided on the inner wall of the second portion 23. So that the inner wall of the body 11 can contact with the outer wall of the riser through 4 pulleys 25 along the circumferential direction, thereby ensuring rolling friction between the inner wall of the body 11 and the outer wall of the riser. Of course, the number of the pulleys 25 is not limited to 4, but may be other number, for example, 5, 6, 7, etc., and the present application is not limited thereto.
In the present embodiment, the jet manifold 19 is provided on the body 11. In particular, the jet manifold 19 may be provided on an inner wall of the body 11. The jet manifold 19 may also be provided on the outer wall of the body 11. Of course the jet manifold 19 may also be provided in the side wall of the body 11. Preferably, to reduce the volume of the body 11, a jet manifold 19 is provided in the side wall of the body 11. Further, the jet manifold 19 is provided with an input 31 for injecting high pressure fluid into the jet manifold 19. So that the jet manifold 19 has high pressure fluid therein by injecting high pressure fluid into the jet manifold 19. Specifically, the input port 31 includes an opening provided in the jet manifold 19 and a connection pipe communicating with the opening.
In the present embodiment, the jet manifold 19 is provided with the first nozzle 13. The first nozzle 13 opens downward. So that the high-pressure fluid in the jet manifold 19 can flow downwards through the first nozzle 13. Further, as the body 11 moves down the outer wall of the riser, the high pressure fluid within the jet manifold 19 can flow out through the first nozzle 13 toward the bottom of the riser and impact the clay around the bottom of the riser. Specifically, the riser pipe extends in the up-down direction. And the riser has opposite top and bottom portions along its extension. The bottom of the riser is located in clay on the sea floor. When the high-pressure fluid flows out towards the bottom of the riser through the first nozzle 13 and impacts clay around the bottom of the riser, the clay around the bottom of the riser can be dispersed, and the lateral friction force of the clay around the bottom of the riser on the riser is further reduced. Therefore, the difficulty in lifting the riser on the workover rig is reduced, and the operation efficiency is improved. Specifically, the first nozzle 13 communicates with the interior of the jet manifold 19. So that the high-pressure fluid in the jet manifold 19 can flow out through the first nozzle 13.
In one embodiment, jet manifold 19 includes a riser 45 and a cross tube 29 disposed within a sidewall of body 11. The stand pipe 45 extends in the extending direction of the body 11, and the lateral pipe 29 extends in the circumferential direction of the body 11. Specifically, as shown in fig. 5, the body 11 extends in the up-down direction, and the stand pipe 45 extends in the up-down direction. The cross tube 29 extends circumferentially in a horizontal plane. The cross tube 29 communicates with a riser 45. The cross pipe 29 is provided with an input 31 for high-pressure fluid to be injected into the jet manifold 19. The first nozzle 13 is arranged on the riser 45. So that high pressure fluid can be injected into the cross tube 29 through the input port 31 so that the high pressure fluid can flow through the cross tube 29 into the riser 45 and out the first nozzle 13 on the riser 45.
Further, the jet manifold 19 is two. The two jet manifolds 19 are located in the first portion 21 and the second portion 23, respectively. So that the clay around the bottom of the riser can be impacted by the two jet manifolds 19 along the circumference of the riser, thus reducing the time for dispersing the clay and improving the effect of dispersing the clay.
Further, the cross tube 29 has opposite first and second ends along its extension. For example, as shown in fig. 3, the first end of the cross tube 29 is the left end. The second end of the cross tube 29 is the right end. Riser 45 includes a first riser 33 disposed at a first end of cross tube 29 and a second riser 35 disposed at a second end of cross tube 29. I.e. the first riser 33 is located at the left end of the cross tube 29. The second riser 35 is located at the right end of the cross tube 29. The input 31 is located between a first riser 33 and a second riser 35. So that when high-pressure fluid is introduced into the lateral pipe 29 through the input port 31, the high-pressure fluid in the lateral pipe 29 can flow toward the left-end first riser 33, and thus flow downward from the first nozzle 13 of the first riser 33. And the high-pressure fluid in the lateral pipe 29 can also flow toward the right-end second riser 35 so as to flow downward from the first nozzle 13 of the second riser 35. So that the clay around the bottom of the riser pipe can be impacted by the first riser pipe 33 and the second riser pipe 35, respectively, thus reducing the time for dispersing the clay and improving the effect of dispersing the clay.
In one embodiment, the jet manifold 19 is provided with a second nozzle 15 which is open upwards. So that the high-pressure fluid in the jet manifold 19 can flow upward out through the second nozzle 15. Since the high pressure fluid in the jet manifold 19 flows upward through the second nozzle 15, the fluid in the second nozzle 15 will exert a downward impact force on the body 11, so that the body 11 can move downward not only under the action of gravity, but also under the action of the fluid in the second nozzle 15, thereby increasing the depth of the body 11 into the seafloor clay.
Further, the second nozzle 15 is located at the upper end of the riser 45. Specifically, there are two second nozzles 15, and the two second nozzles 15 extend obliquely upward from the stand pipe 45 toward the inside and outside of the body 11, respectively. Further, the aperture of each second nozzle 15 becomes gradually smaller in the outward direction from the standpipe 45. This increases the velocity of the high pressure fluid exiting each of the second nozzles 15. Thereby increasing the force exerted by the high pressure fluid within each second nozzle 15 on the body 11.
Further, the first nozzle 13 is located at the lower end of the riser 45. Specifically, the first nozzles 13 are three, and two of the first nozzles 13 extend obliquely downward from the stand pipe 45 toward the inside and outside of the body 11, respectively. A first nozzle 13 extends vertically downwards. And the vertically downwardly extending first nozzles 13 are located between two obliquely downwardly extending first nozzles 13. Thus, the clay inside and outside the body 11 can be impacted by the two first nozzles 13 extending obliquely downwards, so that the speed of dispersing the clay is improved. And the clay is impacted by the first nozzle 13 extending vertically downward to increase the speed of dispersing the clay. Further, the aperture of each first nozzle 13 becomes gradually smaller in the outward direction from the standpipe 45. This increases the velocity of the high pressure fluid exiting each first nozzle 13. Thereby increasing the impact force of the high-pressure fluid in each first nozzle 13 on the clay.
Further, a third nozzle 17 is provided on the riser 45 between the first nozzle 13 and the second nozzle 15. For example, as shown in fig. 5, the third nozzle 17 is an intermediate portion with the standpipe 45. The third nozzle 17 opens downward. So that the high pressure fluid in the riser 45 can flow downwards through the third fluid and impact the clay at the bottom of the sea. So that the speed of dispersing the clay can be increased by the third nozzle 17. Specifically, the number of the third nozzles 17 is two, and the two third nozzles 17 extend obliquely downward from the stand pipe 45 toward the inside and outside of the body 11, respectively. Further, the aperture of each third nozzle 17 becomes gradually smaller in the outward direction from the standpipe 45. This increases the velocity of the high pressure fluid exiting each third nozzle 17. Thereby increasing the impact force of the high-pressure fluid in each third nozzle 17 on the clay.
Further, a hanging ring 37 for the external rope to pass through is provided on the body 11. Therefore, the external rope can be arranged in the hanging ring 37 in a penetrating way, so that when the body 11 moves downwards along the outer wall of the riser, the speed of the downward movement of the body 11 can be controlled through the external rope, and the body 11 can move stably along the outer wall of the riser.
It should be noted that, in the description of the present application, the terms "first," "second," and the like are used for descriptive purposes only and to distinguish between similar objects, and there is no order of preference between them, nor should they be construed as indicating or implying relative importance. Furthermore, in the description of the present application, unless otherwise indicated, the meaning of "a plurality" is two or more.
It is to be understood that the above description is intended to be illustrative, and not restrictive. Many embodiments and many applications other than the examples provided will be apparent to those of skill in the art upon reading the above description. The scope of the present teachings should, therefore, be determined not with reference to the above description, but instead should be determined with reference to the appended claims, along with the full scope of equivalents to which such claims are entitled. The disclosures of all articles and references, including patent applications and publications, are incorporated herein by reference for the purpose of completeness. The omission of any aspect of the subject matter disclosed herein in the preceding claims is not intended to forego such subject matter, nor should the applicant be deemed to have such subject matter not considered to be part of the subject matter of the disclosed application.
Claims (7)
1. An auxiliary riser mud discharging device, comprising:
the hollow body is used for being sleeved on the outer wall of the riser pipe and can move downwards along the outer wall of the riser pipe;
the jet pipe is arranged on the body in a converging way; the jet manifold is provided with a first nozzle which is opened downwards, and when the body moves downwards along the outer wall of the riser, high-pressure fluid in the jet manifold can flow out towards the bottom of the riser through the first nozzle and impact clay around the bottom of the riser;
the body comprises a first part and a second part which are arched, the first part and the second part can be spliced along the circumferential direction so as to be sleeved on the outer wall of the riser, one side of the first part and the second part along the circumferential direction can be rotationally connected, and the other side of the first part and the second part along the circumferential direction is in buckling connection;
the inner wall of the body is provided with a pulley which can be contacted with the outer wall of the water-stop conduit;
the jet manifold comprises a vertical pipe and a transverse pipe, wherein the vertical pipe and the transverse pipe are arranged in the side wall of the body, the vertical pipe extends along the extending direction of the body, the transverse pipe extends along the circumferential direction of the body, the transverse pipe is communicated with the vertical pipe, an input end for injecting high-pressure fluid into the jet manifold is arranged on the transverse pipe, and the first nozzle is arranged on the vertical pipe.
2. The auxiliary riser mud discharging device according to claim 1, wherein: the pulley is a plurality of, and a plurality of pulleys are arranged along the circumference of body.
3. The auxiliary riser mud discharging device according to claim 1, wherein: the horizontal pipe has opposite first and second ends along its extending direction, the riser including set up in the first riser of horizontal pipe's first end with set up in the second riser of horizontal pipe's second end, the input is located between first riser and the second riser.
4. The auxiliary riser mud discharging device according to claim 1, wherein: the jet manifold is provided with a second nozzle which is opened upwards.
5. The auxiliary riser mud discharging device according to claim 4, wherein: the second nozzle is located at the upper end of the vertical pipe, the first nozzle is located at the lower end of the vertical pipe, a third nozzle located between the first nozzle and the second nozzle is further arranged on the vertical pipe, and the third nozzle is opened downwards.
6. The auxiliary riser mud discharging device according to claim 4, wherein: the number of the second nozzles is two, and the two second nozzles extend upwards obliquely from the vertical pipe towards the inner side and the outer side of the body respectively.
7. The auxiliary riser mud discharging device according to claim 1, wherein: the body is provided with a hanging ring for the external rope to pass through.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910380001.6A CN110043212B (en) | 2019-05-08 | 2019-05-08 | Auxiliary water-stop conduit mud outlet device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910380001.6A CN110043212B (en) | 2019-05-08 | 2019-05-08 | Auxiliary water-stop conduit mud outlet device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110043212A CN110043212A (en) | 2019-07-23 |
| CN110043212B true CN110043212B (en) | 2023-10-24 |
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| CN201910380001.6A Active CN110043212B (en) | 2019-05-08 | 2019-05-08 | Auxiliary water-stop conduit mud outlet device |
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|---|---|
| CN110043212A (en) | 2019-07-23 |
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