CN111927381B - Hydraulic expansion type packer for plugging oil well - Google Patents
Hydraulic expansion type packer for plugging oil well Download PDFInfo
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- CN111927381B CN111927381B CN202010828406.4A CN202010828406A CN111927381B CN 111927381 B CN111927381 B CN 111927381B CN 202010828406 A CN202010828406 A CN 202010828406A CN 111927381 B CN111927381 B CN 111927381B
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- 239000003129 oil well Substances 0.000 title claims abstract description 25
- 230000001681 protective effect Effects 0.000 claims description 8
- 230000000694 effects Effects 0.000 claims description 2
- 238000012856 packing Methods 0.000 description 9
- 238000000034 method Methods 0.000 description 6
- 235000017166 Bambusa arundinacea Nutrition 0.000 description 4
- 235000017491 Bambusa tulda Nutrition 0.000 description 4
- 241001330002 Bambuseae Species 0.000 description 4
- 235000015334 Phyllostachys viridis Nutrition 0.000 description 4
- 239000011425 bamboo Substances 0.000 description 4
- 238000007789 sealing Methods 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 238000001125 extrusion Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 241000251468 Actinopterygii Species 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
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
- E21B33/12—Packers; Plugs
- E21B33/126—Packers; Plugs with fluid-pressure-operated elastic cup or skirt
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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)
- Pipe Accessories (AREA)
Abstract
The invention relates to the technical field of oil well plugging equipment, and discloses a hydraulic expansion type packer for oil well plugging, which comprises a packer body, wherein an upper pressing cylinder is movably sleeved at the upper part of the packer body, a rubber cylinder is fixedly sleeved at the lower part of the packer body, and connecting pipes are fixedly sleeved at the top and the bottom of the packer body. This be used for hydraulic pressure inflation formula packer for oil well shutoff, connect through utilizing cardboard and spring one between connecting pipe and the urceolus, be convenient for with cardboard card in the inner chamber of draw-in groove one, one side through the connecting axle is equipped with plectane and spring leaf, be convenient for with the spring leaf card in the inner chamber of draw-in groove two, simultaneously also be convenient for when connecting pipe and pipe connection, insert the connecting pipe in the inner chamber of urceolus and make the cardboard be located the inner chamber of draw-in groove one, enter into the inner chamber of draw-in groove two with the spring leaf through rotatory connecting pipe, make connecting pipe and pipeline zonulae occludens, be convenient for the quick and pipe connection of connecting pipe.
Description
Technical Field
The invention relates to the technical field of oil well plugging equipment, in particular to a hydraulic expansion type packer for plugging an oil well.
Background
In the development process of oil and gas fields, a packer is the most common tool for realizing setting and unsetting, and generally, the packer can be divided into the following types according to the structure: self-sealing, compression, wedging, expansion, combination, and the like; according to the setting principle, the method comprises the following steps: the packer is mainly an underground tool which utilizes an elastic sealing element to seal an annular space between a pipe column and a shaft, and can absorb expansion media such as water or oil in the shaft to generate volume expansion to achieve the purpose of sealing the annular space when encountering liquid expansion, so that the packer is widely applied to the fields of oil-water well layered sectional exploitation, water control and water shutoff, reservoir reconstruction and the like.
When the existing hydraulic expansion type packer for oil well plugging is connected with an external pipeline, most of the existing hydraulic expansion type packer for oil well plugging is connected in a thread meshing mode, a connecting pipe on the hydraulic expansion type packer for oil well plugging needs to be rotated for multiple circles by a worker to be connected with the external pipeline in a sealing mode, the speed of connecting the connecting pipe on the hydraulic expansion type packer for oil well plugging and the external pipeline is reduced, and the packer is inconvenient to use.
Disclosure of Invention
The invention provides a hydraulic expansion type packer for plugging an oil well, which has the advantages of being convenient for connecting a connecting pipe with an external pipeline and being convenient for dismounting the connecting pipe from the external pipeline, and solves the problems in the background technology.
The invention provides the following technical scheme: a hydraulic expansion type packer for plugging an oil well comprises a packer body, wherein an upper pressing barrel is movably sleeved on the upper portion of the packer body, a rubber barrel is fixedly sleeved on the lower portion of the packer body, connecting pipes are fixedly sleeved on the top and the bottom of the packer body, an outer barrel is movably sleeved on the outer side of each connecting pipe, a pipeline is fixedly sleeved on the bottom of each outer barrel, a first clamping groove is formed in the outer side of each outer barrel, a moving box located between the corresponding connecting pipe and the corresponding outer barrel is fixedly installed on the outer side of each connecting pipe, a moving block is movably sleeved in an inner cavity of each moving box, a moving groove is formed in the outer side of each moving block, a clamping plate is movably sleeved in an inner cavity of each connecting groove through a shaft, a connecting shaft is movably sleeved on the upper side of each clamping plate, a first spring is fixedly installed on the inner side of the inner cavity of each moving box, one end of the first spring is fixedly provided with a clamping plate located in an inner cavity of the first clamping groove, one side of the inner cavity of the first clamping groove is provided with a second clamping groove, one end of the connecting shaft is fixedly provided with a circular plate, and one side of the circular plate is fixedly provided with a spring piece located in an inner cavity of the second clamping groove.
Preferably, an inner groove is formed in the inner cavity of the rubber barrel, an annular plate is fixedly mounted at the bottom of the inner cavity of the inner groove, a second spring is fixedly mounted at the top of the annular plate, the number of the annular plates is two, the two annular plates are respectively distributed at the bottom and the top of the inner cavity of the inner groove, and the two annular plates are fixedly connected through the second spring.
Preferably, the bottom of the connecting pipe is fixedly provided with a rubber ring, and the bottom of the rubber ring is in close contact with the top of the pipeline.
Preferably, the bottom of the upper pressure cylinder is provided with a protective groove, the top of the protective groove is fixedly provided with a supporting plate, the lower part of the supporting plate is fixedly sleeved with an auxiliary shaft, and the outer side of the auxiliary shaft is movably sleeved with a baffle.
Preferably, the bottom of the baffle is in contact with the top of the rubber cylinder, and the bottom of the baffle is an inclined plane.
Preferably, two connecting grooves and two clamping plates are respectively arranged in the inner cavity of the movable box, and one sides of the two clamping plates, which are close to the center of the movable box, are movably sleeved on the outer sides of the connecting shafts.
Preferably, the width of the moving groove is two centimeters smaller than that of the moving block, and two sides of the moving block are both in contact with two sides of the inner cavity of the moving box.
Preferably, the section of the second clamping groove and the whole spring piece are both in an arrow shape, and one end of the spring piece is fixedly installed on one side of the circular plate.
The invention has the following beneficial effects:
1. this be used for hydraulic pressure inflation formula packer for oil well shutoff, connect through utilizing cardboard and spring one between connecting pipe and the urceolus, be convenient for with cardboard card in the inner chamber of draw-in groove one, one side through the connecting axle is equipped with plectane and spring leaf, be convenient for with the spring leaf card in the inner chamber of draw-in groove two, simultaneously also be convenient for when connecting pipe and pipe connection, insert the connecting pipe in the inner chamber of urceolus and make the cardboard be located the inner chamber of draw-in groove one, enter into the inner chamber of draw-in groove two with the spring leaf through rotatory connecting pipe, make connecting pipe and pipeline zonulae occludens, be convenient for the quick and pipe connection of connecting pipe.
2. This be used for oil well shutoff to use hydraulic pressure inflation formula packer is equipped with annular plate and spring two in the inner chamber through the inside groove, utilizes two fixed connection of spring between two annular plates of rethread, when being convenient for go up the pressure section of thick bamboo and extrude the packing element, can slow down the extrusion force of going up the pressure section of thick bamboo to the packing element, has avoided the too fast packing element that leads to of the speed of going up the pressure section of thick bamboo broken, has improved the life of packing element.
3. This be used for hydraulic pressure inflation formula packer for oil well shutoff is equipped with the baffle through the inner chamber of protecting groove, when being convenient for press a section of thick bamboo to move down and extrude the packing element, can make the baffle upwards rotatory for the baffle keeps off at the top of packing element, has avoided intraductal debris to drop the fish tail packing element on the top of packing element, has played the effect to the packing element protection.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic perspective view of a card slot of the present invention;
FIG. 3 is a schematic perspective view of the mobile box of the present invention;
FIG. 4 is a schematic perspective view of a spring according to the present invention;
FIG. 5 is a schematic cross-sectional perspective view of a second card slot of the present invention;
FIG. 6 is a schematic cross-sectional perspective view of the rubber cartridge of the present invention;
fig. 7 is a perspective view of the auxiliary shaft of the present invention.
In the figure: 1. a packer body; 2. pressing the cylinder upwards; 3. a rubber cylinder; 4. a connecting pipe; 5. an outer cylinder; 6. a pipeline; 7. a first clamping groove; 8. a mobile box; 9. a moving block; 10. a moving groove; 11. clamping a plate; 12. a connecting shaft; 13. a first spring; 14. a second clamping groove; 15. a circular plate; 16. a spring plate; 17. an inner tank; 18. an annular plate; 19. a second spring; 20. a protective bath; 21. a support plate; 22. an auxiliary shaft; 23. a baffle plate; 24. connecting grooves; 25. a rubber ring.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-7, a hydraulic expansion packer for plugging an oil well comprises a packer body 1, wherein an upper pressing barrel 2 is movably sleeved on the upper portion of the packer body 1, a protective groove 20 is formed in the bottom of the upper pressing barrel 2, a supporting plate 21 is fixedly installed at the top of the protective groove 20, an auxiliary shaft 22 is fixedly sleeved on the lower portion of the supporting plate 21, a baffle 23 is movably sleeved on the outer side of the auxiliary shaft 22, the baffle 23 is arranged in an inner cavity of the protective groove 20, so that when the upper pressing barrel 2 moves downwards to extrude a rubber barrel 3, the baffle 23 can rotate upwards to be blocked at the top of the rubber barrel 3, the rubber barrel 3 is prevented from being scratched by sundries falling onto the top of the rubber barrel 3 in a pipe, the rubber barrel 3 is protected, the bottom of the baffle 23 is in contact with the top of the rubber barrel 3, the bottom of the baffle 23 is an inclined plane and is in contact with the top of the rubber barrel 3 through the bottom of the baffle 23, the baffle 23 is inclined at the bottom of the baffle 23, so that the baffle 23 can rotate upwards better when the upper pressing barrel 2 moves downwards, the rubber barrel 3 is fixedly sleeved at the lower part of the packer body 1, the inner cavity of the rubber barrel 3 is provided with the inner groove 17, the bottom of the inner cavity of the inner groove 17 is fixedly provided with the annular plate 18, the top of the annular plate 18 is fixedly provided with the spring II 19, the number of the annular plates 18 is two, the two annular plates 18 are respectively distributed at the bottom and the top of the inner cavity of the inner groove 17, the two annular plates 18 are fixedly connected through the spring II 19, the annular plate 18 and the spring II 19 are arranged in the inner cavity of the inner groove 17, and the two annular plates 18 are fixedly connected through the spring II 19, so that when the upper pressing barrel 2 extrudes the rubber barrel 3, the extrusion force of the upper pressing barrel 2 on the rubber barrel 3 can be reduced, the phenomenon that the rubber barrel 3 is crushed due to the high speed of the upper pressing barrel 2 is avoided, and the service life of the rubber barrel 3 is prolonged, the top and the bottom of the packer body 1 are fixedly sleeved with connecting pipes 4, the bottom of each connecting pipe 4 is fixedly provided with a rubber ring 25, the bottom of each rubber ring 25 is in close contact with the top of a pipeline 6, the rubber rings 25 are fixedly arranged at the bottom of each connecting pipe 4, and then the bottom of each rubber ring 25 is in close contact with the top of the pipeline 6, so that the connection between each connecting pipe 4 and the corresponding pipeline 6 is tighter, liquid is prevented from overflowing from the connecting pipes 4 and the corresponding pipelines 6, an outer barrel 5 is movably sleeved at the outer side of each connecting pipe 4, the pipeline 6 is fixedly sleeved at the bottom of the outer barrel 5, a first clamping groove 7 is formed in the outer side of the outer barrel 5, a movable box 8 positioned between the connecting pipes 4 and the outer barrel 5 is fixedly arranged at the outer side of each connecting pipe 4, two connecting grooves 24 and two clamping plates 11 are respectively arranged in an inner cavity of each movable box 8, one side, close to the center of each clamping plate 11, is movably sleeved on the outer side of the corresponding connecting shaft 12, the two clamping plates 11 are movably connected through the connecting shaft 12, so that the angle between the two clamping plates 11 can be changed under the condition of external force, meanwhile, the two clamping plates 11 can be conveniently stored in the moving box 8, the moving block 9 is movably sleeved in the inner cavity of the moving box 8, the moving groove 10 is formed in the outer side of the moving box 8, the width of the moving groove 10 is two centimeters smaller than that of the moving block 9, both sides of the moving block 9 are in contact with both sides of the inner cavity of the moving box 8, the moving block 9 can move in the moving box 8 and cannot fall off from the moving box 8 through the fact that the width of the moving groove 10 is two centimeters smaller than that of the moving block 9, the connecting groove 24 is formed in the outer side of the moving block 9, the clamping plates 11 are movably sleeved in the inner cavity of the connecting groove 24 through shafts, the connecting shaft 12 is movably sleeved on the upper sides of the clamping plates 11, and the first spring 13 is fixedly installed on the inner side of the inner cavity of the moving box 8, one end fixed mounting of spring one 13 has the cardboard 11 that is located the draw-in groove 7 inner chamber, draw-in groove two 14 has been seted up to one side of draw-in groove one 7 inner chamber, the section of draw-in groove two 14 and the whole of spring leaf 16 all are the arrow point shape, the one end fixed mounting of spring leaf 16 is on one side of plectane 15, the section through draw-in groove two 14 and the whole of spring leaf 16 all are the arrow point shape, make spring leaf 16 card can not drop easily in draw-in groove two 14, the one end fixed mounting of connecting axle 12 has plectane 15, one side fixed mounting of plectane 15 has the spring leaf 16 that is located the draw-in groove two 14 inner chambers.
The working principle is that when the connecting pipe 4 and the pipeline 6 need to be connected, the connecting pipe 4 is inserted into the inner cavity of the outer barrel 5, so that the clamping plates 11 are extruded, the angle between the two clamping plates 11 is increased, when the clamping plates 11 enter the inner cavity of the clamping groove I7, the clamping plates 11 are restored by using the elastic force of the spring I13, then the connecting pipe 4 is rotated to clamp the spring piece 16 into the inner cavity of the clamping groove II 14, at the moment, the rubber ring 25 on the connecting pipe 4 is in tight contact with the top of the pipeline 6, when the upper pressing barrel 2 moves downwards, the baffle plate 23 can be driven to move downwards, the rubber barrel 3 is arranged below the baffle plate 23, an upward force can be generated on the baffle plate 23, the baffle plate 23 rotates upwards to be blocked at the top of the rubber barrel 3, when the upper pressing barrel 2 continues to move downwards, the rubber barrel 3 can be extruded, so that the spring II 19 in the rubber barrel 3 is extruded, the downward impact force of the upper pressing barrel 2 can be relieved by the elastic force of the second spring 19.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (8)
1. The utility model provides a be used for oil well shutoff to use hydraulic pressure inflation formula packer, includes packer body (1), its characterized in that: an upper pressing barrel (2) is movably sleeved on the upper portion of the packer body (1), a rubber barrel (3) is fixedly sleeved on the lower portion of the packer body (1), connecting pipes (4) are fixedly sleeved on the top and the bottom of the packer body (1), an outer barrel (5) is movably sleeved on the outer side of each connecting pipe (4), a pipeline (6) is fixedly sleeved on the bottom of each outer barrel (5), a first clamping groove (7) is formed in the outer side of each outer barrel (5), a moving box (8) located between each connecting pipe (4) and each outer barrel (5) is fixedly installed on the outer side of each connecting pipe (4), a moving block (9) is movably sleeved on the inner cavity of each moving box (8), a moving groove (10) is formed in the outer side of each moving block (8), a connecting groove (24) is formed in the outer side of each moving block (9), and a clamping plate (11) is movably sleeved on the inner cavity of each connecting groove (24), connecting axle (12) has been cup jointed in the upside activity of cardboard (11), the inboard fixed mounting of removal case (8) inner chamber has spring (13), the one end fixed mounting of spring (13) has cardboard (11) that are located draw-in groove (7) inner chamber, draw-in groove two (14) have been seted up to one side of draw-in groove (7) inner chamber, the one end fixed mounting of connecting axle (12) has plectane (15), one side fixed mounting of plectane (15) has spring leaf (16) that are located draw-in groove two (14) inner chambers.
2. The hydraulic inflatable packer for plugging an oil well, according to claim 1, wherein: an inner groove (17) is formed in the inner cavity of the rubber barrel (3), annular plates (18) are fixedly mounted at the bottom and the top of the inner cavity of the inner groove (17) respectively, a second spring (19) is fixedly mounted at the top of each annular plate (18), the number of the annular plates (18) is two, and the two annular plates (18) are fixedly connected through the second spring (19).
3. The hydraulic inflatable packer for plugging an oil well, according to claim 1, wherein: the bottom fixed mounting of connecting pipe (4) has rubber circle (25), the top in close contact with of the bottom of rubber circle (25) and pipeline (6).
4. The hydraulic inflatable packer for plugging an oil well, according to claim 1, wherein: a protective groove (20) is formed in the bottom of the upper pressure barrel (2), a supporting plate (21) is fixedly mounted at the top of the protective groove (20), an auxiliary shaft (22) is fixedly sleeved on the lower portion of the supporting plate (21), and a baffle (23) is movably sleeved on the outer side of the auxiliary shaft (22).
5. The hydraulic inflatable packer for plugging an oil well according to claim 4, wherein: the bottom of the baffle plate (23) is in contact with the top of the rubber cylinder (3), and the bottom of the baffle plate (23) is an inclined plane.
6. The hydraulic inflatable packer for plugging an oil well, according to claim 1, wherein: two connecting grooves (24) and two clamping plates (11) are respectively arranged in the inner cavity of the movable box (8), and one side, close to the center of the movable box (8), of each clamping plate (11) is movably sleeved on the outer side of the connecting shaft (12).
7. The hydraulic inflatable packer for plugging an oil well, according to claim 1, wherein: the width of the moving groove (10) is two centimeters smaller than that of the moving block (9), and two sides of the moving block (9) are in contact with two sides of the inner cavity of the moving box (8).
8. The hydraulic inflatable packer for plugging an oil well, according to claim 1, wherein: the section of the second clamping groove (14) and the whole spring piece (16) are both in an arrow shape, and one end of the spring piece (16) is fixedly arranged on one side of the circular plate (15).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010828406.4A CN111927381B (en) | 2020-08-18 | 2020-08-18 | Hydraulic expansion type packer for plugging oil well |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010828406.4A CN111927381B (en) | 2020-08-18 | 2020-08-18 | Hydraulic expansion type packer for plugging oil well |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111927381A CN111927381A (en) | 2020-11-13 |
| CN111927381B true CN111927381B (en) | 2021-09-14 |
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| CN202010828406.4A Active CN111927381B (en) | 2020-08-18 | 2020-08-18 | Hydraulic expansion type packer for plugging oil well |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113374438A (en) * | 2021-06-25 | 2021-09-10 | 李涧 | Hydraulic expansion type packer for oil well plugging and using method thereof |
| CN113417597A (en) * | 2021-08-04 | 2021-09-21 | 陈佳欣 | Adjustable bridge plug with protection mechanism |
| CN113982524B (en) * | 2021-11-05 | 2022-08-09 | 招远金河石油设备技术开发有限公司 | Packer for preventing packer rubber sleeve from being damaged and using method thereof |
| CN118601510A (en) * | 2024-05-21 | 2024-09-06 | 临沂富沂石油有限公司 | Long-life petroleum packer |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104863540A (en) * | 2015-05-28 | 2015-08-26 | 荆州市赛瑞能源技术有限公司 | Anchor packer with hydraulic setting function and rotation unsetting function |
| CN208816082U (en) * | 2018-08-06 | 2019-05-03 | 大庆泓洋机械设备有限公司 | A kind of automatic packer in oil field |
| CN111395989A (en) * | 2020-04-30 | 2020-07-10 | 大庆昊运橡胶制品有限公司 | Core-pulling-free large-channel high-temperature high-pressure fracturing expansion type rubber cylinder packing tool |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11649691B2 (en) * | 2013-11-22 | 2023-05-16 | Target Completions, LLC | IPacker bridge plug with slips |
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2020
- 2020-08-18 CN CN202010828406.4A patent/CN111927381B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104863540A (en) * | 2015-05-28 | 2015-08-26 | 荆州市赛瑞能源技术有限公司 | Anchor packer with hydraulic setting function and rotation unsetting function |
| CN208816082U (en) * | 2018-08-06 | 2019-05-03 | 大庆泓洋机械设备有限公司 | A kind of automatic packer in oil field |
| CN111395989A (en) * | 2020-04-30 | 2020-07-10 | 大庆昊运橡胶制品有限公司 | Core-pulling-free large-channel high-temperature high-pressure fracturing expansion type rubber cylinder packing tool |
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| CN111927381A (en) | 2020-11-13 |
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Effective date of registration: 20210825 Address after: 131300 Linjiang Street 157, Daan City, Baicheng City, Jilin Province Applicant after: DAAN HONGYUAN PIPE Co.,Ltd. Address before: 163000-401, unit 2, building 1016, Donghu District 10, Ranghulu District, Daqing City, Heilongjiang Province Applicant before: Xiao Yundong |
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