CN111058781A - Sucker rod paraffin scraping centralizer - Google Patents
Sucker rod paraffin scraping centralizer Download PDFInfo
- Publication number
- CN111058781A CN111058781A CN201911365351.1A CN201911365351A CN111058781A CN 111058781 A CN111058781 A CN 111058781A CN 201911365351 A CN201911365351 A CN 201911365351A CN 111058781 A CN111058781 A CN 111058781A
- Authority
- CN
- China
- Prior art keywords
- centralizer
- fixedly connected
- sucker rod
- permanent magnet
- wall
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 239000012188 paraffin wax Substances 0.000 title claims abstract description 19
- 238000007790 scraping Methods 0.000 title claims abstract description 15
- 230000000694 effects Effects 0.000 claims description 5
- 238000002347 injection Methods 0.000 claims description 3
- 239000007924 injection Substances 0.000 claims description 3
- 230000001846 repelling effect Effects 0.000 claims description 3
- 238000007789 sealing Methods 0.000 claims description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 2
- 239000003921 oil Substances 0.000 abstract description 41
- 239000010779 crude oil Substances 0.000 abstract description 35
- 239000001993 wax Substances 0.000 abstract description 17
- 230000008021 deposition Effects 0.000 abstract description 5
- 239000003208 petroleum Substances 0.000 abstract description 2
- 238000000034 method Methods 0.000 description 13
- 230000008569 process Effects 0.000 description 11
- 238000005086 pumping Methods 0.000 description 9
- 239000003129 oil well Substances 0.000 description 7
- 230000009471 action Effects 0.000 description 6
- 238000001556 precipitation Methods 0.000 description 4
- 230000007547 defect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000005415 magnetization Effects 0.000 description 2
- 238000004018 waxing Methods 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000005728 strengthening Methods 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
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/10—Wear protectors; Centralising devices, e.g. stabilisers
- E21B17/1071—Wear protectors; Centralising devices, e.g. stabilisers specially adapted for pump rods, e.g. sucker rods
-
- 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
- E21B37/00—Methods or apparatus for cleaning boreholes or wells
-
- 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
- E21B37/00—Methods or apparatus for cleaning boreholes or wells
- E21B37/02—Scrapers specially adapted therefor
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (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)
- Mechanical Engineering (AREA)
- Earth Drilling (AREA)
Abstract
The invention relates to the technical field of petroleum equipment and discloses a sucker rod paraffin scraping centralizer which comprises a centralizer main body, wherein the upper part of the centralizer is fixedly connected with a threaded connector, the middle part of the bottom end of the centralizer is fixedly connected with a threaded connecting sleeve, the side surface of the centralizer main body is fixedly connected with a plurality of groups of sleeves, one side of the inner wall of each sleeve is fixedly connected with a spring, and the other end of each spring is fixedly connected with a limiting block. Be provided with tubaeform opening through the bottom with the circulation chamber, and the upper portion in circulation chamber is connected with the inside cavity of seting up the jet orifice of connector, when centralizer descends, crude oil upwards flows through the circulation chamber, spout by the jet orifice in the inside cavity of connector, because the jet orifice is provided with a plurality of groups, and semicircular in shape distributes, make crude oil wash away sucker rod outer wall and oil pipe inner wall, the wax adhesion that prevents to appear is on oil pipe inner wall and sucker rod outer wall, the problem of oil pipe inner wall wax deposition has been solved when centralizing the sucker rod.
Description
Technical Field
The invention relates to the technical field of petroleum equipment, in particular to a paraffin scraping centralizer of a sucker rod.
Background
The sucker rod is a slender rod piece of the pumping well, the upper part of the sucker rod is connected with a polished rod, the lower part of the sucker rod is connected with an oil well pump to play a role in transmitting power, and the working principle is as shown in figures 9-10: when the sucker rod rises, the oil well pump draws crude oil in an oil layer to enter the oil well pump, and when the sucker rod descends, the crude oil in the oil well pump enters an oil pipe from a perforation section, so that the crude oil in the oil pipe flows upwards in the descending process of the sucker rod, and a certain flow rate is achieved. The sucker rod centralizer is a tool for preventing the sucker rod from being abraded with the inner wall of an oil pipe in the process of moving up and down in the oil pipe, is mainly suitable for an oil pumping machine well and a directional inclined well with eccentric wear above a neutral point of the sucker rod, can be divided into a roller type, a columnar type and a hoop type according to the shape, has the characteristics of large flow area between the roller type sucker rod centralizer and the oil pipe, more centralizing points, long service life, less abrasion to the oil pipe and the like, is increasingly applied to the oil pumping process of the oil well, but the existing centralizer has some defects in the using process:
1. because the wax content of most of crude oil in China is higher, in the process of lifting the crude oil from a well bottom to the ground, along with the reduction of temperature and pressure, paraffin can be separated out from the crude oil and is attached to the inner wall of an oil pumping pipe, the aperture of the oil pipe is reduced, the outer diameter of the oil pumping pipe is increased, the oil flow resistance is increased, an oil well can be blocked seriously, and the pump blockage phenomenon occurs.
2. Although the existing ball type oil pumping pipe centralizer can centralize and reduce the friction force of an oil pumping pipe, in the actual use process, the wax deposition phenomenon exists on the inner wall of the oil pipe, when wax enters a ball gap, the ball can not roll when contacting with the inner wall of the oil pipe, and in the actual use process, the ball slides relative to the inner wall, so that the ball is extremely easy to wear, and the friction force is increased.
Disclosure of Invention
Aiming at the defects of the background technology, the invention provides the sucker rod paraffin scraping centralizer which has the advantages of good paraffin removal effect and capability of preventing wax accumulation of an oil pipe and the sucker rod, and solves the problems in the background technology.
A wax scraping centralizer of a sucker rod comprises a centralizer main body, wherein the upper part of the centralizer main body is fixedly connected with a threaded connector, the middle part of the bottom end of the centralizer main body is fixedly connected with a threaded connecting sleeve, the side surface of the centralizer main body is fixedly connected with a plurality of groups of sleeves, one side of the inner wall of the sleeve is fixedly connected with a spring, the other end of the spring is fixedly connected with a limiting block, the other side of the limiting block is fixedly connected with a connecting rod movably sleeved with the sleeve, the other end of the connecting rod is movably sleeved with a ball, one end of the outer side of the connecting rod is movably sleeved with a spiral fan blade, a circulation cavity is arranged in the centralizer main body, the upper part and the lower part of the circulation cavity are both fixedly connected with supporting rods, the middle part of the circulation cavity is provided with an adjusting device, the upper portion threaded connection of centralizer main part has the connector, the jet orifice has been seted up on the upper portion of connector.
Preferably, adjusting device includes the ring carrier, the telescopic link has been cup jointed in the middle part activity of ring carrier, the upper portion fixedly connected with limiting plate of telescopic link, the middle part activity of telescopic link cup jointed with ring carrier bottom fixed connection's first permanent magnet, the bottom fixedly connected with second permanent magnet of telescopic link, the below of second permanent magnet be provided with circulation chamber fixed connection's current-limiting ring.
Preferably, the first permanent magnet and the second permanent magnet are arranged in a repelling state, and a rubber sealing gasket is arranged at the bottom of the second permanent magnet.
Preferably, the support rod is streamline and the upper side and the lower side are arranged in a water drop shape.
Preferably, the bottom of the circulation cavity is provided with a horn-shaped opening, and the upper part of the circulation cavity is connected with a cavity, which is internally provided with a plurality of groups of injection holes matched with the connector.
Preferably, the outer end face of the spiral fan blade is slightly lower than the ball.
The invention has the following beneficial effects:
1. the bottom of the circulation cavity is provided with the horn-shaped opening, the upper part of the circulation cavity is connected with the cavity with the jet holes in the connector, when the centralizer descends, crude oil flows upwards through the circulation cavity and is jetted out of the cavity in the connector from the jet holes, as the jet holes are provided with a plurality of groups and are distributed in a semicircular shape, the crude oil can wash the outer wall of the sucker rod and the inner wall of the oil pipe, the precipitated wax is prevented from being adhered to the inner wall of the oil pipe and the outer wall of the sucker rod, the problem of wax deposition on the inner wall of the oil pipe is solved while the sucker rod is centralized, wherein, the first permanent magnet and the second permanent magnet repel each other, the circulation cavity can be closed when the centralizer moves downwards, the circulation cavity is opened when the centralizer descends, and the arrangement of the permanent magnets can magnetize the crude oil, the wax precipitation point of the crude oil can be reduced after magnetization, and the viscosity of the crude oil can be reduced, the flowability of the crude oil in an oil conveying pipe is improved, the conveying resistance is reduced, and the blockage of a jet hole can be avoided.
2. Through the setting of helical fan blade for when the centralizer reciprocated, helical fan blade took place to rotate under the pushing action of crude oil, broken up ball paraffin all around, prevented that paraffin adhesion from on the ball surface, carried out scraping to a certain extent to the waxing of oil pipe inner wall simultaneously, made the ball can the free roll, reduced the friction of centralizer and oil pipe inner wall, prolonged the life of ball.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic view of the external structure of the present invention;
FIG. 3 is a bottom view of the present invention;
FIG. 4 is a schematic view of a structural adjustment device of the present invention;
FIG. 5 is a schematic cross-sectional view of a structural adjustment device of the present invention;
FIG. 6 is a schematic view of the overall structure adjustment device of the present invention;
FIG. 7 is a cross-sectional view of a structural joint according to the present invention;
FIG. 8 is a cross-sectional view of a structural brace in accordance with the present invention;
FIG. 9 is a schematic diagram of the oil pumping process of the oil pump;
fig. 10 is a schematic diagram of the oil pumping process of the oil well pump.
In the figure: 1. a centralizer body; 2. a threaded connector; 3. a threaded connecting sleeve; 4. a sleeve; 5. a spring; 6. a limiting block; 7. a connecting rod; 8. a ball bearing; 9. a helical fan blade; 10. a flow-through chamber; 11. a support bar; 12. an adjustment device; 1201. an annular support frame; 1202. a telescopic rod; 1203. a limiting plate; 1204. a first permanent magnet; 1205. a second permanent magnet; 1206. a flow-limiting ring; 13. a connector; 14. and ejecting the hole.
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. 1-8, a sucker rod paraffin scraping centralizer comprises a centralizer body 1, a threaded connector 2 is fixedly connected to the upper portion of the centralizer body 1, a threaded connection sleeve 3 is fixedly connected to the middle portion of the bottom end of the centralizer body 1, a plurality of sets of sleeves 4 are fixedly connected to the side surface of the centralizer body 1, a spring 5 is fixedly connected to one side of the inner wall of each sleeve 4, a limiting block 6 is fixedly connected to the other end of each spring 5, a connecting rod 7 movably sleeved with each sleeve 4 is fixedly connected to the other side of each limiting block 6, a ball 8 is movably sleeved at the other end of each connecting rod 7, a helical fan blade 9 is movably sleeved at one end of the outer side of each connecting rod 7, a circulation cavity 10 is formed in the centralizer body 1, supporting rods 11 are fixedly connected to the upper portion and the lower portion of each circulation cavity 10, an adjusting device 12 is arranged in the middle portion of each circulation cavity 10, a connector 13 is threadedly connected, the upper part of the connector 13 is provided with a plurality of groups of injection holes 14 matched with the connector 13.
Wherein, the adjusting device 12 comprises an annular support frame 1201, an extension rod 1202 is movably sleeved in the middle of the annular support frame 1201, a limit plate 1203 is fixedly connected to the upper part of the extension rod 1202, a first permanent magnet 1204 fixedly connected to the bottom of the annular support frame 1201 is movably sleeved in the middle of the extension rod 1202, a second permanent magnet 1205 is fixedly connected to the bottom of the extension rod 1202, a flow-limiting ring 1206 fixedly connected to the circulation cavity 10 is arranged below the second permanent magnet 1205, and through the cooperation of the second permanent magnet 1205, the extension rod 1202 and the first permanent magnet 1204, when the sucker rod drives the centralizer to descend, the second permanent magnet 1205 moves upwards under the action of crude oil, so that the crude oil passes through the circulation cavity 10, the crude oil can flow from the side of the centralizer, and can pass through the centralizer to reduce the resistance of the crude oil, when the sucker rod drives the centralizer to ascend, the second permanent magnet 1205 forms a seal with the flow-limiting ring 1206, preventing the circulation of crude oil inside the circulation chamber 10.
Wherein, first permanent magnet 1204 and second permanent magnet 1205 are the state setting of repelling each other, and the bottom of second permanent magnet 1205 is provided with rubber packing, repel each other through first permanent magnet 1204 and second permanent magnet 1205, can guarantee to close circulation chamber 10 when centralizer moves down, open circulation chamber 10 when centralizer descends, and the setting of first permanent magnet 1204's second permanent magnet 1205, can magnetize crude oil, not only can reduce the wax precipitation point of crude oil after the magnetization, make the difficult wax precipitation of crude oil, and can reduce crude oil viscosity, improve the mobility of crude oil in defeated oil pipe, reduce the conveying resistance, can avoid blockking up jet orifice 14 simultaneously.
Wherein, the bracing piece 11 is streamlined and the upper and lower side is the drop shape setting, reduces the circulation resistance of crude oil in the inside circulation chamber 10.
Wherein, the bottom of circulation chamber 10 is provided with tubaeform opening, and the upper portion of circulation chamber 10 is connected with the inside cavity of seting up jet orifice 14 of connector 13, when the centralizer descends, crude oil upwards flows through circulation chamber 10, spout by jet orifice 14 in the inside cavity of connector 13, because jet orifice 14 is provided with a plurality of groups, and semicircular in shape distributes, make crude oil wash away sucker rod outer wall and oil pipe inner wall, the wax adhesion that prevents to appear is on oil pipe inner wall and sucker rod outer wall, the problem of oil pipe inner wall wax deposition has been solved when centralizing the sucker rod.
Wherein, helical fan blade 9's outside terminal surface is less than ball 8 a little, avoids helical fan blade 9 and oil pipe inner wall contact, when the centralizer reciprocated, helical fan blade 9 took place to rotate under the pushing action of crude oil, breaks up ball 8 paraffin all around, prevents that paraffin adhesion from on ball 8 surface, carries out scraping to a certain extent to the paraffin deposition of oil pipe inner wall simultaneously for ball 8 can freely roll, reduces the friction of centralizer and oil pipe inner wall.
The theory of operation, when the centralizer descends, crude oil upwards flows through circulation chamber 10, spout by jet orifice 14 in the inside cavity of connector 13, because jet orifice 14 is provided with a plurality of groups, and semicircular distribution, make crude oil can wash away sucker rod outer wall and oil pipe inner wall, prevent that the wax adhesion that separates out is on oil pipe inner wall and sucker rod outer wall, the problem of oil pipe inner wall waxing has been solved when strengthening the sucker rod, simultaneously, through first permanent magnet 1204 and second permanent magnet 1205, not only can reduce the wax precipitation point of crude oil, make crude oil be difficult for separating out the wax, and can reduce crude oil viscosity, improve the mobility of crude oil in defeated oil pipe, reduce the transport resistance, can avoid blockking up jet orifice 14 simultaneously.
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 (6)
1. The utility model provides a sucker rod paraffin scraping centralizer, includes centralizer main part (1), the upper portion fixedly connected with threaded connection head (2) of centralizer main part (1), the middle part fixedly connected with thread connection cover (3) of centralizer main part (1) bottom, its characterized in that: the side surface of the centralizer main body (1) is fixedly connected with a plurality of groups of sleeves (4), one side of the inner wall of the sleeve (4) is fixedly connected with a spring (5), the other end of the spring (5) is fixedly connected with a limiting block (6), the other side of the limiting block (6) is fixedly connected with a connecting rod (7) which is movably sleeved with the sleeve (4), the other end of the connecting rod (7) is movably sleeved with a ball (8), one end of the outer side of the connecting rod (7) is movably sleeved with a spiral fan blade (9), a circulation cavity (10) is arranged in the centralizer body (1), the upper part and the lower part of the circulation cavity (10) are fixedly connected with supporting rods (11), the middle part of circulation chamber (10) is provided with adjusting device (12), the upper portion threaded connection of centralizer main part (1) has connector (13), jet orifice (14) have been seted up on the upper portion of connector (13).
2. The sucker rod paraffin scraping centralizer of claim 1, wherein: adjusting device (12) include toroidal support frame (1201), telescopic link (1202) have been cup jointed in the middle part activity of toroidal support frame (1201), the upper portion fixedly connected with limiting plate (1203) of telescopic link (1202), the middle part activity of telescopic link (1202) cup joint with toroidal support frame (1201) bottom fixed connection's first permanent magnet (1204), the bottom fixedly connected with second permanent magnet (1205) of telescopic link (1202), the below of second permanent magnet (1205) is provided with the current-limiting ring (1206) with circulation chamber (10) fixed connection.
3. The sucker rod paraffin scraping centralizer of claim 2, wherein: the first permanent magnet (1204) and the second permanent magnet (1205) are arranged in a repelling state, and a rubber sealing gasket is arranged at the bottom of the second permanent magnet (1205).
4. The sucker rod paraffin scraping centralizer of claim 1, wherein: the support rod (11) is streamline and the upper side and the lower side of the support rod are arranged in a water drop shape.
5. The sucker rod paraffin scraping centralizer of claim 1, wherein: the bottom of the circulation cavity (10) is provided with a horn-shaped opening, and the upper part of the circulation cavity (10) is connected with a cavity, which is internally provided with a plurality of groups of injection holes (14) matched with the connector (13), of the connector (13).
6. The sucker rod paraffin scraping centralizer of claim 1, wherein: the outer side end face of the spiral fan blade (9) is slightly lower than the ball (8).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911365351.1A CN111058781B (en) | 2019-12-26 | 2019-12-26 | Sucker rod paraffin scraping centralizer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911365351.1A CN111058781B (en) | 2019-12-26 | 2019-12-26 | Sucker rod paraffin scraping centralizer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111058781A true CN111058781A (en) | 2020-04-24 |
| CN111058781B CN111058781B (en) | 2022-01-28 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911365351.1A Active CN111058781B (en) | 2019-12-26 | 2019-12-26 | Sucker rod paraffin scraping centralizer |
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| Country | Link |
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| CN (1) | CN111058781B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111636831A (en) * | 2020-06-19 | 2020-09-08 | 肖云东 | Elastic centralizer |
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|---|---|---|---|---|
| CN203499586U (en) * | 2013-09-26 | 2014-03-26 | 王刚 | Multi-edge blunt arc double oblique jet flow stabilizer |
| CN206801528U (en) * | 2017-03-08 | 2017-12-26 | 辽宁山水科技有限公司 | A kind of new wax cleaning tube |
| CN108756775A (en) * | 2018-06-13 | 2018-11-06 | 大庆市晟威机械制造有限公司 | A kind of elastic oil pumping rod centering device in oil field |
| CN208594879U (en) * | 2018-07-09 | 2019-03-12 | 中国石油天然气股份有限公司 | Oil pumping rod centering device, pumping pipe string and oil pumping system |
| US20190178056A1 (en) * | 2017-08-08 | 2019-06-13 | Saudi Arabian Oil Company | In-situ heating fluids with electromagnetic radiation |
-
2019
- 2019-12-26 CN CN201911365351.1A patent/CN111058781B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203499586U (en) * | 2013-09-26 | 2014-03-26 | 王刚 | Multi-edge blunt arc double oblique jet flow stabilizer |
| CN206801528U (en) * | 2017-03-08 | 2017-12-26 | 辽宁山水科技有限公司 | A kind of new wax cleaning tube |
| US20190178056A1 (en) * | 2017-08-08 | 2019-06-13 | Saudi Arabian Oil Company | In-situ heating fluids with electromagnetic radiation |
| CN108756775A (en) * | 2018-06-13 | 2018-11-06 | 大庆市晟威机械制造有限公司 | A kind of elastic oil pumping rod centering device in oil field |
| CN208594879U (en) * | 2018-07-09 | 2019-03-12 | 中国石油天然气股份有限公司 | Oil pumping rod centering device, pumping pipe string and oil pumping system |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111636831A (en) * | 2020-06-19 | 2020-09-08 | 肖云东 | Elastic centralizer |
| CN111636831B (en) * | 2020-06-19 | 2021-03-23 | 大庆市宏博晟达石油机械设备有限公司 | Elastic centralizer |
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| Publication number | Publication date |
|---|---|
| CN111058781B (en) | 2022-01-28 |
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Effective date of registration: 20220113 Address after: 131300 Linjiang Street 157, Daan City, Baicheng City, Jilin Province Applicant after: DAAN HONGYUAN PIPE CO.,LTD. Address before: 430000 No.1, 1st floor, unit 1, building 1, No.335, Xiongchu Avenue, Hongshan District, Wuhan City, Hubei Province Applicant before: Xu Dong |
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