CN114086911B - Mechanical packer with spiral self-sealing structure - Google Patents
Mechanical packer with spiral self-sealing structure Download PDFInfo
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- CN114086911B CN114086911B CN202210022923.1A CN202210022923A CN114086911B CN 114086911 B CN114086911 B CN 114086911B CN 202210022923 A CN202210022923 A CN 202210022923A CN 114086911 B CN114086911 B CN 114086911B
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- sealing
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- 238000007789 sealing Methods 0.000 title claims abstract description 51
- 238000012856 packing Methods 0.000 claims abstract description 38
- 230000005540 biological transmission Effects 0.000 claims abstract description 34
- 238000005192 partition Methods 0.000 claims description 8
- 230000002093 peripheral effect Effects 0.000 claims description 3
- 239000012530 fluid Substances 0.000 abstract description 6
- 230000000694 effects Effects 0.000 abstract description 5
- 239000002699 waste material Substances 0.000 abstract description 2
- 238000002347 injection Methods 0.000 description 6
- 239000007924 injection Substances 0.000 description 6
- 239000007788 liquid Substances 0.000 description 5
- 210000003781 tooth socket Anatomy 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000638 solvent extraction Methods 0.000 description 1
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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
- E21B33/128—Packers; Plugs with a member expanded radially by axial pressure
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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 discloses a mechanical packer with a spiral self-sealing structure, and relates to the technical field of oil exploitation. The invention comprises a transmission sleeve, a packing rubber tube and an internal driving tube, wherein a driving sleeve and a driven threaded sleeve are arranged between the transmission sleeve and the internal driving tube, the internal embedded tube is arranged in the transmission sleeve, a driving impeller is arranged in the internal embedded tube, and a rotating shaft of the driving impeller is provided with a driving gear which is meshed with the internal driving tube. According to the invention, by arranging the driving impeller, the driving sleeve, the driven screw sleeve and the built-in driving pipe, and utilizing the occlusion structure of the driving sleeve and the driven screw sleeve and the screw rod structure between the driven screw sleeve and the built-in driving pipe, the driving impeller is impacted by pressurized fluid to rotate so as to drive the driving sleeve and the driven screw sleeve to rotate, so that the built-in driving pipe slides down to extrude the packing rubber pipe to expand and pack; through setting up the back flow and communicating to outside with the transmission sleeve, can retrieve the oil of pressure boost usefulness and participate in the pressure boost effect once more, avoid damaging pipeline subassembly and energy waste because of internal pressure is too big.
Description
Technical Field
The invention belongs to the technical field of oil exploitation, and particularly relates to a mechanical packer with a spiral self-sealing structure.
Background
The packer is an important device commonly used in oil exploitation work, and is mainly used for partitioning an upper oil layer and a lower oil layer so as to facilitate layered oil extraction; the types of the packers in the prior art are more, but the most common packer is a mechanical packer, and the packer is widely adopted due to simple structure and simple and convenient actual operation; however, the pressure relief operation and the unsealing operation of the mechanical packer in the prior art after the packer is sealed off are both realized by other related equipment, for example, a special fishing tool needs to be put into the packer during fishing and unsealing of the Y455 packer disclosed in the market, which is easy to cause operation difficulty when the design depth is too low, and therefore, in order to solve the problem, a mechanical packer with a spiral self-sealing structure is designed.
Disclosure of Invention
The invention aims to provide a mechanical packer with a spiral self-sealing structure, which solves the problem that a fishing tool is difficult to drop in the conventional packer during fishing and unsealing.
In order to solve the technical problems, the invention is realized by the following technical scheme:
the invention relates to a mechanical packer with a spiral self-sealing structure, which comprises a transmission sleeve, a packing rubber tube and a built-in driving tube, wherein the built-in driving tube is sleeved inside the transmission sleeve and is in sliding fit with the transmission sleeve; one end of the built-in driving pipe is connected with the packing rubber pipe in a sealing and clamping mode, the transmission sleeve, the packing rubber pipe and the built-in driving pipe are communicated with each other, and during actual work, the built-in driving pipe can press down the packing rubber pipe to enable the packing rubber pipe to expand and deform transversely when sliding downwards, so that a packing effect is achieved;
the inner surface of the transmission sleeve is welded with an embedded pipe, the lower end of the embedded pipe is welded with a seat sealing pipe, and the embedded pipe, the seat sealing pipe and the seat sealing pipe form an integrated structure; the embedded pipe extends into the packing rubber pipe through the built-in driving pipe, and the upper end of the seat sealing pipe is in sealing clamping connection with the packing rubber pipe, so that the packing rubber pipe presses down the whole packer when the built-in driving pipe presses down and expands, and the connection stability between the packing rubber pipe and a pipeline is enhanced; a driving sleeve and a driven threaded sleeve are arranged between the transmission sleeve and the built-in driving pipe, wherein the driving sleeve and the driven threaded sleeve are rotationally clamped with the transmission sleeve; the driven swivel nut and the built-in driving pipe are mutually meshed through threads to form a screw rod structure, namely, the built-in driving pipe slides downwards to press the packing rubber pipe when the driven swivel nut rotates; the joint part of the driven screw sleeve and the driving sleeve forms a gear meshing structure by arranging a tooth groove;
the inner surface of the embedded pipe is connected with a driving impeller in a shaft mode, the inner part of the embedded pipe can rotate under the impact of fluid, one end of a rotating shaft of the driving impeller extends to a position between the embedded pipe and the transmission sleeve, and a driving gear is welded on the end face of the rotating shaft; tooth grooves are formed in the upper end face of the driving sleeve, the driving sleeve is meshed with the driving gear through the tooth grooves and matched with the meshing structure between the driven threaded sleeve and the driving sleeve, and the driving impeller is used for driving the driven threaded sleeve to rotate.
Further, the shunt tubes are installed at the upper end of the transmission sleeve, partition plates are adhered to the inner surfaces of the shunt tubes, the upper ends of the shunt tubes are connected with the two pressurizing pipelines through the partition plates, and the two pressurizing pipelines are independent of each other when connected with the pressurizing oil pump.
Furthermore, a splitter plate is adhered to the inner surface of the embedded pipe, and the adhesion directions of the splitter plate and the splitter plate are the same; when the packing work is carried out, one of the pressurization pipelines is communicated for oil injection and pressurization, and the other pressurization pipeline is communicated for oil injection and pressurization during unpacking, so that the forward and reverse rotation of the driving impeller is realized, and the vertical reciprocating sliding of the built-in driving pipe is driven; the flow distribution plate is arranged above the driving impeller.
Furthermore, a plurality of collecting pipes are bonded on the inner side surface of the bottom end of the embedded pipe, a collecting box is welded and communicated with the upper end surfaces of the plurality of collecting pipes, and a return pipe is welded and communicated with the upper surface of the collecting box; the upper end surface of the transmission sleeve is provided with a backflow hole, and the backflow pipe is attached to and extends along the inner wall of the embedded pipe to be communicated with the backflow hole; the oil is recovered by the external pipeline at the position of the return hole, and when the oil injection pressurization packing or unpacking is carried out, the oil is accumulated at the position of the seat pipe, is discharged and recovered through the collecting pipe, the collecting box and the return pipe in sequence, and can be connected into the pressurization pipeline again for circulating pressurization.
Furthermore, a sealing clamping plate is adhered to the peripheral side face of the built-in driving pipe, a sealing baffle is adhered to the inner side face of the driving sleeve, the sealing clamping plate is arranged below the sealing baffle, the sliding range of the built-in driving pipe is limited, and the joint of the built-in driving pipe and the sealing baffle is sealed.
The invention has the following beneficial effects:
according to the invention, by arranging the driving impeller, the driving sleeve, the driven screw sleeve and the built-in driving pipe, and utilizing the occlusion structure of the driving sleeve and the driven screw sleeve and the screw rod structure between the driven screw sleeve and the built-in driving pipe, the driving impeller is impacted by pressurized fluid to rotate so as to drive the driving sleeve and the driven screw sleeve to rotate, so that the built-in driving pipe slides down to extrude the packing rubber pipe to expand and pack; wherein communicate to the outside through setting up the back flow with the transmission sleeve, can retrieve the oil of pressure boost usefulness and participate in the pressure boost effect once more, avoided damaging the phenomenon emergence of pipeline subassembly and energy waste because of internal pressure is too big.
Of course, it is not necessary for any product in which the invention is practiced to achieve all of the above-described advantages at the same time.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic view of the overall structure of a mechanical packer with a spiral self-sealing structure according to the present invention;
FIG. 2 is a partial view of portion A of FIG. 1;
FIG. 3 is a top view of a mechanical packer with a spiral self-sealing structure of the present invention;
FIG. 4 is a schematic structural view of section B-B of FIG. 3;
FIG. 5 is a schematic structural view of section C-C of FIG. 3;
FIG. 6 is a partial display view of portion E of FIG. 5;
FIG. 7 is a schematic structural view of section F-F in FIG. 5;
FIG. 8 is a schematic structural view of section D-D in FIG. 3;
FIG. 9 is a partial display view of portion G of FIG. 8;
fig. 10 is a partial view of portion H of fig. 8.
In the drawings, the components represented by the respective reference numerals are listed below:
1. a drive sleeve; 2. sealing the rubber tube; 3. a driving pipe is arranged inside; 101. embedding a tube; 102. sealing the tube; 4. a drive sleeve; 5. a driven threaded sleeve; 1011. driving the impeller; 1012. a drive gear; 6. a shunt tube; 601. a partition plate; 1013. a flow distribution plate; 1014. a collector pipe; 1015. a junction box; 1016. a return pipe; 103. a return orifice; 301. a sealing clamping plate; 401. and sealing the baffle.
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.
In the description of the present invention, it is to be understood that the terms "upper", "middle", "outer", "inner", and the like, indicate orientations or positional relationships, are used for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the referenced components or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.
Example 1:
referring to fig. 1-10, the present invention is a mechanical packer with a spiral self-sealing structure, which includes a transmission casing 1, a packing rubber tube 2 and a built-in driving tube 3, wherein the built-in driving tube 3 is sleeved inside the transmission casing 1 and is in sliding fit with the transmission casing 1; one end of the built-in driving pipe 3 is connected with the packing rubber pipe 2 in a sealing and clamping mode, the transmission sleeve 1, the packing rubber pipe 2 and the built-in driving pipe 3 are communicated with each other, and in actual work, the built-in driving pipe 3 can press the packing rubber pipe 2 downwards to enable the packing rubber pipe 2 to expand and deform transversely when sliding downwards, so that a packing effect is achieved;
an embedded pipe 101 is welded on the inner surface of the transmission sleeve 1, and a seat sealing pipe 102 is welded at the lower end of the embedded pipe 101, wherein the three parts form an integrated structure; the embedded pipe 101 extends into the packing rubber pipe 2 through the built-in driving pipe 3, and the upper end of the seat packing pipe 102 is in sealing clamping connection with the packing rubber pipe 2, so that the packing rubber pipe 2 presses the whole packer downwards when the built-in driving pipe 3 is pressed downwards and expanded, and the connection stability between the packing rubber pipe and a pipeline is enhanced; a driving sleeve 4 and a driven threaded sleeve 5 are arranged between the transmission sleeve 1 and the built-in driving pipe 3, wherein the driving sleeve 4 and the driven threaded sleeve 5 are rotationally clamped with the transmission sleeve 1; the driven swivel nut 5 and the built-in driving pipe 3 are mutually meshed through threads to form a screw rod structure, namely, the built-in driving pipe 3 slides downwards to press the packing rubber pipe 2 when the driven swivel nut 5 rotates; the joint part of the driven screw sleeve 5 and the driving sleeve 4 forms a gear meshing structure by arranging a tooth socket;
the inner surface of the embedded pipe 101 is axially connected with a driving impeller 1011, the inner part of the embedded pipe 101 can be impacted by fluid to rotate, wherein one end of a rotating shaft of the driving impeller 1011 extends to a position between the embedded pipe 101 and the transmission sleeve 1, and the end surface is welded with a driving gear 1012; the upper end face of the driving sleeve 4 is provided with a tooth socket, the tooth socket is meshed with the driving gear 1012 through the tooth socket and is matched with the meshing structure between the driven screw sleeve 5 and the driving sleeve 4, and the driving impeller 1011 is used for driving the driven screw sleeve 5 to rotate.
Preferably, a sealing chuck plate 301 is adhered to the peripheral side surface of the built-in driving tube 3, a sealing baffle 401 is adhered to the inner side surface of the driving sleeve 4, and the sealing chuck plate 301 is arranged below the sealing baffle 401, so as to limit the sliding range of the built-in driving tube 3 and seal the joint of the two.
Example 2:
the upper end of the transmission sleeve 1 is provided with a shunt pipe 6, the inner surface of the shunt pipe 6 is adhered with a partition plate 601, the upper end of the shunt pipe 6 is connected with two pressurizing pipelines through the partition plate 601, and the two pressurizing pipelines are mutually independent when connected with a pressurizing oil pump;
the inner surface of the embedded pipe 101 is adhered with a flow distribution plate 1013, and the adhesion direction of the flow distribution plate 1013 is the same as that of the partition plate 601; when the packing work is carried out, one of the pressurization pipelines is communicated for oil injection and pressurization, and the other pressurization pipeline is communicated for oil injection and pressurization during unpacking, so that the forward and reverse rotation of the driving impeller 1011 is realized, and the built-in driving pipe 3 is driven to slide up and down in a reciprocating manner; the flow distribution plate 1013 is provided above the drive impeller 1011.
Example 3:
a plurality of collecting pipes 1014 are adhered to the inner side surface of the bottom end of the embedded pipe 101, the upper end surfaces of the collecting pipes 1014 are welded and communicated with a collecting box 1015, and the upper surface of the collecting box 1015 is welded and communicated with a return pipe 1016; the upper end surface of the transmission sleeve 1 is provided with a return hole 103, and a return pipe 1016 is attached to and extends along the inner wall of the embedded pipe 101 to be communicated with the return hole 103; the return hole 103 is also externally connected with a pipeline to recover oil, when the oil injection pressurization sealing or unsealing is carried out, the oil is accumulated at the seat pipe 102, is discharged and recovered through the collecting pipe 1014, the collecting box 1015 and the return pipe 1016 in sequence, and can be connected to the pressurization pipeline again to be circularly pressurized.
It should be further noted that the bottom of the setting pipe 102 is a closed structure, and in the sealing process, whether sealing expansion or unsealing is completed can be determined by observing the change of oil backflow speed at the backflow hole 103, and the specific process is that when sealing expansion or unsealing is completed, the driving impeller 1011 does not rotate when being impacted by liquid, a certain sealing effect is generated, and therefore the flow rate of the fluid is reduced, the speed of the liquid backflow at the backflow hole 103 is also changed from fast to slow, and at this time, sealing expansion or unsealing can be determined.
It should be added that, in actual work, when oil is injected into the shunt pipe 6, the pressure is increased by selecting a pipeline on one side, the driving impeller 1011 is extruded and rotated by fluid power, the driving gear 1012 is driven to rotate by the meshing relationship between the driving gear 1012 and the driving sleeve 4, and the built-in driving pipe 3 is driven to slide downwards by the screw structure of the built-in driving pipe 3 and the driving sleeve 4 to extrude the packing rubber pipe 2 so as to expand and pack; the oil liquid after the sealing is finished is discharged through a return pipe 1016; under the driving of liquid flow, the packing rubber tube 2 keeps expansion packing fixation to complete locking;
when the unlocking is needed, the liquid is adjusted to flow into the other pipeline in the shunt pipe, the driving impeller 1011 rotates reversely, the working process is conducted reversely, and the packer can be unlocked.
In the description herein, references to the description of "one embodiment," "an example," "a specific example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The preferred embodiments of the invention disclosed above are intended to be illustrative only. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention. The invention is limited only by the claims and their full scope and equivalents.
Claims (7)
1. The utility model provides a mechanical type packer with structure is proclaimed oneself to spiral, includes driving sleeve (1), packing rubber tube (2) and built-in drive tube (3), its characterized in that: the built-in driving pipe (3) is sleeved inside the transmission sleeve (1) and is in sliding fit with the transmission sleeve (1); one end of the built-in driving pipe (3) is hermetically clamped with the packing rubber pipe (2), and the transmission sleeve (1), the packing rubber pipe (2) and the built-in driving pipe (3) are communicated with each other;
an embedded pipe (101) is welded on the inner surface of the transmission sleeve (1), and a seat sealing pipe (102) is welded at the lower end of the embedded pipe (101); the embedded pipe (101) extends into the packing rubber pipe (2) through the built-in driving pipe (3), and the upper end of the seat packing pipe (102) is in sealing clamping connection with the packing rubber pipe (2); a driving sleeve (4) and a driven threaded sleeve (5) are arranged between the transmission sleeve (1) and the built-in driving pipe (3), wherein the driving sleeve (4) and the driven threaded sleeve (5) are rotationally clamped with the transmission sleeve (1); the driven screw sleeve (5) and the built-in driving pipe (3) are mutually meshed through threads to form a screw rod structure; the joint part of the driven threaded sleeve (5) and the driving sleeve (4) forms a gear meshing structure by arranging a tooth groove;
the inner surface of the embedded pipe (101) is connected with a driving impeller (1011) in a shaft mode, one end of a rotating shaft of the driving impeller (1011) extends to a position between the embedded pipe (101) and the transmission sleeve (1), and the end face is welded with a driving gear (1012); tooth grooves are formed in the upper end face of the driving sleeve (4) and are meshed with the driving gear (1012) through the tooth grooves.
2. The mechanical packer with the spiral self-sealing structure is characterized in that a shunt pipe (6) is installed at the upper end of the transmission casing (1), and a partition plate (601) is adhered to the inner surface of the shunt pipe (6).
3. The mechanical packer with the spiral self-sealing structure as claimed in claim 2, wherein a splitter plate (1013) is adhered to the inner surface of the embedded pipe (101), and the adhesion direction of the splitter plate (1013) is the same as that of the splitter plate (601); the flow distribution plate (1013) is arranged above the driving impeller (1011).
4. The mechanical packer with the spiral self-sealing structure as claimed in claim 3, wherein a plurality of collecting pipes (1014) are bonded to the inner side surface of the bottom end of the embedded pipe (101), a collecting box (1015) is welded and communicated with the upper end surface of the plurality of collecting pipes (1014), and a return pipe (1016) is welded and communicated with the upper surface of the collecting box (1015).
5. The mechanical packer with the spiral self-sealing structure as claimed in claim 4, wherein a backflow hole (103) is formed in the upper end face of the transmission casing (1), and the backflow pipe (1016) is attached to and extends along the inner wall of the embedded pipe (101) to be communicated with the backflow hole (103).
6. The mechanical packer with the spiral self-sealing structure is characterized in that a sealing clamp plate (301) is bonded to the peripheral side face of the built-in driving pipe (3), a sealing baffle plate (401) is bonded to the inner side face of the driving sleeve (4), and the sealing clamp plate (301) is arranged below the sealing baffle plate (401).
7. The mechanical packer with the spiral self-sealing structure is characterized in that the upper end of the shunt pipe (6) is connected with two pressurizing pipelines through a partition plate (601), and the two pressurizing pipelines are mutually independent when connected with a pressurizing oil pump.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210022923.1A CN114086911B (en) | 2022-01-10 | 2022-01-10 | Mechanical packer with spiral self-sealing structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210022923.1A CN114086911B (en) | 2022-01-10 | 2022-01-10 | Mechanical packer with spiral self-sealing structure |
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| Publication Number | Publication Date |
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| CN114086911A CN114086911A (en) | 2022-02-25 |
| CN114086911B true CN114086911B (en) | 2022-04-01 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202210022923.1A Active CN114086911B (en) | 2022-01-10 | 2022-01-10 | Mechanical packer with spiral self-sealing structure |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116398082B (en) * | 2023-06-07 | 2023-09-05 | 太原理工大学 | Multi-aquifer packing device, water taking device and water taking method for deep geothermal well |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4423777A (en) * | 1981-10-02 | 1984-01-03 | Baker International Corporation | Fluid pressure actuated well tool |
| CN213331006U (en) * | 2021-05-06 | 2021-06-01 | 山东兆鑫石油工具有限公司 | Anti-blocking packer |
| CN112983336A (en) * | 2021-05-17 | 2021-06-18 | 东营市海天自动化工程有限责任公司 | Combined integrated oil field packer |
| CN113250642A (en) * | 2021-05-25 | 2021-08-13 | 张梦 | Packer for well cementation |
| CN113863890A (en) * | 2021-10-22 | 2021-12-31 | 盐城市荣嘉机械制造有限公司 | Oil packer |
-
2022
- 2022-01-10 CN CN202210022923.1A patent/CN114086911B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4423777A (en) * | 1981-10-02 | 1984-01-03 | Baker International Corporation | Fluid pressure actuated well tool |
| CN213331006U (en) * | 2021-05-06 | 2021-06-01 | 山东兆鑫石油工具有限公司 | Anti-blocking packer |
| CN112983336A (en) * | 2021-05-17 | 2021-06-18 | 东营市海天自动化工程有限责任公司 | Combined integrated oil field packer |
| CN113250642A (en) * | 2021-05-25 | 2021-08-13 | 张梦 | Packer for well cementation |
| CN113863890A (en) * | 2021-10-22 | 2021-12-31 | 盐城市荣嘉机械制造有限公司 | Oil packer |
Non-Patent Citations (1)
| Title |
|---|
| 可取式液压双向锚定封隔器结构设计;谷开昭等;《石油机械》;19970430;第25卷(第04期);第7-10页 * |
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| CN114086911A (en) | 2022-02-25 |
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Denomination of invention: A mechanical packer with spiral self sealing structure Effective date of registration: 20221027 Granted publication date: 20220401 Pledgee: Dongying Branch of China Postal Savings Bank Co.,Ltd. Pledgor: DONGYING ZHAOXIN INDUSTRY AND TRADE CO.,LTD. Registration number: Y2022980019875 |
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