CN114075940B - Packer structure - Google Patents
Packer structure Download PDFInfo
- Publication number
- CN114075940B CN114075940B CN202010834953.3A CN202010834953A CN114075940B CN 114075940 B CN114075940 B CN 114075940B CN 202010834953 A CN202010834953 A CN 202010834953A CN 114075940 B CN114075940 B CN 114075940B
- Authority
- CN
- China
- Prior art keywords
- packer
- ring
- setting
- rubber assembly
- packer body
- 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.)
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- 229920001971 elastomer Polymers 0.000 claims abstract description 68
- 239000005060 rubber Substances 0.000 claims abstract description 49
- 230000009471 action Effects 0.000 claims abstract description 11
- 239000000806 elastomer Substances 0.000 claims description 19
- 238000010276 construction Methods 0.000 claims description 16
- 239000002184 metal Substances 0.000 claims description 15
- 230000007797 corrosion Effects 0.000 claims description 13
- 238000005260 corrosion Methods 0.000 claims description 13
- 238000012856 packing Methods 0.000 claims description 13
- 239000011248 coating agent Substances 0.000 claims description 12
- 238000000576 coating method Methods 0.000 claims description 12
- 238000003466 welding Methods 0.000 claims description 11
- 230000000694 effects Effects 0.000 claims description 6
- 230000001788 irregular Effects 0.000 claims description 4
- 239000010408 film Substances 0.000 description 14
- 239000000463 material Substances 0.000 description 12
- 239000013039 cover film Substances 0.000 description 3
- 238000006073 displacement reaction Methods 0.000 description 2
- 230000014759 maintenance of location Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 229920001774 Perfluoroether Polymers 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 229920001973 fluoroelastomer Polymers 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- UJMWVICAENGCRF-UHFFFAOYSA-N oxygen difluoride Chemical compound FOF UJMWVICAENGCRF-UHFFFAOYSA-N 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 210000002489 tectorial membrane Anatomy 0.000 description 1
- 238000004073 vulcanization Methods 0.000 description 1
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
- E21B33/127—Packers; Plugs with inflatable sleeve
Landscapes
- 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)
- Piles And Underground Anchors (AREA)
- Gasket Seals (AREA)
Abstract
The invention provides a packer structure, which belongs to the technical field of well cementation, and comprises a packer body, wherein a setting ring and a stop ring are arranged on the packer body; the packer rubber assembly is arranged on the packer body and is arranged between the setting ring and the stop ring; the stop ring is fixedly connected with the packer body, the setting ring slides on the packer body under the action of setting force and pushes the packer rubber cylinder assembly to deform, so that setting is completed.
Description
Technical Field
The invention relates to a packer structure, in particular to a packer structure for well cementation.
Background
With the continuous deep exploration and development, the global oil and gas exploration and development objects are changed from the conventional oil and gas reservoirs to the unconventional oil and gas reservoirs, the target layer rapidly extends from the middle shallow layer to the deep layer and the ultra deep layer, and with the extension of the target layer, a series of harsh conditions such as high stratum temperature, high construction pressure, strong corrosion of underground medium and the like are accompanied, so that higher requirements are put on the tolerance of the packer. At present, the conventional well cementation packer has two main structural forms, namely an expansion type packer and a compression type packer, the packing performance of the two structural forms is dependent on the high-temperature, high-pressure and corrosion resistance of packer rubber assembly materials, and the problems that the high-temperature and high-pressure resistance is poor, the corrosion resistance is poor, the packer rubber assembly is damaged by a well wall in the well entering process, the pumping resistance is poor and the like exist. The invention is innovated from the structure, improves the high-temperature and high-pressure resistance and corrosion resistance of the packer rubber assembly, has better protectiveness, is not easy to be damaged, has cold-pressure welding packing enhancement performance, and effectively solves the problems of high-temperature and high-pressure resistance and poor corrosion resistance of the conventional packer.
Disclosure of Invention
Aiming at the technical problems in the prior art, the invention provides a packer structure, wherein a metal coating film is coated outside an elastomer material, and the metal coating film has better corrosion resistance, deformability and ductility, and can effectively protect the elastomer wiping material of a packer rubber assembly from corrosion or wiping damage
The invention provides a packer structure, which comprises:
the packer comprises a packer body, wherein a setting ring and a stop ring are arranged on the packer body;
The packer rubber assembly is arranged on the packer body and is arranged between the setting ring and the stop ring;
the stop ring is fixedly connected with the packer body, the setting ring slides on the packer body under the action of setting force and pushes the packer rubber cylinder assembly to deform, so that setting is completed.
The invention is further improved in that the packer body is provided with a guide ring, and the middle part of the inner side of the packer rubber assembly is provided with an annular guide groove; the guide ring is disposed within the guide groove.
The invention further improves that the section of the guide ring is of a trapezoid structure, and the section of the guide groove is of a trapezoid structure matched with the section of the guide ring.
The invention further improves that the packer rubber assembly comprises a high-temperature resistant elastomer, and the outer layer of the elastomer is coated with a corrosion-resistant metal coating film.
The invention further improves that the coating film is easy-expansion metal with cold pressure welding performance, and the coating film and the outer sleeve generate certain relative movement under the action of continuous setting force of the setting ring to form cold pressure welding effect.
The invention is further improved in that when the packer rubber assembly is applied to an irregular sleeve, a plurality of protruding structures are arranged on the outer side face of the packer rubber assembly; after setting, the raised structures contact and press against the casing.
The invention further improves that when the packer rubber assembly is applied to regular casings, the outer side face of the packer rubber assembly is provided with an arc-shaped cylindrical face.
The invention is further improved in that the outer wall of the packer body is provided with external threads, and the inner wall of the stop ring is provided with internal threads; the packer body is connected with the stop ring in a matched mode through the external threads and the internal threads.
The invention is further improved in that the setting ring is a metal ring, and the inner diameter of the metal ring is matched with the packer body; one end of the setting ring is contacted with the packer rubber assembly, and the other end of the setting ring receives hydraulic or mechanical setting force at the upper end of the pipe column.
The invention further improves that the upper end and the lower end of the packer body are both provided with a thread structure for connecting the pipe string.
Compared with the prior art, the invention has the advantages that:
The packer structure disclosed by the invention has good high-temperature and high-pressure resistance. The elastomer is made of high-temperature resistant materials, has high-temperature mechanical property retention rate, has high mechanical property in a high-temperature state, and can bear high-pressure action in the high-temperature state.
The packer structure has good corrosion resistance and rubber cylinder protection: the outer part of the elastomer material of the packer rubber assembly is coated with a metal coating film, and the metal coating film has better corrosion resistance, easy deformability and ductility, so that the elastomer material of the packer rubber assembly can be effectively protected from corrosion or scratch damage.
The packer structure of the invention has cold-press welding packing enhancement effect: the covering film in the packer rubber assembly is made of a material with cold pressure welding performance, and after the packer is set, a certain acting force is pressed down, so that the packer rubber assembly and the inner wall of the outer casing are subjected to micro relative displacement, the covering film and the outer casing can generate cold pressure welding effect under the action of continuous acting force of an elastomer material, and the packer packing performance is enhanced.
Drawings
Preferred embodiments of the present invention will be described in detail below with reference to the attached drawing figures, wherein:
FIG. 1 is a schematic illustration of a packer construction of an embodiment of the invention, showing the construction of a packer packing assembly provided with a bulge;
FIG. 2 is a schematic diagram of a packer construction showing the construction of an arcuate cylindrical packer packing assembly in accordance with one embodiment of the invention.
In the drawings, like parts are designated with like reference numerals. The figures are not drawn to scale.
The meaning of the reference numerals in the drawings is as follows: 1. the packer comprises a packer body, 2, a packer rubber assembly, 11, a stop ring, 12, a setting ring, 13, a guide ring, 14, threads, 21, an elastomer, 22, a coating film, 23, a guide groove, 24 and a bulge.
Detailed Description
In order to make the technical solution and advantages of the present invention more apparent, exemplary embodiments of the present invention will be described in further detail below with reference to the accompanying drawings. It will be apparent that the described embodiments are only some of the embodiments of the present invention and are not exhaustive of all embodiments. And embodiments of the invention and features of the embodiments may be combined with each other without conflict.
Fig. 1 schematically shows a packer construction according to an embodiment of the invention, comprising a packer body 1. The packer body 1 is of a cylindrical or tubular structure, which is fixedly connected in a string. In the present embodiment, the outer part of the packer body 1 is sleeved with a setting ring 12 and a stop ring 11, and a certain distance is provided between the setting ring 12 and the stop ring 11. The packer body 1 is sleeved with a packer rubber assembly 2, and the packer rubber assembly 2 is arranged between a setting ring 12 and a stop ring 11.
In this embodiment, the stop ring 11 is fixedly connected to the packer body 1, and the setting ring 12 slides on the packer body 1 under the action of a setting force and pushes the packer rubber assembly 2 to deform, thereby completing setting.
In one embodiment, the packer body 1 is provided with a guide ring 13, and the guide ring 13 has a circular structure, is sleeved on the packer body 1, and is located between the setting ring 12 and the stop ring 11. The middle part of the inner side of the packer rubber assembly 2 is provided with an annular guide groove 23, and the shape of the guide groove 23 is matched with that of the guide ring 13.
When the packer construction according to the present embodiment is used, the packer rubber assembly 2 is pressed to deform when the setting ring 12 slides down under the setting force, and the packer rubber assembly 2 is deformed at the position of the middle guide groove 23 under the action of the guide ring 13 and is set on the casing.
In one embodiment, the cross section of the guiding ring 13 is a trapezoid structure, the width of the side close to the packer body 1 is larger, and the width of the side far away from the packer body 1 is smaller. The cross section of the guide groove 23 is a trapezoid structure matched with the cross section of the guide ring 13. The trapezoid structure of the guide ring 13 is used for supporting the packer rubber assembly 2 more stably, and the structure with the narrow outer side and the wide inner side can increase the force for guiding the deformation of the packer rubber assembly 2.
The cross section of the guide ring 13 may also be triangular, arc-shaped or other shaped structures.
In a preferred embodiment, the packer rubber assembly 2 comprises a high temperature resistant elastomer 21, and the outer layer of the elastomer 21 is coated with a corrosion resistant metal coating 22. Preferably, the material of the elastic body 21 may be rubber, plastic, composite material, or the like. The covering film 22 is completely attached to the elastomer 21 material through the technologies of integral vulcanization or adhesion and the like, and the packer rubber assembly 2 is formed together.
In this embodiment, the elastomer 21 is a special high temperature resistant elastomer 21 material, such as fluororubber and perfluoroether rubber, which has a high retention rate of high temperature mechanical properties, has a high mechanical property in a high temperature state, and can withstand high pressure in a high temperature state. The packer rubber assembly 2 can generate elasticity of movement through the elastomer 21, the elastomer 21 deformed during setting has certain elasticity, continuous pressure is provided for the covering film 22, the covering film 22 is attached to the casing, and the packing force is increased.
In a preferred embodiment, the cover film 22 is an expandable metal with cold-welding performance, and under the action of the continuous setting force of the setting ring 12, the cover film 22 and the outer sleeve move relatively to form a cold-welding effect.
When setting with the packer construction according to this embodiment, the setting ring 12 transmits the setting force to the packer packing assembly 2, and the packer packing assembly 2 is forced to compress and expand, with the protrusions 24 located along the guide groove 23 so that its outer diameter is in contact with the outer casing inner diameter. Under the action of continuous setting force, the packer rubber assembly 2 is tightly attached to the outer sleeve, and the film 22 of the easily-expanded metal is tightly attached to the inner wall of the sleeve to form tight seal; and the elastic body 21 is an incompressible body, and can continuously provide a setting compaction force for the tectorial membrane 22 in a compressed state, so that the packer rubber assembly 2 continuously clings to an outer sleeve, and the packing effect of the packer is ensured. After the packer is set, a certain acting force is pressed down, so that the packer rubber assembly 2 generates tiny relative displacement relative to the set position of the inner wall of the sleeve, cold pressure welding is generated on the basis of the radial acting force of the elastic body 21, and the packing performance is further ensured.
In one embodiment, as shown in fig. 1, when applied to an irregular casing, the outer side surface of the packer rubber assembly 2 is provided with a plurality of protruding structures 24; after setting, the projections 24 are configured to contact and press against the casing.
The bulge 24 can be a punctiform bulge 24 or an annular bulge 24 which winds the packer rubber cylinder assembly for 2 circles. And the structure of the protrusions 24 may be rectangular, trapezoidal, triangular, semicircular, etc. After the packer is set, the projections 24 may first contact the outer casing to form a seal for casing with irregular well bore.
In another embodiment, as shown in FIG. 2, the outer side of the packer packing assembly 2 is configured as an arcuate cylinder when applied to a regular casing. When the setting is completed, the cover film 22 outside the packer rubber assembly 2 is in full contact with the outer casing, and the inner elastomer 21 material provides a continuous setting force.
In one embodiment, the outer wall of the packer body 1 is provided with external threads, and the inner wall of the stop ring 11 is provided with internal threads; the packer body 1 is connected with the stop ring 11 through the matching of the external threads and the internal threads.
In one embodiment, the setting ring 12 is a metal ring with an inner diameter that mates with the packer body 1; one end of the setting ring 12 is in contact with the packer rubber assembly 2, and the other end of the setting ring is used for bearing hydraulic or mechanical setting force of the upper end of the pipe column.
In one embodiment, the upper end and the lower end of the packer body 1 are provided with a thread structure of a connection pipe string. The connecting is stable in a threaded connection mode, and the dismounting is convenient.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the following claims be interpreted as including the preferred embodiment and all alterations and/or modifications that fall within the scope of the invention, and that are intended to be included within the scope of the invention.
Claims (7)
1. A packer construction, comprising:
The packer comprises a packer body (1), wherein a setting ring (12) and a stop ring (11) are arranged on the packer body (1);
a packer rubber assembly (2) arranged on the packer body (1), wherein the packer rubber assembly (2) is arranged between the setting ring (12) and the stop ring (11);
The stop ring (11) is fixedly connected with the packer body (1), and the setting ring (12) slides on the packer body (1) under the action of setting force and pushes the packer rubber assembly (2) to deform, so that setting is completed;
the packer rubber assembly (2) comprises a high-temperature resistant elastomer (21), wherein the outer layer of the elastomer (21) is coated with a corrosion-resistant metal coating film (22);
The coating film (22) is an easily-expanded metal with cold pressure welding performance, and under the action of continuous setting force of the setting ring (12), the coating film (22) and the outer sleeve move relatively to a certain extent to form a cold pressure welding effect;
when the packer rubber assembly is applied to an irregular sleeve, a plurality of protruding (24) structures are arranged on the outer side face of the packer rubber assembly (2); after setting, the boss (24) structures contact and press against the casing.
2. The packer construction according to claim 1, characterized in that the packer body (1) is provided with a guide ring (13), the middle of the inner side of the packer rubber assembly (2) is provided with an annular guide groove (23); the guide ring (13) is arranged in the guide groove (23).
3. A packer construction according to claim 2, characterized in that the cross-section of the guide ring (13) is a trapezoid, and the cross-section of the guide groove (23) is a trapezoid cooperating with the cross-section of the guide ring (13).
4. A packer construction according to claim 3, characterised in that the outer side of the packer packing element assembly (2) is provided as an arcuate cylinder when applied to regular casing.
5. The packer construction according to claim 4, characterized in that the outer wall of the packer body (1) is provided with an external thread and the inner wall of the stop ring (11) is provided with an internal thread; the packer body (1) is connected with the stop ring (11) in a matched mode through the external threads and the internal threads.
6. The packer construction according to claim 5, characterized in that the setting ring (12) is a metal ring with an inner diameter matching the packer body (1); one end of the setting ring (12) is contacted with the packer rubber assembly (2), and the other end of the setting ring is used for bearing hydraulic or mechanical setting force at the upper end of the pipe column.
7. Packer construction according to claim 6, characterized in that the packer body (1) is provided with a thread construction of the connection string at both the upper and lower end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010834953.3A CN114075940B (en) | 2020-08-19 | 2020-08-19 | Packer structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010834953.3A CN114075940B (en) | 2020-08-19 | 2020-08-19 | Packer structure |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114075940A CN114075940A (en) | 2022-02-22 |
| CN114075940B true CN114075940B (en) | 2024-04-26 |
Family
ID=80281795
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010834953.3A Active CN114075940B (en) | 2020-08-19 | 2020-08-19 | Packer structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114075940B (en) |
Citations (10)
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|---|---|---|---|---|
| GB0026908D0 (en) * | 1999-11-05 | 2000-12-20 | Tiw Corp | Downhole passoff assembly |
| CN102287161A (en) * | 2011-07-25 | 2011-12-21 | 上海道氟化工科技有限公司 | Compression packer rubber cylinder, and preparation method and application thereof |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN114075940A (en) | 2022-02-22 |
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