CN107269244B - Annular seal assembly - Google Patents
Annular seal assembly Download PDFInfo
- Publication number
- CN107269244B CN107269244B CN201710711430.8A CN201710711430A CN107269244B CN 107269244 B CN107269244 B CN 107269244B CN 201710711430 A CN201710711430 A CN 201710711430A CN 107269244 B CN107269244 B CN 107269244B
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- sealing
- locking ring
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- ring
- seal assembly
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- 238000007789 sealing Methods 0.000 claims abstract description 101
- 239000002184 metal Substances 0.000 claims abstract description 82
- 229920001971 elastomer Polymers 0.000 claims description 14
- 239000000806 elastomer Substances 0.000 claims description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 9
- 239000007788 liquid Substances 0.000 claims description 7
- 238000003825 pressing Methods 0.000 claims description 5
- 238000005553 drilling Methods 0.000 abstract description 6
- 238000004519 manufacturing process Methods 0.000 abstract description 5
- 230000002457 bidirectional effect Effects 0.000 abstract description 4
- 239000000463 material Substances 0.000 abstract description 4
- 239000003208 petroleum Substances 0.000 abstract description 4
- 230000000694 effects Effects 0.000 description 7
- 230000009471 action Effects 0.000 description 6
- 238000013461 design Methods 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 3
- 230000006835 compression Effects 0.000 description 3
- 238000007906 compression Methods 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000010030 laminating Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 239000003566 sealing material Substances 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
- E21B33/02—Surface sealing or packing
- E21B33/03—Well heads; Setting-up thereof
- E21B33/035—Well heads; Setting-up thereof specially adapted for underwater installations
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/10—Geothermal energy
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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)
- Gasket Seals (AREA)
Abstract
The invention relates to the technical field of sealing devices, in particular to an annular sealing assembly which is used for sealing between a high-pressure wellhead and a casing hanger, wherein the high-pressure wellhead is provided with a lock ring groove; the annular seal assembly includes: the inner surface and the outer surface of the metal sealing body are provided with raised metal sealing contacts which are used for being contacted with the outer side surface of the casing hanger and the inner surface of the high-pressure wellhead; and a locking ring coupled to the metal seal body and locking the metal seal body between an outer surface of the casing hanger and an inner surface of the high pressure wellhead head when snapped into the locking ring groove. The sleeve is hung and sealed through the metal sealing piece, and then the sleeve is clamped and fixed in the locking ring groove through the locking ring, so that the metal sealing piece and the high-pressure wellhead are tightly connected and sealed, the upper and lower bidirectional sealing is realized, the pure metal sealing piece is sealed without any additional other auxiliary materials, various working conditions of the existing petroleum drilling and production can be met, and the high-pressure metal sealing under the wide-temperature condition can be realized.
Description
Technical Field
The invention relates to the technical field of sealing devices, in particular to an annular sealing assembly.
Background
The subsea wellhead system annular seal assembly ASA (Annulus Seal Assembly) is the most critical component of the subsea wellhead system, and its seal performance and operational reliability directly impact and determine the overall offshore oil production system safety and operational life. The sealing pressure grade of the annular sealing assembly ASA belongs to high pressure and even ultrahigh pressure, the working condition is complex, and the performance requirements are very high. Besides meeting the requirements of sealing and corrosion resistance, the designed sealing device also needs to meet the performance requirements of wide temperature range (design temperature: 20 ℃ below zero to 150 ℃), long service life, impact resistance, fatigue resistance and the like. The annular sealing assembly can be remotely controlled to be placed to the underwater wellhead sealing position through the lowering tool and is in a sealing state, so that the sealing difficulty is increased, the annular sealing assembly also needs to be recovered after the life is completed, and the lowering and recovery are simple and reliable, and are also problems to be considered in the design of the sealing assembly.
The annular seal assembly of the underwater wellhead head provides pressure sealing between each layer of sleeve hanger and the underwater wellhead head, is pressure control equipment of the underwater wellhead head system, and the sealing performance of the annular seal assembly directly influences the reliability and stability of the whole underwater wellhead head system.
The subsea wellhead systems place high demands on the sealing technology, including high seal pressure ratings, sealing materials resistant to the H2S environment, wide temperature ranges of sealing, etc. At present, no deep water oil and gas drilling equipment such as a water well head system exists in China, and one bottleneck for restricting the development of the deep water oil and gas drilling equipment is that sealing devices suitable for ocean deep water oil and gas exploitation systems are not developed in China. There is a great gap between the sea and the home and abroad in the aspect of the sea deep water sealing technology.
The existing common seal assembly generally consists of an upper driving body and a lower seal body. The inner wall of the sealing assembly is provided with a structure matched with the lowering tool. The sealing assembly matched with the lowering tool is hung down along the sleeve, and after the sealing assembly is hung down on the outer ring shaft shoulder of the sleeve, the upper driving body of the sealing ring assembly extrudes the lower sealing body until the sealing effect is achieved.
The main characteristics of the existing common sealing assembly are as follows: and when the body is extruded by the rubber elastomer covered in the lip, the lip is extruded by the elastomer, so that the lip is sealed with the body. It is also possible to squeeze the metal body directly inside the metal lip so that the lip squeezes to seal with the body. The disadvantage of this construction is that because the lip is relatively thin, the lip is more prone to snagging on the open side of the lip during the passage of the seal assembly through the riser and blowout preventer, thereby causing seal failure.
Disclosure of Invention
In response to the deficiencies of the prior art, the present invention provides an annular seal assembly.
To achieve the above objects, the present invention provides an annular seal assembly for sealing between a high pressure wellhead having a locking groove and a casing hanger;
the annular seal assembly includes:
a metal seal body having raised metal seal contacts on the inner and outer surfaces for contact with the outside surface of the casing hanger and the inner surface of the high pressure wellhead; and
a locking ring is coupled with the metal seal body and locks the metal seal body between an outer side surface of the quill hanger and an inner surface of the high pressure wellhead when snapped into the locking ring groove.
In the above annular seal assembly, further, the metal seal body is internally filled with a compressible elastomer or incompressible liquid for pressing the metal seal body so that the metal seal contact generates a reaction force to the casing hanger and the high pressure wellhead.
According to the annular sealing assembly provided by the embodiment of the invention, the sleeve is hung and sealed through the metal sealing element, and then the sleeve is clamped and fixed in the locking ring groove through the locking ring, so that the metal sealing element and the high-pressure well head are tightly connected and sealed, the upper and lower bidirectional sealing is realized, the sealing of the pure metal sealing element without any additional other auxiliary materials is realized, the current various working conditions of petroleum drilling and production can be met, and the high-pressure metal sealing under the wide-temperature condition can be realized.
In addition, the annular sealing assembly provided by the embodiment of the invention has the following technical characteristics:
in the above annular seal assembly, preferably, the elastic body is rubber, and the liquid is oil or water.
In the above annular seal assembly, further, the outer surface of the lock ring is configured with a protrusion, and the shape of the protrusion is adapted to the shape of the lock ring groove.
In the above annular sealing assembly, further, the protruding portion has a protruding tooth shape, and the locking ring groove has an inwardly concave tooth shape.
In the annular sealing assembly, the annular sealing assembly further comprises a driving pressing ring, wherein the inclined surface of the driving pressing ring is contacted with the inclined surface of the locking ring;
wherein,,
a plane contact surface is processed below the inclined surface of the driving compression ring, and a contact plane clamped with the plane contact surface is processed above the inclined surface of the locking ring.
In the above annular seal assembly, further comprising a main body disposed between the locking ring and the metal seal body;
the main body is in threaded connection with the metal sealing body, and the main body is connected with the locking ring through a locking ring anti-rotation pin.
In the annular sealing assembly, the annular sealing assembly further comprises driving pins, the driving pins are six driving pins which are uniformly distributed on one circle of the main body and are provided with dustproof sealing rings, the upper inclined planes of the driving pins are in contact with the lower inclined planes of the locking rings, and the lower end faces of the driving pins are in contact with the top of the sleeve hanger so as to push the driving pins upwards, so that the locking rings are outwards opened and locked into the locking ring grooves.
In the above annular seal assembly, further, the annular seal assembly further comprises a positioning steel wire, wherein the positioning steel wire is arranged between the main body and the metal seal main body.
In the annular sealing assembly, the annular sealing assembly further comprises a linkage ring, wherein the linkage ring is clamped between the main body and the driving compression ring.
Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
FIG. 1 is a schematic illustration of an annular seal assembly in accordance with one embodiment of the present invention.
Detailed Description
In order that the above-recited objects, features and advantages of the present invention will be more clearly understood, a further description of the invention will be rendered by reference to specific embodiments thereof which are appended drawings. It should be noted that, in the case of no conflict, the embodiments of the present application and the features in the embodiments may be combined with each other.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced otherwise than as described herein, and therefore the scope of the present invention is not limited to the specific embodiments disclosed below.
As shown in fig. 1, an embodiment of the present invention provides an annular seal assembly for sealing between a high pressure wellhead 1 and a casing hanger 10, the high pressure wellhead 1 having a locking groove 11;
the annular seal assembly includes: a metal seal body 18 and a locking ring 4;
wherein the inner surface 15 and the outer surface 12 of the metal seal body 18 have raised metal seal contacts for contact with the outer side surface 14 of the casing hanger 10 and the inner surface 13 of the high pressure wellhead 1;
the locking ring 4, the locking ring 4 is connected with the metal sealing body 18 and is clamped with the locking ring groove 11.
It is to be understood that fig. 1 shows only a portion on the left side of the central axis of the high-pressure wellhead 1 for simplicity of illustration, and does not show the entire circumferential portion symmetrical to the left side portion along the central axis. The dimensions of the aforementioned metal seal contacts are small and therefore not apparent in fig. 1. When the metal seal body 18 is pressed between the high-pressure wellhead 1 and the casing hanger 10, with this metal seal contact, the joint strength between the metal seal body 18 and the high-pressure wellhead 1 and the casing hanger 10, respectively, can be improved.
The sleeve is hung and sealed through the metal sealing piece, and then the sleeve is clamped and fixed in the locking ring groove through the locking ring, so that the metal sealing piece is tightly connected with the high-pressure wellhead head and sealed, the upper and lower bidirectional sealing is realized, the pure metal sealing piece is sealed without any additional other auxiliary materials, various working conditions of the existing petroleum drilling and production can be met, and the high-pressure metal sealing under the wide-temperature condition can be realized.
In the above-described solution, the inside of the metal seal body 18 is filled with a compressible elastomer or an incompressible liquid for pressing the metal seal body 18 so that the metal seal contacts generate a reaction force against the casing hanger 10 and the high pressure wellhead 1. Further, the elastomer is rubber, and the liquid is oil or water. By pouring rubber or oil or water inside the metal seal body 18, the metal seal contact and the outer side surface 14 of the casing hanger 10 and the inner side surface 13 of the high-pressure wellhead 1 can be promoted to be more closely attached, and the sealing effect can be improved.
In the above technical solution, the outer surface of the locking ring 4 is configured with a protruding part, and the shape of the protruding part is adapted to the shape of the locking ring groove 11. Wherein the protruding part is in the shape of a protruding tooth, and the locking ring groove 11 is in the shape of an inwardly concave tooth. The protruding portion can also be protruding the tooth shape of different angles, and catch groove 11 can also be inwards concave different angle tooth shapes, protruding tooth and sunken tooth joint each other for locking annular seal assembly and high-pressure wellhead 1, foretell mounting means has played simple to operate swift locking effect.
In another technical scheme, still include drive clamping ring 2, the inclined plane of drive clamping ring 2 contacts with the inclined plane of catch 4, and the angle of two inclined planes is the same to better laminating is avoided because the laminating is not good, causes catch 4 to remove bad problem. A plane contact surface 19 is processed below the inclined surface of the driving press ring 2, and a plane clamped with the plane contact surface 19 is processed above the inclined surface of the lock ring 4, so that the effect of the inclined surface of the lock ring 4 and the inclined surface of the driving press ring in the process of lowering can be avoided, and the lock ring 4 is opened in advance.
In another technical scheme, the novel lock ring further comprises a main body 5, wherein the main body 5 is arranged between the lock ring 4 and the metal sealing body 18; wherein, main body 5 and metal seal body 18 are threaded connection, and main body 5 and catch 4 pass through catch anti-rotation pin 6 location. The front part of the main body 5 is inserted into the rear end of the metal sealing body 18 and is positioned and locked through the steel wire 8, so that the connection stability of the main body 5 and the metal sealing body 18 is improved, and the stability of the annular sealing assembly is further improved.
In another technical scheme, the device further comprises driving pins 7, six driving pins 7 are uniformly distributed on the periphery of the main body 5 and provided with dustproof sealing rings 9, the upper inclined surfaces of the driving pins 7 are in contact with the lower inclined surfaces of the locking ring 4, the lower end surfaces 17 are in contact with the top 16 of the casing hanger 10, namely, when the sealing assembly is in place, the upper inclined surfaces of the driving pins 7 drive the lower inclined surfaces of the locking ring 4, so that the locking ring 4 is forced to be outwards opened and locked into the locking ring groove 11.
In another technical scheme, the device further comprises a positioning pin 6, and the positioning pin 6 is arranged at the upper part of the main body 5. The lock ring is positioned by the positioning pin 6 to avoid movement, and the positioning effect is good.
In another technical scheme, the device further comprises a linkage ring 3, and the linkage ring 3 is connected to the side part of the driving press ring 2 through threads. The inner sides of the driving ring 3 and the driving ring 2 are flat, so that the bulge is avoided, and the operation is prevented from being influenced.
The specific use is as follows: under the action of the pushing force F of the running tool, the driving press ring 2 pushes the main body 5 and the metal sealing body 18 downwards by utilizing the plane contact surface 19 with the lock ring 4, the metal sealing body 18 and the outer side 14 of the casing hanger 10 are provided with a matching surface with the same angle, and when the bottom of the driving pin 7 is in contact with the top 16 of the casing hanger 10 under the action of the pushing force, the upper inclined surface of the driving pin 7 and the inner side of the lock ring 4 act to drive the lock ring 4 to open outwards, so that the contact plane 19 of the driving press ring 2 and the lock ring 4 is driven to move to the inclined surface contact, and the inclined surface of the driving press ring 2 pushes the lock ring 4 to press outwards into the well head lock ring groove 11.
At the same time, the bottom of the main body 5 is contacted with the top 16 of the casing hanger 10, the sealing assembly is installed in place, at the moment, the metal sealing body 18 of the sealing assembly is extruded into the annular space of the casing hanger 10 and the high-pressure wellhead 1, the inner side 15 of the metal sealing body 18 is provided with three protruding metal sealing contacts which are contacted with the outer side surface 14 of the casing hanger 10 and realize metal sealing, and the outer surface 12 of the metal sealing body 18 is also provided with three protruding metal contacts which are contacted with the inner surface 13 of the high-pressure wellhead 1 simultaneously to realize metal sealing.
The metal seal body 18 resembles a D-ring seal in the forward hydraulic action of the seal assembly, and the metal seal between the inner surface 15 and the outer surface 12 of the metal seal body 18 and the outer surface 14 of the casing hanger 10 and the inner surface 13 of the high pressure wellhead 1 is more effective. When the pressure is reversely tested from the bottom of the sealing assembly, the positions of the main body 5 of the sealing assembly and the top of the metal sealing body 18 are kept still under the action of the locking ring 4, so that the D-shaped sealing ring of the metal sealing body 18 can be deformed inwards and outwards, and the effect of metal sealing is realized. The annular sealing assembly of the design not only realizes the up-down bidirectional sealing, but also is a pure metal sealing without any additional other auxiliary materials.
The sealing assembly is made of corrosion-resistant metal materials, can meet various working conditions of petroleum drilling and production at present, and can realize high-pressure metal sealing under wide-temperature conditions.
1. The key point of the design is that the metal seal body 18 is utilized to generate reaction force for hollow pouring incompressible elastomer, so that the inner and outer surfaces of the metal seal body 18 are respectively implemented on the outer surface of the casing hanger 10 and the inner surface 13 of the high-pressure wellhead 1 is effectively sealed by metal;
2. the inner surface 15 of the metal sealing body 18 and the outer surface 14 of the casing hanger 10 have the same angle, so that the sealing assembly is easy to be extruded in place under the action of downward pushing force of a running tool, and the metal sealing body 18 is integrally deformed under the action of the whole inclined plane to realize metal sealing with the high-pressure wellhead 1;
3. the contact plane 19 between the driving compression ring 2 and the locking ring 4 can ensure that the sealing assembly can not be seated and hung in advance in the process of lowering, and the sealing assembly can be seated and hung only by contacting the main body 5 and the driving pin 7 with the top 16 of the sleeve hanger 10, and at the moment, the sealing assembly is further completely in place by 45-degree inclined plane extrusion between the locking ring 4 and the locking ring groove 11.
4. The metal sealing body 18 is integrated, and can be welded up and down so as to simplify processing;
5. the metal sealing body 18 is connected with the main body 5 in a torque threaded manner, and can also adopt a locking ring mode to achieve the locking effect; the metal seal 18 may be impregnated with an elastomer by impregnating it with a suitable liquid.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. An annular seal assembly for sealing between a high pressure wellhead (1) and a casing hanger (10), the high pressure wellhead (1) having a locking groove (11);
the annular seal assembly includes:
-a metal seal body (18), the inner surface (15) and the outer surface (12) of the metal seal body (18) having raised metal seal contacts for contact with the outer side surface (14) of the casing hanger (10) and the inner surface (13) of the high pressure wellhead (1); and
-a locking ring (4), the locking ring (4) being coupled with the metal seal body (18) and locking the metal seal body (18) between an outer side surface (14) of the casing hanger (10) and an inner surface (13) of the high pressure wellhead (1) when snapped into the locking ring groove (11).
2. Annular seal assembly according to claim 1, characterized in that the metal seal body (18) is internally filled with a compressible elastomer or incompressible liquid for pressing the metal seal body (18) so that the metal seal contacts generate a reaction force against the casing hanger (10) and the high pressure wellhead (1).
3. The annular seal assembly of claim 2 wherein the elastomer is rubber and the liquid is oil or water.
4. The annular seal assembly according to claim 1, characterized in that the outer surface of the locking ring (4) is configured with a protrusion, the shape of which is adapted to the shape of the locking ring groove (11).
5. The annular seal assembly of claim 4 wherein said boss is convex tooth shaped and said locking groove is concave tooth shaped.
6. The annular sealing assembly according to any one of claims 1 to 5, further comprising a driving pressure ring (2), the inclined surface of the driving pressure ring (2) being in contact with the inclined surface of the locking ring (4);
wherein,,
a planar contact surface (19) is processed below the inclined surface of the driving press ring (2), and a contact plane which is engaged with the planar contact surface (19) is processed above the inclined surface of the lock ring (4).
7. The annular seal assembly according to any one of claims 1 to 6, further comprising a main body (5), said main body (5) being arranged between and said locking ring (4) and said metal seal body (18);
the main body (5) is in threaded connection with the metal sealing body (18), and the main body (5) is connected with the locking ring (4) through a locking ring anti-rotation pin (6).
8. The annular seal assembly according to claim 7, further comprising a driving pin (7), the driving pin (7) being six evenly distributed around the main body (5) with dust-proof sealing rings (9), an upper inclined surface of the driving pin (7) being in contact with a lower inclined surface of the locking ring (4), a lower end surface (17) being in contact with a top (16) of the sleeve hanger (10) to push the driving pin (7) upwards so that the locking ring (4) opens outwards into the locking ring groove (11).
9. The annular seal assembly according to claim 8, further comprising a positioning wire (8), the positioning wire (8) being arranged between the main body (5) and the metal seal main body (18).
10. The annular seal assembly according to any one of claims 8-9, further comprising a linkage ring (3), the linkage ring (3) being clamped between the main body (5) and the driving pressure ring (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710711430.8A CN107269244B (en) | 2017-08-18 | 2017-08-18 | Annular seal assembly |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710711430.8A CN107269244B (en) | 2017-08-18 | 2017-08-18 | Annular seal assembly |
Publications (2)
| Publication Number | Publication Date |
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| CN107269244A CN107269244A (en) | 2017-10-20 |
| CN107269244B true CN107269244B (en) | 2023-07-04 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201710711430.8A Active CN107269244B (en) | 2017-08-18 | 2017-08-18 | Annular seal assembly |
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| CN (1) | CN107269244B (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108360997B (en) * | 2018-05-09 | 2024-02-13 | 上海霞为石油设备技术服务有限公司 | Annular sealing assembly device for deep water |
| CN108487874B (en) * | 2018-05-09 | 2024-02-13 | 上海霞为石油设备技术服务有限公司 | Annular space sealing assembly device |
| CN110552651B (en) * | 2018-06-04 | 2024-06-11 | 上海霞为石油设备技术服务有限公司 | Novel deep water wellhead equipment |
| CN109000914B (en) * | 2018-07-11 | 2024-02-02 | 中海石油(中国)有限公司湛江分公司 | Test device and method for sealing body of annular sealing assembly |
| CN114320211B (en) * | 2020-10-09 | 2024-03-08 | 中国海洋石油集团有限公司 | Thermal recovery positioning insertion sealing device |
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| CN107269244A (en) | 2017-10-20 |
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