CN113719252B - Composite metal sealing ring of underwater wellhead connector - Google Patents
Composite metal sealing ring of underwater wellhead connector Download PDFInfo
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- CN113719252B CN113719252B CN202110999283.5A CN202110999283A CN113719252B CN 113719252 B CN113719252 B CN 113719252B CN 202110999283 A CN202110999283 A CN 202110999283A CN 113719252 B CN113719252 B CN 113719252B
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- sealing
- sealing ring
- spherical outer
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- corrosion
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP 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
- E21B33/038—Connectors used on well heads, e.g. for connecting blow-out preventer and riser
Abstract
The invention provides a composite metal sealing ring of an underwater wellhead connector, which comprises a sealing ring body in an annular shape, wherein the sealing ring body comprises a spherical outer sealing surface and an inner smooth end surface, two spherical outer sealing surfaces are symmetrically arranged by a boss arranged at the outer center of the sealing ring body, the end part of each spherical outer sealing surface is provided with a corrosion-resistant alloy cushion layer, and the spherical outer sealing surface is also provided with a sealing ring. The concave part design can prevent the sealing ring from being firmly adhered to the conical surfaces of the christmas tree and the wellhead in a high-temperature environment through the spherical outer sealing surface, so that the sealing ring is convenient to install and detach, and meanwhile, the convex part design is beneficial to increasing the contact stress of the main seal when sealing with the conical surface, so that the sealing performance is improved. The sealing structure formed by the corrosion-resistant alloy cushion layer and the sealing ring ensures that the main sealing surface is not damaged in the process of installation and disassembly, has a simple structure, is convenient to process and manufacture, and is particularly suitable for fixing and sealing the deep high-pressure fluid of the ocean.
Description
Technical Field
The invention relates to the technical field of sealing rings, in particular to a composite metal sealing ring of an underwater wellhead connector.
Background
In recent years, as the development of ocean oil and gas is continuously advanced to deep sea areas, the problems of deep water, high temperature and high pressure are more serious, and the sealing device of the underwater wellhead system is also tested. The conventional elastic sealing technology is mature, low in cost and wide in application in the early development stage; however, due to the property problem of the sealing material, the problems of high-temperature degradation, chemical degradation, fatigue caused by cyclic load, abrupt compression load failure, shearing failure of extrusion gaps and the like are easy to occur, and the sealing requirement of the underwater wellhead system at the present stage cannot be met.
Aiming at the problems, the wellhead of the underwater horizontal christmas tree is usually connected by adopting a locking piece type connector, namely, a connection mode of mutually meshed tooth grooves with the groove surfaces of the wellhead is adopted to connect the christmas tree body with the wellhead, and the connector and the wellhead are sealed by adopting metal. The sealing ring for the underwater connector in China mainly adopts a standard sealing ring, and the pretightening force of the sealing ring is large, so that the sealing requirement of the actual working condition of the locking type underwater connector cannot be met.
Disclosure of Invention
The invention aims to provide a composite metal sealing ring of an underwater wellhead connector, which aims to solve the problems in the background technology.
In order to achieve the above purpose, the present invention provides the following technical solutions:
the utility model provides a well head connector combined type metal seal circle under water, includes the sealing washer body that the shape is annular, wherein:
the sealing ring body comprises a spherical outer sealing surface and an inner smooth end surface, wherein the two spherical outer sealing surfaces are symmetrically arranged with a boss arranged at the outer center of the sealing ring body, the end part of the spherical outer sealing surface is filled with a corrosion-resistant alloy cushion layer, and an auxiliary sealing ring is further arranged on the spherical outer sealing surface.
Preferably, a groove for installing an auxiliary sealing ring is arranged at the position, close to the boss, of the spherical outer sealing surface.
Preferably, the spherical outer sealing surface is provided with two concave parts.
Preferably, the spherical outer sealing surface is provided with a convex part.
Preferably, the protrusion is located between two of the dimples.
Preferably, the corrosion-resistant alloy pad layer is a wear-resistant, corrosion-resistant, and ductile material.
Preferably, the corrosion-resistant alloy cushion layer is Ni825 material.
Preferably, the sealing ring body is made of 316L.
Compared with the prior art, the invention has the beneficial effects that:
the concave part design of the spherical outer sealing surface can prevent the sealing ring from being firmly adhered to the conical surfaces of the christmas tree and the wellhead in a high-temperature environment, so that the sealing ring is convenient to mount and dismount, and meanwhile, the convex part is beneficial to increasing the contact stress of the main seal when the sealing ring is sealed with the conical surface, so that the sealing performance is improved. The sealing structure formed by the corrosion-resistant alloy cushion layer and the sealing ring ensures that the main sealing surface is not damaged in the process of installation and disassembly, has a simple structure, is convenient to process and manufacture, and is particularly suitable for fixing and sealing the deep high-pressure fluid of the ocean.
Drawings
FIG. 1 is a cross-sectional view of a seal ring body of the present invention;
FIG. 2 is an overall front cross-sectional view of the seal of the present invention as installed;
FIG. 3 is a schematic view of the installation and positioning of the upper portion of the seal of the present invention in contact with the sealed conical surface;
FIG. 4 is a schematic view of the installation and positioning of the lower portion of the seal of the present invention in contact with the sealed conical surface;
FIG. 5 is a schematic view of the present invention with the seal installed in position;
FIG. 6 is a cloud chart of the overall equivalent stress of the seal ring and the equivalent stress of the seal ring body under the pre-tightening working condition;
FIG. 7 is a cloud chart of equivalent stress of a filling part and equivalent stress of an auxiliary sealing ring under a pre-tightening working condition;
FIG. 8 is a cloud chart of upper auxiliary seal ring contact stress and lower auxiliary seal ring contact stress under a pre-load condition;
FIG. 9 is a cloud chart of corrosion-resistant alloy cushion contact stress on the upper side and corrosion-resistant alloy cushion contact stress on the lower side under a pre-load condition;
FIG. 10 is a cloud chart of the overall equivalent stress of the seal ring and the equivalent stress of the seal ring body under operating conditions;
FIG. 11 is a cloud chart of equivalent stress of a filling part and equivalent stress of an auxiliary sealing ring under an operating condition;
FIG. 12 is a cloud graph of upper fill site contact stress and lower fill site contact stress during operating conditions;
FIG. 13 is a cloud chart of upper auxiliary seal ring contact stress and lower auxiliary seal ring contact stress under operating conditions.
In the figure: the sealing ring comprises a sealing ring body, a spherical outer sealing surface, a 12 inner smooth end surface, a 13 boss, a 14 corrosion-resistant alloy cushion layer, a 15 auxiliary sealing ring, a 16 concave part, a 17 convex part, a 200 underwater Christmas tree body, a 300 underwater wellhead head and a 400 underwater wellhead connector.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Examples:
referring to fig. 1, the present invention provides a technical solution:
the utility model provides a compound metal seal ring of well head connector under water, includes that the shape is annular sealing washer body 1, wherein:
the sealing ring body 1 comprises a spherical outer sealing surface 11 and an inner smooth end surface 12, wherein two spherical outer sealing surfaces 11 are symmetrically arranged with a boss 13 arranged at the outer center of the sealing ring body 1, the spherical outer sealing surfaces 11 are inclined surfaces, two spherical outer sealing surfaces 11 form a splayed shape, the end part of each spherical outer sealing surface 11 is filled with a corrosion-resistant alloy cushion layer 14, a groove for installing an auxiliary sealing ring 15 is formed in the position, close to the boss 13, of each spherical outer sealing surface 11, an auxiliary sealing ring 15 is arranged in the groove, the effect of auxiliary sealing is achieved, two concave parts 16 are formed in each spherical outer sealing surface 11, a protruding part 17 is arranged on each spherical outer sealing surface 11, and the protruding part 17 is located between the two concave parts 16.
Preferably, the corrosion-resistant alloy pad layer 14 is made of a wear-resistant, corrosion-resistant and ductile material, and the corrosion-resistant alloy pad layer 14 is preferably made of a Ni825 material.
Preferably, the material of the seal ring body 1 is 316L.
Preferably, the auxiliary sealing ring 15 is a nitrile-butadiene oil-resistant rubber O-shaped ring.
The composite metal seal ring is used in such a manner that, as shown in fig. 2 to 5, the subsea tree body 200 is connected to the subsea wellhead 300 through the subsea wellhead connector 400, and the seal ring body 1 is disposed between the subsea tree body 200 and the subsea wellhead 300, wherein the boss 13 is in contact with the gap between the tree body 200 and the subsea wellhead 300, and the two spherical outside seal surfaces 11 are in sealing contact with the inclined surfaces of the tree body 200 and the subsea wellhead 300, respectively.
When the christmas tree is put and installed, firstly, the spherical outer sealing surface 11 of the metal sealing ring positioned at the lower side is firstly contacted with the underwater wellhead 300, and due to the protruding design of the lower auxiliary sealing ring 15, the conical surface of the underwater wellhead 300 is firstly contacted with the auxiliary sealing ring 15, and cannot be damaged due to the contact with the bulge 17 of the lower part serving as the main sealing surface. The tree continues to be lowered under gravity until the lower portion of the subsea tree body 200 contacts the upper corrosion resistant alloy pad layer 14, thereby protecting the upper portion of the boss 17, which acts as the primary sealing surface. Thereafter, the metal seal ring is positioned and begins to be compressed to generate an initial pre-compression force, and then the subsea tree body 200 and the subsea wellhead 300 are locked. In underbalanced drilling, in order to prevent external fluid from flowing into the interior, it is necessary to seal the conical surface, and the seal assembly uses a combination of a corrosion resistant alloy pad layer 14 and an auxiliary seal ring 15, so that the seal assembly can resist the internal and external pressure differences in both directions, thereby ensuring sealing performance.
Finite element simulation verification feasibility:
1) Judging method for sealing performance
(1) For metal seal sites:
referring to specifications of GB150-2010 and the like, the sealing ring is subjected to plastic deformation on the premise that the sealing ring meets the sealing requirement; under the pre-tightening working condition, the maximum contact stress of the sealing ring is required to be ensured to be larger than the pre-tightening specific pressure; under working conditions, the maximum contact stress of the sealing ring is ensured to be larger than the product of the medium pressure and the sealing coefficient. The pre-tightening specific pressure of the stainless steel sealing ring is 179.3MPa after consulting specifications of GB150-2010 and the like; the sealing coefficient was 6.5.
(2) For nonmetallic seal sites:
under working conditions, a maximum contact stress greater than the working pressure may be considered to meet the sealing requirements.
2) Method for judging structural strength
Referring to ASME VIII-2 and other specifications, the equivalent stress of the sealing ring body is smaller than the allowable stress, and the local equivalent stress of the sealing part is smaller than the tensile strength of the material.
3) The sealing performance and the structural strength of the sealing ring
In the pre-tightening working condition, the maximum equivalent stress occurs at the metal filling part, the value of the maximum equivalent stress is 204.84MPa, and the plastic deformation of the filler is indicated as the yield strength of the filler is 220MPa, namely the sealing condition is achieved; the filling position is safe because of its tensile strength of 550 MPa. The maximum contact stress of 297.16MPa and 315.52MPa is larger than the sealing specific pressure value 179.5MPa of GB150 standard, which shows that the sealing ring meets the sealing requirement under the pre-tightening working condition, as shown in figures 6-9.
In the working condition, the maximum equivalent stress occurs at the metal filling part, the value of the maximum equivalent stress is 348.02MPa, and the plastic deformation of the filler is indicated as the yield strength of the filler is 220MPa, namely the sealing condition is achieved; the filling position is safe because of its tensile strength of 550 MPa. The maximum contact stress 620.85MPa and 605.94MPa of the upper and lower parts are larger than the medium pressure 448.5NPa of 6.5 times of GB150 standard, which shows that the sealing ring meets the sealing requirement under the working condition. For a nonmetal sealing ring, the key of judging that the sealing ring can be sealed is that the maximum contact stress of the nonmetal sealing ring is larger than the medium pressure; it can be seen from the figure that under the working condition, the maximum contact stress of the upper auxiliary sealing ring and the lower auxiliary sealing ring is 85.595MPa and 89.406MPa respectively and is larger than the medium pressure of 69MPa, which indicates that under the condition that the filling part fails, the auxiliary sealing can replace the filling part to realize sealing, as shown in fig. 10-13.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (7)
1. The utility model provides a well head connector combined type metal seal circle under water, is annular sealing washer body (1) including the shape, its characterized in that:
the sealing ring body (1) comprises a spherical outer sealing surface (11) and an inner smooth end surface (12), wherein two spherical outer sealing surfaces (11) are symmetrically arranged by a boss (13) arranged at the outer center of the sealing ring body (1), the end part of the spherical outer sealing surface (11) is filled with a corrosion-resistant alloy cushion layer (14), and an auxiliary sealing ring (15) is further arranged on the spherical outer sealing surface (11);
a bulge (17) is arranged on the spherical outer sealing surface (11);
the composite metal sealing ring is used in the mode that an underwater Christmas tree body (200) is connected with an underwater wellhead (300) through an underwater wellhead connector (400), a sealing ring body (1) is arranged between the underwater Christmas tree body (200) and the underwater wellhead (300), a boss (13) is in clearance contact with the Christmas tree body (200) and the underwater wellhead (300), and two spherical outer sealing surfaces (11) are respectively in sealing contact with inclined surfaces of the Christmas tree body (200) and the underwater wellhead (300);
when the Christmas tree is installed, firstly, the spherical outer sealing surface (11) of the lower side of the metal sealing ring is firstly contacted with the underwater wellhead (300), and due to the protruding design of the lower auxiliary sealing ring (15), the conical surface of the underwater wellhead (300) is firstly contacted with the auxiliary sealing ring (15) and cannot be damaged due to the contact with the bulge (17) of the lower part serving as the main sealing surface, under the action of gravity, the Christmas tree is continuously lowered until the lower part of the underwater Christmas tree body (200) is contacted with the upper corrosion-resistant alloy cushion layer (14), so that the bulge (17) of the upper part serving as the main sealing surface is protected, and the combined metal sealing ring can resist internal and external pressure differences in two directions by adopting a combined mode of the corrosion-resistant alloy cushion layer (14) and the auxiliary sealing ring (15), so that the sealing performance is ensured.
2. The subsea wellhead connector composite metal seal ring of claim 1, wherein: the spherical outer sealing surface (11) is provided with a groove for installing an auxiliary sealing ring (15) at a position close to the boss (13).
3. The subsea wellhead connector composite metal seal ring of claim 1, wherein: two concave parts (16) are arranged on the spherical outer sealing surface (11).
4. A composite metal seal ring for an underwater wellhead connector according to claim 3, wherein: the bulge (17) is located between two inner recesses (16).
5. The subsea wellhead connector composite metal seal ring of claim 1, wherein: the corrosion-resistant alloy pad layer (14) is a wear-resistant, corrosion-resistant, and ductile material.
6. The subsea wellhead connector composite metal seal ring of claim 5, wherein: the corrosion-resistant alloy cushion layer (14) is made of Ni825 material.
7. The subsea wellhead connector composite metal seal ring of claim 1, wherein: the sealing ring body (1) is made of 316L.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110999283.5A CN113719252B (en) | 2021-08-28 | 2021-08-28 | Composite metal sealing ring of underwater wellhead connector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110999283.5A CN113719252B (en) | 2021-08-28 | 2021-08-28 | Composite metal sealing ring of underwater wellhead connector |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113719252A CN113719252A (en) | 2021-11-30 |
| CN113719252B true CN113719252B (en) | 2023-05-23 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110999283.5A Active CN113719252B (en) | 2021-08-28 | 2021-08-28 | Composite metal sealing ring of underwater wellhead connector |
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Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7025360B2 (en) * | 2002-09-25 | 2006-04-11 | Dril-Quip, Inc. | Metal seal with corrosion resistant alloy overlay |
| US20090102132A1 (en) * | 2007-10-17 | 2009-04-23 | Dril-Quip Inc. | External Pressure Gasket |
| US20100052261A1 (en) * | 2008-09-03 | 2010-03-04 | Salvador Maldonado | Metallic seal for use in highly-corrosive oil and gas environments |
| CN103591290B (en) * | 2013-11-14 | 2015-11-18 | 中国海洋石油总公司 | The composite seal ring improved |
| US9534689B2 (en) * | 2015-03-05 | 2017-01-03 | Fmc Technologies, Inc. | Metal seal ring |
| GB2584145A (en) * | 2019-05-23 | 2020-11-25 | Subsea Tech Limited | Gasket assembly and seal carrier |
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2021
- 2021-08-28 CN CN202110999283.5A patent/CN113719252B/en active Active
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| CN113719252A (en) | 2021-11-30 |
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