CN113882829A - Metal filling sealing ring containing auxiliary sealing - Google Patents
Metal filling sealing ring containing auxiliary sealing Download PDFInfo
- Publication number
- CN113882829A CN113882829A CN202110999270.8A CN202110999270A CN113882829A CN 113882829 A CN113882829 A CN 113882829A CN 202110999270 A CN202110999270 A CN 202110999270A CN 113882829 A CN113882829 A CN 113882829A
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- sealing
- seal
- metal
- sealing ring
- sealing surface
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- 238000007789 sealing Methods 0.000 title claims abstract description 175
- 239000002184 metal Substances 0.000 title claims abstract description 43
- 239000000945 filler Substances 0.000 claims description 21
- 239000000463 material Substances 0.000 claims description 13
- 229920000459 Nitrile rubber Polymers 0.000 claims description 4
- 238000005260 corrosion Methods 0.000 claims description 4
- 230000007797 corrosion Effects 0.000 claims description 4
- 238000012856 packing Methods 0.000 claims description 2
- 239000012530 fluid Substances 0.000 abstract description 6
- 238000004458 analytical method Methods 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 10
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000002035 prolonged effect Effects 0.000 description 3
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 241000191291 Abies alba Species 0.000 description 1
- 101100459319 Arabidopsis thaliana VIII-2 gene Proteins 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 239000013535 sea water Substances 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- 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
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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 provides a metal filling sealing ring with an auxiliary seal, which is used for sealing between a connector and a wellhead. The auxiliary sealing ring can seal a wellhead and a connector when the conical sealing surface fails and also can prevent external fluid from entering the interior, according to stress analysis, when the auxiliary sealing ring is subjected to fluid internal pressure under the working condition, the fluid internal pressure acts on the inner surface of the sealing ring, and finally force is transmitted to a sealing part to provide contact force for the sealing ring.
Description
Technical Field
The invention relates to the technical field of sealing rings, in particular to a metal filling sealing ring with auxiliary sealing.
Background
Due to the increasing exhaustion of oil and gas resources on land, the sea has become the target of oil and gas resource exploitation of various countries, while equipment for underwater oil and gas exploitation and production inevitably becomes a key technology which must be mastered in the ocean oil and gas resource exploitation, and at present, due to the monopoly of foreign underwater production equipment, professional equipment for deep sea operation in China still has a great gap with foreign advanced technologies. Moreover, the performance of the underwater sealing structure can directly affect the safety and reliability of the underwater wellhead connector, if the underwater sealing is invalid, the shutdown of underwater production and the repair of the sealing structure can be directly caused, and the leakage of the wellhead connector caused by stress concentration or sealing surface abrasion of the sealing ring of the existing wellhead connector endangers the safety of the whole underwater production system, so that the invention of the Christmas tree sealing ring with excellent sealing performance is very necessary.
The existing metal sealing ring is in a circular ring shape, so that the sealing surfaces are only the upper end surface and the lower end surface of the circular ring, and the leakage condition can occur under the condition that one end surface is failed.
Disclosure of Invention
The invention aims to provide a metal-filled sealing ring with an auxiliary seal, so as to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme:
a metal-filled seal ring with a secondary seal, comprising a seal ring body in the shape of an annulus, wherein:
the outer side of the sealing ring body is provided with an upper sealing surface, a lower sealing surface and a bulge part which is positioned at the central symmetry position of the upper sealing surface and the lower sealing surface, the inner sides of the upper sealing surface and the lower sealing surface are filled with metal fillers, and the upper side and the lower side of the bulge part are provided with auxiliary sealing rings.
Preferably, the upper sealing surface and the lower sealing surface are conical inclined surfaces, and the inclined surfaces of the upper sealing surface and the lower sealing surface form a splayed shape.
Preferably, the upper sealing surface and the lower sealing surface are both provided with grooves.
Preferably, the metal filler is filled in the groove.
Preferably, the metal filler is a wear-resistant, corrosion-resistant, and ductile material.
Preferably, the metal filler is a Ni825 material.
Preferably, the upper side and the lower side of the boss are provided with auxiliary sealing grooves, the auxiliary sealing rings are arranged in the auxiliary sealing grooves, the width of each auxiliary sealing ring is larger than the depth of each auxiliary sealing groove, and the auxiliary sealing rings are made of hydrogenated nitrile rubber.
Preferably, the inner side surface of the sealing ring body is arc-shaped.
Preferably, the material of the sealing ring body is 316L.
Compared with the prior art, the invention has the beneficial effects that:
the auxiliary sealing ring can seal a wellhead and a connector when the conical sealing surface fails and also can prevent external fluid from entering the interior, according to stress analysis, when the auxiliary sealing ring is subjected to fluid internal pressure under the working condition, the fluid internal pressure acts on the inner surface of the sealing ring, and finally force is transmitted to a sealing part to provide contact force for the sealing ring.
Drawings
FIG. 1 is a cross-sectional view of a seal ring body according to the present invention;
FIG. 2 is an exploded view of FIG. 1;
FIG. 3 is a schematic structural view of a seal ring body according to the present invention in use;
FIG. 4 is an equivalent stress diagram of a sealing ring body under a pre-tightening working condition;
FIG. 5 is an equivalent stress diagram of a filling part in a pre-tightening working condition;
FIG. 6 is a graph of the contact stress of the upper sealing surface under the pre-tightening condition;
FIG. 7 is a graph of contact stress of a lower sealing surface under a pre-tightening condition;
FIG. 8 is an equivalent stress diagram of the seal ring body under working conditions;
FIG. 9 is an equivalent stress diagram of a filling portion under working conditions;
FIG. 10 is a graph of upper seal face contact stress in operating conditions;
FIG. 11 is a graph of lower seal face contact stress in operating conditions;
FIG. 12 is a graph of the contact stress of the auxiliary seal ring on the upper side in the working condition;
fig. 13 is a graph of the contact stress of the auxiliary seal ring on the lower side in the working condition.
In the figure: 1 sealing washer body, 2 upper seal face, 3 lower seal face, 4 bellyings, 5 metal fillings, 6 auxiliary seal circle, 7 recesses, 8 auxiliary seal grooves, 9 medial surfaces, 10 connectors, 11 wellheads.
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.
Example (b):
referring to fig. 1 and fig. 2, the present invention provides a technical solution:
a metal-filled seal ring comprising a secondary seal, comprising a seal ring body 1 in the shape of an annulus, wherein:
the outside of sealing washer body 1 is equipped with sealed face 2, lower seal face 3 and the bellying 4 that is located sealed face 2 and the 3 centrosymmetric departments of lower seal face, and sealed face 2 and lower seal face 3 are the awl inclined plane, and the inclined plane of sealed face 2 and lower seal face 3 forms the splayed, and then sealed face 2 and lower seal face 3 can agree with well head 11 and connector 10 by sealed face mutually, the inboard packing of sealed face 2 and lower seal face 3 has metal filler 5, and the upper and lower both sides of bellying 4 are equipped with auxiliary seal 6.
Preferably, the upper sealing surface 2 and the lower sealing surface 3 are both provided with a groove 7, the bottoms of two end surfaces of the groove 7 are rounded, and the groove 7 is filled with the metal filler 5.
Preferably, the metal filler 5 is a wear-resistant, corrosion-resistant, and ductile material.
Preferably, the metal filler 5 is a Ni825 material.
Preferably, the upper side and the lower side of the boss 4 are both provided with auxiliary sealing grooves 8, the auxiliary sealing rings 6 are arranged in the auxiliary sealing grooves 8, the width of each auxiliary sealing ring 6 is larger than the depth of each auxiliary sealing groove 8, the auxiliary sealing rings 6 protrude from the auxiliary sealing grooves 8, the auxiliary sealing rings 6 are made of hydrogenated nitrile rubber, and therefore the auxiliary sealing rings 6 can be arranged to seal when the upper sealing surface 2 or the lower sealing surface 3 fails.
Preferably, the inner side surface 9 of the sealing ring body 1 is arc-shaped, so that the cross-sectional width of the sealing ring body 1 is approximately equal, and the stress of the sealing ring body 1 is uniformly improved, and the service life of the sealing ring body 1 is prolonged.
Preferably, the material of the sealing ring body 1 is 316L.
As shown in FIG. 3, the sealing ring provided by the invention can seal the joint of the connector 10 and the wellhead 11, because the sealing ring body 1 is annular, the sealing ring has a self-aligning function during installation, namely, the sealing ring is not eccentric during installation, because the upper sealing surface 2 and the lower sealing surface 3 are separated by the bulge part 4 on the sealing ring body 1 during the lowering process of the sealing ring body 1, the lower sealing surface 3 is contacted with the sealed surface of the wellhead 11, because the lower sealing surface 3 and the sealed surface of the wellhead 11 are both conical, the lower sealing surface can be well jointed, then the connector 10 is placed on the sealing ring body 1, and because the sealing surface and the sealed surface are both conical surfaces, the connector 10 can be jointed with the upper sealing surface 2 of the sealing ring body 1, then the sealing ring body 1 is applied with pretightening force, namely, the upper connector 10 continuously moves downwards, because the sealing surface is a conical surface, the seal ring body 1 is compressed in the radial and axial directions, and when the compression reaches a certain value, the metal filler 5 is plastically deformed to fill the minute recesses between the seal surfaces until a predetermined compression is applied. In the operating mode that uses, because the pressure action of oil gas is on sealing washer body 1, sealing washer body 1 can produce huge radial force and make the contact stress of sealing washer body 1 be greater than the pressure of oil gas, and then accomplish the sealing connection of connector 10 and well head 11. Because the ductile metal filler 5 is used in the invention, scratches can not be generated on the sealing surface during precompression, so that the corrosion of oil gas can be reduced, and the sealing time can be prolonged, and the inner side surface 9 of the sealing ring body 1 is designed into an arc shape, so that the widths of the sealing cross sections are approximately equal, and the stress of the sealing ring body 1 can be uniformly applied, so that the service life of the sealing ring body 1 can be prolonged.
Because a certain precompression amount is also given to the auxiliary sealing ring 6 during precompression, when the main seal does not fail, the auxiliary sealing ring 6 can prevent seawater from corroding the main sealing surface; when the primary seal fails, the connector 10 and wellhead 11 can also be sealed due to the sealing effect of the secondary seal 6.
Finite element simulation verification feasibility:
1) method for judging sealing performance
For metal seal sites:
the GB/T21412.7 specification states that: in the working condition, the sealing coefficient of the sealing object is 1.6 when the sealing object is liquid; the sealing coefficient of the gas to be sealed is 2.
The GB150-2010 specification states that: for the metal sealing ring, the sealing ring can be completely attached to the sealed surface only when the plastic deformation occurs at the sealing part, so that the leakage is prevented; in 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, and the pre-tightening specific pressure of the stainless steel sealing ring is 179.3 MPa; in the working condition, the maximum contact stress of the sealing ring is ensured to be larger than the product of the medium pressure and the sealing coefficient, and the sealing coefficient of the stainless steel sealing ring is 6.5.
By combining the two specifications, the method for judging the sealing performance of the sealing ring on the metal sealing part comprises the following steps: when the metal sealing part is in a pre-tightening working condition, plastic deformation needs to occur; the contact stress is more than 179.3MPa of sealing specific pressure when the sealing ring is pre-tightened; the contact stress is more than 6.5 times of medium pressure under the working condition.
For non-metallic seal sites:
it is generally believed that the maximum contact stress at the non-metallic seal area during operating conditions is greater than the media pressure to meet the sealing requirements.
2) Structural strength evaluation method
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 of the invention
The material of the sealing ring body 1 is 316L, and the allowable stress of the sealing ring body is 465 MPa; the material of the metal filler 5 is Ni825, the yield strength of the metal filler is 315MPa, and the tensile strength of the metal filler is 700 MPa; the auxiliary sealing ring 6 is made of hydrogenated nitrile rubber.
Fig. 4 is an equivalent stress diagram of the sealing ring body in the pre-tightening condition, and the maximum equivalent stress of the sealing ring body is 182.05MPa and is smaller than the allowable stress of 465MPa, so that the sealing ring body 1 is safe in the pre-tightening condition.
FIG. 5 is an equivalent stress diagram of a metal filling part in a pre-tightening working condition, wherein the maximum equivalent stress of the metal filling part is 228MPa, and the yield strength of the filler is 315MPa, which indicates that the filler is plastically deformed, namely, the sealing condition is achieved; since its tensile strength is 700MPa, the filling position is safe.
Fig. 6 and 7 are contact stress graphs of the upper sealing surface and the lower sealing surface in the pre-tightening working condition, and it can be known from the graphs that the maximum contact stress 223.3MPa and 224.16MPa above and below the sealing ring are both greater than the specific sealing pressure value 179.3MPa, which indicates that the sealing ring meets the sealing requirement in the pre-tightening working condition.
Fig. 8 is an equivalent stress diagram of the sealing ring body in the pre-tightening working condition in the working condition, and the maximum equivalent stress of the sealing ring body is 337.02MPa and is smaller than the allowable stress of the sealing ring body which is 465MPa, so that the sealing ring body is safe in the pre-tightening working condition.
FIG. 9 is an equivalent stress diagram of a metal filling part under working conditions, wherein the maximum equivalent stress of the metal filling part is 359.35MPa, and the yield strength of the filler is 315MPa, which indicates that the filler is plastically deformed, namely, the sealing condition is achieved; since its tensile strength is 700MPa, the filling position is safe.
Fig. 10 and 11 are contact stress diagrams of the upper sealing surface and the lower sealing surface under working conditions, and it can be known from the diagrams that the maximum contact stress above and below the sealing ring is 651.54MPa and 637.09MPa, and is greater than 6.5 times of medium pressure 448.5MPa, which indicates that the sealing ring meets the sealing requirement under the working conditions.
Fig. 12 and 13 are graphs of contact stresses of upper and lower auxiliary seal rings of a seal ring in working conditions, and it can be seen from the graphs that the maximum contact stresses of the auxiliary seal rings are 82.463MPa and 82.526MPa, which are both greater than the medium pressure 69MPa, respectively, indicating that the auxiliary seal can replace a filling part to realize sealing under the condition that the filling part fails.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (9)
1. The utility model provides a contain supplementary sealed metal packing sealing washer, includes that the shape is annular sealing washer body (1), its characterized in that:
the sealing ring is characterized in that an upper sealing surface (2), a lower sealing surface (3) and a bulge (4) which is positioned at the central symmetry position of the upper sealing surface (2) and the lower sealing surface (3) are arranged on the outer side of the sealing ring body (1), metal fillers (5) are filled in the inner sides of the upper sealing surface (2) and the lower sealing surface (3), and auxiliary sealing rings (6) are arranged on the upper side and the lower side of the bulge (4).
2. The metal-filled seal ring with a secondary seal of claim 1, wherein: the upper sealing surface (2) and the lower sealing surface (3) are conical inclined surfaces, and the inclined surfaces of the upper sealing surface (2) and the lower sealing surface (3) form a splayed shape.
3. The metal-filled seal ring with a secondary seal of claim 2, wherein: and grooves (7) are arranged on the upper sealing surface (2) and the lower sealing surface (3).
4. A metal-filled seal ring with a secondary seal according to claim 3, wherein: the metal filler (5) is filled in the groove (7).
5. The metal-filled seal ring with a secondary seal according to claim 4, wherein: the metal filler (5) is a wear-resistant, corrosion-resistant and ductile material.
6. The metal-filled seal ring with a secondary seal according to claim 5, wherein: the metal filler (5) is a Ni825 material.
7. The metal-filled seal ring with a secondary seal of claim 1, wherein: the upper and lower both sides of bellying (4) are equipped with and all are equipped with auxiliary seal groove (8), auxiliary seal circle (6) just set up in auxiliary seal groove (8), and the width of auxiliary seal circle (6) is greater than the degree of depth of auxiliary seal groove (8), the material of auxiliary seal circle (6) is hydrogenated nitrile rubber.
8. The metal-filled seal ring with a secondary seal of claim 1, wherein: the inner side surface (9) of the sealing ring body (1) is arc-shaped.
9. The metal-filled seal ring with a secondary seal of claim 1, wherein: the material of the sealing ring body (1) is 316L.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110999270.8A CN113882829A (en) | 2021-08-28 | 2021-08-28 | Metal filling sealing ring containing auxiliary sealing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110999270.8A CN113882829A (en) | 2021-08-28 | 2021-08-28 | Metal filling sealing ring containing auxiliary sealing |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113882829A true CN113882829A (en) | 2022-01-04 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110999270.8A Pending CN113882829A (en) | 2021-08-28 | 2021-08-28 | Metal filling sealing ring containing auxiliary sealing |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113882829A (en) |
Citations (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4519636A (en) * | 1982-10-20 | 1985-05-28 | Koomey, Inc. | Seal for an underwater connector |
| US20010001419A1 (en) * | 1998-10-05 | 2001-05-24 | Michael P. Hartmann | Wellhead housing seal assembly with backup feature |
| US20030000694A1 (en) * | 2001-06-29 | 2003-01-02 | Sweeney Thomas F. | Gasket with multiple sealing surfaces |
| US20080048443A1 (en) * | 2006-06-02 | 2008-02-28 | Sub-Drill Supply Limited | Bimetal bore seal |
| CN101625026A (en) * | 2008-07-08 | 2010-01-13 | 环球油田机械公司 | Resilient high pressure metal-to-metal seal and method |
| CN203114231U (en) * | 2012-12-28 | 2013-08-07 | 美钻能源科技(上海)有限公司 | Metal sealing ring |
| CN103925365A (en) * | 2014-04-24 | 2014-07-16 | 成都锦江电子系统工程有限公司 | Underwater rotating seal waterproofing device |
| US20160258534A1 (en) * | 2015-03-05 | 2016-09-08 | Fmc Technologies, Inc. | Metal seal ring |
| CN205780076U (en) * | 2016-05-27 | 2016-12-07 | 上海蓝梭电子科技有限公司 | A kind of cone-shaped seal structure plugging together position for underwater connector |
| US10704712B1 (en) * | 2015-12-17 | 2020-07-07 | Cameron International Corporation | External pressure CX gasket |
| US20210054932A1 (en) * | 2018-03-30 | 2021-02-25 | Nippon Pillar Packing Co., Ltd. | Gasket and flow passage connector structure |
| CN212775541U (en) * | 2020-07-01 | 2021-03-23 | 上海平泰橡胶制品有限公司 | Rubber sealing ring for connector joint of drinking water pipeline |
| GB202106015D0 (en) * | 2021-04-27 | 2021-06-09 | Sub Drill Supply Ltd | Gasket apparatus and method of forming |
| CN112943146A (en) * | 2021-03-19 | 2021-06-11 | 美钻能源科技(上海)有限公司 | Ultrahigh pressure wellhead metal annulus seal package |
-
2021
- 2021-08-28 CN CN202110999270.8A patent/CN113882829A/en active Pending
Patent Citations (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4519636A (en) * | 1982-10-20 | 1985-05-28 | Koomey, Inc. | Seal for an underwater connector |
| US20010001419A1 (en) * | 1998-10-05 | 2001-05-24 | Michael P. Hartmann | Wellhead housing seal assembly with backup feature |
| US20030000694A1 (en) * | 2001-06-29 | 2003-01-02 | Sweeney Thomas F. | Gasket with multiple sealing surfaces |
| US20080048443A1 (en) * | 2006-06-02 | 2008-02-28 | Sub-Drill Supply Limited | Bimetal bore seal |
| CN101625026A (en) * | 2008-07-08 | 2010-01-13 | 环球油田机械公司 | Resilient high pressure metal-to-metal seal and method |
| CN203114231U (en) * | 2012-12-28 | 2013-08-07 | 美钻能源科技(上海)有限公司 | Metal sealing ring |
| CN103925365A (en) * | 2014-04-24 | 2014-07-16 | 成都锦江电子系统工程有限公司 | Underwater rotating seal waterproofing device |
| US20160258534A1 (en) * | 2015-03-05 | 2016-09-08 | Fmc Technologies, Inc. | Metal seal ring |
| US10704712B1 (en) * | 2015-12-17 | 2020-07-07 | Cameron International Corporation | External pressure CX gasket |
| CN205780076U (en) * | 2016-05-27 | 2016-12-07 | 上海蓝梭电子科技有限公司 | A kind of cone-shaped seal structure plugging together position for underwater connector |
| US20210054932A1 (en) * | 2018-03-30 | 2021-02-25 | Nippon Pillar Packing Co., Ltd. | Gasket and flow passage connector structure |
| CN212775541U (en) * | 2020-07-01 | 2021-03-23 | 上海平泰橡胶制品有限公司 | Rubber sealing ring for connector joint of drinking water pipeline |
| CN112943146A (en) * | 2021-03-19 | 2021-06-11 | 美钻能源科技(上海)有限公司 | Ultrahigh pressure wellhead metal annulus seal package |
| GB202106015D0 (en) * | 2021-04-27 | 2021-06-09 | Sub Drill Supply Ltd | Gasket apparatus and method of forming |
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Application publication date: 20220104 |
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