US20100052261A1 - Metallic seal for use in highly-corrosive oil and gas environments - Google Patents
Metallic seal for use in highly-corrosive oil and gas environments Download PDFInfo
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- US20100052261A1 US20100052261A1 US12/203,764 US20376408A US2010052261A1 US 20100052261 A1 US20100052261 A1 US 20100052261A1 US 20376408 A US20376408 A US 20376408A US 2010052261 A1 US2010052261 A1 US 2010052261A1
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- seal
- alloy
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- corrosion
- metal
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Links
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- 239000000956 alloy Substances 0.000 claims abstract description 86
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- 239000002184 metal Substances 0.000 claims abstract description 75
- 238000005260 corrosion Methods 0.000 claims abstract description 54
- 230000007797 corrosion Effects 0.000 claims abstract description 52
- 229910052715 tantalum Inorganic materials 0.000 claims abstract description 15
- GUVRBAGPIYLISA-UHFFFAOYSA-N tantalum atom Chemical compound [Ta] GUVRBAGPIYLISA-UHFFFAOYSA-N 0.000 claims abstract description 15
- 239000003870 refractory metal Substances 0.000 claims abstract description 7
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 28
- 238000000034 method Methods 0.000 claims description 12
- 229910000531 Co alloy Inorganic materials 0.000 claims description 8
- 229910052759 nickel Inorganic materials 0.000 claims description 8
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 claims description 7
- 229910000990 Ni alloy Inorganic materials 0.000 claims description 7
- 229910052750 molybdenum Inorganic materials 0.000 claims description 7
- 239000011733 molybdenum Substances 0.000 claims description 7
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 6
- 238000004519 manufacturing process Methods 0.000 claims description 6
- 239000010936 titanium Substances 0.000 claims description 6
- 229910052719 titanium Inorganic materials 0.000 claims description 6
- 229910017052 cobalt Inorganic materials 0.000 claims description 5
- 239000010941 cobalt Substances 0.000 claims description 5
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 claims description 5
- 229910000975 Carbon steel Inorganic materials 0.000 claims description 4
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims description 4
- 229910052804 chromium Inorganic materials 0.000 claims description 4
- 239000011651 chromium Substances 0.000 claims description 4
- 238000003754 machining Methods 0.000 claims 6
- 239000010953 base metal Substances 0.000 abstract description 6
- 239000000463 material Substances 0.000 description 13
- 238000005336 cracking Methods 0.000 description 12
- 239000003921 oil Substances 0.000 description 8
- 239000007789 gas Substances 0.000 description 7
- 238000007789 sealing Methods 0.000 description 7
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 description 6
- 229910000037 hydrogen sulfide Inorganic materials 0.000 description 6
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 4
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 4
- 229910001362 Ta alloys Inorganic materials 0.000 description 4
- 229910052739 hydrogen Inorganic materials 0.000 description 4
- 239000001257 hydrogen Substances 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 3
- 150000001805 chlorine compounds Chemical class 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 3
- 239000012530 fluid Substances 0.000 description 3
- 150000002739 metals Chemical class 0.000 description 3
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 3
- 229910052721 tungsten Inorganic materials 0.000 description 3
- 239000010937 tungsten Substances 0.000 description 3
- YZCKVEUIGOORGS-UHFFFAOYSA-N Hydrogen atom Chemical compound [H] YZCKVEUIGOORGS-UHFFFAOYSA-N 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- -1 UNS N07718 Chemical compound 0.000 description 2
- 229910002092 carbon dioxide Inorganic materials 0.000 description 2
- 239000001569 carbon dioxide Substances 0.000 description 2
- 235000009508 confectionery Nutrition 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
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- 229910052702 rhenium Inorganic materials 0.000 description 2
- WUAPFZMCVAUBPE-UHFFFAOYSA-N rhenium atom Chemical compound [Re] WUAPFZMCVAUBPE-UHFFFAOYSA-N 0.000 description 2
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- 241000191291 Abies alba Species 0.000 description 1
- 241000282472 Canis lupus familiaris Species 0.000 description 1
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- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000010349 cathodic reaction Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 229910052976 metal sulfide Inorganic materials 0.000 description 1
- VUZPPFZMUPKLLV-UHFFFAOYSA-N methane;hydrate Chemical compound C.O VUZPPFZMUPKLLV-UHFFFAOYSA-N 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 229910052758 niobium Inorganic materials 0.000 description 1
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 239000003209 petroleum derivative Substances 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 229920001169 thermoplastic Polymers 0.000 description 1
- 239000004416 thermosoftening plastic Substances 0.000 description 1
- 150000003568 thioethers Chemical class 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 229910001868 water Inorganic materials 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/02—Sealings between relatively-stationary surfaces
- F16J15/06—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces
- F16J15/08—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces with exclusively metal packing
- F16J15/0881—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces with exclusively metal packing the sealing effect being obtained by plastic deformation of the packing
-
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/02—Sealings between relatively-stationary surfaces
- F16J15/06—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces
- F16J15/08—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces with exclusively metal packing
- F16J15/0818—Flat gaskets
- F16J15/0825—Flat gaskets laminated
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/16—Sealings between relatively-moving surfaces
- F16J15/26—Sealings between relatively-moving surfaces with stuffing-boxes for rigid sealing rings
- F16J15/28—Sealings between relatively-moving surfaces with stuffing-boxes for rigid sealing rings with sealing rings made of metal
-
- 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
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/4998—Combined manufacture including applying or shaping of fluent material
- Y10T29/49982—Coating
- Y10T29/49986—Subsequent to metal working
Definitions
- the invention relates generally to metallic seal assemblies for use in sealing components of oil and gas wells.
- the invention relates to a seal assembly for use in a highly-corrosive well environment, such as a well having high levels of hydrogen sulfide, carbon dioxide, water, and chlorides.
- Oil and gas wells may contain many substances that combine together to create a highly-corrosive environment for oil field equipment.
- a seal that is used in a highly-corrosive environment that is not able to withstand the corrosive effects of the environment will begin to corrode. Eventually, the integrity of the seal will be lost and the seal assembly will fail.
- Wells are generally categorized as being either “sweet” or “sour.” A well is categorized as a sweet well if it is only mildly corrosive. Conversely, a well is categorized as a sour well if it is very corrosive. The presence of several different compounds can make a well a sour well, such as hydrogen sulfide, carbon dioxide, chlorides, and free sulfur.
- SCC stress corrosion cracking
- SSC Sulfide stress cracking
- SSCC sulfide stress corrosion cracking
- Susceptible alloys especially steels, react with hydrogen sulfide, forming metal sulfides and elementary atomic hydrogen.
- Atomic hydrogen created as a by-product of a cathodic reaction in the presence of H 2 S, diffuses into the metal matrix.
- Small quantities of hydrogen present inside certain metallic materials make the latter brittle and susceptible to sub-critical crack growth under stress. Some materials may exhibit a marked decrease in their load carrying capacity and fail in a brittle fashion when stressed in an atmosphere containing hydrogen. Both of these processes may be called hydrogen embrittlement.
- the materials used in the wells typically are selected based on their corrosion-resistance and strength, as well as cost-effectiveness.
- a technique is provided for sealing components located in highly corrosive environments, such as sour wells operating at high temperatures and pressures.
- a seal assembly is used to form a seal between components.
- the seal assembly is comprised of a base metal structure with a softer metal layer over the base metal structure.
- the purpose of the soft metal layer is to deform and, thereby, form a seal against a surface of an opposing component.
- the material of the base metal structure is chosen to provide structural integrity to the seal. Ideally, both materials should be selected to be compatible with the corrosive fluids.
- the base metal structure of the seal is comprised of a corrosion-resistant alloy.
- a corrosion-resistant alloy examples of some corrosion resistant alloys commonly used in the oil and gas industry are nickel and cobalt alloys, such as UNS N07718, UNS N07716, UNS N07725, UNS N09925, UNS R30006 and UNS R31233.
- the metal layer also is comprised of a corrosion-resistant alloy or metal, such as titanium, or a refractory metal, such as tungsten, molybdenum, rhenium and more specifically, tantalum.
- FIG. 1 is a cross-sectional view of a seal disposed between a wellhead and a wellhead connector, in accordance with an exemplary embodiment of the present technique
- FIG. 1A is a detailed cross-sectional view taken generally along line 1 A- 1 A of FIG. 1 , in accordance with an exemplary embodiment of the present technique;
- FIG. 2 is a cross-sectional view of a seal disposed between a casing hanger and a wellhead, in accordance with an exemplary embodiment of the present technique
- FIG. 3 is a cross-sectional view of the seal of FIG. 2 activated to form a seal between the casing hanger and the wellhead, in accordance with an exemplary embodiment of the present technique;
- FIG. 3A is a detailed cross-sectional view taken generally along line 3 A- 3 A of FIG. 3 , in accordance with an exemplary embodiment of the present technique;
- FIG. 4 is a cross-sectional view of a seal assembly for a swivel device, in accordance with an exemplary embodiment of the present technique.
- FIG. 4A is a detailed cross-sectional view taken generally along line 4 A- 4 A of FIG. 4 , in accordance with an exemplary embodiment of the present technique.
- the wellhead connector 24 is used to connect an object, such as a subsurface tree, to the high pressure wellhead 22 .
- the wellhead connector 24 has a lower portion (not shown) that is disposed over the exterior of the wellhead 22 .
- the wellhead connector 24 has a locking member, such as dogs (not shown) that are moved into engagement with grooves (not shown) formed on the exterior of the wellhead 22 .
- the high pressure wellhead has an inner bore 26 that is coaxial with an inner bore 28 of the wellhead connector 24 when the wellhead connector 24 is secured to the wellhead 22 .
- a gasket or seal ring 30 is disposed between the high pressure wellhead 22 and wellhead connector 24 to seal the inner bore 26 of the wellhead 22 to the inner bore 28 of the wellhead connector 28 .
- Seal ring 30 is generally T-shaped and has an upper leg 32 and a lower leg 34 .
- the upper leg 32 and lower leg 34 are symmetrical.
- the upper leg 32 and lower leg 34 may be asymmetrical.
- each leg has a first seal band 36 and a second seal band 38 .
- the seal ring 30 is formed so that the first and second seal bands 36 , 38 have a conical shape in this embodiment.
- the seal ring 30 has a rib 44 that is received into a recess 46 of the wellhead connector 24 .
- the recess 46 forms a pocket between the wellhead connector 24 and a shoulder 48 of the wellhead 22 .
- the seal ring 30 is manufactured to be resistant to sulfide stress cracking (SSC) and stress corrosion cracking (SCC).
- SSC sulfide stress cracking
- SCC stress corrosion cracking
- the seal ring 30 is manufactured to satisfy the requirements for “HH-Sour Service” as set forth in ANSI/API (Approved American National Standard/American Petroleum Institute) Specification 6A, “Specification for Wellhead and Christmas Tree Equipment.”
- a material satisfies the requirements for “HH-Sour Service” if it is a CRA (Corrosion Resistant Alloy) in compliance with NACE (National Association of Corrosion Engineers) standard: “MR 0175.”
- Section 3.1.30 of ANSI/API Specification 6A defines a Corrosion Resistant Alloy (CRA) as a “nonferrous-based alloy in which any one or the sum of the specified amount of the elements titanium, nickel, cobalt, chromium, and molybdenum exceed
- the seal ring 30 is comprised of a metal body 50 that is covered with a metal layer 52 .
- the metal body 50 comprises a corrosion-resistant alloy (CRA). Corrosion resistant alloys are well suited for service in extreme environments. These alloys form a thick and stable oxide layer on their surface protecting the alloy from the corrosive environment.
- the metal body 50 may be comprised of a metal other than a CRA.
- Examples of corrosion resistant alloys that may be used for the metal body 50 are nickel and cobalt alloys such as UNS N07718, UNS N07725, UNS N09925, UNS R30006 and UNS R31233.
- UNS N07718, UNS N07716, UNS N07725 and UNS N09925 are generally classified as precipitation-hardenable nickel alloys.
- UNS R30006 and UNS R31233 are generally categorized as cobalt based alloys.
- These nickel and cobalt alloys and others are intentionally alloyed and heat treated to provide the corrosion resistance and strength.
- the combination of elements makes the alloy resistant to hydrogen embrittlement and stress-corrosion cracking. These alloys are resistance to general corrosion, pitting, crevice corrosion, and stress-corrosion cracking in many aqueous environments, including sulfides and chlorides. However, an alloy other than the aforementioned alloys may be used.
- Alloys UNS N07718, UNS N07716, UNS N07725, UNS N09925, and UNS R31233 are listed in Annex A of Part 3 of NACE MR 0175 as CRAs.
- Part 3 of NACE MR 0175 is entitled: “Cracking-resistant CRAs (corrosion-resistant alloys) and other alloys.”
- Annex A is entitled: “Environmental cracking-resistant CRAs and other alloys.”
- Precipitation-hardened nickel-based alloys that are CRAs and their environmental and material limits are listed in Section A.9 of Annex A by their UNS number.
- UNS N07718, N09925 are listed in Tables A.31 and A.32, while UNS N07725 is listed in Table A.33 and UNS R31233 in Table A.38 of Annex A.
- Other CRAs not listed in these industry standards have been successfully and extensively used in oil and gas production fluids containing hydrogen sulfide, such as UNS R30006.
- the metal body 50 in the illustrated embodiment is covered with a metal layer 52 .
- the metal layer 52 comprises an alloy, preferably a metal such as a refractory metal.
- Refractory metals are a class of metals extraordinarily resistant to heat, wear, and corrosion.
- the five refractory metals are: Tungsten (W), Molybdenum (Mo), Niobium (Nb), Tantalum (Ta), and Rhenium (Re).
- W Tungsten
- Mo Mo
- Ta Tantalum
- Rhenium Rhenium
- the metal layer 52 is comprised of tantalum. Tantalum is one of the most corrosion resistant substances available. However, a different refractory metal may be used.
- the metal layer 52 has a greater ductility than the metal body 50 .
- the metal layer 52 is provided to form a seal against an opposing seal surface and the metal body 50 is provided to supply structural integrity and strength for the metal layer 52 .
- the metal layer 52 is disposed over the entire surface of the seal ring 30 in the illustrated embodiment. However, the metal layer 52 may be disposed over less than the entire surface of the seal ring 30 . For example, in an alternative embodiment, the metal layer 52 may be disposed only over a sealing surface or sealing surfaces.
- the metal layer 52 is a tantalum alloy, such as the tantalum alloy corresponding to UNS No. R05200. Tantalum alloy R05200 is listed in Table A.42 of Annex A of NACE MR 0175 as a CRA. The environmental and material limits for alloy R05200 are provided in Table A.42, as well. As illustrated in FIG. 5 , Table D.12 from Annex D of Part 3 of NACE MR 0175 provides the chemical composition of alloy R05200. The alloy is comprised of small amounts of carbon, cobalt, iron, silicon, molybdenum, tungsten, nickel, and titanium, and other elements with the remainder tantalum. However, unalloyed tantalum or another tantalum alloy may be used, such as an alloy corresponding to UNS No. R05210.
- FIGS. 2 , 3 , and 3 A another portion of the wellhead assembly 20 is presented.
- a seal assembly 54 is provided to seal an annulus 56 between the wellhead 22 and a casing hanger 58 .
- the casing hanger 58 is used to support a string of casing (not shown) from the wellhead 22 .
- the illustrated embodiment of the seal assembly 54 comprises a seal ring 60 and an energizing ring 62 .
- the seal ring 60 is provided to form a seal with the high pressure wellhead 22 on one side and the casing hanger 58 on the other side, thereby sealing the annulus 56 between the wellhead 22 and the casing hanger 58 .
- the energizing ring 62 is used to activate the seal ring 60 .
- the seal ring 60 has an inner leg 64 and an outer leg 66 with a slot 68 between them.
- the seal ring 60 has a metal body 70 with a metal layer 72 disposed over the surface of the metal body 70 in the illustrated embodiment.
- the metal layer 72 comprises tantalum.
- the energizing ring 62 may also be comprised of a metal body with a metal layer disposed over the surface.
- the metal layer 72 is used to form a seal and the metal body 70 is provided to support the metal layer 72 .
- the metal layer 72 forms a seal with the wellhead 22 and with the casing hanger 58 .
- the high pressure wellhead 22 and the casing hanger 58 have wickers 74 , 76 , respectively, formed therein.
- the metal layer 72 is softer than the metal body 70 and is deformed into the wickers 74 , 76 forming a seal.
- the metal body 70 of the illustrated seal assembly 54 is formed of a corrosion-resistant alloy (CRA), such as a nickel or cobalt alloy.
- the energizing ring 62 may also comprise a corrosion-resistant alloy (CRA).
- a swivel seal assembly is presented and represented generally by reference numeral 78 .
- the swivel seal 78 is provided to seal the annulus 80 between an inner member 82 and an outer member 84 .
- the inner member 82 and outer member 84 have several seal pads 86 that are used to form seals with the swivel seal assembly 78 .
- the seal assembly 78 has seal arms 88 that have seal surfaces 90 that are configured to form a seal against the seal pads 86 .
- the seal surfaces 90 have a metal layer 92 that is used to form the seal with the seal pads 86 .
- the metal layer 92 may be located on the seal pads 86 , rather than the seal surfaces 90 of the seal assembly 78 .
- the seal arms 88 are comprised of a corrosion-resistant material, such as a nickel or cobalt alloy.
- the metal layer 92 also is comprised of a corrosion-resistant material.
- the illustrated embodiment of the metal layer 92 can be comprised of tantalum.
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Abstract
A metal seal assembly to seal components in highly corrosive environments, such as a sour well environment. The seal assembly is comprised of a base metal structural component with a softer metal layer applied onto its surface. The purpose of the soft metal layer is to locally deform and, thereby, form a seal against a surface of an opposing component. The base metal structure of the seal may be comprised of a corrosion-resistant alloy. In addition, the soft metal layer may be comprised of a corrosion-resistant alloy, such as a refractory metal like tantalum.
Description
- The invention relates generally to metallic seal assemblies for use in sealing components of oil and gas wells. In particular, the invention relates to a seal assembly for use in a highly-corrosive well environment, such as a well having high levels of hydrogen sulfide, carbon dioxide, water, and chlorides.
- Oil and gas wells may contain many substances that combine together to create a highly-corrosive environment for oil field equipment. A seal that is used in a highly-corrosive environment that is not able to withstand the corrosive effects of the environment will begin to corrode. Eventually, the integrity of the seal will be lost and the seal assembly will fail.
- Wells are generally categorized as being either “sweet” or “sour.” A well is categorized as a sweet well if it is only mildly corrosive. Conversely, a well is categorized as a sour well if it is very corrosive. The presence of several different compounds can make a well a sour well, such as hydrogen sulfide, carbon dioxide, chlorides, and free sulfur.
- In particular, equipment exposed to corrosive well bore fluids must be able to resist stress corrosion cracking (SCC). Stress corrosion cracking (SCC) is the unexpected sudden failure of normally ductile metals or tough thermoplastics subjected to a constant tensile stress in a corrosive environment, especially at elevated temperature (in the case of metals). This type of corrosion often progresses rapidly. The corrosive environment is of crucial importance, and only very small concentrations of certain highly active chemicals are needed to produce catastrophic cracking, often leading to devastating failure.
- Sulfide stress cracking (SSC), or sulfide stress corrosion cracking (SSCC), is a form of stress corrosion cracking. Susceptible alloys, especially steels, react with hydrogen sulfide, forming metal sulfides and elementary atomic hydrogen. Atomic hydrogen, created as a by-product of a cathodic reaction in the presence of H2S, diffuses into the metal matrix. Small quantities of hydrogen present inside certain metallic materials make the latter brittle and susceptible to sub-critical crack growth under stress. Some materials may exhibit a marked decrease in their load carrying capacity and fail in a brittle fashion when stressed in an atmosphere containing hydrogen. Both of these processes may be called hydrogen embrittlement.
- As oil and gas wells are drilled in deeper and deeper waters, the demand on the materials used in the wells increases. In addition to being able to withstand the corrosive elements present in a well, the materials used must be able to withstand the greater temperatures and pressure requirements for wells drilled in ever deeper waters. As a result, the materials used within a corrosive well typically are selected based on their corrosion-resistance and strength, as well as cost-effectiveness.
- As a result, there is a need for a seal assembly that has the strength and corrosion-resistance to form and maintain a seal in the highly-corrosive environment of a deepwater oil or gas well. In particular, there is a need for a seal assembly that has the strength and corrosion-resistance to form and maintain a seal in a corrosive deepwater well, especially under high pressure and high temperature conditions.
- A technique is provided for sealing components located in highly corrosive environments, such as sour wells operating at high temperatures and pressures. A seal assembly is used to form a seal between components. The seal assembly is comprised of a base metal structure with a softer metal layer over the base metal structure. The purpose of the soft metal layer is to deform and, thereby, form a seal against a surface of an opposing component. The material of the base metal structure is chosen to provide structural integrity to the seal. Ideally, both materials should be selected to be compatible with the corrosive fluids.
- Preferably, the base metal structure of the seal is comprised of a corrosion-resistant alloy. Examples of some corrosion resistant alloys commonly used in the oil and gas industry are nickel and cobalt alloys, such as UNS N07718, UNS N07716, UNS N07725, UNS N09925, UNS R30006 and UNS R31233. In addition, preferably, the metal layer also is comprised of a corrosion-resistant alloy or metal, such as titanium, or a refractory metal, such as tungsten, molybdenum, rhenium and more specifically, tantalum.
- These and other features, aspects, and advantages of the present invention will become better understood when the following detailed description is read with reference to the accompanying drawings in which like characters represent like parts throughout the drawings, wherein:
-
FIG. 1 is a cross-sectional view of a seal disposed between a wellhead and a wellhead connector, in accordance with an exemplary embodiment of the present technique; -
FIG. 1A is a detailed cross-sectional view taken generally alongline 1A-1A ofFIG. 1 , in accordance with an exemplary embodiment of the present technique; -
FIG. 2 is a cross-sectional view of a seal disposed between a casing hanger and a wellhead, in accordance with an exemplary embodiment of the present technique; -
FIG. 3 is a cross-sectional view of the seal ofFIG. 2 activated to form a seal between the casing hanger and the wellhead, in accordance with an exemplary embodiment of the present technique; -
FIG. 3A is a detailed cross-sectional view taken generally alongline 3A-3A ofFIG. 3 , in accordance with an exemplary embodiment of the present technique; -
FIG. 4 is a cross-sectional view of a seal assembly for a swivel device, in accordance with an exemplary embodiment of the present technique; and -
FIG. 4A is a detailed cross-sectional view taken generally alongline 4A-4A ofFIG. 4 , in accordance with an exemplary embodiment of the present technique. - Referring generally to
FIGS. 1 and 1A , the present invention will be described as it might be applied in conjunction with an exemplary technique, in this case asubsea wellhead assembly 20 comprising ahigh pressure wellhead 22 and awellhead connector 24. Thewellhead connector 24 is used to connect an object, such as a subsurface tree, to thehigh pressure wellhead 22. Thewellhead connector 24 has a lower portion (not shown) that is disposed over the exterior of thewellhead 22. Thewellhead connector 24 has a locking member, such as dogs (not shown) that are moved into engagement with grooves (not shown) formed on the exterior of thewellhead 22. The high pressure wellhead has aninner bore 26 that is coaxial with aninner bore 28 of thewellhead connector 24 when thewellhead connector 24 is secured to thewellhead 22. - A gasket or
seal ring 30 is disposed between thehigh pressure wellhead 22 andwellhead connector 24 to seal theinner bore 26 of thewellhead 22 to theinner bore 28 of thewellhead connector 28.Seal ring 30 is generally T-shaped and has anupper leg 32 and alower leg 34. In this embodiment, theupper leg 32 andlower leg 34 are symmetrical. Alternatively, theupper leg 32 andlower leg 34 may be asymmetrical. In addition, in this embodiment, each leg has afirst seal band 36 and asecond seal band 38. In addition, theseal ring 30 is formed so that the first andsecond seal bands seal ring 30 to form a seal against aconical sealing surface 40 of thewellhead connector 24 and aconical sealing surface 42 of thehigh pressure wellhead 22. Theseal ring 30 has arib 44 that is received into arecess 46 of thewellhead connector 24. Therecess 46 forms a pocket between thewellhead connector 24 and ashoulder 48 of thewellhead 22. When thewellhead connector 24 is secured to thewellhead 22, therib 44 of theseal ring 30 is captured in therecess 46 between thewellhead 22 and thewellhead connector 24. - In the illustrated embodiment, the
seal ring 30 is manufactured to be resistant to sulfide stress cracking (SSC) and stress corrosion cracking (SCC). In particular, theseal ring 30 is manufactured to satisfy the requirements for “HH-Sour Service” as set forth in ANSI/API (Approved American National Standard/American Petroleum Institute) Specification 6A, “Specification for Wellhead and Christmas Tree Equipment.” According to Table 3 of ANSI/API Specification 6A, a material satisfies the requirements for “HH-Sour Service” if it is a CRA (Corrosion Resistant Alloy) in compliance with NACE (National Association of Corrosion Engineers) standard: “MR 0175.” Section 3.1.30 of ANSI/API Specification 6A defines a Corrosion Resistant Alloy (CRA) as a “nonferrous-based alloy in which any one or the sum of the specified amount of the elements titanium, nickel, cobalt, chromium, and molybdenum exceeds 50% (mass fraction).” NACE MR 0175 is entitled: “Petroleum and natural gas industries-Materials for use in H2S-containing environments in oil and gas production.” Section 3.6 of Part 1 of NACE MR 0175 defines a corrosion-resistant alloy (CRA) as an “alloy intended to be resistant to general and localized corrosion of oilfield environments that are corrosive to carbon steels.” Here, a corrosion-resistant alloy (CRA) is defined as a material that is “an alloy intended to be resistant to general and localized corrosion of oilfield environments that are corrosive to carbon steels” and/or “a nonferrous-based alloy in which any one or the sum of the specified amount of the elements titanium, nickel, cobalt, chromium, and molybdenum exceeds 50% (mass fraction).” - In the illustrated embodiment, the
seal ring 30 is comprised of ametal body 50 that is covered with ametal layer 52. In the illustrated embodiment, themetal body 50 comprises a corrosion-resistant alloy (CRA). Corrosion resistant alloys are well suited for service in extreme environments. These alloys form a thick and stable oxide layer on their surface protecting the alloy from the corrosive environment. However, themetal body 50 may be comprised of a metal other than a CRA. - Examples of corrosion resistant alloys that may be used for the
metal body 50 are nickel and cobalt alloys such as UNS N07718, UNS N07725, UNS N09925, UNS R30006 and UNS R31233. UNS N07718, UNS N07716, UNS N07725 and UNS N09925 are generally classified as precipitation-hardenable nickel alloys. UNS R30006 and UNS R31233 are generally categorized as cobalt based alloys. These nickel and cobalt alloys and others (not listed) are intentionally alloyed and heat treated to provide the corrosion resistance and strength. The combination of elements makes the alloy resistant to hydrogen embrittlement and stress-corrosion cracking. These alloys are resistance to general corrosion, pitting, crevice corrosion, and stress-corrosion cracking in many aqueous environments, including sulfides and chlorides. However, an alloy other than the aforementioned alloys may be used. - Alloys UNS N07718, UNS N07716, UNS N07725, UNS N09925, and UNS R31233 are listed in Annex A of Part 3 of NACE MR 0175 as CRAs. Part 3 of NACE MR 0175 is entitled: “Cracking-resistant CRAs (corrosion-resistant alloys) and other alloys.” Annex A is entitled: “Environmental cracking-resistant CRAs and other alloys.” Precipitation-hardened nickel-based alloys that are CRAs and their environmental and material limits are listed in Section A.9 of Annex A by their UNS number. UNS N07718, N09925 are listed in Tables A.31 and A.32, while UNS N07725 is listed in Table A.33 and UNS R31233 in Table A.38 of Annex A. Other CRAs not listed in these industry standards have been successfully and extensively used in oil and gas production fluids containing hydrogen sulfide, such as UNS R30006.
- As noted above, the
metal body 50 in the illustrated embodiment is covered with ametal layer 52. In the illustrated embodiment, themetal layer 52 comprises an alloy, preferably a metal such as a refractory metal. Refractory metals are a class of metals extraordinarily resistant to heat, wear, and corrosion. The five refractory metals are: Tungsten (W), Molybdenum (Mo), Niobium (Nb), Tantalum (Ta), and Rhenium (Re). Preferably, themetal layer 52 is comprised of tantalum. Tantalum is one of the most corrosion resistant substances available. However, a different refractory metal may be used. In the illustrated embodiment, themetal layer 52 has a greater ductility than themetal body 50. Themetal layer 52 is provided to form a seal against an opposing seal surface and themetal body 50 is provided to supply structural integrity and strength for themetal layer 52. In addition, themetal layer 52 is disposed over the entire surface of theseal ring 30 in the illustrated embodiment. However, themetal layer 52 may be disposed over less than the entire surface of theseal ring 30. For example, in an alternative embodiment, themetal layer 52 may be disposed only over a sealing surface or sealing surfaces. - In this embodiment, the
metal layer 52 is a tantalum alloy, such as the tantalum alloy corresponding to UNS No. R05200. Tantalum alloy R05200 is listed in Table A.42 of Annex A of NACE MR 0175 as a CRA. The environmental and material limits for alloy R05200 are provided in Table A.42, as well. As illustrated inFIG. 5 , Table D.12 from Annex D of Part 3 of NACE MR 0175 provides the chemical composition of alloy R05200. The alloy is comprised of small amounts of carbon, cobalt, iron, silicon, molybdenum, tungsten, nickel, and titanium, and other elements with the remainder tantalum. However, unalloyed tantalum or another tantalum alloy may be used, such as an alloy corresponding to UNS No. R05210. - Referring generally to
FIGS. 2 , 3, and 3A, another portion of thewellhead assembly 20 is presented. In this portion of the wellhead assembly, aseal assembly 54 is provided to seal anannulus 56 between thewellhead 22 and acasing hanger 58. Thecasing hanger 58 is used to support a string of casing (not shown) from thewellhead 22. - The illustrated embodiment of the
seal assembly 54 comprises aseal ring 60 and an energizingring 62. Theseal ring 60 is provided to form a seal with thehigh pressure wellhead 22 on one side and thecasing hanger 58 on the other side, thereby sealing theannulus 56 between thewellhead 22 and thecasing hanger 58. Once thecasing hanger 58 and theseal assembly 54 are in position within thehigh pressure wellhead 22, the energizingring 62 is used to activate theseal ring 60. Theseal ring 60 has aninner leg 64 and anouter leg 66 with aslot 68 between them. When the energizingring 62 is driven into theslot 68 of theseal ring 60, theinner leg 64 is driven against thecasing hanger 58 and theouter leg 66 is driven against thehigh pressure wellhead 22. - The
seal ring 60 has ametal body 70 with ametal layer 72 disposed over the surface of themetal body 70 in the illustrated embodiment. In the illustrated embodiment, themetal layer 72 comprises tantalum. The energizingring 62 may also be comprised of a metal body with a metal layer disposed over the surface. - As with the
seal assembly 30 above, themetal layer 72 is used to form a seal and themetal body 70 is provided to support themetal layer 72. When theinner leg 64 is driven against thecasing hanger 58 and theouter leg 66 is driven against thewellhead 22, themetal layer 72 forms a seal with thewellhead 22 and with thecasing hanger 58. In the illustrated embodiment, thehigh pressure wellhead 22 and thecasing hanger 58 havewickers metal layer 72 is softer than themetal body 70 and is deformed into thewickers metal body 70 of the illustratedseal assembly 54 is formed of a corrosion-resistant alloy (CRA), such as a nickel or cobalt alloy. The energizingring 62 may also comprise a corrosion-resistant alloy (CRA). - Referring generally to
FIGS. 4 and 4A , a swivel seal assembly is presented and represented generally byreference numeral 78. Theswivel seal 78 is provided to seal theannulus 80 between aninner member 82 and anouter member 84. In the illustrated embodiment, theinner member 82 andouter member 84 haveseveral seal pads 86 that are used to form seals with theswivel seal assembly 78. Theseal assembly 78 hasseal arms 88 that haveseal surfaces 90 that are configured to form a seal against theseal pads 86. In this embodiment, the seal surfaces 90 have ametal layer 92 that is used to form the seal with theseal pads 86. However, themetal layer 92 may be located on theseal pads 86, rather than the seal surfaces 90 of theseal assembly 78. In the illustrated embodiment, theseal arms 88 are comprised of a corrosion-resistant material, such as a nickel or cobalt alloy. In addition, themetal layer 92 also is comprised of a corrosion-resistant material. In particular, the illustrated embodiment of themetal layer 92 can be comprised of tantalum. - While only certain features of the invention have been illustrated and described herein, many modifications and changes will occur to those skilled in the art. It is, therefore, to be understood that the appended claims are intended to cover all such modifications and changes as fall within the true spirit of the invention.
Claims (32)
1. A seal assembly for a wellhead assembly, comprising:
a metal seal structural body having at least one surface area adapted to form a seal against an opposing surface; and
a metal layer disposed over at least one of the metal seal structural body or the opposing seal structure to form a metal-to-metal seal, wherein the metal layer comprises tantalum.
2. The seal assembly as recited in claim 1 , wherein the metal layer comprises an alloy corresponding to UNS (Unified Numbering System) R05200.
3. The seal assembly as recited in claim 1 , wherein the metal layer comprises an alloy corresponding to UNS (Unified Numbering System) R05210.
4. The seal assembly as recited in claim 1 , wherein the metal seal structural body comprises a corrosion-resistant alloy (CRA).
5. The seal assembly as recited in claim 4 , wherein the CRA is an alloy intended to be resistant to general and localized corrosion of oilfield environments that are corrosive to carbon steels.
6. The seal assembly as recited in claim 4 , wherein the CRA is a nonferrous-based alloy in which any one or the sum of the specified amount of the elements titanium, nickel, cobalt, chromium, and molybdenum exceeds 50% (mass fraction).
7. The seal assembly as recited in claim 6 , wherein the metal seal structural body comprises a precipitation-hardened nickel-based alloy.
8. The seal assembly as recited in claim 6 , wherein the metal seal structural body comprises an alloy corresponding to UNS (Unified Numbering System) alloy N07718.
9. The seal assembly as recited in claim 6 , wherein the metal seal structural body comprises an alloy corresponding to UNS (Unified Numbering System) alloy N07725.
10. The seal assembly as recited in claim 6 , wherein the metal seal structural body comprises an alloy corresponding to UNS (Unified Numbering System) alloy N07716.
11. The seal assembly as recited in claim 6 , wherein the metal seal structural body comprises an alloy corresponding to UNS (Unified Numbering System) alloy N09925.
12. The seal assembly as recited in claim 6 , wherein the metal seal structural body comprises a precipitation-hardened cobalt-based alloy.
13. The seal assembly as recited in claim 6 , wherein the metal seal structural body comprises an alloy corresponding to UNS (Unified Numbering System) alloy R31233.
14. The seal assembly as recited in claim 6 , wherein the metal seal structural body comprises an alloy corresponding to UNS (Unified Numbering System) alloy R30006.
15. A seal assembly for a wellhead assembly, comprising:
a metal seal structural body having at least one surface area adapted to form a seal against an opposing surface, wherein the metal body comprises a first corrosion-resistant alloy; and
a metal layer disposed over at least one of the at least one surface area adapted to form a seal against an opposing surface or the opposing surface, wherein the metal layer comprises a second corrosion-resistant alloy, the second corrosion-resistant alloy having a greater ductility than the first corrosion-resistant alloy.
16. The seal assembly as recited in claim 15 , wherein the second corrosion-resistant alloy comprises a refractory metal.
17. The seal assembly as recited in claim 16 , wherein the second corrosion-resistant alloy comprises tantalum.
18. The seal assembly as recited in claim 17 , wherein the second corrosion-resistant alloy comprises an alloy corresponding to UNS (Unified Numbering System) alloy R05200.
19. The seal assembly as recited in claim 17 , wherein the second corrosion-resistant alloy comprises an alloy corresponding to UNS (Unified Numbering System) alloy R05210.
20. The seal assembly as recited in claim 16 , wherein the first corrosion-resistant alloy is an alloy intended to be resistant to general and localized corrosion of oilfield environments that are corrosive to carbon steels.
21. The seal assembly as recited in claim 16 , wherein the first corrosion-resistant alloy is a nonferrous-based alloy in which any one or the sum of the specified amount of the elements titanium, nickel, cobalt, chromium, and molybdenum exceeds 50% (mass fraction).
22. The seal assembly as recited in claim 21 , wherein the first corrosion-resistant alloy comprises a precipitation-hardened nickel-based alloy.
23. The seal assembly as recited in claim 21 , wherein the metal seal structural body comprises an alloy corresponding to UNS (Unified Numbering System) alloy N07716.
24. The seal assembly as recited in claim 21 , wherein the metal seal structural body comprises an alloy corresponding to UNS (Unified Numbering System) alloy N07718.
25. The seal assembly as recited in claim 21 , wherein the metal seal structural body comprises an alloy corresponding to UNS (Unified Numbering System) alloy N07725.
26. The seal assembly as recited in claim 21 , wherein the metal seal structural body comprises an alloy corresponding to UNS (Unified Numbering System) alloy N09925.
27. A method of manufacturing a seal, comprising:
machining a metal to form a base seal structure having at least one surface configured to form a seal against an opposing surface; and
disposing a layer comprising tantalum over at least one of the at least one surface configured to form a seal against an opposing surface of the base seal structure or the opposing surface.
28. The method as recited in claim 27 , wherein disposing a layer comprising tantalum comprises disposing a layer of tantalum over the at least one surface configured to form a seal against an opposing surface.
29. The method as recited in claim 27 , wherein machining a metal to form a base seal structure having at least one surface configured to form a seal against an opposing surface comprises machining a corrosion-resistant alloy to form a base seal structure having at least one surface configured to form a seal against an opposing surface.
30. A method of manufacturing a seal, comprising:
machining a first corrosion-resistant alloy to form a base seal structure having at least one surface configured to form a seal against an opposing surface; and
disposing a layer of a second corrosion-resistant alloy having a greater ductility than the first corrosion-resistant alloy on at least one of the at least one surface configured to form a seal against an opposing surface of the base seal structure or the opposing surface.
31. The method of manufacturing a seal as recited in claim 30 , wherein disposing a layer of a second corrosion-resistant alloy having a greater ductility than the first corrosion-resistant alloy on the base seal structure comprises disposing a layer comprising tantalum on the at least one surface configured to form a seal against an opposing surface of the base seal structure or the opposing surface.
32. The method of manufacturing a seal as recited in claim 30 , wherein machining a first corrosion-resistant alloy to form a base seal structure having at least one surface configured to form a seal against an opposing surface comprises machining a nickel or cobalt-based alloy to form a base seal structure having at least one surface configured to form a seal against an opposing surface.
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
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US12/203,764 US20100052261A1 (en) | 2008-09-03 | 2008-09-03 | Metallic seal for use in highly-corrosive oil and gas environments |
GB0914821.4A GB2463144B (en) | 2008-09-03 | 2009-08-26 | Metallic seal for use in highly-corrosive oil and gas environments |
SG2012014858A SG179428A1 (en) | 2008-09-03 | 2009-09-01 | Metallic seal for use in highly- corrosive oil and gas environments |
SG200905806-6A SG159487A1 (en) | 2008-09-03 | 2009-09-01 | Metallic seal for use in highly-corrosive oil and gas environments |
BRPI0903269-0A BRPI0903269B1 (en) | 2008-09-03 | 2009-09-02 | SEAL ASSEMBLY FOR WELL HEAD ASSEMBLY AND METHOD OF MANUFACTURING A SEAL |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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US12/203,764 US20100052261A1 (en) | 2008-09-03 | 2008-09-03 | Metallic seal for use in highly-corrosive oil and gas environments |
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US20100052261A1 true US20100052261A1 (en) | 2010-03-04 |
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US12/203,764 Abandoned US20100052261A1 (en) | 2008-09-03 | 2008-09-03 | Metallic seal for use in highly-corrosive oil and gas environments |
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US (1) | US20100052261A1 (en) |
BR (1) | BRPI0903269B1 (en) |
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US20140131054A1 (en) * | 2012-11-15 | 2014-05-15 | Vetco Gray Inc. | Slotted metal seal |
US20140186207A1 (en) * | 2011-06-23 | 2014-07-03 | Industry-Academic Cooperation Foundation, Yonsei University | Alloy material in which are dispersed oxygen atoms and a metal element of oxide-particles, and production method for same |
CN105156672A (en) * | 2015-09-06 | 2015-12-16 | 宝鸡市渭滨区怡鑫金属加工厂 | High-performance titanium joint seal ring for deep-sea oil drilling and production equipment and processing method thereof |
US20160076328A1 (en) * | 2013-09-19 | 2016-03-17 | Vetco Gray Inc. | Seal With Soft Material Inlay |
CN113719252A (en) * | 2021-08-28 | 2021-11-30 | 中海石油(中国)有限公司湛江分公司 | Underwater well head connector combined type metal sealing ring |
US11713639B2 (en) * | 2020-01-21 | 2023-08-01 | Baker Hughes Oilfield Operations Llc | Pressure energized seal with groove profile |
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GB202106015D0 (en) * | 2021-04-27 | 2021-06-09 | Sub Drill Supply Ltd | Gasket apparatus and method of forming |
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US11066730B2 (en) * | 2011-06-23 | 2021-07-20 | Industry-Academic Cooperation Foundation, Yonsei University | Alloy material in which are dispersed oxygen atoms and a metal element of oxide-particles, and production method for same |
US20140186207A1 (en) * | 2011-06-23 | 2014-07-03 | Industry-Academic Cooperation Foundation, Yonsei University | Alloy material in which are dispersed oxygen atoms and a metal element of oxide-particles, and production method for same |
US20140131054A1 (en) * | 2012-11-15 | 2014-05-15 | Vetco Gray Inc. | Slotted metal seal |
US9169711B2 (en) * | 2012-11-15 | 2015-10-27 | Vetco Gray Inc. | Slotted metal seal |
US20160076328A1 (en) * | 2013-09-19 | 2016-03-17 | Vetco Gray Inc. | Seal With Soft Material Inlay |
CN105156672A (en) * | 2015-09-06 | 2015-12-16 | 宝鸡市渭滨区怡鑫金属加工厂 | High-performance titanium joint seal ring for deep-sea oil drilling and production equipment and processing method thereof |
US10851448B2 (en) | 2015-09-06 | 2020-12-01 | Baoji Yixin Metals Product Works | High performance titanium connecting sealing ring for deep-sea oil drilling and production device and processing method |
EP3346167B1 (en) * | 2015-09-06 | 2023-03-22 | Baoji Yixin Metals Product Works | Processing method for high performance titanium connecting sealing ring for deep-sea oil drilling and production device |
US11713639B2 (en) * | 2020-01-21 | 2023-08-01 | Baker Hughes Oilfield Operations Llc | Pressure energized seal with groove profile |
CN113719252A (en) * | 2021-08-28 | 2021-11-30 | 中海石油(中国)有限公司湛江分公司 | Underwater well head connector combined type metal sealing ring |
Also Published As
Publication number | Publication date |
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BRPI0903269A2 (en) | 2011-08-30 |
GB2463144A (en) | 2010-03-10 |
GB0914821D0 (en) | 2009-09-30 |
SG159487A1 (en) | 2010-03-30 |
BRPI0903269B1 (en) | 2020-10-06 |
SG179428A1 (en) | 2012-04-27 |
GB2463144B (en) | 2012-07-25 |
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