GB2217795A - Packoff seal - Google Patents
Packoff seal Download PDFInfo
- Publication number
- GB2217795A GB2217795A GB8830066A GB8830066A GB2217795A GB 2217795 A GB2217795 A GB 2217795A GB 8830066 A GB8830066 A GB 8830066A GB 8830066 A GB8830066 A GB 8830066A GB 2217795 A GB2217795 A GB 2217795A
- Authority
- GB
- United Kingdom
- Prior art keywords
- metal
- annular
- seal
- packoff
- lips
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 239000002184 metal Substances 0.000 claims abstract description 44
- 238000007789 sealing Methods 0.000 claims abstract description 18
- 238000005452 bending Methods 0.000 claims abstract description 8
- 230000009471 action Effects 0.000 claims abstract description 4
- 125000006850 spacer group Chemical group 0.000 claims description 6
- 230000004888 barrier function Effects 0.000 claims description 5
- 230000004044 response Effects 0.000 claims description 5
- 238000009434 installation Methods 0.000 claims description 2
- 229920001971 elastomer Polymers 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 230000000712 assembly Effects 0.000 description 7
- 238000000429 assembly Methods 0.000 description 7
- 238000000034 method Methods 0.000 description 4
- 230000000875 corresponding effect Effects 0.000 description 3
- 238000005553 drilling Methods 0.000 description 3
- 238000001125 extrusion Methods 0.000 description 3
- 239000007789 gas Substances 0.000 description 2
- 235000001674 Agaricus brunnescens Nutrition 0.000 description 1
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 230000002079 cooperative effect Effects 0.000 description 1
- 230000001627 detrimental effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 229910000037 hydrogen sulfide Inorganic materials 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 208000027765 speech disease Diseases 0.000 description 1
- 230000007480 spreading Effects 0.000 description 1
- 238000003892 spreading Methods 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/02—Surface sealing or packing
- E21B33/03—Well heads; Setting-up thereof
- E21B33/04—Casing heads; Suspending casings or tubings in well heads
-
- 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
- E21B2200/00—Special features related to earth drilling for obtaining oil, gas or water
- E21B2200/01—Sealings characterised by their shape
Landscapes
- Geology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- Physics & Mathematics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Gasket Seals (AREA)
- Pipe Accessories (AREA)
- Earth Drilling (AREA)
- Containers And Plastic Fillers For Packaging (AREA)
Abstract
A metal-to-metal packoff comprises a seal element 46 with a pair of annular metal sealing lips 52, 54 that are energized, i.e. expanded, into pressure-tight contact with opposed annular metal surfaces of, for example, a wellhead housing and an inner casing hanger by the wedging force of an annular expander mandrel 32a that has a cross-sectional configuration resembling that of a tuning fork with depending legs 72, 74. The legs, actually annular axial flanges, of the mandrel are radially compressed during that wedging-type seal energization action to result in production of bending energy in the legs as well as in the lips of the seal element, which energy maintains the seal lips in pressure-tight engagement with the opposed wellhead and hanger surfaces throughout wide variations in well pressures to which the seal element may be exposed. <IMAGE>
Description
PACKOFF SYSTEM
This invention relates to packof F systems for pressure sealing the annulus between adjacent concentric
tubular elements, such as a wellhead housing and a casing hanger in a subsea well, and more particularly to such packoff systems that provide a metal-to-metal seal between the elements.
BACKGROUND OF THE INVENTION
In the oil and gas industry, and especially in subsea or other underwater well drilling procedures, it is well established practice to employe an annular seal assembly, referred to as a packoff, between adjacent concentrate wellhead elements, such as the wellhead housing and the casing hangers that support the casing strings in the well, to pressure seal the annuli between these elements.For many years these packoffs have included elastomeric or other non-metallic annular seal elemerils that, when energized into tight contact with the opposed wellhead and hanger surfaces, provided the requisite pressure barrier. however, the growing trend towards drilling deep wells into relatively high pressure strata, and the frequent encountering in these wells of hydrogen sulfide or other corrosive gases, has led to the development of packoffs with all metal seal elements to establish a metal-to-metal pressure barrier.Although some of the known packoffs with metal. to-metal seals function satisfactorily under certaln conditlons, there is a. growing industry need for such packoffs that can be installed from a remote location without difficulty, that will withstand higher operating pressures than heretofore experlenced, and tht will maintain the seal throughout wide fluctuations ln pressure.
SUMMARY OF INVENTION
Broadly considered, the present invention comprises an improved metal-to-metal seal packoff system for establishing a high pressure metallic barrier between adjacent surfaces of concentric tubular elements, and especially for sealing the annulus between a wellhead housing and a casing hanger located concentrically therein, and for maintaining that metal pressure barrier or seal throughout relatively extreme pressure variations. 7he packoffs of this invention comprise assemblies of parts, including uniquely configured metal seal elements and seal energizers therefor, that cooperate in a novel manner to produce a significantly improved seal with considerably enhanced ability to withstand unusually high fluctuations in well pressures, that are relatively easy to assemble.
and that are capable of installation as an assembled unit into a subsea or other remotely locatd wellhead without compllcated procedures or other detrimental problems.
Teach of the below described and illustrated embodiments of a metal-to-metal packoff according to this invention comprises a seal element with a pair of annular metal sealing lips that are energized, i.e. expanded, into pressure-tight contact with opposed annular metal surfaces of, for example, a wellhead housing and an inner casing hanger by the wedging force of an annular expander mandrel that has a cross-sectional configuration resembling that of a tunlng fork with depending legs.The legs, actually annular axial flanges, of the mandrel are radlally compressed during that wedglng--type seal energization action to result in production of bending energy in the legs as well as in the lips of the seal element, which energy maintains the seal lips in pressure-tight engagement with the opposed wellhead and hanger surfaces throughout wide variations in well pressures to which the seal element may be exposed.Each of the described packoff seal embodiments is locked in a retracted, unenerglzed position while it is being run or otherwise placed in proper position in the wellhead, and activation to expand the metal seal lips into energized contact with the opposed surfaces of the wellhead and hanger cannot occur until purposefully performed by the operator through use of a packoff running tool.
Ihe metal-to-metal seals established by the packoffs of the invention are deslgned to be backed up by annular elastomeric seals to provide a secondary sealing function which is desirable under certain circumstances, and when so equipped the secondary elastomeric seal elements preferably are slightly larger in dlameter to provide a degree of protection of the metal seal lips during installatlon and other handling. Thus in tight-fitting locations the elastomeric seal elements can provide a primary or secondary seal between the welched and hanger independent of the seal provided by the metal seal element.
BRIEF DESCRIPTION OF JilE DRAWINGS
Fig. 1 is an isometric vlew of a subsea wellhead housing surrounding the upper ends of three concentric strings of well caslng, with the right half and upper portion of the left half of the drawing in vertical central section to show the packoff assemblies of the present invention installed between the housing and the casing hangers.
Fig. 2 is an enlarged fragmentary isometric vlew in vertical section of one of the packoff assemblies of
Fig. 1.
Fig. 3 is an enlarged fragmentary view in vertical section showing the packoff assembly of Figs. 1 and 2 in landed position between the wellhead housing and the adjacent casing hanger, but prior to setting it into functional metal-to-metal sealing condition.
Fig. 4 is a view like Fig. 3, showing the packoff set in its metal-to-metal sealing condition.
Figs. 5-7 are enlarged fragmentary views in vertical section illustrating additional embodiments of the metal seal element of a packoff assembly according to this invention.
DESCRIPTION OF THE PREFERRED EMBODIMENT
Fig. 1 illustrates a typical subsea wellhead system for suspending three casing strings at the seafloor, the system generally comprising an outer wellhead housing 10, first, second and third casing hangers 12, 14 and 16 for supporting outer, intermedyate and inner caslng strings 18, 20 and 22, respectively, in the housing 10, and first, second and third identical packoff assemblies 24, 26 and 28 for pressure sealing the annul between the housing 10 and the hangers 12, 14 and 16, respectively. As seen best in
Figs. 3 and 4, each of the annular packoff assemblies comprises a two. piece body having upper and lower components 30, 32 rotatably interconnected by threads 34, a lock ring 36 surrounding and carrled by the upper body component 30, an annular lock ring expander mandrel 38 also surrounding the upper body component 30 and retained on it
above the lock ring by a snap ring 40, that resides
partially in an inner groove 42 in the mandrel and around
an outer cylindrical surface 44 of the upper body 38, and an annular metal seal element 46 secured to the lower end
of the lower body component 32 by a plurallty of circumferentially spaced slud and nut retainers 48 (only one shown).Each of the packoff assemblies further
includes an anti-rotation ring 47 releasably secured to the upper body component 30 by a plurality of circumferentially spaced shear pins 49 (only one shown) to prevent relative rotation between the upper and lower body components 30, 32 until the packofr assembly is properly positioned and ready for energizing between the housing 10 and the hanger 14.
As shown best in Fig. 2, but also shown in Figs.
3 and 4, the preferred embodiment of the packoff's seal element 46 comprises an annular metal base portion 50 and a patr of annular metal sealing lips 52, 54 that extend upwardly in a relatively diverging or V-shaped manner from the base 50, a pair of annular elastomeric seals 56, 58 surrounding the outer surfaces of the sealing lips 52, 54, respectively, and a pair of annular wire-mesh or other suitable type of antf-extrusion rings 60,62. Ihe seal element 46 further includes a plurallty of segmented spacers 64 having a somewhat-tall, slender inverted mushroom shape in cross-sectional configuration, the spacers arranged circumferentially between the retalner studs 48.Each spacer 64 comprises a lower tapered base portion or head 66 that, in the assembled condition shown in the drawings, resides between the seal lips 52, 54, and a central web portion 68 that extends upwardly from the head 66 into a central annular space 70 defined by a palr of annular legs 72, 74 extending downwardly from the lower end portion 32a of the packoff lower body 32.
The annular legs 72, 74 of the packoff lower body 32 are dimensioned to fit tightly between the upper end portions 52a, 54a of the seal clement sealing llps 52, 54 as seen in Fiats. 2-4. and their lower outer surfaces are
taperedFat 72a, iXa to establish a wedge-like relationship with these lisps. Thus as the packoff lower body 32 is forced downwardly from its position shown in Fig. 3 into its Fig. 4 position by rotation of the upper body 38 during the setting procedure. the seal lips 52, 54 are mechanically wedged (spread) apart into pressure tight, metal-to-metal contact with the adjacent surfaces of the housing 10 and the hanger 14.During this seal lip spreading operation bending energy is imparted to the seal lips which functions to maintain them in positive, metal-to-metal contact with the wellhead and hanger over a wide range of well pressures and fluctuations thereof. The annular legs 72, 74 also incur some bending energy during this operatton, and the webs 68 of the spacers 64 prevent these legs from experiencing excessive permanent deformation when the well annulus pressure below the packoff pushes up on the seal element from the bottom.The legs 72, 74 will not, however, permanently yield due to loading but will retain some bending energy when subsequent low operating pressures are encountered thereby maintaining intact the metal-to-metal seal between the hanger and wellhead housing.
ATtON OF THE PACKOFF ASSEMBLY
Each packoff assembly 24, 26, 28 is installed in the welihead housing 10 by means of a running tool (not shown) attached to the lower end of a pipe string (not shown) that are controlled and manipulated from the surface drilling platform (not shown), a procedure generally well known in the industry. Referring to rigs. 3 and 4 for illustrative purposes, once the casing hanger 14 has been
lowered into position in the housing 10 and its casing string 20 has been cemented in place, the packoff assembly 26 Is lowered on the running tool and landed on the hanger as shown in Fig 3.In this position the packoff lower body 32 is locked against rotation by the cooperative action of an axial groove 14a tn the upper outer surface of the hanger 14 and a matting axial rib 32a on the adjacent inner surface of the body 32. Should the rib 32a not be in proper alignment with the groove 14a as the packoff is being lowered. the running tool is rotated by rotatton of the running string until the alignment is achieved and the landing step can continue.
The running tool is then rotated to the right, shearing pins (not shown) that releasably secure it to the packoff. As this rotation occurs the tool aligns with vertical shots eo (Fig. 1) in the packoff and drops further into it, forcing the expander mandrel 3a down behind the lock ring 36 which. in response, expands fully into its welihead housing groove 82, and causing the packoff anti-rotation ring z7 to shear the pins 49 and drop onto the upper end of the casing hanger 14 (Fig. 4) which thereby frees the packoff's upper body 30 to rotate.
The running tool is then further rotated to the right, causing corresponding right-hand rotation of the packoff's upper body 30. As this occurs the threads 34 between the upper body 30 and the lower body 32 cause these bodies to move in axial opposite directions, resulting in establishing a compressive force contained between the lock
ring 36 and the casting hanger 14. This compressive force
actuates the packoff seal element 46 to effect the desired metal-to-metal sealing engagement with the welihead housing
10 and the hanger 14. Low torque is sufficient to achieve
this seal element actuation, a highly desireable advantage with packoff assembles of the present invention.
REMOVAL OF THE PACKOFF ASSEMBLY
The packoff assemblies of this invention can be removed from their set position in the wellhead housing 10 (Fig. 4) by lifting the expander mandrel 38 from behind the lock ring 36, allowing the ring to contract out of the housing groove 82 into its rig. 3 position against the upper body surface. Thts releases the packoff from the housing, and frees it for withdrawal by merely lifting it vertically.
THE EMBODIMENTS Of FIGURES 5-7
Fig. 5 illustrates a modification of the packoff seal of rigs. l-4,wherein annular elastomeric seals 90, 92 with annular surface grooves 90a, 92a are employed with the metal seal element 46 in place of the elastomeric seals 56, 58 and the anti-extrusion rings 60, 62. Also, the spacers 93 of this embodiment do not include a central web as present in the preferred embodiment.
Fig. 6 illustrates another metal seal element 94 with sealing lips 96. 98 of slightly different configuration than the corresponding lips 52, 54 of the
Figs. 1-4 embodiment. This metal seal element 94 also includes o pair of relatively small annular ribs 100, 102 that project upwardly and outwardly from the base seal element 104, and annular elastomeric seals 106, 108 of an undulate surface configuration that reside between the lips and the ribs.In this embodiment, the lower outer surfaces of the seal nerg1zer portion 110 of the packoff lower body have radiused surfaces 112, 114 that bear against the inside surfaces of the legs 96, 98.
In the Fig. 7 embodiment the seallng lips 116, 118 of the uniquely shaped metal seal element 120 extend from near the outer edges of the elements base 122, and annular elastomeric seals 124, 126 with annular anti-extrusion rings 129, 130 are held captive between the ends of the lips and opposed shoulders 132, 134 on the seal energizes portion 136 of the packoff's lower body 138.
Even though the above described embodiments of
Figs. 5-7 differ in geometry from the preferred embodiment of Figs. 1-4, it should be understood that the several corresponding parts and surfaces of these further embodiments provide the same functions in response to the same energization as that of the preferred embodtment.
Claims (8)
1. An annular packoff for establishing a high pressure
metal barrier between adjacent surfaces of concentric
tubular elements, said packoff comprising an asseblv including: a) A two-piece annular bodv having an upper component rotatably interconnected to a lower component fr relative axial movement of the components in
opposite directions; b) A lock rin surrounding said upper component anc expandable therefrom;
c) An annular lock ring expander mandrel surrounding
said upper component above said lock ring. said
mandrel having means to expand said lock rin response to an axial force exerted thereon::
d) Anti-rotation means releasably secured to said
lower component for preventing undesired relative
rotation of said upper and lower components;
e) Annular metal seal means secured to said lower
component for establishing a metal-to-metal seal
between said concentric tubular elements said
seal means comprising an annular metal base having
a pair of annular metal sealing lips extending
upwardly therefrom: and
f) Enerazzer means extending from said lower
component into operational position between said lips. said energizer means comprisino a par of
annular legs for wedi said lips apart into pressure tight contact with said tubular eleven
surfaces ln response to an axial force exerted
thereon. said legs acquiring bending energy during
said wedging movement and applying said eneroy to
said lips to maintain said pressure tight
metal-to-metal contact thereof with said surfaces
over extreme fluctuations in pressure to which
said seal means is exposed.
2. A packoff according to claim 1 including spacer means
between said annular legs to prevent said legs from
deforming beyond acceptable limits in response to
wedging pressure exerted thereon.
3. A packoff according to calm I Including elastomeris
seal means located on said metal seal means to provide seccndary sealing function.
4. A packoff according to claim 1 wherein the sealing lips diverge from th base and also provide a retaining
function for annular non-metallic secondary seal
means.
5. A metal-to-metal packoff comprising a seal element with
a pair of annular metal sealing lips that, in use, are
expanded into pressure-tight contact with opposed annular metal surfaces by the wedging action of an
annular expander- mandrel having a cross-sectional
configuration resembling a turning fork with depending
legs, formed by annular coaxial flanges, which legs
are radially compressed during said wedging action
resulting in bending energy being stored in the legs
as well as in the seal lips; whereby said bending
energy can maintain the seal lips in pressure-tight
engagement with the opposed annular metal surfaces
throughout a wide variation in pressure to which the
seal element may be exposed.
6. A packoff as claimed in Claim 5 wherein the seal element
is acted up by annular elastomeric seals to provide
a secondary sealing function.
7. A packoff as claimed in Claim 6 wherein secondary
elastomeric seal elements are slightly larger in
diameter to protect the metal seal lips during
installation and other handling.
8. A packoff substantially as described with reference
to or as shown by Figs. 1 to 4, or Fig. 5, or Fig. 6,
or Fig. 7 of the drawings.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US18699388A | 1988-04-27 | 1988-04-27 |
Publications (3)
Publication Number | Publication Date |
---|---|
GB8830066D0 GB8830066D0 (en) | 1989-02-22 |
GB2217795A true GB2217795A (en) | 1989-11-01 |
GB2217795B GB2217795B (en) | 1992-01-15 |
Family
ID=22687176
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB8830066A Expired - Lifetime GB2217795B (en) | 1988-04-27 | 1988-12-23 | Pack off system |
Country Status (6)
Country | Link |
---|---|
BR (1) | BR8900381A (en) |
CA (1) | CA1318245C (en) |
FR (1) | FR2630776B1 (en) |
GB (1) | GB2217795B (en) |
MX (1) | MX171274B (en) |
NO (1) | NO301350B1 (en) |
Cited By (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2230803A (en) * | 1989-04-26 | 1990-10-31 | Vetco Gray Inc | Wellhead packoff seal |
EP0475557A1 (en) * | 1990-08-24 | 1992-03-18 | Cooper Cameron Corporation | Method of sealing a casing hanger in a wellhead |
EP0501630A2 (en) * | 1991-02-25 | 1992-09-02 | Cooper Cameron Corporation | Casing hanger seal assembly |
EP0552525A1 (en) * | 1992-01-22 | 1993-07-28 | Cooper Cameron Corporation | Hanger assembly |
GB2274477A (en) * | 1993-01-26 | 1994-07-27 | Vetco Gray Inc Abb | Positive lock-down for wellhead seal |
GB2355479A (en) * | 1999-10-20 | 2001-04-25 | Vetco Gray Inc Abb | Metal to metal casing seal assembly |
GB2381546A (en) * | 2001-10-31 | 2003-05-07 | Dril Quip Inc | A combined elastomeric and metal sealing system |
WO2011048005A2 (en) | 2009-10-20 | 2011-04-28 | Aker Subsea As | Metal seal |
US9140388B2 (en) | 2010-03-22 | 2015-09-22 | Fmc Technologies, Inc. | Bi-directional seal assembly |
US20230366287A1 (en) * | 2022-05-12 | 2023-11-16 | Welltec Oilfield Solutions Ag | Downhole sealing assembly |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US10954730B1 (en) | 2019-06-07 | 2021-03-23 | Qes Pressure Control Llc | Pressure control for gate-valve and hot-tap drilling systems |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4131287A (en) * | 1977-07-11 | 1978-12-26 | Exxon Production Research Company | Annular seal |
US4595053A (en) * | 1984-06-20 | 1986-06-17 | Hughes Tool Company | Metal-to-metal seal casing hanger |
US4665979A (en) * | 1985-09-06 | 1987-05-19 | Hughes Tool Company | Metal casing hanger seal with expansion slots |
-
1988
- 1988-12-23 NO NO885754A patent/NO301350B1/en unknown
- 1988-12-23 GB GB8830066A patent/GB2217795B/en not_active Expired - Lifetime
- 1988-12-23 CA CA000587002A patent/CA1318245C/en not_active Expired - Fee Related
- 1988-12-30 FR FR8817541A patent/FR2630776B1/en not_active Expired - Lifetime
-
1989
- 1989-01-06 MX MX014451A patent/MX171274B/en unknown
- 1989-01-30 BR BR898900381A patent/BR8900381A/en not_active IP Right Cessation
Cited By (21)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2230803A (en) * | 1989-04-26 | 1990-10-31 | Vetco Gray Inc | Wellhead packoff seal |
GB2230803B (en) * | 1989-04-26 | 1992-11-25 | Vetco Gray Inc | Packoff with flexible section for casing hanger |
EP0475557A1 (en) * | 1990-08-24 | 1992-03-18 | Cooper Cameron Corporation | Method of sealing a casing hanger in a wellhead |
EP0501630A2 (en) * | 1991-02-25 | 1992-09-02 | Cooper Cameron Corporation | Casing hanger seal assembly |
EP0501630A3 (en) * | 1991-02-25 | 1993-05-05 | Cooper Industries, Inc. | Casing hanger seal assembly |
EP0552525A1 (en) * | 1992-01-22 | 1993-07-28 | Cooper Cameron Corporation | Hanger assembly |
US5330002A (en) * | 1992-01-22 | 1994-07-19 | Cooper Industries, Inc. | Hanger assembly |
GB2274477A (en) * | 1993-01-26 | 1994-07-27 | Vetco Gray Inc Abb | Positive lock-down for wellhead seal |
GB2274477B (en) * | 1993-01-26 | 1995-10-18 | Vetco Gray Inc Abb | Positive lockdown for metal seal |
US6367558B1 (en) | 1999-10-20 | 2002-04-09 | Abb Vetco Gray Inc. | Metal-to-metal casing packoff |
GB2355479A (en) * | 1999-10-20 | 2001-04-25 | Vetco Gray Inc Abb | Metal to metal casing seal assembly |
GB2355479B (en) * | 1999-10-20 | 2003-08-27 | Vetco Gray Inc Abb | Casing packoff |
GB2381546A (en) * | 2001-10-31 | 2003-05-07 | Dril Quip Inc | A combined elastomeric and metal sealing system |
US6705615B2 (en) | 2001-10-31 | 2004-03-16 | Dril-Quip, Inc. | Sealing system and method |
GB2381546B (en) * | 2001-10-31 | 2005-03-23 | Dril Quip Inc | Sealing system and method |
WO2011048005A2 (en) | 2009-10-20 | 2011-04-28 | Aker Subsea As | Metal seal |
CN102549233A (en) * | 2009-10-20 | 2012-07-04 | 阿克海底公司 | Metal seal |
CN102549233B (en) * | 2009-10-20 | 2015-05-06 | 阿克海底公司 | Metal seal |
US9151133B2 (en) | 2009-10-20 | 2015-10-06 | Aker Subsea As | Metal seal |
US9140388B2 (en) | 2010-03-22 | 2015-09-22 | Fmc Technologies, Inc. | Bi-directional seal assembly |
US20230366287A1 (en) * | 2022-05-12 | 2023-11-16 | Welltec Oilfield Solutions Ag | Downhole sealing assembly |
Also Published As
Publication number | Publication date |
---|---|
CA1318245C (en) | 1993-05-25 |
FR2630776B1 (en) | 1992-10-30 |
FR2630776A1 (en) | 1989-11-03 |
GB2217795B (en) | 1992-01-15 |
NO885754D0 (en) | 1988-12-23 |
NO301350B1 (en) | 1997-10-13 |
BR8900381A (en) | 1990-03-01 |
NO885754L (en) | 1989-10-30 |
MX171274B (en) | 1993-10-15 |
GB8830066D0 (en) | 1989-02-22 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
732E | Amendments to the register in respect of changes of name or changes affecting rights (sect. 32/1977) | ||
PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 20051223 |