GB2202283A - Seals - Google Patents
Seals Download PDFInfo
- Publication number
- GB2202283A GB2202283A GB08805085A GB8805085A GB2202283A GB 2202283 A GB2202283 A GB 2202283A GB 08805085 A GB08805085 A GB 08805085A GB 8805085 A GB8805085 A GB 8805085A GB 2202283 A GB2202283 A GB 2202283A
- Authority
- GB
- United Kingdom
- Prior art keywords
- seal
- seal member
- stacks
- assembly
- members
- 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 19
- 238000001125 extrusion Methods 0.000 claims abstract description 11
- 229920000642 polymer Polymers 0.000 claims abstract description 6
- BFKJFAAPBSQJPD-UHFFFAOYSA-N tetrafluoroethene Chemical group FC(F)=C(F)F BFKJFAAPBSQJPD-UHFFFAOYSA-N 0.000 claims abstract description 6
- 229920006169 Perfluoroelastomer Polymers 0.000 claims abstract description 5
- 238000007789 sealing Methods 0.000 claims description 15
- 230000000712 assembly Effects 0.000 claims description 9
- 238000000429 assembly Methods 0.000 claims description 9
- 230000006835 compression Effects 0.000 claims description 6
- 238000007906 compression Methods 0.000 claims description 6
- -1 polytetrafluoro- ethylene Polymers 0.000 claims description 6
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 6
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 6
- 230000013011 mating Effects 0.000 claims description 5
- 229940058401 polytetrafluoroethylene Drugs 0.000 claims 5
- 125000006850 spacer group Chemical group 0.000 abstract description 17
- 239000000126 substance Substances 0.000 abstract description 7
- 238000004519 manufacturing process Methods 0.000 abstract description 5
- 239000004809 Teflon Substances 0.000 description 17
- 229920006362 Teflon® Polymers 0.000 description 17
- 239000000463 material Substances 0.000 description 5
- 230000000254 damaging effect Effects 0.000 description 4
- 229920001971 elastomer Polymers 0.000 description 3
- 239000000806 elastomer Substances 0.000 description 3
- 239000012530 fluid Substances 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- 229920013632 Ryton Polymers 0.000 description 2
- 239000004736 Ryton® Substances 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 238000012856 packing Methods 0.000 description 2
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 description 1
- 229920001774 Perfluoroether Polymers 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000007334 copolymerization reaction Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000003292 diminished effect Effects 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 229910000037 hydrogen sulfide Inorganic materials 0.000 description 1
- 229910001026 inconel Inorganic materials 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003129 oil well Substances 0.000 description 1
- UJMWVICAENGCRF-UHFFFAOYSA-N oxygen difluoride Chemical class FOF UJMWVICAENGCRF-UHFFFAOYSA-N 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
Classifications
-
- 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
- F16J15/18—Sealings between relatively-moving surfaces with stuffing-boxes for elastic or plastic packings
- F16J15/184—Tightening mechanisms
- F16J15/185—Tightening mechanisms with continuous adjustment of the compression 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
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/12—Packers; Plugs
- E21B33/1208—Packers; Plugs characterised by the construction of the sealing or packing means
-
- 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
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/12—Packers; Plugs
- E21B33/1208—Packers; Plugs characterised by the construction of the sealing or packing means
- E21B33/1216—Anti-extrusion means, e.g. means to prevent cold flow of rubber 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
- E21B2200/00—Special features related to earth drilling for obtaining oil, gas or water
- E21B2200/01—Sealings characterised by their shape
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Mechanical Engineering (AREA)
- Gasket Seals (AREA)
Abstract
A series of seal stack 16, adapted to selectively sealingly engage an outer conduit (14) during completion and production operations in high pressure, high temperature oil/gas wells containing corrosive chemicals, is separated by retaining rings 22 secured to the inner conduit 12 of the device. Each seal stack includes five annular seal members. The outermost members are metal spacers 24, 26. Disposed between the metal spacers are seal members of a perfluoroelastomer 32, a polymer of tetrafluoroethylene 38, and a knitted metal mesh 44 which eliminates extrusion of the other seal members. Each of the seal members include mated chevron surfaces 36, 40 and 42, 48 which facilitate assembly of the seal stack while minimizing extrusion. <IMAGE>
Description
SEAL SYSTEM
Background of the Invention
I. Field of the Invention
This invention relates to a seal system for use in completion and production operations of oil and gas wells and, in particular, to a seal system which utilizes a series of seal stacks separated by fixed retaining rings and including seal members capable of withstanding high pressure chemical environments II. Description of the Prior Art
Seal systems have become 2 vital part of completion and production operations of oil and gas wells. However, damage to the seal system due to extreme temperatures and pressures can result in diminished performance and seal integrity. Seal failure is exacerbated by corrosive chemicals, such as hydrogen sulfide and methane, which are often found in certain wells.Such environments are co=ion when the drilling and completion operations are conducted in deep wells needed to retrieve remote mineral deposits. In order to successfully complete such deep wells, the seal system must be resistant to the damaging effects of the well environment as well as the physical stresses resulting from the completion and production operations.
Several prior art patents disclose well packing or sealing systems which utilize resilient annular seal members. Various configurations have been developed to withstand different wail environments. However, the seal system cf the prior art have not been totally suitable for use in wells having high temperatures and pressures and environments which expose the seal members to corrosive fluids. In an attempt to overcome these deficiencies, various elastomeric materials have been used in sealing systems exposed to such severe environments.
The most common of such elastomeric materials include polytetrafluoroethylene sold under the DuPont trademark
Teflon, and a perfluoroelastomer sold under the DuPont trademark Kalrez. Teflon seal members have been used as sealing or packing elements in subterranean oil well applications as well as for providing sealing engagement to cylindrical members in other applications. This is a result of the high degree of permanent set, cold flow and resistance to high temperatures and corrosive chemicals inherent to Teflon seal members making it highly attractive for use in certain hostile environments.
Similarly, Kalrez is characterized by high thermal stability and chemical resistance although Kalrez members have a greater degree of flexibility resulting in greater flow of material.
One such system utilizes a series of annular seal assemblies separated by rigid spacing members adapted to sealingly engage a packer apparatus. Each seal assembly includes at least one Kalrez seal and at least one Teflon seal. In order to minimize extrusion of these elastomeric seal members, seal members made of a polymer of polyphenolenesulphide (sold under the Phillips Petroleum trademark Ryton) are seated on opposite sides of the two innermost seal members. However, because each of the seal assemblies are separated by slidable spacing members, the compressive forces generated by the first seal assembly are transferred to subsequent sealing assemblies resulting in damage to the entire seal system.Thus, because the individual seal assemblies are not isolated from each other, the breakdown of one assembly can cause damage to the remaining seals resulting in a loss of seal integrity.
Another commercially available seal system incorporates seal assemblies comprising a Kalrez seal member, a Teflon seal member and a Ryton seal member flanked by metal spacer rings. Metal C-rings secured to the inner conduit are used to separate groups of oppositely disposed seal assemblies. However, as with other seal assemblies, the applied pressure is transmitted from one seal assembly to its adjacent assembly.
Moreover, the load causes the Kalrez seal to extrude over the metal spaces creating extreme frictional forces which can cause sticking of the system resulting in a failure to retrieve the seal system. In addition, the extrusion tended to destroy the elastomeric seal member preventing re-use.
Summary of the Present Invention
The present invention overcomes the disadvantages of the prior known sealing devices by providing a seal system which effectively withstands high pressure and temperature environments while maintaining full seal integrity.
The seal system according to the present invention comprises a series of six seal stacks adapted to selectively sealingly engage an outer well conduit. The seal stacks are carried on an inner conduit and are composed of five annular members separated by a fixed retaining ring in order to fully isolate each of the seal stacks. The seal stacks include outermost metal spacer rings which abut the fixed retaining rings. Disposed between the metal spacers is one seal member composed of
Kalrez, one seal member composed of Teflon, and a seal member made of knitted metal mesh. Both the Teflon and
Kalrez seal members have a substantially chevron shape while the knitted mesh seal has a lower concave surface to receive the convex upper surface of the Teflon seal.
Similarly, the lower metal spacer is provided with a convex upper surface which mates with the concave surface of the Kalrez ring. These mating surfaces facilitate assembly while improving the sealing capabilities of the seal unit.
The Kalrez and Teflon seal members maintain the sealing integrity of the device even in chemically corrosive, high temperature environments. The knitted mesh seal member prevents extrusion of the elastomeric seal members over the metal spacers while providing a greater degree of compression than the metal spacers.
Similarly, because the concave surface of the Kalrez member and the convex surface of the lower metal spacer are not perfectly mated, the Kalrez ring is allowed to deform without extruding over the spacers. In addition, by totally isolating the individual, redundant seal stacks, the seal stacks are isolated from possibly damaging compressive forces generated by the first seal stack while holding pressure.
Other objects, features, and advantages of the invention will be apparent from the following detailed description taken in connection with the accompanying drawings.
Brief Description of the Drawing
The present invention will be more fully understood by reference to the following detailed description of a preferred embodiment of the present invention when read in conjunction with the accompanying drawing, in which like reference characters refer to like parts throughout the views, and in which: EZEERE 1 is a perspective view, partially in section, of the seal system of the present invention disposed within a well conduit; and 'EaRE 2 is an enlarged portion of the seal system according to the present invention.
Detailed Description of a Preferred
Embodiment of the Present Invention Referring first to Fig. 1, there is shown a preferred embodiment of a seal assembly 10 of the present invention for selectively sealing the annular space between an inner conduit 12 carrying the seal assembly 10 and an outer conduit 14 disposed within a well bore. The seal assembly 10 is generally utilized during the completion or workover of an oil and gas well and is adapted to sustain seal integrity in high pressure, high temperature and chemically hostile well environments.
As shown in Fig. 1, the seal assembly 10 comprises a plurality of seal stacks 16 seated within an annular groove 18 formed in the inner conduit 12 and defined by retaining shoulders 20. The seal stacks 16 extend longitudinally within the groove 18 of the inner conduit 12 in order to provide a large sealing area. In a preferred embodiment of the present invention, the seal assembly 10 includes six longitudinally extending seal stacks 16 although the seal assembly 10 can include more or less of the seal stacks 16 depending upon the intended application of the seal assembly 10. Moreover, the individual seal stacks 16 may be identically orientated or, as preferred, half of the seal stacks 16 may be orientated in one direction while the remaining seal stacks 16 are orientated in the opposite direction.In this manner, compression of the seal assembly 10 results in oppositely directed compressive forces thereby ensuring complete sealing engagement.
The seal assembly 10 also includes at least one retaining ring 22 fixedly secured to the inner conduit 12.
The retaining rings 22 are seated within annular grooves 24 formed in the inner conduit 12 in order to prevent movement of the rings 22 upon compression of the seal stacks 16. In the embodiment illustrated in Fig. 1, retaining rings 22 are provided between similarly orientated adjacent seal stacks 16 in order to isolate the seal stacks 16 from possibly damaging compressive forces generated by the first or outermost seal stack 16 while holding pressure. Additionally, by providing isolation of the individual seal stacks 16, excessive extrusion and the resulting sticking of the seal assembly 10 within the seal bore is eliminated.However, because the outermost seal stacks absorb the greatest amount of compressive force, no retaining ring 22 is provided between the two innermost and oppositely orientated seal stacks thereby reducing manufacturing costs while permitting greater longitudinal freedom. It is to be understood, however, that a retaining ring 22 may be mounted between each pair of adjacent seal stacks 16 in order to provide total separation of the seal stacks 16 or only the outermost seal stacks 16 may be isolated from the other seals stacks 16 depending upon the particular application intended for the seal assembly 1C. ?::owever, at lees= one retaining rig 22 is provided in order to isolate the first seal stack 16 which is s'abject -to the greatest compressive forces.
Referring now to rig. 2, the individual seal stacks 16 comprise a plurality of annular seal members in a sequential layered arrangement. The outer pair of seel members 24 and 26 of the seal stack 16 ere rigid metal spacers which are adjacent to the retaining rings 22 disposed between the seal stacks 16. Of course, in the embodiment of Fig. 1, the spacer 26 engages the delimiting shoulders 20 of the groove 18 while spacers 24 abut each other when no retaining ring 22 is utilized between the innermost, oppositely orientated seal stacks 16. As shown in Fig. 2, the metal spacing member 26 has a substantially rectangular cross-sectional configuration.In contrast, the other spacer 24 has an outer substantially planar surface 28 adapted to cooperate with the adjacent retaining ring 22 and a substantially convex inner surface 30 adapted to cooperate with the adjacent seal member as will be hereinafter described.
Adjacent the convex surface 30 of the spacing member 24 is a perfluoroelastomer seal member 32 which is generally chevron-shaped in cross-section. The seal member 32 is made from an elastomer formed from the copolymerization reaction product of tetrafluoroethylene and perfluoro ethers. The elastomer provides outstanding chemical and fluid resistance under high temperature conditions and is commercially available under the trademark Kalrez from DuPont and Company. An example of such an elastomer is described and defined in r.s. Patent
No. 3,682,872 which is incorporated herein by reference.
-he elastomeric seal member 32 includes 2 substantially concave outer (or upper, as shown n Fig. 2) surface 39 and a substantially convex inner (or lower) surface 36, both of which have substantially identical curvatures.
The concave surface 34 of the seal member 32 is adapted to receive or mate with the convex surface 30 of the spacing member 24. However, the angle normally formed by the concave surface 34 of the seal member 32 is normally greater than the angle formed by the convex surface 30 of the spacing member 24 such that the concave surface 34 diverges from the convex surface 30 while the seal stack 16 is in its normal at-rest state. The mating engagement of the convex surface 30 of the spacing member 24 within the concave surface 34 increases as compress ion of the seal stack 16 occurs.In this manner, extrusion of the
Kalrez seal member 32 over the spacing member 24 is eliminated because of the flow back space provided between the Kalrez seal 32 and the spacer 24.
Adjacent the Kalrez seal member 32 is a seal member 38 formed of a polymer of tetrafluoroethylene commercially available under the trademark Teflon from DuPont and
Company. The Teflon seal member 38 is well suited for the present application because it is a flexible material having a high degree of permanent set and cold flow yet is highly resistant to high temperatures and corrosive chemicals. The Teflon seal member 38 has a substantially chevron-type cross-section with an outer (or upper) concave surface 40 and an inner (or lower) convex surface 42. The concave surface 40 of the Teflon seal member 38 is adapted to receive and mate with the convex surface 36 of the Kalrez member 32.
Finally, adjacent the Teflon seal 38 and abutting the spacing member 26 is an inconel knitted mesh seal member 44 which is adapted to reduce extrusion of not only the Teflon seal member 38 bSt also the Kalrez seal 32. The compressible knitted mesh seal member 44 comprises a planar srfa-,e 56 adapted to engage and abut the rectangular spacing member 26 and a second substantially concave surface 48. The concave surface 48 of the mesh seal member 44 is adapted to matingly receive the convex surface 42 of t the Teflon seal member 38.In the preferred embodiment of the present invention, the seal member 44 is constructed cf a metal mesh which upon coy session of the seal stack 16, will compress to form a substantially solid back-up seal member.
Thus, the seal assembly 10 of the present invention utilizes a series of cooperating seal members 24, 26, 32, 38 and 44 such that the resilient forces produced during compression of the seal stacks provides a tight fluid seal. The seal members have cooperating chevron surfaces to enhance the sealing engagement therebetween. In addition, by arranging the seal assembly 10 such that three of the seal stacks 16 are orientated upwardly and three seal stacks 16 are orientated downwardly with the concave surfaces of the seal stack groups in opposing relationship, the seal assembly 10 will be increasingly anchored when pressure is applied at either end of the seal assembly 10.The construction of the seal assembly 10 disclosed and defined herein greatly reduces sticking of the tool thereby enabling retrieval of the seal assembly without extensively damaging the seal members.
Extrusion of the Kalrez seal member 32 and therefore sticking of the seal assembly 10 is reduced by isolating the individual seal stacks 16 using the fixed retaining rings 22 and through the cooperating engagement of the
Kalrez member 32 with the adjacent spacer 24 which allows the Kalrez material to flow but not over the spacer 24.
To z lesser extent the knitted mesh seal member 44 reduces extrusion of both the Kalrez seal 32 and the Teflon seal 3E.
The foregoing detailed descrption has been -iven fcr clearness of understanding only and no w-me~essa-y limitations should be understood therefrom as some modifications will be obvious to those skilled in the art without departing from the scope and spirit of the appended cl2;
clair:
Claims (1)
1. A seal assembly for selectively sealing the annular space between an inner conduit carrying the seal assembly and an outer conduit within a well bore, said seal assembly comprising:
a plurality of longitudinally extending seal stacks, said seal stacks being separated from an adjacent seal stack by a retaining ring fixedly secured to the inner conduit, said seal stack comprising a plurality of annular seal members including at least one elastomeric seal member and at least one backup seal member adapted to prevent extrusion of said elastomeric seal member.
2. The seal assembly as defined in claim 1 wherein said seal stack further comprises a pair of outer spacing members, said at least one elastomeric seal member and said at least one backup seal member disposed between said outer spacing members.
3. The seal assembly as defined in claim 2 wherein said at least one backup seal member comprises an annular seal member c=ed cf z polymer ef tetrafluoroethylene an Er annular seal member formed cf a kr.tted metal mesh.
4. The seal assembly 9 defined in claim 3 wherein said at least one elastomerIc seal member comprises an annular seal member formed of a perfluoroelastomer.
5. The seal assembly as defined in claim 4 wherein said elastomeric seal member and said polytetrafluoro- ethylene seal member are substantially chevron-shaped in cross-section having first convex surfaces and second concave surfaces, said convex surface of said elastomeric seal member mating with said concave surface of. said polytetrafluoroethylene seal member.
6. The seal assembly as defined in claim 5 wherein said knitted metal mesh seal member includes a first planar surface and a second concave surface, said concave surface of said mesh seal member mating with said convex surface of said polytetrafluoroethylene seal member.
7. The seal assembly as defined in claim 6 wherein said planar surface of said mesh seal member engages one of said outer spacing members.
8. The seal assembly as defined in claim 7 wherein the other of said outer spacing members includes a first convex surface adapted to engage said second concave surface of said elastomeric seal member.
9. The seal assembly as defined in claim 8 wherein the angle normally formed by said second concave surface of said elastomeric seal member is normally greater than the angle formed by said first convex surface of said other outer spacing member such that said concave surface : said elastomeric seal member normally diverges ith respect to the convex surface of said outer spacing member whereby said convex surface of said spacing member partially mates with said concave surface c' said elastomeric seal members.
10. The seal assembly as defined in claim 1 wherein said seal assembly is sealed within a groove formed in the Inner conduit and defined by opposed shoulders, safd shoulders engaging said outer spacing members of the outermost seal stacks.
11. The seal assembly as defined in claim 10 wherein said plurality of seal stacks comprises six.
12. The seal assembly as defined in claim 10 wherein said plurality of annular seal members of said seal stack comprises three annular seal members disposed between a pair of rigid outer spacing members, said seal stacks being longitudinally compressible with respect to said retaining rings and said shoulders of said inner conduit.
13. The seal assembly as defined in claim 11 wherein said six seal stacks include three seal stacks disposed in one orientation and three seal stacks disposed in a reverse orientation.
14. The seal assembly as defined in claim 13 wherein one of the outer spacing members of each of the two innermost seal stacks abut each other.
15. A seal assembly for selectively sealing the annular space between an inner conduit carrying the seal assembly and an outer conduit within a well bore, said seal assembly comprising:
a plurality of longitudnally extending seal sacks, each h said seal stack being sQtE=Eted from an adjacent seal stack by z retaining ring fixedly secured to the inner conduit, said seal stacks longitudinally compressible with respect to said retaining rings, said seal stacks comprising a pair of annular rigid spacing members and three annular seal members disposed between said spacing members, said seal members comprising a knitted metal mesh seal member a seal member formed of a polymer of tetrafluoroethylene, and a seal member formed of a perfluouroelastomer.
16. The seal assembly as defined in claim 15 wherein said polytetrafluoroethylene seal member and said elastomeric seal member are substantially chevron-shaped in cross-section having first convex surfaces and second concave surfaces, said first convex surface of said elastomeric seal member mating with said concave surface of said polytetrafluoroethylene seal member.
17. The seal assembly as defined in claim 15 wherein said concave surface of said elastomeric seal member engages a convex surface of one of said rigid spacing members, the angle normally formed by said concave surface being normally greater than the angle formed by said convex surface of said spacing member whereby said concave surface of said elastomeric seal member normally diverges with respect to the convex surface of said spacing member.
18. The seal assembly as defined in claim 15 wherein said plurality of seal stacks is six seal stacks disposed within a groove formed in the inner conduit.
nc. n a seal system for selectively sealing the annular space between a first conduit carrying the seal system and a second conduit wit= a wel bore, s seal system comprising::
a plurality of longitudinal spaced seal assemblies individually seated within grooves formed in the firs conduit;
said seal assemblies comprising a plurality of annular seal stacks, said seal stacks ccm?risinç outer rigid spacing members and one each of a seal member formed of a perfluoroelastomer, a seal member formed of a polymer of tetrafluoroethylene, and a seal member formed of a knitted metal mesh.
20. The seal system as defined in claim 19 wherein said seal stacks are independently longitudinally compressible with respect to the inner conduit and at least one retaining ring fixedly secured to the inner conduit between adjacent seal stacks.
21. The seal system as defined in claim 20 wherein one of said spacing members includes a convex surface adapted to engage a concave surface of said perflucroelastomer seal member, the angle normally formed by said concave surface of said elastomeric seal member being normally greater than the angle formed by said convex surface of said spacing member such that said concave surface normally diverges from said convex surface of said spacing member and wherein said concave surface of said seal member engages said convex surface of said spacing member upon compression of said seal stack.
22. A well bore conduit seal assembly substantially as
hereinbefore described with reference to and as shown in the
accompanying drawings.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US2447887A | 1987-03-11 | 1987-03-11 |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB8805085D0 GB8805085D0 (en) | 1988-03-30 |
| GB2202283A true GB2202283A (en) | 1988-09-21 |
| GB2202283B GB2202283B (en) | 1990-10-17 |
Family
ID=21820793
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB8805085A Expired - Fee Related GB2202283B (en) | 1987-03-11 | 1988-03-03 | Seal system |
Country Status (3)
| Country | Link |
|---|---|
| CN (1) | CN1006729B (en) |
| GB (1) | GB2202283B (en) |
| NO (1) | NO170169C (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5131666A (en) * | 1990-10-12 | 1992-07-21 | Fisher Controls International, Inc. | Zero clearance anti-extrusion rings for containment of ptfe packing |
| US5584489A (en) * | 1995-06-07 | 1996-12-17 | Exxon Production Research Company | Primary and secondary seal assemblies with contacting convex surfaces |
| US5615896A (en) * | 1986-02-25 | 1997-04-01 | Morvant; John D. | Rubber encapsulated vee ring seal |
| GB2276152B (en) * | 1993-03-17 | 1997-08-13 | Victaulic Plc | Drum seals and drums sealed therewith |
| WO2007050618A1 (en) * | 2005-10-24 | 2007-05-03 | Baker Hughes Incorporated | Metal-to-metal non elastomeric seal stack |
| WO2010098930A3 (en) * | 2009-02-27 | 2010-11-11 | Halliburton Energy Services, Inc. | Sealing array for high temperature applications |
| US20180112776A1 (en) * | 2015-04-29 | 2018-04-26 | Graco Minnesota Inc. | Seals separated by retaining clip |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9243711B2 (en) * | 2011-07-19 | 2016-01-26 | Vetco Gray Inc. | Bi-directional pressure energized axial seal and a swivel connection application |
| CN102899945A (en) * | 2012-11-07 | 2013-01-30 | 江西瑞金金字电线电缆有限公司 | Sealing woven rope |
| CN103032040B (en) * | 2012-12-21 | 2015-12-02 | 成都欧迅海洋工程装备科技有限公司 | A kind of continuous circulation short circuit being applicable to air drilling |
| CN105674867B (en) * | 2016-01-21 | 2019-03-29 | 中国石油大学(北京) | A kind of high undersea hydrostatic pressures magnetostrictive displacement sensor sealing device |
| DE102016211214A1 (en) * | 2016-06-23 | 2017-12-28 | Trumpf Laser- Und Systemtechnik Gmbh | Construction cylinder arrangement for a machine for the layered production of three-dimensional objects, with fiber metal seal |
| CN110107247A (en) * | 2019-05-30 | 2019-08-09 | 广州加士特密封技术有限公司 | A kind of slip seals structure |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4433847A (en) * | 1982-03-25 | 1984-02-28 | Baker Oil Tools, Inc. | Conduit sealing system |
-
1988
- 1988-03-03 GB GB8805085A patent/GB2202283B/en not_active Expired - Fee Related
- 1988-03-11 CN CN88101275A patent/CN1006729B/en not_active Expired
- 1988-03-11 NO NO881085A patent/NO170169C/en unknown
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4433847A (en) * | 1982-03-25 | 1984-02-28 | Baker Oil Tools, Inc. | Conduit sealing system |
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5615896A (en) * | 1986-02-25 | 1997-04-01 | Morvant; John D. | Rubber encapsulated vee ring seal |
| US5131666A (en) * | 1990-10-12 | 1992-07-21 | Fisher Controls International, Inc. | Zero clearance anti-extrusion rings for containment of ptfe packing |
| GB2276152B (en) * | 1993-03-17 | 1997-08-13 | Victaulic Plc | Drum seals and drums sealed therewith |
| US5584489A (en) * | 1995-06-07 | 1996-12-17 | Exxon Production Research Company | Primary and secondary seal assemblies with contacting convex surfaces |
| WO1996041091A1 (en) | 1995-06-07 | 1996-12-19 | Exxon Production Research Company | Primary and secondary seal assemblies with contacting convex surfaces |
| GB2444893A (en) * | 2005-10-24 | 2008-06-18 | Baker Hughes Inc | Metal-to-metal non elastomeric seal stack |
| WO2007050618A1 (en) * | 2005-10-24 | 2007-05-03 | Baker Hughes Incorporated | Metal-to-metal non elastomeric seal stack |
| US7445047B2 (en) | 2005-10-24 | 2008-11-04 | Baker Hughes Incorporated | Metal-to-metal non-elastomeric seal stack |
| GB2444893B (en) * | 2005-10-24 | 2010-04-07 | Baker Hughes Inc | Metal-to-metal non elastomeric seal stack |
| NO340630B1 (en) * | 2005-10-24 | 2017-05-15 | Baker Hughes Inc | Sliding sleeve device for use inside a wellbore |
| WO2010098930A3 (en) * | 2009-02-27 | 2010-11-11 | Halliburton Energy Services, Inc. | Sealing array for high temperature applications |
| US8794638B2 (en) | 2009-02-27 | 2014-08-05 | Halliburton Energy Services, Inc. | Sealing array for high temperature applications |
| US20180112776A1 (en) * | 2015-04-29 | 2018-04-26 | Graco Minnesota Inc. | Seals separated by retaining clip |
| EP3289274A4 (en) * | 2015-04-29 | 2018-10-31 | Graco Minnesota Inc. | Seals separated by retaining clip |
Also Published As
| Publication number | Publication date |
|---|---|
| CN88101275A (en) | 1988-10-19 |
| NO881085D0 (en) | 1988-03-11 |
| NO170169B (en) | 1992-06-09 |
| NO881085L (en) | 1988-09-12 |
| CN1006729B (en) | 1990-02-07 |
| GB8805085D0 (en) | 1988-03-30 |
| NO170169C (en) | 1992-09-16 |
| GB2202283B (en) | 1990-10-17 |
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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: 19950303 |