WO1998037350A1 - Ensemble raccord de tuyaux - Google Patents

Ensemble raccord de tuyaux Download PDF

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Publication number
WO1998037350A1
WO1998037350A1 PCT/GB1998/000553 GB9800553W WO9837350A1 WO 1998037350 A1 WO1998037350 A1 WO 1998037350A1 GB 9800553 W GB9800553 W GB 9800553W WO 9837350 A1 WO9837350 A1 WO 9837350A1
Authority
WO
WIPO (PCT)
Prior art keywords
pipe
sleeve
ring
connection assembly
pipe connection
Prior art date
Application number
PCT/GB1998/000553
Other languages
English (en)
Inventor
Joseph Krist Mudge
Hamish Ian Esslemont
Thomas Kilpatrick Mclaughlin
Original Assignee
Maxtube Limited
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Maxtube Limited filed Critical Maxtube Limited
Priority to AU63009/98A priority Critical patent/AU6300998A/en
Priority to GB9919726A priority patent/GB2337091A/en
Publication of WO1998037350A1 publication Critical patent/WO1998037350A1/fr

Links

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
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L15/00—Screw-threaded joints; Forms of screw-threads for such joints
    • F16L15/001—Screw-threaded joints; Forms of screw-threads for such joints with conical threads
    • F16L15/004—Screw-threaded joints; Forms of screw-threads for such joints with conical threads with axial sealings having at least one plastically deformable sealing surface
    • 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
    • E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
    • 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
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
    • F16L55/16—Devices for covering leaks in pipes or hoses, e.g. hose-menders
    • F16L55/162—Devices for covering leaks in pipes or hoses, e.g. hose-menders from inside the pipe

Definitions

  • This invention relates to a pipe connection assembly, and relates more particularly but not exclusively to a corrosion-protected connection assembly for pipes carrying oil, gas or water at low or high pressure, such as casing tubulars .
  • a particular form of connector which is known under the Trade Mark “VAM” comprises a combination of shaped and externally threaded pipe ends, plus an internally threaded sleeve.
  • VAM- compatible pipe ends are both externally and internally tapered such as to form an axially projecting shoulder radially intermediate the inside and outside diameters of the pipe.
  • the matching sleeve is also double- tapered at each end in a form that is complementary to the pipe ends to provide a pair of circumferential grooves that are aligned in mutually opposite axial directions for seating the shoulder of a respective one of the two pipe ends to be mutually connected by the sleeve.
  • the pipes (including the pipe ends) and the sleeve are formed of metal which is desirably given a surface coating to protect against corrosion, particularly at the regions of contact between the pipe ends and the sleeve where they are exposed to the fluids carried within the pipe during its use.
  • plastics anti-corrosion coatings applied to these regions tend to be disrupted and dispersed by the forces involved in tightening a VAM-type connector, leaving the metal exposed to corrosive influences.
  • pipe connection assembly comprising, for each pipe connection, two pipe ends, a sleeve, and a resilient seal ring; each pipe end comprising a torque shoulder, and a ring entrapment surface located radially inwardly of the pipe end torque shoulder; where at least a portion of one of the ring entrapment surfaces is angled radially inwardly toward the other ring entrapment surface; the sleeve having two sleeve torque shoulders substantially complementary to the pipe end torque shoulders; whereby the configuration of the resilient seal ring and of the ring entrapment surfaces co-operate to retain the resilient seal ring within an annular cavity defined between the ring entrapment surfaces of the two pipe ends.
  • the pipe end torque shoulder tapers inwardly away from the axial extremity of the pipe.
  • a pipe connection assembly comprising, for each pipe connection, two pipe ends, a sleeve, and a resilient seal ring; each pipe end comprising a torque shoulder tapering inwardly away from the axial extremity of the pipe, and a ring entrapment surface located radially inwardly of the pipe end torque shoulder; the sleeve having two sleeve torque shoulders substantially complementary to the pipe end torque shoulders; whereby the configuration of the resilient seal ring and of the ring entrapment surfaces co-operate to retain the resilient seal ring within an annular cavity defined between the ring entrapment surfaces of the two pipe ends.
  • At least a portion of one of the ring entrapment surfaces is angled radially inwardly toward the other ring entrapment surface.
  • a pipe for use in a pipe connection assembly according to either of the first or second aspects of the present invention, one or both ends of the pipe comprising a respective torque shoulder, and a respective ring entrapment surface located radially inwardly of the pipe end torque shoulder.
  • the respective torque shoulder of the one or both ends of the pipe tapers inwardly away from the axial extremity of the pipe.
  • the sleeve further comprises a ring- supporting surface extending, and typically axially extending, between the two torque shoulders of the sleeve, and preferably between the radially innermost portions of the two torque shoulders of the sleeve.
  • the annular cavity is defined by the ring entrapment surfaces of the two pipe ends, and the ring- supporting surface of the sleeve.
  • a final pipe end connection component comprising one pipe end and a sleeve in a one piece unit, and a resilient seal ring, for attachment to the pip e end of a pipe in accordance with the third aspect of the invention which forms the last of a series of p p made up with the pipe connection assembly of either of the first or second aspects of the present invention.
  • the resilient seal ring is formed from a corrosion resistant material, thereby forming a corrosion resistant ring.
  • each pipe end further comprises (radially inwards from the radially outermost part of the pipe end) an external screw thread and a sealing surface tapering inwardly towards the axial extremity of the pipe.
  • the sleeve further comprises (radially outwards from the radially innermost part of the sleeve) the torque shoulder tapering outwardly away from the respective end of the sleeve, a sealing surface tapering outwardly towards the respective end of the sleeve, and an internal screw thread.
  • the ring entrapment surface of each pipe end is a ring entrapment shoulder, and preferably, the ring entrapment shoulder tapers inwardly towards the axial extremity of the pipe.
  • the ring supporting surface of the sleeve is preferably cylindrical and concentric with the longitudinal axis of the sleeve.
  • the ring preferably has a cross-sectional shape in its uncompressed state which substantially matches the trapezoidal shape of the annular cavity defined between the respective ring entrapment shoulders of the two mutually opposing pipe ends, and the ring supporting surface of the sleeve, the ring preferably having cross-sectional dimensions causing it to be an interference fit with this annular cavity whereby the ring is compressed in the made-up assembly.
  • Fig.l is a fragmentary cross-section in a longitudinal/radial plane of a first embodiment of pipe end
  • Fig.2 is a fragmentary cross-section in a longitudinal/radial plane of a first embodiment of pip connection assembly, incorporating the pipe end of Fig.1
  • Fig.3 is a fragmentary cross-section in a longitudinal/radial plane of a second embodiment of pipe end
  • Fig.4 is a fragmentary cross-section in a longitudinal/radial plane of a second embodiment of pipe connection assembly, incorporating the pip end of Fig. 3.
  • Fig.l this shows a fragment of pipe end 10 in cross-section, taken in a radial plane including the longitudinal axis of the pipe (not shown in Fig.l).
  • the part of the pipe end 10 which is the interior of the pipe (the rest of which is omitted from Fig.l) is at the bottom of Fig.l, while the exterior of the pipe is at the top of Fig.l.
  • the axial extremity of the pipe of which the pipe end 10 is a part is at the right of Fig.l, while the remainder of the pipe continues leftwards of Fig.l to the other axial extremity (which is either identical to the Fig.l end for an identical connection, or a differently dimensioned but otherwise identically formed connection for a similar connection to a larger or smaller pipe, or entirely different for a different form of connection to a different kind of pipe and/or to plant) .
  • the dimension 12 denotes the nominal wall thickness of the pipe ( ie the radial thickness of the pipe wall) .
  • the radially outermost part of the pipe end 10 is formed with an external screw thread 14 (schematically and incompletely depicted in Fig.l).
  • a sealing surface 16 Radially inwards of the thread 14 and axially towards the axial extremity of the pipe (at the right of Fig.l) is a sealing surface 16 which has a shallow conical taper converged radially inwards and axially towards the adjacent axial extremity of the pipe.
  • the sealing surface 16 is intended to form part of a metal-to-metal seal in a pipe connection involving the pipe end 10, as will subsequently be explained with reference to Fig.2.
  • a conically tapered torque shoulder 18 Radially inwards of the sealing surface 16 is a conically tapered torque shoulder 18 which converges radially inwards and axially away from the adjacent axial extremity of the pipe.
  • the sealing surface 16 and the torque shoulder 18 are mutually linked by a rounded transition 20.
  • the conical surface presented by the torque shoulder 18 would continue radially inwards at the same conicity until it intersected the radially inner surface of the pipe wall.
  • the radially innermost part of the conical torque shoulder in a VAM connector is modified as shown in Fig.l by the provision of an oppositely tapered ring entrapment shoulder 22 whose function will subsequently be detailed with reference to Fig.2.
  • the cone angle of the ring entrapment shoulder 22 is preferably about the same as the cone angle of the torque shoulder 18, but the ring entrapment shoulder 22 converges radially inwards and axially towards the adjacent axial extremity of the pipe ( ie oppositely to the taper of the torque shoulder 18).
  • the radial extent 23 of the ring entrapment shoulder 22 is preferably about 25% (one quarter) of the pipe wall thickness 12.
  • the inside surface 24 of the pipe, including the pipe end 10, is coated with a layer 26 of corrosion- resistant material which may, for example, be any suitable polymer and may be self-reinforced by being integrally mixed with glass fibres.
  • the pipewall- coating layer 26 is extended around onto the ring entrapment shoulder 22 as a liner extension 28 which partly covers the shoulder 22 from its radially innermost portion radially outwards towards but not as far as the junction of the shoulder 22 with the torque shoulder 18.
  • FIG.2 shows a fragment of pipe connection 100 in cross-section, taken in a radial plane including the common longitudinal axis (not shown in Fig.2) of the connection and the two adjacent pipes mutually conjoined thereby.
  • the connection 100 includes two pipe ends, 10A and 10B respectively.
  • the pipe end 10A is identical to the pipe end 10 previously described with reference to Fig.l (though somewhat less of the pipe end 10A is shown in Fig.2), while the pipe end 10B is a mirror image of the pipe end 10A (as viewed in Fig.2) but the pipe ends 10A and 10B are mutually identical in all other respects.
  • Parts of the pipe ends 10A and 10B which correspond to previously described parts of the pipe end 10 are given the same reference numeral together with a suffix "A" or "B" as appropriate .
  • the connection 100 further comprises a sleeve 102 which is externally cylindrical and internally shaped to be complementary to the pipe ends 10A and 10B, except that the sleeve 102 lacks a part complementary to the ring entrapment shoulders 22A and 22B.
  • a sleeve 102 which is externally cylindrical and internally shaped to be complementary to the pipe ends 10A and 10B, except that the sleeve 102 lacks a part complementary to the ring entrapment shoulders 22A and 22B.
  • Fig.2 is an internal thread at or near each end of the sleeve 102 and into which the pipe ends 10A and 10B are screwed by means of their respective external screw threads 14A, 14B (not shown in Fig.2).
  • the sleeve 102 Radially and axially inwards from these internal threads, the sleeve 102 has tapered sealing surfaces 104 which are complementary to the pipe end sealing surfaces 16A and 16B.
  • the sleeve surfaces 104 make metal-to-metal seals with the pipe end surfaces 16A and 16B in the made-up pipe connection 100, as in a conventional VAM connector.
  • Radially and axially inwards from the sealing surfaces 104 the sleeve 102 further comprises torque shoulders 106 which are complementary to the pipe end torque shoulders 18A and 18B, again as in a conventional VAM connector.
  • the sleeve 102 departs from the equivalent sleeve (not shown) of a conventional VAM connection by being formed with a cylindrical ring- supporting surface 108 which extends axially between the radially innermost edges of the two sleeve torque shoulders 106.
  • the equivalent of the surface 108 would have a much lower radius , such as to extend radially inwards to be substantially flush with the pipe wall) .
  • the pipe connection 100 further comprises a ring 110 of corrosion-resistant material also having suitable mechanical properties such as strength, elasticity, and creep resistance.
  • a suitable material for the ring 110 is PTFE (polytetrafluoroethylene) self-reinforced by being integrally mixed with glass fibres.
  • the ring 110 is trapeziform in cross-section to fit tightly into the trapezoidal annulus defined axially between the opposing ring-entrapment shoulders 22A and 22B, and radially inwards of the ring-supporting surface 108.
  • the dimensions of the unconfined ring 110 are preferably marginally larger than the confined ring as illustrated such that the ring 110 is an interference fit within the trapezoidal annulus and such that the ring 110 is compressed by the connection 100 being made up and tightened.
  • the ring 110 (of corrosion-resistant material) protects the sleeve 102 against contact with substances carried within the pipes and which may be corrosive.
  • the pipewall-coating layers 26A and 26B of corrosion- resistant material likewise protect the pipe bores, and the overlap of the liner extensions 28A and 28B with the ring 110 provides continuity of protection against corrosion across the axial width of the made-up pipe connection 100.
  • the pipe ends and pipeline connection assembly of Figs .1 and 2 thus provide interconnected pipes which have a corrosion-resistant interior that is free of gaps or interruptions that would otherwise expose the metal of the pipe ends and/or connector sleeve to possible corrosion.
  • FIG.3 shows a modified form 210 of the pipe end 10 of Fig.l.
  • the metallic part of the pipe end 210 is essentially the same in form as the pipe end 10, though it may have an overall size that is greater or smaller (according to required pipe capacity) .
  • the liner 26 which was directly applied to the inside surface 24 of the pipe in the pipe end 10 (Fig.l) is replaced in Fig.3 by a liner 226 which is adhered to the inside surface by means of a grout layer 227.
  • a suitable material for the liner 226 is GRE (glass-reinforced epoxy) , ie a pre-cast tube of epoxy resin self-reinforced by admixing a suitable proportion of glass fibres with the liquid epoxy prior to hardening thereof.
  • GRE glass-reinforced epoxy
  • the pipe end 210 is further modified with respect to the pipe end arrangement of Fig.l in that the liner extension 28 is replaced by a flanged annulus 228 which is conveniently formed of fibreglass-reinforced plastics material.
  • Fig.4 shows a pipe connection 300 which is the same as the pipe connection 100 of Fig.2 except that the pipe ends 10A and 10B of the Fig.2 arrangement are replaced in Fig.4 by pipe ends 210A and 210B which are respectively identical and mirror image versions of the pipe end 210 of Fig.3.
  • the ring 110 is trapeziform in cross-section to fit tightly into the trapezoidal annulus defined axially between the opposing ring-entrapment shoulders 22A and 22B, and radially inwards of the ring-supporting surface 108
  • other cross-sectional forms of the ring 110 may be required in order to fit differingly formed ring- entrapment shoulders 22A and 22B.
  • ring-supporting surface 108 may not extend radially inwardly to the extent shown in Fig.2 or Fig.4, that is the ring-supporting surface 108 has a greater radius than that shown in Fig.2 or Fig.4.
  • the ring 110 may have a greater outer radius than that shown in Fig.2 or Fig.4, and thus may encroach part-way up the pipe end torque shoulders 18, and thus have a hexagonal cross-section.
  • the outer radius of the ring 110 does not make contact with the ring- supporting surface 108, that is there is a gap between the outer radius of the ring 110 and the ring- supporting surface 108, and ring-supporting surface 108 will not in fact support the ring 110, but will be defined as the inner radius 108 of the sleeve 102.
  • the ring 110 will therefore be trapped in the made-up pipe connection 100 by the hexagonal form of the ring 110.
  • the final pipe end connection component may have either a through bore, or a closed bore in order to seal the end pipe.
  • This component will comprise one piece of metal, typically steel, and will, if it has a bore, comprise the sleeve 102 and one of the pipe-ends 10A or 10B all in one component.
  • the ring 110 is inserted into the component and seats against the equivalent ring-supporting surface 108 and the equivalent ring- entrapment shoulder 28A or 28B for the component.
  • the final end pipe-end 10A or 10B is then inserted into and torqued against the component until the desired level of torque is reached, as in the made-up pipe connection.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Mining & Mineral Resources (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Branch Pipes, Bends, And The Like (AREA)

Abstract

L'invention concerne un ensemble raccord (100; 300) de tuyaux comprenant, pour chaque raccord (100; 300), deux embouts (10A, 10B; 210A, 210B), un manchon (102) et une bague d'étanchéité élastique (110), de préférence en un matériau résistant à la corrosion. Chaque embout (10A, 10B; 210A, 210B) comporte un épaulement (18A, 18B) de retenue pouvant présenter un rétrécissement vers l'intérieur, à l'opposé de l'extrémité axiale (20) du tuyau, ainsi qu'une surface (22A, 22B) de retenue de bague située radialement vers l'intérieur de l'épaulement (18A, 18B) de retenue de l'embout (10A, 10B; 210A, 210B). Le manchon (102) présente des épaulements (106) de retenue sensiblement complémentaires des épaulements (18A, 18B) de retenue de l'embout (10A, 10B; 210A, 210B). Au moins une partie d'une des surfaces (22A, 22B) de retenue de bague peut être inclinée radialement vers l'intérieur en direction de l'autre surface (22A, 22B) de retenue de bague. La configuration de la bague d'étanchéité élastique (110) et celle des surfaces (22A, 22B) de retenue de bague leur permettent de coopérer pour maintenir la bague d'étanchéité élastique (110) à l'intérieur d'une cavité annulaire définie entre les surfaces (22A, 22B) de retenue de bague des deux embouts (10A, 10B; 210A, 210B). L'ensemble raccord de tuyaux (100; 300) convient en particulier pour des tuyaux, tels que des tubes de forage, transportant du pétrole, du gaz ou de l'eau à haute pression plancher.
PCT/GB1998/000553 1997-02-21 1998-02-23 Ensemble raccord de tuyaux WO1998037350A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
AU63009/98A AU6300998A (en) 1997-02-21 1998-02-23 Pipe connection assembly
GB9919726A GB2337091A (en) 1997-02-21 1998-02-23 Pipe connection assembly

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9703622.2 1997-02-21
GBGB9703622.2A GB9703622D0 (en) 1997-02-21 1997-02-21 Pipe connection system

Publications (1)

Publication Number Publication Date
WO1998037350A1 true WO1998037350A1 (fr) 1998-08-27

Family

ID=10808071

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1998/000553 WO1998037350A1 (fr) 1997-02-21 1998-02-23 Ensemble raccord de tuyaux

Country Status (3)

Country Link
AU (1) AU6300998A (fr)
GB (1) GB9703622D0 (fr)
WO (1) WO1998037350A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2283266A2 (fr) * 2008-05-30 2011-02-16 Robroy Industries, Inc. Ensemble et procédé d'accouplement de tubes pour tubes avec ou sans revêtement
US8740259B2 (en) 2011-02-02 2014-06-03 Tenaris Connections Limited Internally lined pipe connections and related methods of makeup
US11092266B2 (en) 2015-02-03 2021-08-17 925599 Alberta Ltd. Pipe connector
WO2021160943A1 (fr) * 2020-02-14 2021-08-19 Techlam Dispositif d'étanchéite entre deux conduites, notamment destinées au transport d'un fluide comportant un composant corrosif et/ou abrasif
US11339634B2 (en) 2015-04-10 2022-05-24 925599 Alberta Ltd. Pipe connector

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3572777A (en) * 1969-05-05 1971-03-30 Armco Steel Corp Multiple seal, double shoulder joint for tubular products
US4796668A (en) * 1984-01-09 1989-01-10 Vallourec Device for protecting threadings and butt-type joint bearing surfaces of metallic tubes
US5069485A (en) * 1989-10-26 1991-12-03 Union Oil Company Of California Brittle lined pipe connector
US5236230A (en) * 1991-05-09 1993-08-17 N.S. Pipe Technology, Inc. Coupling assembly

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3572777A (en) * 1969-05-05 1971-03-30 Armco Steel Corp Multiple seal, double shoulder joint for tubular products
US4796668A (en) * 1984-01-09 1989-01-10 Vallourec Device for protecting threadings and butt-type joint bearing surfaces of metallic tubes
US5069485A (en) * 1989-10-26 1991-12-03 Union Oil Company Of California Brittle lined pipe connector
US5236230A (en) * 1991-05-09 1993-08-17 N.S. Pipe Technology, Inc. Coupling assembly

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2283266A2 (fr) * 2008-05-30 2011-02-16 Robroy Industries, Inc. Ensemble et procédé d'accouplement de tubes pour tubes avec ou sans revêtement
EP2283266A4 (fr) * 2008-05-30 2013-03-20 Robroy Ind Inc Ensemble et procédé d'accouplement de tubes pour tubes avec ou sans revêtement
US8740259B2 (en) 2011-02-02 2014-06-03 Tenaris Connections Limited Internally lined pipe connections and related methods of makeup
US11092266B2 (en) 2015-02-03 2021-08-17 925599 Alberta Ltd. Pipe connector
US11892105B2 (en) 2015-02-03 2024-02-06 925599 Alberta Ltd. Pipe connector
US11339634B2 (en) 2015-04-10 2022-05-24 925599 Alberta Ltd. Pipe connector
WO2021160943A1 (fr) * 2020-02-14 2021-08-19 Techlam Dispositif d'étanchéite entre deux conduites, notamment destinées au transport d'un fluide comportant un composant corrosif et/ou abrasif
GB2608302A (en) * 2020-02-14 2022-12-28 Techlam Sealing device between two conduits, in particular for tranporting a fluid comprising a corrosive and/or abrasive component
GB2608302B (en) * 2020-02-14 2023-11-15 Techlam Sealing device between two conduits, in particular for tranporting a fluid comprising a corrosive and/or abrasive component

Also Published As

Publication number Publication date
AU6300998A (en) 1998-09-09
GB9703622D0 (en) 1997-04-09

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