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WO1998053179A1 - Procede de formation d'une structure tubulaire allongee et structure tubulaire formee selon ce procede - Google Patents

Procede de formation d'une structure tubulaire allongee et structure tubulaire formee selon ce procede Download PDF

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Publication number
WO1998053179A1
WO1998053179A1 PCT/GB1998/001502 GB9801502W WO9853179A1 WO 1998053179 A1 WO1998053179 A1 WO 1998053179A1 GB 9801502 W GB9801502 W GB 9801502W WO 9853179 A1 WO9853179 A1 WO 9853179A1
Authority
WO
WIPO (PCT)
Prior art keywords
tubular
members
tubular member
elongate
tubular structure
Prior art date
Application number
PCT/GB1998/001502
Other languages
English (en)
Inventor
Terence Jeffrey Corbishley
Jonathan Guy Corbishley
Original Assignee
T.J. Corbishley (Developments) Ltd.
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 T.J. Corbishley (Developments) Ltd. filed Critical T.J. Corbishley (Developments) Ltd.
Priority to AU76640/98A priority Critical patent/AU7664098A/en
Publication of WO1998053179A1 publication Critical patent/WO1998053179A1/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
    • F16L59/00—Thermal insulation in general
    • F16L59/14—Arrangements for the insulation of pipes or pipe systems

Definitions

  • the invention relates to a method of forming an 5 elongate tubular structure by connecting end-to-end first and second tubular structures which have co- extending elongate members there within.
  • the invention will be described with reference to its use in pipeline and tubular structural members such as those
  • onshore processing facilities 15 onshore processing facilities and between different offshore locations. These may be for processing purposes or for loading the oil or gas into shuttle tankers from offshore loading buoys .
  • a further alternative is to fabricate, at a suitable shore site, a bundled assembly formed of a
  • a carrier pipe 30 pipeline or group of pipelines housed within a large diameter outer steel pipeline, known as a carrier pipe.
  • the void space within the carrier pipe and around the pipelines housed within it is sealed to prevent the ingress of water.
  • thermal insulation of the pipelines helps to avoid this and is currently achieved by the application to their external surface a suitable insulation material.
  • the materials are presently applied by various processes including extrusion, impingement, wrapping and casting.
  • thermal insulation is achieved by housing the fluid carrying pipeline or flowline, as it is commonly termed, within an outer and additional pipeline. This is known as a "pipe-in-pipe" system.
  • the annulus between the inner flowline and outer pipeline may be filled with thermal msulant having low order thermal conductivity, such as polyurethane foams, mineral wool or ceramic microspheres .
  • the annulus gap may be a vacuum or full of gas.
  • tubular structural members such as the tethers on Tension Leg Platforms
  • short lengths of "tube-m-tube” structural members are adjoined end to end by either butt welding, internal or external collars secured by fillet welds or mechanical means such as screwed ends or splined connectors.
  • An object of the present invention is to provide a pipe-in-pipe type of structure which can be used to provide buoyancy and/or thermal insulation and/or strength to the inner pipeline, but which does not inhibit the thermal expansion or movement thereof.
  • a further object of the present invention is to provide a convenient method of constructing such a structure .
  • each tubular structure comprises an inner tubular member located within a co-extending outer tubular member, comprising the steps of forming the outer tubular members by connecting together the ends of coaxial tubular elements to form a double skinned sealed unit defining an annular void within; joining together adjacent ends of the inner tubular members of the first and second tubular structures; providing supports to hold the outer tubular members spaced apart from the inner tubular members to thereby define an annulus between the inner and outer members; displacing the outer tubular member of the second structure axially along the inner tubular member of the second structure, until it at least partially overlies the inner tubular member of the first tubular structure and at least partially abuts the outer tubular member of the first structure; and joining together the abutting outer tubular members of the first and second tubular structures .
  • the first tubular structure is preferably an elongate tubular structure formed
  • the inner tubular members of the tubular structures may be joined together by welding.
  • additional supports are provided at least partially between adjacent ends of the outer tubular members to hold the outer tubular members spaced from the inner tubular members.
  • Each tubular structure preferably comprises a plurality of parallel inner tubular members each of which parallel inner tubular members is joined to a corresponding inner tubular member in an adjoining tubular structure.
  • the method preferably further comprises the step of introducing a liquid or flowable mixture into the annulus between the inner and outer tubular members to an extent whereby, during installation of the elongate structure on a sea bed when the elongate structure extends upwards from the sea bed towards or to the surface of the sea, the liquid or flowable mixture subjects internal surfaces of the outer members to a pressure sufficient to oppose the pressure exerted on the external surface of the outer member in order to prevent or resist collapse of the outer members; and preferably also the step of evacuating the outer tubular member.
  • the void within the outer tubular member may be filled with a gas or a liquid or a thermal insulant or a lightweight material or ballast.
  • the annulus between the inner and outer members may be left empty or evacuated.
  • the annulus between the inner and outer members may alternatively be filled with a gas or a liquid or a thermal insulant or a lightweight material or ballast or a settable liquid or flowable material.
  • the outer member is preferably made of an impermeable material .
  • the invention also provides an elongate tubular structure formed by the method described above.
  • FIG. 1 shows a side sectional elevation of a section of a tubular structure according to the present invention in which the outer members are abutted;
  • Figs. 2 and 3 show side sectional elevations of another embodiment of a tubular structure according to the invention in which the outer members are not abutted;
  • Fig.4 shows a schematic illustration of a flowline according to the invention during installation on the seabed.
  • the structure comprises inner tubular members 1 (e.g. la, lb,lc), joined end-to-end by welded connections 2, to form a flowline, and coaxial outer tubular members 3 (e.g. 3a, 3b, 3c) within which the inner members 1 are located.
  • the outer tubular members 3 comprise double skinned sealed direct shells preferably of an impermeable material.
  • the members 3 may contain a thermal insulating material 7, such as ceramic microspheres, mineral wool or polyurethane foam.
  • the shells may contain a gas such as nitrogen or carbon dioxide, ballast material or be empty or evacuated.
  • Each of the outer members 3 terminates short of each end of the respective inner members 1.
  • Each outer member 3 is constructed from two coaxial tubular elements the ends of which are welded together by means of annular connectors 8,9 to form a sealed unit.
  • the outer element is set back relative to the inner element and the front and rear connectors are shaped to allow the rear end 10 of the outer element to project from the member 3.
  • Each outer member 3 is slid along the inner members 1 until its front end abuts the rear end connector of the previously positioned member 3 and is welded thereto.
  • the front end of each outer member 3 is located under the rearwardly projecting end 10 of the outer element of the preceding outer member 3.
  • the end 10 is joined by means of weld 6 to the outer element of the adjacent outer member 3.
  • Supporting the outer members 3 on the inner members 1 are a pair of supports 4, 5.
  • the supports 4,5 can act as spacers or bulkheads and are substantially annular disks of rubber/steel or another suitable material which is capable of being slid along the inner member 1.
  • the supports 4, 5 fix the position of the outer members 3 relative to the inner members 1.
  • the supports 4,5 may be positioned around the inner members 3 before the outer members are placed around them Alternatively, they may be positioned afterwards, in which case they need to slide inside the outer members also.
  • the annular spaces defined between the co-axial inner and outer members 1,3 between the spacers 4,5 are evacuated, or empty or are filled with a lightweight or an insulating material, ballast or a gas, such as nitrogen or carbon dioxide.
  • a liquid, fluid or flowable mixture may be passed through the spaces to provide a means of heating or cooling the inner members or for balancing pressures acting on the external surface of the outer member and that between the inner and outer member.
  • the spaces may be filled with a settable liquid or flowable mixture which subsequently sets to form a solid matrix.
  • tubular members described in the foregoing description are cylindrical pipes for a flowline, the tubular members could have any chosen cross section.
  • the gap between the inner and outer members may be sufficient to allow expansion or partial expansion of the inner pipe, laterally, in a spiral formulation or longitudinally beyond the ends of the pipeline, or a combination of all three.
  • FIG 2 there is shown an alternative tubular structure of the present invention.
  • the individual outer double skinned members 3 do not wholly abut each other. This facilitates the making of welded connection 6.
  • each end of the outer elements of the outer members 3 projects beyond the inner elements and these are welded to the outer elements of adjacent outer members.
  • Figure 2 only shows the use of a single annular spacer 4 per outer member 3. As many or as few can be used as required for each application.
  • FIG 3 a further embodiment is illustrated in which the outer members 3 do not wholly abut each other. However in addition to supports 4 further supports 11 are used which fill the gap between the front and rear ends of adjacent outer members 3 as well as supporting them. This structure helps to spread the external loads applied to the outer members 3 to the flowline 1.
  • the basic shape of the outer members 3 is very similar to that shown in Figure 1.
  • a plurality of the tubular structures described above can be joined together to form an elongate tubular structure or flowline using the method described in our co-pending application GB 9703218.9 the contents of which are incorporated herein by reference. Essentially adjacent ends of two inner members are first joined together.
  • the outer tubular member of the second structure is displaced along the second outer tubular member in an axial direction until it at least partially overlies the first inner tubular member and at least partially abuts the adjacent outer tubular member.
  • the adjacent outer members are then joined together.
  • the joins are made preferably by welding.
  • Figure 4 shows an elongate tubular structure or flowline 20, constructed from a plurality of tubular structures, being installed on the seabed 21.
  • the structure extends from the seabed 21 to the surface of the sea 22 with a liquid or a flowable mixture 23 introduced during the installation of the structure 20 to exert pressure on the outer member 3 from within the annulus between the outer and inner members 3 , 1 to oppose the pressure acting on the external surface of the outer member 3 by the surrounding sea water.
  • the free surface of the liquid 23 in the annulus is determined so that the pressure exerted on the internal surface of the outer members 3 resists or opposes the hydrostatic collapse of the outer member 3 due to the pressure exerted on it by the seawater external to the outer members 3.
  • a liquid or flowable mixture may be selected such that it sets either during or following installation onto the seabed.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Rigid Pipes And Flexible Pipes (AREA)
  • Earth Drilling (AREA)

Abstract

L'invention concerne un procédé de formation d'une structure tubulaire allongée, ce procédé consistant à raccorder, par leurs extrémités, une première et une seconde structures tubulaires. L'invention concerne également une structure tubulaire allongée formée selon ce procédé. Chaque structure tubulaire comprend un élément tubulaire intérieur, placé à l'intérieur d'un élément tubulaire extérieur qui s'étend dans la même direction que ledit élément tubulaire intérieur. Ce procédé comprend les étapes consistant: à former ledit élément tubulaire extérieur, par raccordement des extrémités d'éléments tubulaires coaxiaux, afin de former une unité hermétique à double paroi, définissant un espace vide annulaire; à raccorder les extrémités adjacentes desdits éléments tubulaires intérieurs; à fournir des supports destinés à soutenir lesdits éléments tubulaires extérieurs séparés des éléments tubulaires intérieurs, afin de définir un espace annulaire entre ces éléments intérieurs et extérieurs; à déplacer axialement l'élément tubulaire extérieur de la seconde structure, le long de l'élément tubulaire intérieur, jusqu'à ce que ledit élément tubulaire extérieur chevauche au moins en partie l'élément tubulaire intérieur de la première structure tubulaire, et confine au moins en partie audit élément tubulaire extérieur de la première structure; et à raccorder les éléments tubulaires extérieurs adjacents de la première et de la seconde structure tubulaire.
PCT/GB1998/001502 1997-05-23 1998-05-22 Procede de formation d'une structure tubulaire allongee et structure tubulaire formee selon ce procede WO1998053179A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU76640/98A AU7664098A (en) 1997-05-23 1998-05-22 Method of forming an elongate tubular structure and tubular structure formed thereby

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9710758.5 1997-05-23
GB9710758A GB2325507B (en) 1997-05-23 1997-05-23 Improvements in methods of forming an elongate tubular structure

Publications (1)

Publication Number Publication Date
WO1998053179A1 true WO1998053179A1 (fr) 1998-11-26

Family

ID=10813014

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1998/001502 WO1998053179A1 (fr) 1997-05-23 1998-05-22 Procede de formation d'une structure tubulaire allongee et structure tubulaire formee selon ce procede

Country Status (3)

Country Link
AU (1) AU7664098A (fr)
GB (1) GB2325507B (fr)
WO (1) WO1998053179A1 (fr)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2339251B (en) * 1998-06-23 2003-06-18 British Steel Plc Laying of undersea pipes
GB9912451D0 (en) 1999-05-27 1999-07-28 Saipem Spa Insulated pipe structure and methods of making such structures
US6397895B1 (en) 1999-07-02 2002-06-04 F. Glenn Lively Insulated pipe
BR9917595A (pt) * 1999-12-22 2002-08-06 Corus Uk Ltd Métodos de conectar uma primeira e uma segunda seções de tubo de parede dupla e de colocar estruturas de tubo de parede dupla, seção de tubo de parede dupla, aparelho para manusear estruturas de tubo de parede dupla, e, estrutura de tubo de parede dupla
NL1014998C2 (nl) * 2000-04-20 2001-10-24 Heerema Marine Contractors Nl Oplijnen van pijpen of pijpcomponenten.
GB2396196A (en) * 2002-12-12 2004-06-16 Stolt Offshore Sa Pipe-in-pipe structure and its method of fabrication
FR2918149B1 (fr) * 2007-06-29 2009-09-25 Inst Francais Du Petrole Conduite renforcee a deux enveloppes et methode de fabrication.
CN101852325A (zh) * 2010-05-19 2010-10-06 清华大学 保温层结构

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1274537B (de) * 1967-01-25 1968-08-08 Masch Und Bohrgeraete Fabrik Verbindung zwischen Innenrohr und Aussenrohr bei als Bohrgestaenge verwendbaren Doppelmantelrohren
DE4211081C1 (en) * 1992-04-03 1993-09-16 Ing. G. Klemm Bohrtechnik Gmbh, 57489 Drolshagen, De Multiple drill pipe - allows limited inner pipe projection to facilitate coupling to other drill pipes
EP0571346A1 (fr) * 1992-05-19 1993-11-24 Atlas Copco Rocktech Ab Elément de tige de forage
WO1995032355A1 (fr) * 1994-05-25 1995-11-30 Roxwell International Ltd. Colonne de production isolee a double paroi, et son procede d'installation

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1238022A (fr) * 1967-09-18 1971-07-07
GB1341704A (en) * 1971-04-19 1973-12-25 British Oxygen Co Ltd Thermally-insulated pipeline sections
US4502370A (en) * 1983-04-15 1985-03-05 Interpace Corporation Insulated chimney assembly
DE3600028C1 (de) * 1986-01-02 1987-01-08 Witzenmann Metallschlauchfab Vorrichtung zum elastischen Verbinden zweier Mantelrohrleitungen

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1274537B (de) * 1967-01-25 1968-08-08 Masch Und Bohrgeraete Fabrik Verbindung zwischen Innenrohr und Aussenrohr bei als Bohrgestaenge verwendbaren Doppelmantelrohren
DE4211081C1 (en) * 1992-04-03 1993-09-16 Ing. G. Klemm Bohrtechnik Gmbh, 57489 Drolshagen, De Multiple drill pipe - allows limited inner pipe projection to facilitate coupling to other drill pipes
EP0571346A1 (fr) * 1992-05-19 1993-11-24 Atlas Copco Rocktech Ab Elément de tige de forage
WO1995032355A1 (fr) * 1994-05-25 1995-11-30 Roxwell International Ltd. Colonne de production isolee a double paroi, et son procede d'installation

Also Published As

Publication number Publication date
GB2325507B (en) 1999-04-07
GB9710758D0 (en) 1997-07-23
GB2325507A (en) 1998-11-25
AU7664098A (en) 1998-12-11

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