WO2008072970A1 - Method for laying a pipeline having an inner corrosion proof cladding - Google Patents

Method for laying a pipeline having an inner corrosion proof cladding Download PDF

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Publication number
WO2008072970A1
WO2008072970A1 PCT/NO2007/000427 NO2007000427W WO2008072970A1 WO 2008072970 A1 WO2008072970 A1 WO 2008072970A1 NO 2007000427 W NO2007000427 W NO 2007000427W WO 2008072970 A1 WO2008072970 A1 WO 2008072970A1
Authority
WO
WIPO (PCT)
Prior art keywords
pipeline
overpressure
onto
section
sections
Prior art date
Application number
PCT/NO2007/000427
Other languages
French (fr)
Other versions
WO2008072970A8 (en
Inventor
Geir Endal
Erik Levold
Håvar ILSTAD
Original Assignee
Statoil Asa
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 Statoil Asa filed Critical Statoil Asa
Priority to US12/448,109 priority Critical patent/US8226327B2/en
Priority to MX2009006163A priority patent/MX2009006163A/en
Priority to BRPI0720040A priority patent/BRPI0720040B8/en
Priority to EA200970571A priority patent/EA014925B1/en
Priority to EP07851986A priority patent/EP2092160B1/en
Priority to AU2007332207A priority patent/AU2007332207B2/en
Priority to CA2672210A priority patent/CA2672210C/en
Priority to AT07851986T priority patent/ATE533917T1/en
Priority to JP2009541251A priority patent/JP5311672B2/en
Publication of WO2008072970A1 publication Critical patent/WO2008072970A1/en
Publication of WO2008072970A8 publication Critical patent/WO2008072970A8/en

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
    • F16L1/00—Laying or reclaiming pipes; Repairing or joining pipes on or under water
    • F16L1/12—Laying or reclaiming pipes on or under water
    • F16L1/16—Laying or reclaiming pipes on or under water on the bottom
    • F16L1/18—Laying or reclaiming pipes on or under water on the bottom the pipes being S- or J-shaped and under tension during laying
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B35/00—Vessels or similar floating structures specially adapted for specific purposes and not otherwise provided for
    • B63B35/03—Pipe-laying vessels
    • 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
    • F16L1/00—Laying or reclaiming pipes; Repairing or joining pipes on or under water
    • F16L1/12—Laying or reclaiming pipes on or under water
    • F16L1/16—Laying or reclaiming pipes on or under water on the bottom
    • F16L1/161—Laying or reclaiming pipes on or under water on the bottom the pipe being composed of sections of short length
    • 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
    • F16L1/00—Laying or reclaiming pipes; Repairing or joining pipes on or under water
    • F16L1/12—Laying or reclaiming pipes on or under water
    • F16L1/20—Accessories therefor, e.g. floats, weights
    • F16L1/202—Accessories therefor, e.g. floats, weights fixed on or to vessels
    • F16L1/203—Accessories therefor, e.g. floats, weights fixed on or to vessels the pipes being wound spirally prior to laying
    • 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
    • F16L58/00—Protection of pipes or pipe fittings against corrosion or incrustation
    • F16L58/02—Protection of pipes or pipe fittings against corrosion or incrustation by means of internal or external coatings
    • F16L58/04—Coatings characterised by the materials used
    • F16L58/08—Coatings characterised by the materials used by metal

Definitions

  • the current invention relates to pipelines, which are laid onto the seabed, and more precisely a method for laying a pipeline onto a seabed from a lay barge, the pipeline having an inner corrosion proof metallic cladding that is closely fitted with metallic contact to an outer pipe material that is less corrosion proof.
  • a pipeline of the type mentioned can be arranged onto and lay into place from a laying drum on the lay barge.
  • One such less expensive alternative is a pipeline of carbon steel with an inner more corrosion proof cladding.
  • the strength of the carbon steel is thereby combined with the corrosion resistance of the cladding.
  • the cladding is typically produced from a corrosion proof steel, a so-called stainless steel, and the cladding typically has a thickness from lto 7 mm, most typically about 3 mm.
  • the cladding is fitted to the carbon steel pipeline's interior surface, either with mechanical contact or with metallurgical bonding by means of hot rolling (roll welding), welding, brazing or clad welding.
  • the obviously least expensive alternative is that the inner cladding is fitted mechanically tightly against the carbon steel pipeline with metallic contact without any room in between.
  • this embodiment has proven to be inadequate with respect to laying by reeling out from a pipe laying drum onboard a lay barge because the inner cladding becomes deformed by so-called "buckling/wrinkling", such as bulging, buckling, and subsequently possible fracturing. Such deformation will result in that the inner cladding will loosen from the carbon steel pipeline's interior surface, causing it to loose its ability to resist the impact during operation of the pipeline. This represents a problem, which needs to be solved. No prior art is known solving the above-mentioned problem, which previously appears not to be particularly focused upon.
  • the above mentioned problem is solved with this invention by providing a method for laying a pipeline onto a seabed from a lay barge, the pipeline having an inner corrosion proof metallic cladding that is closely fitted with metallic contact to an outer pipe material that is less corrosion proof.
  • the method is distinguished in that a) a section of the pipeline is reeled onto a pipe laying drum, whilst an overpressure of 5-25 bar is maintained within the section by means of a pressurised fluid inside the section, b) a further pipeline section is joined to the section already reeled onto the pipe laying drum, whilst the pipeline is motionless without mechanical movement, as the overpressure can be relieved as long as the sections are without mechanical movement, c) an overpressure of 5-25 bar is applied within the sections and the further section is reeled onto the pipe laying drum, d) several sections are joined together and reeled onto one or several pipe laying drums by repeating step b) and c) until the predetermined pipeline length is achieved, e) the pipeline is laid from the lay bar
  • an overpressure of 5-25 bar refers to that the inner cladding is biased with a pressure corresponding to 5-25 bar absolute (0.5-2.5MPa) against the interior surface of the outer pipe material, which is less corrosion proof.
  • a pressure lower than approximately 5 bar results in risk for deformation such as "buckling/wrinkling", whilst a higher pressure than approximately 25 bar would be impractical and may create problems.
  • the laying of pipelines onto the seabed is normally operated by means of large specialised lay barges.
  • large drums so-called pipe laying drums, with a diameter typically between 10 and 30 meters, it is possible to even lay massive steel pipelines, which are reeled onto the pipe laying drum beforehand.
  • the pipeline is then lowered onto the seabed using conventional method, for instance by S- or J- laying referring to the shape of the pipeline through the sea.
  • the pipe laying drum typically has installed many pre-fabricated sections, where each section is typically lkm long.
  • the cladding is typically of stainless steel with a thickness of 3mm, although other materials and thicknesses may also be usable. Increased cladding thickness may be an advantage as regards to pipes with large dimensions, in order to maintain correct surface pressure between the pipe materials.
  • the exterior pipe material which is less corrosion proof, is typically a thick walled carbon steel pipe, but other materials may also be usable.
  • an overpressure is applied within the pipeline or the sections thereof; at typically 5-25 bar by means of a pressurised fluid within the sections or pipeline.
  • the necessary pressure is dependent on the diameter of the pipeline and the thickness of the inner corrosion proof cladding. Increased pressure will be necessary for increased diameter and a thinner cladding.
  • a 5-10 bar overpressure is adequate for a 8" -10" pipe and a 2 -3 mm thick cladding, whilst 10- 20 bar overpressure is adequate for a 16" pipe with 2-3 mm thick cladding.
  • the fluid can be nearly any form of liquid or gas, such as water under pressure, air (atmosphere) under pressure or an inert gas under pressure.
  • water is preferred as the pressure medium because water is easily available and it is non- compressible and easy to pressurize to suitable pressure. If the vessel's capacity for storing and/or tension becomes critical due to the weight of the water-filled pipelines on the pipe laying drum, the preference is to use gas, for example compressed air. A necessary low overpressure will also make it more suitable to use a gas as pressurised fluid.
  • the entire pipeline should be reeled onto one pipe laying drum to avoid joining between pipeline lengths on different pipe laying drums.
  • the problem of joining may however be avoided by bringing the pipeline though the centre of one pipe laying drums to the centre of the next pipe laying drum, and rotate the drums synchronically during the laying and winding of the pipe.
  • separate methods may be used for joining the pipeline sections, for instance by installing an ice plug on either one or both sides of the joint, whereby the overpressure can be maintained.
  • Other devices, such as plugs and valves are also usable; likewise, various connecting subs and swivels.
  • the pipe sections are preferably mounted on to one or several pipe laying drums, directly onboard the pipe- laying vessel, otherwise the drums holding the pipe sections may be transported out to the lay barge and transferred onboard.

Abstract

Method for laying a pipeline onto a seabed from a lay barge, the pipeline having an inner corrosion proof metallic cladding that is closely fitted with metallic contact to an outer pipe material that is less corrosion proof, distinguished in that a) a section of the pipeline is reeled onto a pipe laying drum, whilst an overpressure of 5-25 bar is maintained within the section by means of a pressurised fluid inside the section, b) a further pipeline section is joined to the section already reeled onto the pipe laying drum, whilst the pipeline is motionless without mechanical movement, as the overpressure can be relieved as long as the sections are without mechanical movement, c) an overpressure of 5-25 bar is applied within the sections and the further section is reeled onto the pipe laying drum, d) several sections are joined together and reeled onto one or several pipe laying drums by repeating step b) and c) until the predetermined pipeline length is achieved, e) the pipeline is laid from the lay barge onto the seabed using conventional method, whilst an overpressure of 5-25 bar is maintained within the pipeline by means of a pressurised fluid until the pipeline is correctly placed onto the seabed.

Description

Method for laying a pipeline having an inner corrosion proof cladding.
Area of Invention
The current invention relates to pipelines, which are laid onto the seabed, and more precisely a method for laying a pipeline onto a seabed from a lay barge, the pipeline having an inner corrosion proof metallic cladding that is closely fitted with metallic contact to an outer pipe material that is less corrosion proof. With the method according to the invention, a pipeline of the type mentioned can be arranged onto and lay into place from a laying drum on the lay barge.
Background of the Invention and Prior Art
With an increasing need for transporting unprocessed well streams from underwater facilities, and more frequent occurrence of aggressive fluids with need to be transported, there is an increased demand for corrosion proof pipelines. However, the cost for pipelines of corrosion proof material has dramatically increased, and less expensive alternatives are therefore being sought after.
One such less expensive alternative is a pipeline of carbon steel with an inner more corrosion proof cladding. The strength of the carbon steel is thereby combined with the corrosion resistance of the cladding. The cladding is typically produced from a corrosion proof steel, a so-called stainless steel, and the cladding typically has a thickness from lto 7 mm, most typically about 3 mm. The cladding is fitted to the carbon steel pipeline's interior surface, either with mechanical contact or with metallurgical bonding by means of hot rolling (roll welding), welding, brazing or clad welding. The obviously least expensive alternative is that the inner cladding is fitted mechanically tightly against the carbon steel pipeline with metallic contact without any room in between. However, this embodiment has proven to be inadequate with respect to laying by reeling out from a pipe laying drum onboard a lay barge because the inner cladding becomes deformed by so-called "buckling/wrinkling", such as bulging, buckling, and subsequently possible fracturing. Such deformation will result in that the inner cladding will loosen from the carbon steel pipeline's interior surface, causing it to loose its ability to resist the impact during operation of the pipeline. This represents a problem, which needs to be solved. No prior art is known solving the above-mentioned problem, which previously appears not to be particularly focused upon. Background art is represented by the patent publications US 2003/0056954 Al, which relates to a method for maintaining a pipeline in operation; US 6,142, 707, which relates to direct electrical heating of a pipeline; and EP 1233143 Al , which relates to coiled tubing operations inside wells. Said patent publications describe an inner pipe installed within an outer pipe, but with spacing between said pipes and for most embodiments the inner pipe is a composite coiled tubing. The prior art referred to above relates to other problems than the problem underlying the present invention.
Summary of the Invention
The above mentioned problem is solved with this invention by providing a method for laying a pipeline onto a seabed from a lay barge, the pipeline having an inner corrosion proof metallic cladding that is closely fitted with metallic contact to an outer pipe material that is less corrosion proof. The method is distinguished in that a) a section of the pipeline is reeled onto a pipe laying drum, whilst an overpressure of 5-25 bar is maintained within the section by means of a pressurised fluid inside the section, b) a further pipeline section is joined to the section already reeled onto the pipe laying drum, whilst the pipeline is motionless without mechanical movement, as the overpressure can be relieved as long as the sections are without mechanical movement, c) an overpressure of 5-25 bar is applied within the sections and the further section is reeled onto the pipe laying drum, d) several sections are joined together and reeled onto one or several pipe laying drums by repeating step b) and c) until the predetermined pipeline length is achieved, e) the pipeline is laid from the lay barge onto the seabed using conventional method, whilst an overpressure of 5-25 bar is maintained within the pipeline by means of a pressurised fluid until the pipeline is correctly placed onto the seabed. There are particularly two features of importance in this connection, namely that it is adequate with a relatively moderate overpressure, typically 5-25 bar, in order to avoid deformation (buckling/wrinkling) and lack of contact between the inner cladding and the outer pipeline material, and that the pipeline or pipeline sections shall have no mechanical movement when the prescribed overpressure is not applied within the pipeline or sections thereof. The term "without mechanical movement" means no reeling onto or unwinding from the pipe laying drum; or lowering of the pipeline from the lay barge onto the seabed, without the prescribed overpressure. Strain for instance during welding of the pipe sections is acceptable, so is minor deformations, as long as the deformation is minor compared to what the pipeline and components thereof are exposed to when reeling onto a typical pipe laying drum. The term an overpressure of 5-25 bar, refers to that the inner cladding is biased with a pressure corresponding to 5-25 bar absolute (0.5-2.5MPa) against the interior surface of the outer pipe material, which is less corrosion proof. A pressure lower than approximately 5 bar results in risk for deformation such as "buckling/wrinkling", whilst a higher pressure than approximately 25 bar would be impractical and may create problems.
Detailed Description The laying of pipelines onto the seabed is normally operated by means of large specialised lay barges. By using large drums, so-called pipe laying drums, with a diameter typically between 10 and 30 meters, it is possible to even lay massive steel pipelines, which are reeled onto the pipe laying drum beforehand. The pipeline is then lowered onto the seabed using conventional method, for instance by S- or J- laying referring to the shape of the pipeline through the sea. The pipe laying drum typically has installed many pre-fabricated sections, where each section is typically lkm long. The cladding is typically of stainless steel with a thickness of 3mm, although other materials and thicknesses may also be usable. Increased cladding thickness may be an advantage as regards to pipes with large dimensions, in order to maintain correct surface pressure between the pipe materials. The exterior pipe material, which is less corrosion proof, is typically a thick walled carbon steel pipe, but other materials may also be usable.
So far it has not been possible to lay pipelines with an inner cladding of the type mentioned above since the cladding has been deformed by buckling, and this is the problem solved with the current invention.
With the current invention, an overpressure is applied within the pipeline or the sections thereof; at typically 5-25 bar by means of a pressurised fluid within the sections or pipeline. The necessary pressure is dependent on the diameter of the pipeline and the thickness of the inner corrosion proof cladding. Increased pressure will be necessary for increased diameter and a thinner cladding. A 5-10 bar overpressure is adequate for a 8" -10" pipe and a 2 -3 mm thick cladding, whilst 10- 20 bar overpressure is adequate for a 16" pipe with 2-3 mm thick cladding. The fluid can be nearly any form of liquid or gas, such as water under pressure, air (atmosphere) under pressure or an inert gas under pressure. On most occasions, water is preferred as the pressure medium because water is easily available and it is non- compressible and easy to pressurize to suitable pressure. If the vessel's capacity for storing and/or tension becomes critical due to the weight of the water-filled pipelines on the pipe laying drum, the preference is to use gas, for example compressed air. A necessary low overpressure will also make it more suitable to use a gas as pressurised fluid.
Preferably, the entire pipeline should be reeled onto one pipe laying drum to avoid joining between pipeline lengths on different pipe laying drums. The problem of joining may however be avoided by bringing the pipeline though the centre of one pipe laying drums to the centre of the next pipe laying drum, and rotate the drums synchronically during the laying and winding of the pipe. Alternatively, separate methods may be used for joining the pipeline sections, for instance by installing an ice plug on either one or both sides of the joint, whereby the overpressure can be maintained. Other devices, such as plugs and valves are also usable; likewise, various connecting subs and swivels.
Pumps, compressors, and necessary pipe system to control the overpressure need to be installed onboard the lay barge. The pipe sections are preferably mounted on to one or several pipe laying drums, directly onboard the pipe- laying vessel, otherwise the drums holding the pipe sections may be transported out to the lay barge and transferred onboard.

Claims

Claims
1. Method for laying a pipeline onto a seabed from a lay barge, the pipeline having an inner corrosion proof metallic cladding that is closely fitted with metallic contact to an outer pipe material that is less corrosion proof, characterised in that a) a section of the pipeline is reeled onto a pipe laying drum, whilst an overpressure of 5-25 bar is maintained within the section by means of a pressurised fluid inside the section, b) a further pipeline section is joined to the section already reeled onto the pipe laying drum, whilst the pipeline is motionless without mechanical movement, as the overpressure can be relieved as long as the sections are without mechanical movement, c) an overpressure of 5-25 bar is applied within the sections and the further section is reeled onto the pipe laying drum, d) several sections are joined together and reeled onto one or several pipe laying drums by repeating step b) and c) until the predetermined pipeline length is achieved, e) the pipeline is laid from the lay barge onto the seabed using conventional method, whilst an overpressure of 5-25 bar is maintained within the pipeline by means of a pressurised fluid until the pipeline is correctly placed onto the seabed.
2. Method in accordance with claim 1, characterised in that the fluid which is used inside the pipeline or sections thereof, is water.
3. Method in accordance with claim 1 , characterised in that the fluid which is used inside the pipeline or sections thereof, is compressed air.
4. Method in accordance with claim 1, characterised in that the inner metal cladding is an approximately 3mm thick cladding of stainless steel.
5. Method in accordance with claim 1 , characterised in that sections of the pipeline are welded together without an overpressure within the pipeline, as both the pipeline and sections are kept still with no mechanical movement.
6. Method in accordance with claim 1 , characterised in that increased diameter to the pipeline demands an increased overpressure in order to secure the integrity and configuration of the inner corrosive cladding.
PCT/NO2007/000427 2006-12-11 2007-11-30 Method for laying a pipeline having an inner corrosion proof cladding WO2008072970A1 (en)

Priority Applications (9)

Application Number Priority Date Filing Date Title
US12/448,109 US8226327B2 (en) 2006-12-11 2007-11-30 Method for laying a pipeline having an inner corrosion proof cladding
MX2009006163A MX2009006163A (en) 2006-12-11 2007-11-30 Method for laying a pipeline having an inner corrosion proof cladding.
BRPI0720040A BRPI0720040B8 (en) 2006-12-11 2007-11-30 Method for launching a pipe into a seabed from a launch barge
EA200970571A EA014925B1 (en) 2006-12-11 2007-11-30 Method for laying a pipeline having an inner corrosion proof cladding
EP07851986A EP2092160B1 (en) 2006-12-11 2007-11-30 Method for laying a pipeline having an inner corrosion proof cladding
AU2007332207A AU2007332207B2 (en) 2006-12-11 2007-11-30 Method for laying a pipeline having an inner corrosion proof cladding
CA2672210A CA2672210C (en) 2006-12-11 2007-11-30 Method for laying a pipeline having an inner corrosion proof cladding
AT07851986T ATE533917T1 (en) 2006-12-11 2007-11-30 METHOD FOR LAYING A CABLE WITH CORROSION-RESISTANT INNER COVERING
JP2009541251A JP5311672B2 (en) 2006-12-11 2007-11-30 Method of laying a pipeline with a corrosion resistant coating on the inside

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NO20065686 2006-12-11
NO20065886 2006-12-11

Publications (2)

Publication Number Publication Date
WO2008072970A1 true WO2008072970A1 (en) 2008-06-19
WO2008072970A8 WO2008072970A8 (en) 2009-08-13

Family

ID=41091650

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/NO2007/000427 WO2008072970A1 (en) 2006-12-11 2007-11-30 Method for laying a pipeline having an inner corrosion proof cladding

Country Status (12)

Country Link
US (1) US8226327B2 (en)
EP (1) EP2092160B1 (en)
JP (1) JP5311672B2 (en)
AT (1) ATE533917T1 (en)
AU (1) AU2007332207B2 (en)
BR (1) BRPI0720040B8 (en)
CA (1) CA2672210C (en)
EA (1) EA014925B1 (en)
MX (1) MX2009006163A (en)
MY (1) MY150727A (en)
NO (1) NO325936B1 (en)
WO (1) WO2008072970A1 (en)

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CA2672210C (en) 2015-10-27
EP2092160A1 (en) 2009-08-26

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