EP2070813A2 - Méthode et système pour le démontage des plates-formes en mer - Google Patents

Méthode et système pour le démontage des plates-formes en mer Download PDF

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Publication number
EP2070813A2
EP2070813A2 EP08075925A EP08075925A EP2070813A2 EP 2070813 A2 EP2070813 A2 EP 2070813A2 EP 08075925 A EP08075925 A EP 08075925A EP 08075925 A EP08075925 A EP 08075925A EP 2070813 A2 EP2070813 A2 EP 2070813A2
Authority
EP
European Patent Office
Prior art keywords
vessel
platform
beams
support structure
support
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.)
Withdrawn
Application number
EP08075925A
Other languages
German (de)
English (en)
Other versions
EP2070813A3 (fr
Inventor
Jan-Willem Ouwehand
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Heerema Marine Contractors Nederland BV
Original Assignee
Heerema Marine Contractors Nederland BV
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 Heerema Marine Contractors Nederland BV filed Critical Heerema Marine Contractors Nederland BV
Publication of EP2070813A2 publication Critical patent/EP2070813A2/fr
Publication of EP2070813A3 publication Critical patent/EP2070813A3/fr
Withdrawn legal-status Critical Current

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    • 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
    • B63B35/003—Vessels or similar floating structures specially adapted for specific purposes and not otherwise provided for for transporting very large loads, e.g. offshore structure modules
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02B—HYDRAULIC ENGINEERING
    • E02B17/00—Artificial islands mounted on piles or like supports, e.g. platforms on raisable legs or offshore constructions; Construction methods therefor
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02B—HYDRAULIC ENGINEERING
    • E02B17/00—Artificial islands mounted on piles or like supports, e.g. platforms on raisable legs or offshore constructions; Construction methods therefor
    • E02B2017/0039—Methods for placing the offshore structure
    • E02B2017/0047—Methods for placing the offshore structure using a barge
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02B—HYDRAULIC ENGINEERING
    • E02B17/00—Artificial islands mounted on piles or like supports, e.g. platforms on raisable legs or offshore constructions; Construction methods therefor
    • E02B2017/0052—Removal or dismantling of offshore structures from their offshore location

Definitions

  • the present invention relates to a method and system for removing a part of a platform at sea, the platform resting on a seabed.
  • US2003/0108392 discloses a system for removing decks from offshore structures. A drawback of this system is that it requires two barges, which is expensive and cumbersome during transport.
  • GB2165188 discloses a method for installing and removing an upper part of a platform (called deck module) at sea from a leg assembly of the platform.
  • a disadvantage of the system of GB2165188 is that it comprises a support frame 20 (comprising of girders 51) which is integral with the deck module itself, see Figure 2 and page 1, lines 78-80 of GB2165188 .
  • the support frame 20 is essential to the system, and hence the system of GB2165188 can only by used for removing deck modules having such a support frame 20. Since most existing platforms do not have such a support frame 20, the value of the system of GB2165188 is limited in practice.
  • a disadvantage of the system of GB2165188 is further that it requires barges which extend to a substantial height above the water surface, in order to remove the deck module from the leg assembly. This is due to the fact that for safety reasons, the deck module is located at a substantial height above the water line, and consequently the support structure 20 is also located at a substantial height above the water line.
  • WO98/24980 discloses a system for lifting a sea-going structure.
  • One drawback of this system is that it requires two vessels, which is expensive and cumbersome during transport.
  • Another drawback of this system is that it is difficult to unload the sea-going structure from the vessels once it is lifted with the vessels.
  • At least one of the objects is achieved in a method of removing an upper part of a platform which rests on a seabed and which extends above the waterline, the platform comprising legs which extend upwards from the seabed, the method comprising the subsequent steps of:
  • the method is simple because the support structure is connected directly to the upper part of the platform.
  • the connection may be effected by welding the support structure to the platform.
  • Other types of connections such as bolting or using special coupling members are also possible.
  • the method can be dedicated to removing platforms, and thus can be made free of any requirements or equipment relating to installing such a platform. This further specialization allows a simplification of the system, in contrast with complex systems of the
  • the method may also be used to remove the lower part of the platform or to remove the entire platform at once.
  • the support structure is not fixed to the vessel prior to the moving of the vessel to a position at the platform.
  • the support structure is handed over to the platform in order to eliminate movement of the barge caused by waves and or wind. This can be achieved for instance by laying the support structure into supports connected to the piles before the vessel arrived, or by means of winch wires lowered from the platform deck.
  • the vessel is then ballasted down so that the support beams come free of the barge and can be welded to the platform legs without interference from movement of the vessel during the welding.
  • the vessel After connection of the support beams, the vessel is positioned and de-ballasted until the barge deck makes contact again with the support beams. The vessel is de-ballasted to an extent that the barge presses onto the support beams and thereby movement of the barge is minimized. Then the support beams are welded to the vessel deck.
  • the moment of contact between the vessel and the support beams is critical. Measures may be taken in order to minimize the impact between the structures. For instance shock absorbers may be used. Alternatively a hydraulic system may be used, that can pull the vessel towards the support beam.
  • positioning the vessel between the legs of the platform is performed prior to connecting the connection ends to the legs of the platform.
  • the vessel which has an important function in positioning the support beams.
  • the beams of the support structure are connected to the legs of the platform when the vessel is not present.
  • the vessel may pre-position the support beams and be removed during the connecting of the connection ends to the legs.
  • the vessel may not be involved at all in the connecting of the beams to the legs of the platform.
  • the support beams may be positioned by a crane on the platform itself and the vessel is positioned between the legs of the vessel only after the support structure is connected to the legs.
  • the support structure rests on the deck of the vessel and extends substantially horizontally.
  • the hull of the vessel will generally be elongate and can also be referred to as a mono-hull.
  • the support structure comprises a hydraulic system for raising the one or more beams including the platform relative to the vessel, the method comprising raising the upper part of the platform relative to the vessel by the hydraulic system while at the same time deballasting the vessel.
  • the method comprises:
  • the provisional or preliminary support means may be a ridge, collar or other projection on the legs of the platform on which the support structure is placed and comes to rest.
  • the method comprises:
  • the upper part of the platform is simply rolled off the vessel.
  • the present invention further relates to a system for removing an upper part of a platform which rests on a seabed and which extends above the waterline, the platform comprising legs which extend upwards from the seabed, the system comprising:
  • the present invention also relates to a support structure for use in the method of claim 1 or for use in the system of claim 10.
  • the present invention further relates to a vessel for use in the method of claim 1 or for use in the system of claim 10.
  • the present invention further relates to a docking station for unloading the platform from the vessel, the docking station comprising a bay for the vessel and support members positioned around the bay, the support members being configured to support the support beams of the support structure, thereby allowing the unloading method of:
  • FIGS 1 a and 1 b show the system of GB2165188 and discloses a vessel 70.
  • the platform (or jacket structure) is built with a specific future removal method in mind.
  • the deck module 16 of the platform is provided with a horizontal beam 51.
  • support members 76a are provided at the underside of the beam 51 via which the deck module 16 is removably supported by the leg construction of the platform via support points 24a. This combination of features allows the removal vessel 70 to move between the legs of the jacket.
  • Lifting means 56 are provided which engage with outwardly projecting ends of the beams 51. The deck module 16 is subsequently lifted integrally from the support positions 24a.
  • the method and system of GB2165188 can only be used for platforms which are specifically designed and constructed to be removed with this system. If the platform does not have a beam 51 with outwardly projecting ends or if the platform does not have support points 24 which allow a disconnection of the deck module from the jacket legs, the system of GB2165188 does not work or works only at high costs. See page 1, lines 78-80 of GB2165188 which disclose that the support frame is integral with the deck module. Since most existing platforms do not have such a support frame, the value of the system of GB2165188 is limited in practice.
  • a further disadvantage of the system of GB2165188 is that the deck module including the beams 51 generally is located at a substantial distance above the mean sea level water line in order to stay clear of storm waves. This distance is generally a design requirement for safety purposes of platforms. In that case, the lifting means 56 also need to be provided high above the water line, which is complicated and disadvantageous.
  • FIGS. 1 a and 1 b may need a substantial length in order to reach the girders 51.
  • Figures 2 , 3 and 4 show an embodiment of the platform removal system according to the invention.
  • a vessel or barge 2 is provided having skid means 33 on the deck 46.
  • the barge 2 is substantially elongate and the skid means 33 extend in the longitudinal direction of the barge 2.
  • the skid means 33 may be rails or tracks or simply a path defined on deck 46. Alternatively or additionally, deck supports 33 may be provided.
  • the jacket structure or platform 1 which is to be removed rests on the seabed (not shown) on legs 5.
  • the platform 1 comprises a top module or deck module 6 which is located above the water line 8.
  • the barge 2 has a width 62 which is smaller than the distance 64 between two legs 5 of the platform 1, allowing the barge 2 to be positioned between the legs 5 of the platform 1.
  • the removal system further comprises a support structure 30 comprising one or more beams 31.
  • the beams 31 have ends 32 which are connected to the legs 5 of the platform.
  • the beams 31 are configured to rest on the skid means 33 and are supported in such a way that they can move relative to the barge 2 by sliding or rolling.
  • the vertical distance between the beam 31 and the underside 44 of the deck module 6 may be substantial.
  • the beam 31 may be located substantially below a nominal wave height, whereas the deck 42 and in particular the underside 44 of the deck module 6 is located at a substantial height above the nominal wave height Hs. This feature allows the platform removal system to be relatively low.
  • FIG 3 a front view of the removal system is shown, the barge 2 carrying the upper part of the platform.
  • the beams 31 are connected to the legs 5 at connection points 32.
  • Figure 4 shows the system from the side.
  • the skid means 33 may extend beyond the hull of the barge 2 for easy roll-off or skid-off of the support structure 3 with the upper part of the platform from the barge 2.
  • Figure 5a shows a first step in a method for removing the upper part 11 of a platform 1.
  • Hang-off provisions or support members 4 are connected to the legs 5.
  • the support members 4 may be steel beams or collars which are welded to the legs 5 of the platform 1. This step may be executed prior to the arrival of the barge 2.
  • Figure 5b shows a next step wherein the barge 2 arrives with the beams 31 supported on the deck 46.
  • the beams 31 may be uncoupled from the barge 2.
  • the barge 2 is positioned such that the beams 31 come to rest on the support members 4.
  • the barge 2 is ballasted by filling ballast compartments in order to lower the barge 2 relative to the beams 31.
  • the beams 31 come loose from the barge 2 and are now fully supported by the support members 4.
  • the beams 31 can now be fixed to the legs 5.
  • the beams 31 are lifted relative to the barge 2and placed on support members 4.
  • the barge 2 may not be present during installation of the beams 31 on the support members 4.
  • a crane vessel installs the beams 31, or the beams may be installed by the workers on the platform 1 itself, without the use of an additional vessel.
  • Figure 5d shows that in a next step, the barge 2 is positioned such that the beams 31 engage the skid means 33 on the deck 46.
  • the barge 2 will be deballasted by emptying the ballast compartments 7.
  • connection means extend upwards from the deck 46 of the barge 2 and form a connection between the deck 46 and the beams 31.
  • Figure 5e shows that in a next step, the legs 5 of the platform are cut, such that the platform 1 is divided in an upper part 11 and a lower part 12.
  • the drawing shows that the legs are cut above the water line, alternatively this can be done beneath the water line.
  • Figure 5f shows how in a next step, the barge 22 lifts the upper part 11 from the lower part 12 via the beams 31. This may be performed by further deballasting the barge 2.
  • a further hydraulic lifting system 34 may be provided on deck 46, which may be operated simultaneously with the deballasting. The hydraulic lifting system 34 is configured to move the beams 31 upward relative to the deck and to lower the beams 31 relative to the deck 46.
  • Figure 5g shows a situation in which the upper part 2 is completely removed and the lower part 12 remains behind.
  • the lower part 12 may be removed separately.
  • Figure 6 shows an alternative embodiment, in which carriages 80 are used to unload the upper part 11 of the platform from the barge 2.
  • the upper part may be positioned on the carriages directly after removal from the lower part of the platform, but it is also possible that the upper part is placed on the carriages when the barge arrives at the unloading location.
  • Hydraulic lifting means 34 may be present for lifting the upper part 11 from the deck 46 and onto the carriages 80. The present invention relates to the following clauses:

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Transportation (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Ocean & Marine Engineering (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Earth Drilling (AREA)
  • Drilling And Exploitation, And Mining Machines And Methods (AREA)
  • Foundations (AREA)
EP08075925A 2007-12-10 2008-12-09 Méthode et système pour le démontage des plates-formes en mer Withdrawn EP2070813A3 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US1257007P 2007-12-10 2007-12-10

Publications (2)

Publication Number Publication Date
EP2070813A2 true EP2070813A2 (fr) 2009-06-17
EP2070813A3 EP2070813A3 (fr) 2010-11-03

Family

ID=40482001

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08075925A Withdrawn EP2070813A3 (fr) 2007-12-10 2008-12-09 Méthode et système pour le démontage des plates-formes en mer

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US (1) US20090148241A1 (fr)
EP (1) EP2070813A3 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL2006407C2 (en) * 2011-03-16 2012-09-18 Heerema Marine Contractors Nl Method for removing a hydrocarbon production platform from sea.

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8708604B2 (en) * 2011-09-20 2014-04-29 Technip France Quick release system for topsides float-over installation on offshore platforms
CN103469775B (zh) * 2013-09-05 2015-07-08 中交第二航务工程局有限公司 水上可移动升降式多功能工作平台
CN107084784B (zh) * 2016-12-21 2019-08-23 中国船舶重工集团公司第七一0研究所 一种移动式可升降四体船型水下测量平台
CN113353202B (zh) * 2020-03-04 2022-11-29 中国电建集团华东勘测设计研究院有限公司 一种海上换流站的浮托式安装结构及方法
CN113513005B (zh) * 2021-04-22 2022-08-26 杜同 海上浮岛
CN115158594A (zh) * 2022-08-18 2022-10-11 上海外高桥造船有限公司 艉部进舱平台及其安装方法

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2165188A (en) 1985-06-05 1986-04-09 Heerema Engineering Installation and removal vessel
WO1998024980A1 (fr) 1996-12-03 1998-06-11 Allseas Group S.A. Dispositif et procede de levage d'une structure de haute mer, comme par exemple une plate-forme de forage
US20030108392A1 (en) 2000-01-17 2003-06-12 Mccarthy Vincent George Removal of decks from offshore structures

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL7710267A (nl) * 1977-09-19 1979-03-21 Ir Arie Van Der Landen Werkwijze voor het opbouwen van een marinecon- structie en voor het opbouwen en transporteren van de bovenbouw daarvan, en vaartuig ten gebrui- ke daarbij.
FR2405182A1 (fr) * 1977-10-04 1979-05-04 Metalliques Entrepr Cie Fse Procede et equipement pour la mise en place sur colonnes ancrees au fond, a partir d'un navire transporteur, de chargements, plates-formes ou analogues, pour installations au large des cotes
US5037241A (en) * 1990-03-29 1991-08-06 Exxon Production Research Company Method and apparatus for setting a superstructure onto an offshore platform
US5553977A (en) * 1994-12-16 1996-09-10 Northrop Grumman Corporation Off-shore platform construction, and method for transferring loads
FR2779754B1 (fr) * 1998-06-12 2000-08-25 Technip Geoproduction Dispositif de transport et de pose d'un pont d'une plate-forme petroliere d'exploitation en mer
NO313130B1 (no) * 1999-06-07 2002-08-19 Mpu Entpr As Anordning for posisjonering og löfting av en marin konstruksjon, s¶rlig et plattformdekk
US6719495B2 (en) * 2000-06-21 2004-04-13 Jon E. Khachaturian Articulated multiple buoy marine platform apparatus and method of installation
US6871609B2 (en) * 2002-08-30 2005-03-29 Itrec B.V. Multipurpose tower for monohull

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2165188A (en) 1985-06-05 1986-04-09 Heerema Engineering Installation and removal vessel
WO1998024980A1 (fr) 1996-12-03 1998-06-11 Allseas Group S.A. Dispositif et procede de levage d'une structure de haute mer, comme par exemple une plate-forme de forage
US20030108392A1 (en) 2000-01-17 2003-06-12 Mccarthy Vincent George Removal of decks from offshore structures

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL2006407C2 (en) * 2011-03-16 2012-09-18 Heerema Marine Contractors Nl Method for removing a hydrocarbon production platform from sea.
EP2500259A1 (fr) * 2011-03-16 2012-09-19 Heerema Marine Contractors Nederland B.V. Procédé pour supprimer une plateforme de production d'hydrocarbures en mer
US9109406B2 (en) 2011-03-16 2015-08-18 Heerema Marine Contractors Nederland Se Method for removing a hydrocarbon production platform from sea

Also Published As

Publication number Publication date
EP2070813A3 (fr) 2010-11-03
US20090148241A1 (en) 2009-06-11

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