WO2008068482A1 - Dispositif et procédé de récupération de structures marines - Google Patents

Dispositif et procédé de récupération de structures marines Download PDF

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Publication number
WO2008068482A1
WO2008068482A1 PCT/GB2007/004654 GB2007004654W WO2008068482A1 WO 2008068482 A1 WO2008068482 A1 WO 2008068482A1 GB 2007004654 W GB2007004654 W GB 2007004654W WO 2008068482 A1 WO2008068482 A1 WO 2008068482A1
Authority
WO
WIPO (PCT)
Prior art keywords
lifting
tube
attachment
lifting attachment
recovery
Prior art date
Application number
PCT/GB2007/004654
Other languages
English (en)
Inventor
Owen Baillie Osmotherley
Original Assignee
Oil States Mcs 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 Oil States Mcs Limited filed Critical Oil States Mcs Limited
Publication of WO2008068482A1 publication Critical patent/WO2008068482A1/fr

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D15/00—Handling building or like materials for hydraulic engineering or foundations
    • E02D15/08—Sinking workpieces into water or soil inasmuch as not provided for elsewhere
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63C—LAUNCHING, HAULING-OUT, OR DRY-DOCKING OF VESSELS; LIFE-SAVING IN WATER; EQUIPMENT FOR DWELLING OR WORKING UNDER WATER; MEANS FOR SALVAGING OR SEARCHING FOR UNDERWATER OBJECTS
    • B63C7/00—Salvaging of disabled, stranded, or sunken vessels; Salvaging of vessel parts or furnishings, e.g. of safes; Salvaging of other underwater objects
    • B63C7/16—Apparatus engaging vessels or objects
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
    • B66C1/00—Load-engaging elements or devices attached to lifting or lowering gear of cranes or adapted for connection therewith for transmitting lifting forces to articles or groups of articles
    • B66C1/10—Load-engaging elements or devices attached to lifting or lowering gear of cranes or adapted for connection therewith for transmitting lifting forces to articles or groups of articles by mechanical means
    • B66C1/42—Gripping members engaging only the external or internal surfaces of the articles
    • B66C1/44—Gripping members engaging only the external or internal surfaces of the articles and applying frictional forces
    • B66C1/445—Gripping members engaging only the external or internal surfaces of the articles and applying frictional forces motor actuated
    • B66C1/447—Gripping members engaging only the external or internal surfaces of the articles and applying frictional forces motor actuated by hydraulic or pneumatic motors
    • 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
    • E02B17/0004—Nodal points
    • 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

  • This invention relates to the recovery of structures such as dismantled oil rigs, and more particularly to the recovery from the sea bed of tubular supporting frameworks, in particular the jacket left when the superstructure has been removed.
  • GB 713298 (Pointer et al . ) in figure 6 shows a pneumatic plug inserted into a pile. When the plug is inflated it grips the inside of the pile, which can then be lifted. However, this needs a permanent supply and the plug is prone to wear.
  • a method for recovering a tubular structure comprising the steps of: inserting a lifting attachment into an open end of a tube of the structure, deforming the lifting attachment, preferably permanently and by hydraulic means, to secure it mechanically to the inside of the tube, and lifting the framework by means of a line attached to the lifting attachment.
  • the lifting attachment will itself generally be in the form of a length of metal pipe, of slightly smaller diameter than the structural tube.
  • the pipe can be closed at its insertion end, preferably tapered to ease insertion. It can have one or more attachment lugs or trunnions for the lifting line.
  • the above method can be assisted by a remotely Operated vehicle, guiding the lifting attachment into the open end of the tube, so that the operation can be controlled from the surface. Also, as the attachment (and also the tube to some extent) is being deformed, the amount of deformation can be accurately judged. Furthermore, the deformation of the lifting attachment can be gradually- increased until sufficient engagement with the structure is achieved.
  • a lifting attachment suitable for use in the recovery of a framework by the above method, comprising: a tube having a closed end and an open end, and means for attaching a recovery line; the tube being suitable for receiving an expanding tool through its open end by means of which the tube can be deformed, and having lifting lugs for attaching a lifting line once the lifting attachment is fitted to the structure.
  • the expanding tool is preferably a mandrel having inflatable seals housed on its outer surface, the mandrel having an external diameter such that it fits inside the lifting attachment.
  • a sealed chamber can then be formed between the outer surface of the mandrel, its seals (once inflated) and the inner surface of the lifting tube.
  • the framework has several upwardly extending cut-off tubes a lifting head can be inserted into each, if need be.
  • Fig. 1 shows a crane barge preparing to lift a support structure on the sea bed
  • Fig. 2 shows a lifting attachment about to be inserted into a leg of the structure
  • Fig. 3 shows a detail
  • Fig. 4 shows the expanding tool fully inserted into the lifting attachment, thus forming an assembly
  • Figs. 5A and 5B show the assembled recovery head and tool being inserted into the open end of a leg of the structure
  • Fig. 6 shows the lifting attachment positioned inside the leg
  • Fig. 7 shows the lifting attachment hydraulically expanded into the leg, and Fig. 8 shows the same with the expanding tool removed;
  • Fig. 9 shows tools applied to all the legs.
  • Fig. 10 shows the structure being recovered by a crane barge on the surface.
  • Figure 1 shows a crane barge 40 and a structure 1 in the form of a tubular framework, standing on the seabed 3, to be recovered following removal of the superstructure.
  • Figure 2 shows a lifting attachment 10 of tubular form being lowered by the crane.
  • Figure 3 illustrates how the external diameter of the tube is just less than the internal diameter of the structure to be recovered, so that the tube fits tightly inside the free end 2 of the structure.
  • the lifting attachment is made of steel, like the tubular structure itself.
  • the internal diameter of the tubular lifting attachment 10 is such that an expanding tool 30 can be inserted into it.
  • Figure 4 shows such a tool 30 inserted into the open end 13 of the lifting attachment.
  • the tool 30 comprises a mandrel 31 having inflatable seals 32 housed in circumferential grooves on the surface of the mandrel and spaced apart axially, means for inflating the inflatable seals, and a conduit (not shown) terminating on the exterior of the mandrel between the seals. Further description of the tool is omitted here; a more detailed description of a device of this kind can be found, for example, in British Patent GB 2086969.
  • Figure 4 shows the tool 30 fully inserted into the recovery head 10, with a line 20 attached to the tool 30 for support and hydraulic supply.
  • the seals 32 on the tool are inflated so as to form a sealed annular chamber 25 between the seals 32, the outer surface of the mandrel 31 and the inner surface of the lifting attachment 10. With the annulus pressurised the tool is secured within the lifting attachment.
  • the generally tubular form of the lifting attachment has a conical lower or insertion end 12 and a flange 16 near the upper end. Located above the flange are two lugs or trunnions 14 for attaching a lifting line.
  • the assembled lifting head 10 and tool 30 are subsequently lowered towards and then into the open end 2 of the leg of the jacket. If the end is underwater this operation is performed with the assistance of a remotely operated vehicle, for instance with a camera to observe progress; the insertion is shown in Figures 5A and 5B.
  • Fig. 6 shows an inner view.
  • FIG 7 shows the lifting attachment 10 hydraulically expanded into the structure 1.
  • the expanding tool 30 is no longer required and, following deflation of its seals, is removed from the lifting attachment with the assistance of a ROV, and is then recovered to the crane barge. Then cables 45 are attached to the lugs 14. The situation is now as shown in Figure 8.
  • Fig. 9 shows a lifting frame with a recovery head for each leg, attached by the cables 45 to a jig 50 lifted by the crane barge 40, as shown in Figure 10.
  • the jacket can be floated on pontoons, and the lifting attachments 10 can then be removed.
  • the invention was conceived for use with dismantled jackets but could be used for the recovery of other underwater objects .

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Structural Engineering (AREA)
  • Civil Engineering (AREA)
  • Ocean & Marine Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Mining & Mineral Resources (AREA)
  • Paleontology (AREA)
  • Earth Drilling (AREA)

Abstract

Pour récupérer une structure sous-marine (1) ayant une forme tubulaire, comme l'enveloppe d'un appareil de forage de pétrole mis hors service, une attache de levage (10) est insérée dans l'extrémité libre (2) d'un élément tubulaire de la structure (1) et est ensuite déformée de manière plastique par un formage hydraulique de sorte qu'elle entre en prise mécaniquement et fixement avec l'intérieur de l'élément tubulaire, qui est au moins déformé élastiquement. La structure (1) peut être ensuite récupérée à la surface au moyen de câbles de récupération (45) attachés à un tenon (14) sur l'attache de levage (10). Cela permet d'éviter d'avoir à souder des attaches à la structure.
PCT/GB2007/004654 2006-12-05 2007-12-05 Dispositif et procédé de récupération de structures marines WO2008068482A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB0624325A GB2444498B (en) 2006-12-05 2006-12-05 Apparatus and method for recovery of marine structures
GB0624325.7 2006-12-05

Publications (1)

Publication Number Publication Date
WO2008068482A1 true WO2008068482A1 (fr) 2008-06-12

Family

ID=37711613

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB2007/004654 WO2008068482A1 (fr) 2006-12-05 2007-12-05 Dispositif et procédé de récupération de structures marines

Country Status (2)

Country Link
GB (1) GB2444498B (fr)
WO (1) WO2008068482A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012130807A1 (fr) * 2011-03-25 2012-10-04 Société D'exploitation Du Pieter Schelte N.V. Procédé et système d'accouplement d'une structure en mer à un bloc de levage d'une installation de levage

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB713298A (fr) *
GB2086969A (en) * 1980-09-08 1982-05-19 British Underwater Pipeline Improvements in or relating to the securing of structures to the sea-bed
US4808037A (en) * 1987-02-25 1989-02-28 Franklin C. Wade Method and apparatus for removal of submerged offshore objects
WO1995009280A2 (fr) * 1993-09-30 1995-04-06 Shell Internationale Research Maatschappij B.V. Structures de plate-forme de forage en mer et manchon de pile reutilisable associe a ladite structure
WO2004067854A1 (fr) * 2003-01-28 2004-08-12 Bsw Limited Outil de prehension
US20050252662A1 (en) * 1998-12-22 2005-11-17 Weatherford/Lamb, Inc. Apparatus and method for expanding a tubular

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB713298A (fr) *
GB2086969A (en) * 1980-09-08 1982-05-19 British Underwater Pipeline Improvements in or relating to the securing of structures to the sea-bed
US4808037A (en) * 1987-02-25 1989-02-28 Franklin C. Wade Method and apparatus for removal of submerged offshore objects
WO1995009280A2 (fr) * 1993-09-30 1995-04-06 Shell Internationale Research Maatschappij B.V. Structures de plate-forme de forage en mer et manchon de pile reutilisable associe a ladite structure
US20050252662A1 (en) * 1998-12-22 2005-11-17 Weatherford/Lamb, Inc. Apparatus and method for expanding a tubular
WO2004067854A1 (fr) * 2003-01-28 2004-08-12 Bsw Limited Outil de prehension

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012130807A1 (fr) * 2011-03-25 2012-10-04 Société D'exploitation Du Pieter Schelte N.V. Procédé et système d'accouplement d'une structure en mer à un bloc de levage d'une installation de levage
US9221654B2 (en) 2011-03-25 2015-12-29 Societe D'exploitation Du Pieter Schelte N.V. Method and system for coupling an offshore structure to a hoisting block of a hoisting installation

Also Published As

Publication number Publication date
GB0624325D0 (en) 2007-01-17
GB2444498A (en) 2008-06-11
GB2444498B (en) 2011-04-27

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