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WO2009070034A2 - Method for picking up and towing a structure under water - Google Patents

Method for picking up and towing a structure under water Download PDF

Info

Publication number
WO2009070034A2
WO2009070034A2 PCT/NO2008/000423 NO2008000423W WO2009070034A2 WO 2009070034 A2 WO2009070034 A2 WO 2009070034A2 NO 2008000423 W NO2008000423 W NO 2008000423W WO 2009070034 A2 WO2009070034 A2 WO 2009070034A2
Authority
WO
WIPO (PCT)
Prior art keywords
vessel
seabed
installation
weight
winch
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.)
Ceased
Application number
PCT/NO2008/000423
Other languages
French (fr)
Other versions
WO2009070034A3 (en
Inventor
Peter H. Vik
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.)
Subsea 7 Norway NUF
Original Assignee
Subsea 7 Norway NUF
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 Subsea 7 Norway NUF filed Critical Subsea 7 Norway NUF
Publication of WO2009070034A2 publication Critical patent/WO2009070034A2/en
Publication of WO2009070034A3 publication Critical patent/WO2009070034A3/en
Anticipated expiration legal-status Critical
Priority to NO20100922A priority Critical patent/NO339406B1/en
Ceased legal-status Critical Current

Links

Classifications

    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B27/00—Arrangement of ship-based loading or unloading equipment for cargo or passengers
    • B63B27/10—Arrangement of ship-based loading or unloading equipment for cargo or passengers of cranes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B3/00—Hulls characterised by their structure or component parts
    • B63B3/14—Hull parts
    • B63B2003/147—Moon-pools, e.g. for offshore drilling vessels

Definitions

  • the invention relates to a method for establishing and implementing towing of a structure under water as indicated in the introduction to the appended claim 1.
  • AkerKvsrner has applied for a patent for a towing method based on the weight of the structure being suspended in the water under an upright finger buoy towed behind the vessel. For installation in the field, the buoy first has to be brought aboard the vessel before the structure can be lowered to the seabed by a winch, which is passed over the stern of the vessel.
  • This method is robust as far as towing speed is concerned, but weather-sensitive for an operation in the field. The method does not feature rotation control of the structure during towing.
  • Another towing method makes use of a supporting beam projecting from the side of the vessel, where the structure is suspended on the supporting beam and towed under water out to the field. Installation is accomplished by a crane being connected to the structure, which is lifted off the supporting beam and then lowered for installation.
  • the method is robust as far as weather criteria for towing and installation are concerned, but the weight of the structure is limited by the capacity of the crane.
  • the object of the present invention is to provide a method for operating towing of structures including those of great weight and different hydrodynamic properties, which method is robust with regard to weather criteria and installation.
  • the present application relates to a method for establishing and implementing towing of a structure under water, and the method is characterised by the characteristics set forth in the patent claims.
  • Fig. IA illustrates a section of a vessel 10 viewed from behind, where a truss 3 is attached to lifting points 4 on a structure 1 which is under tow, centred below the vessel through a moon pool 1 1.
  • Fig. IB illustrates a side section of the vessel 10, where the structure 1 is suspended in the truss 3 under a superstructure 12 by a winch 13 manipulating a wire 14 via a snatch block 15.
  • a guide line 2 which is passed from the vessel's forward part to a calibrated guide weight 5 and on to the structure 1 , helps to guide the structure 1 forwards through the water, preventing the structure 1 from swerving or performing rotating movements.
  • the structure 1 is attached to the superstructure 12 via a static rigging 16, and during this phase wire 14 is not loaded.
  • Two sets of rigging go to the structure 1 ; a wire 14 and a static wire 16.
  • the structure 1 is lifted by the wire 14, and when the static wire 16 is connected to the superstructure 12, it is paid out on the winch 13, thereby causing the load to be passed from the winch's 13 wire 14 to static wire 16.
  • the structure 1 is towed to the location suspended in static rig wire 16.
  • the static wire 16 is then disconnected from the superstructure 12, thereby enabling the structure 1 to be installed by the wire being paid out on the winch 13.
  • Fig. 2 illustrates a corresponding side section, where the structure 1 is being lowered to the seabed by a guide weight 17 together with the assistance of an ROV 18 in order to achieve correct localization.
  • Fig. 3 illustrates a side section of a detail of load transmission from the winch 13 via the wire 14 over the superstructure 12 to the snatch block 15, and with the static rigging 16 from the superstructure 12.
  • the method is based on the structure 1 being suspended in the superstructure 12 over a moon pool 1 1 vertically through the vessel 10, where the orientation of the structure 1 during the tow to the field is controlled by means of an active or passive elastic guide line 2 with a calibrated guide weight 5 attached to the structure 1 from the forward part of the vessel 10.
  • a Remotely Operated Vehicle - ROV 18 is used. • The vessel is towed over the structure 1 , which is parked on the seabed.
  • a lifting truss 3 is lowered down to the structure 1 and connected to lifting points 4.
  • a winch 13 with wire 14 suspended in the superstructure 12 via a snatch block 15 takes the weight of the structure 1 and lifts it from the seabed.
  • a static wire 16 is connected to attachment points on the superstructure 12. • The winch 13 lowers the structure 1 , and the weight is transferred to static wire 16.
  • a guide line 2 is passed from the vessel's 10 forward part to a guide weight 5 and on to the structure 1 , whereupon towing to the field starts.
  • the vessel's 10 speed is adjusted to suit the permitted sea state and the structure's 1 and the vessel's 10 hydrodynamic properties.
  • the vessel's 10 direction in relation to the towing direction is adjusted in such a manner that the vessel 10 with a plurality of rotatable thrusters ensures that the vessel 10 either has the bow or the stern facing into the wind and wave direction. • On arrival at the field, the installation of the structure 1 is started.
  • the winch 13 takes the weight of the structure 1 , and the static wire 16 is slackened off, disconnected from the superstructure 12 and lowered into the water.
  • the winch 13 lowers the structure 1 by the wire 14 down to the seabed.
  • the structure Before a tow is initiated, the structure is parked on the seabed by the yard's/workshop's crane barge.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Ocean & Marine Engineering (AREA)
  • Underground Structures, Protecting, Testing And Restoring Foundations (AREA)
  • Revetment (AREA)
  • Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)
  • Gloves (AREA)

Abstract

The invention relates to a method for establishing and implementing towing of a structure (1) under water by means of a vessel (10) with a moon pool (11) and a superstructure (12). The vessel (10) is towed over the structure (1), a lifting truss (3) is connected to lifting points (4), a winch (13) with wire (14) via snatch block (15) suspended in the superstructure (12) takes the load and lifts structure (1) from the seabed, and moves to deeper water. A static wire (16) is connected to superstructure (12), and a guide line (2) with a calibrated guide weight (5) connected to the structure (1), is passed to the vessel's (10) forward part, and towing starts. Installation is started by the winch (13) taking the load, static wire (16) is slackened off, disconnected from the superstructure (12) and lowered. The guide line (2) with the guide weight (5) are disconnected. An installation weight (17) is connected to the structure (1), in order together with an ROV (18) to manipulate and control the direction of the structure (1) during installation. The winch (13) lowers the structure (1) down to the seabed, and wire (14) with installation weight (17) is disconnected and lifted up, whereby the installation is complete.

Description

METHOD FOR PICKING UP AND TOWING A STRUCTURE UNDER MATER
The invention relates to a method for establishing and implementing towing of a structure under water as indicated in the introduction to the appended claim 1.
There is a need for the installation of increasingly larger and heavier prefabricated structures on the seabed in connection with offshore oil and gas production. These structures in various forms are normally installed by cranes on vessels with substantial crane capacity after completion of an underwater tow.
From the patent literature we cite the following as background documentation:
- EP 345.157 Al describes a method for raising and towing a structure under water by means of a vessel with a moon pool vertically through the vessel, where the load is suspended from a winch by a cable to the bottom of the ship's hull for towing the load. Between the load and the vessel's hull there is provided a bell-shaped receiver unit, which is arranged to receive the load and protect it during towing.
- US 2004/0089215 Al describes a method for transport and installation of a structure by means of a vessel with a moon pool vertically through the vessel, where the structure is lifted into the vessel before transport begins.
AkerKvsrner has applied for a patent for a towing method based on the weight of the structure being suspended in the water under an upright finger buoy towed behind the vessel. For installation in the field, the buoy first has to be brought aboard the vessel before the structure can be lowered to the seabed by a winch, which is passed over the stern of the vessel. This method is robust as far as towing speed is concerned, but weather-sensitive for an operation in the field. The method does not feature rotation control of the structure during towing.
Another towing method makes use of a supporting beam projecting from the side of the vessel, where the structure is suspended on the supporting beam and towed under water out to the field. Installation is accomplished by a crane being connected to the structure, which is lifted off the supporting beam and then lowered for installation. The method is robust as far as weather criteria for towing and installation are concerned, but the weight of the structure is limited by the capacity of the crane.
In order to achieve a successful tow at normal speed, it is crucial that the structure should not be able to rotate or swerve, and that the vessel's pitching motion in the water should not overload the suspension or in any way damage the structures.
The object of the present invention is to provide a method for operating towing of structures including those of great weight and different hydrodynamic properties, which method is robust with regard to weather criteria and installation. The present application relates to a method for establishing and implementing towing of a structure under water, and the method is characterised by the characteristics set forth in the patent claims.
Fig. IA illustrates a section of a vessel 10 viewed from behind, where a truss 3 is attached to lifting points 4 on a structure 1 which is under tow, centred below the vessel through a moon pool 1 1.
Fig. IB illustrates a side section of the vessel 10, where the structure 1 is suspended in the truss 3 under a superstructure 12 by a winch 13 manipulating a wire 14 via a snatch block 15. A guide line 2, which is passed from the vessel's forward part to a calibrated guide weight 5 and on to the structure 1 , helps to guide the structure 1 forwards through the water, preventing the structure 1 from swerving or performing rotating movements.
During towing the structure 1 is attached to the superstructure 12 via a static rigging 16, and during this phase wire 14 is not loaded. Two sets of rigging go to the structure 1 ; a wire 14 and a static wire 16. Firstly, the structure 1 is lifted by the wire 14, and when the static wire 16 is connected to the superstructure 12, it is paid out on the winch 13, thereby causing the load to be passed from the winch's 13 wire 14 to static wire 16. The structure 1 is towed to the location suspended in static rig wire 16. At the location the winch 13 winds in the wire, and wire 14 takes over the load once more. The static wire 16 is then disconnected from the superstructure 12, thereby enabling the structure 1 to be installed by the wire being paid out on the winch 13.
Fig. 2 illustrates a corresponding side section, where the structure 1 is being lowered to the seabed by a guide weight 17 together with the assistance of an ROV 18 in order to achieve correct localization.
Fig. 3 illustrates a side section of a detail of load transmission from the winch 13 via the wire 14 over the superstructure 12 to the snatch block 15, and with the static rigging 16 from the superstructure 12.
The method is based on the structure 1 being suspended in the superstructure 12 over a moon pool 1 1 vertically through the vessel 10, where the orientation of the structure 1 during the tow to the field is controlled by means of an active or passive elastic guide line 2 with a calibrated guide weight 5 attached to the structure 1 from the forward part of the vessel 10. During the installation a Remotely Operated Vehicle - ROV 18 is used. • The vessel is towed over the structure 1 , which is parked on the seabed.
• A lifting truss 3 is lowered down to the structure 1 and connected to lifting points 4. • A winch 13 with wire 14 suspended in the superstructure 12 via a snatch block 15 takes the weight of the structure 1 and lifts it from the seabed.
• The vessel 10 is moved to deeper water.
• A static wire 16 is connected to attachment points on the superstructure 12. • The winch 13 lowers the structure 1 , and the weight is transferred to static wire 16.
• A guide line 2 is passed from the vessel's 10 forward part to a guide weight 5 and on to the structure 1 , whereupon towing to the field starts.
• The vessel's 10 speed is adjusted to suit the permitted sea state and the structure's 1 and the vessel's 10 hydrodynamic properties.
• The vessel's 10 direction in relation to the towing direction is adjusted in such a manner that the vessel 10 with a plurality of rotatable thrusters ensures that the vessel 10 either has the bow or the stern facing into the wind and wave direction. • On arrival at the field, the installation of the structure 1 is started.
• The winch 13 takes the weight of the structure 1 , and the static wire 16 is slackened off, disconnected from the superstructure 12 and lowered into the water.
• The guide line 2 with the guide weight 5 is disconnected from the structure 1. • An installation weight 17 can be connected to the structure 1 by the vessel's
10 crane in order together with an ROV to manipulate and control the direction of the structure 1 during installation.
• The winch 13 lowers the structure 1 by the wire 14 down to the seabed.
• The structure 1 lands on the seabed, and by means of the winch 13 the wire 14 is slackened off, disconnected from the structure 1 and lifted up to the vessel
10.
• The installation weight 17 is disconnected from the structure 1 and the installation is complete.
Before a tow is initiated, the structure is parked on the seabed by the yard's/workshop's crane barge.

Claims

1. A method for establishing and implementing towing of a structure (1) under water by means of a vessel (10) with a moon pool (1 1) vertically through the vessel, characterised in that the vessel (10) is towed over the structure (1) which is parked on the seabed, a wire (14) connected with a winch (13) runs over a snatch block (15) to a lifting truss (3) in the moon pool (1 1 ), which snatch block (15) is suspended in a superstructure (12) over the moon pool (1 1), the lifting truss (3) is lowered down to the structure (1) and connected to the structure's lifting points (4), the winch (13) then takes the weight of the structure (1) via the snatch block (15) in the superstructure (12) and lifts the structure (1) from the seabed, the vessel is moved to an area with the desired position for the structure, on arrival at the field the structure (1) is installed by the winch (13) lowering the structure (1) down to the seabed, when the structure (1) lands on the seabed, the wire (14) is slackened off by the winch (13) and the lifting truss is disconnected from the structure
(1).
2. A method according to claim 1 , characterised in that a static wire (16) connected to the structure (1) is connected to attachment points on the superstructure (12) when the structure is lifted from the seabed, and before lowering to the seabed, the winch (13) takes the weight of the structure (1), whereupon the static wire (16) is slackened off and disconnected from the superstructure (12) before the structure is lowered to the seabed.
3. A method according to claim 2, characterised in that after the wire (14) has taken the load, but before the static wire (16) is connected, the vessel (10) is moved to deeper water.
4. A method according to claim 1 , characterised in that a guide line (2) is connected between the vessel's (10) forward part and the structure (1), before towing to the field starts.
5. A method according to claim 4, characterised in that a calibrated guide weight (5) is provided in connection with the guide line (2).
6. A method according to claim 4, characterised in that the guide line (2) is disconnected from the structure (1 ) before lowering the structure (1 ) to the bottom.
7. A method according to claim 1 , characterised in that a remotely operated underwater vehicle (ROV) (18) is employed during one or more of the operations; establishment of a connection, towing or installation of the structure (1) on the seabed.
8. A method according to claim 1 , characterised in that an installation weight (17) can be connected to the structure (1 ), in order together with an ROV (18) to manipulate and control the direction of the structure (1 ) during installation, whereupon the installation weight (17) is disconnected from the structure (1) after installation.
9. A method according to claim 1, characterised in that the installation weight (17) can be connected to the structure (1 ) by the vessel's (10) crane.
10. A method according to claim 1 , characterised in that the vessel's (10) speed is adapted to suit permitted sea state and the structure's (1 ) and the vessel's (10) hydrodynamic properties.
1 1. A method according to claim 1, characterised in that the vessel's (10) direction of travel is adjusted in relation to the towing direction in such a manner that the vessel (10) has its bow or stern heading into the wind and wave direction.
12. A method according to claim 1 , characterised in that the lifting truss (3) is brought up to the vessel after being disconnected.
13. A method for establishing and implementing towing of a structure (1) under water by means of a vessel (10) with a moon pool (1 1) vertically through the vessel, together with use of a remotely operated underwater vehicle (18) during installation of the structure (1 ) on the seabed, characterised in that a superstructure (12) is mounted over the moon pool (1 1 ), where the vessel (10) is towed over the structure (1) which is parked on the seabed, a lifting truss (3) is lowered down to the structure
(1 ) and connected to lifting points (4), a winch (13) with wire (14) via a snatch block (15) suspended in the superstructure (12) takes the weight of the structure (1) and lifts it from the seabed, whereupon the vessel is moved to deeper water, a static wire (16) is connected to attachment points on the superstructure (12), and a guide line (2) is passed from the vessel's (10) forward part to a calibrated guide weight (5) and on to the structure (1), whereupon towing to the field starts, the vessel's (10) speed is adapted to suit permitted sea state and the structure's (1) and the vessel's (10) hydrodynamic properties, the vessel's (10) direction of travel is adjusted in relation to the towing direction in such a manner that the vessel (10) has its bow or stern facing into the wind and wave direction, on arrival at the field the installation of the structure (1) is started by the winch (13) taking the weight of the structure (1) and the static wire (16) is slackened off, disconnected from the superstructure (12) and lowered into the water, the guide line (2) with the guide weight (5) are disconnected from the structure (1 ), an installation weight (17) can be connected to the structure (1) by the vessel's (10) crane, in order together with an ROV (18) to manipulate and control the direction of the structure (1 ) during installation, the winch (13) lowers the structure (1) down to the seabed, the structure (1) lands on the seabed and by means of the winch (13) the wire (14) is slackened off, disconnected from the structure (1) and lifted up to the vessel (10), the installation weight (17) is disconnected from the structure (1) and the installation is complete.
PCT/NO2008/000423 2007-11-26 2008-11-26 Method for picking up and towing a structure under water Ceased WO2009070034A2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
NO20100922A NO339406B1 (en) 2007-11-26 2010-06-25 Procedure for establishing and carrying out tow of a structure underwater

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NO20076111 2007-11-26
NO20076111 2007-11-26

Publications (2)

Publication Number Publication Date
WO2009070034A2 true WO2009070034A2 (en) 2009-06-04
WO2009070034A3 WO2009070034A3 (en) 2009-12-30

Family

ID=40510562

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/NO2008/000423 Ceased WO2009070034A2 (en) 2007-11-26 2008-11-26 Method for picking up and towing a structure under water

Country Status (2)

Country Link
NO (1) NO339406B1 (en)
WO (1) WO2009070034A2 (en)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101913417A (en) * 2010-06-01 2010-12-15 上海海事大学 A giant seabed salvage grab
CN102717877A (en) * 2012-06-21 2012-10-10 中国水产科学研究院渔业机械仪器研究所 Stabilizing structure of floater salvaging device
WO2012143392A2 (en) 2011-04-18 2012-10-26 Siemens Aktiengesellschaft Pump system, method and uses for transporting injection water to an underwater injection well
WO2013073950A1 (en) * 2011-11-18 2013-05-23 W. Giertsen As Vessel and method for towing a heavy load under water
WO2014060741A3 (en) * 2012-10-16 2014-06-12 Mojo Maritime Limited Improvements in or relating to marine operations
GB2510772A (en) * 2011-12-06 2014-08-13 Apple Inc Near-field null and beamforming
US8992127B2 (en) 2008-10-24 2015-03-31 Subsea Deployment Systems Limited Method and apparatus for subsea installations
CN104787270A (en) * 2015-04-13 2015-07-22 王梓骅 Synchronizing detection device for shallow water detection
US10267124B2 (en) 2016-12-13 2019-04-23 Chevron U.S.A. Inc. Subsea live hydrocarbon fluid retrieval system and method

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB670511A (en) * 1948-04-30 1952-04-23 Centre Nat Rech Scient Improved device for transporting and handling loads at sea
FR2632269B1 (en) * 1988-06-02 1995-01-20 France Etat Armement DEVICE FOR SECURING A LOAD TO A BUILDING
NO316168B1 (en) * 2002-03-06 2003-12-22 Aker Marine Contractors As Procedure for transporting and installing objects at sea
US6871609B2 (en) * 2002-08-30 2005-03-29 Itrec B.V. Multipurpose tower for monohull
DE20308850U1 (en) * 2003-06-02 2003-08-28 Zache, Lothar, 16556 Borgsdorf Catamaran for ship salvage and oil platform disposal includes range of control, lifting and grappling systems
US7527006B2 (en) * 2006-03-29 2009-05-05 Jon Khachaturian Marine lifting apparatus

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8992127B2 (en) 2008-10-24 2015-03-31 Subsea Deployment Systems Limited Method and apparatus for subsea installations
CN101913417A (en) * 2010-06-01 2010-12-15 上海海事大学 A giant seabed salvage grab
CN101913417B (en) * 2010-06-01 2015-09-09 上海海事大学 A kind of giant undersea salvage grab bucket
WO2012143392A2 (en) 2011-04-18 2012-10-26 Siemens Aktiengesellschaft Pump system, method and uses for transporting injection water to an underwater injection well
WO2013073950A1 (en) * 2011-11-18 2013-05-23 W. Giertsen As Vessel and method for towing a heavy load under water
GB2510772A (en) * 2011-12-06 2014-08-13 Apple Inc Near-field null and beamforming
CN102717877A (en) * 2012-06-21 2012-10-10 中国水产科学研究院渔业机械仪器研究所 Stabilizing structure of floater salvaging device
WO2014060741A3 (en) * 2012-10-16 2014-06-12 Mojo Maritime Limited Improvements in or relating to marine operations
CN104787270A (en) * 2015-04-13 2015-07-22 王梓骅 Synchronizing detection device for shallow water detection
US10267124B2 (en) 2016-12-13 2019-04-23 Chevron U.S.A. Inc. Subsea live hydrocarbon fluid retrieval system and method

Also Published As

Publication number Publication date
NO339406B1 (en) 2016-12-12
WO2009070034A3 (en) 2009-12-30
NO20100922L (en) 2010-08-26

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