EP2490931A1 - Verfahren zur lösung einer boje von einem schiff und vorrichtung zur anwendung damit - Google Patents

Verfahren zur lösung einer boje von einem schiff und vorrichtung zur anwendung damit

Info

Publication number
EP2490931A1
EP2490931A1 EP09748290A EP09748290A EP2490931A1 EP 2490931 A1 EP2490931 A1 EP 2490931A1 EP 09748290 A EP09748290 A EP 09748290A EP 09748290 A EP09748290 A EP 09748290A EP 2490931 A1 EP2490931 A1 EP 2490931A1
Authority
EP
European Patent Office
Prior art keywords
buoy
mooring
turret
gripper means
vessel
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.)
Granted
Application number
EP09748290A
Other languages
English (en)
French (fr)
Other versions
EP2490931B1 (de
Inventor
Richard Leeuwenburgh
Patrizio Giovanni Matia Ottolini
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.)
Bluewater Energy Services BV
Original Assignee
Bluewater Energy Services 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 Bluewater Energy Services BV filed Critical Bluewater Energy Services BV
Publication of EP2490931A1 publication Critical patent/EP2490931A1/de
Application granted granted Critical
Publication of EP2490931B1 publication Critical patent/EP2490931B1/de
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B21/00—Tying-up; Shifting, towing, or pushing equipment; Anchoring
    • B63B21/50—Anchoring arrangements or methods for special vessels, e.g. for floating drilling platforms or dredgers
    • B63B21/507—Anchoring arrangements or methods for special vessels, e.g. for floating drilling platforms or dredgers with mooring turrets
    • B63B21/508—Anchoring arrangements or methods for special vessels, e.g. for floating drilling platforms or dredgers with mooring turrets connected to submerged buoy

Definitions

  • the invention firstly relates to a method for disconnecting a buoy from a turret in an arrangement with a vessel of the type comprising a turret mounted rotatably in the vessel and a buoy supporting risers which is lockable to and disconnectable from the turret, the arra.nc7em.ent further comprising mooring lines connecting the buoy with mooring points on the seabed and loading the buoy with mooring forces .
  • Vessels of the type referred to above are used in offshore oil and. gas fields. Under normal circumstances the turret and buoy are kept in a connected state and the vessel is free to weathervane around, the turret under influence of external factors, such as currents, waves and wind. When the need arises the buoy may be disconnected from the turret and the vessel may travel to a different gripper means. Actual disconnection and (re) connection activities can be achieved in relative limited time, whereas the moment of reconnection and sometimes the moment of disconnection is typically constrained by external factors such as current and waves.
  • the pack ice pushing against the vessel creates enormous mooring forces in the mooring lines which, at the moment of disconnecting the buoy from the turret, act on the buoy in such a manner that it may be jammed in the turret and/or that uncontrolled movements of the buoy may occur with the risk of damaging parts of the construction, such as for example the risers.
  • the method is characterised in that starting before disconnect ⁇ ing the buoy from the turret the mooring lines are manipulated such that at least during the moment of disconnecting the buoy from the turret the mooring forces are lowered or even substantially eliminated.
  • the manipulation of the mooring lines comprises allowing the mooring lines to increase their effective length, which is defined as the maximum distance between the buoy and a respective mooring point allowed by a mooring line. During such an increase the mooring forces temporarily are reduced/eliminated.
  • the increase of effective length may be achieved when, in accordance with a special embodiment, each mooring line extends through a hold and release device and is held thereby at two distanced gripper means with an excess length of mooring line between said two distanced gripper means, and wherein the mooring line for the. increase of its effective length is released at one gripper means for giving out the excess length of mooring line.
  • the hold and release device may be anchored to the seabed, wherein the mooring line for the increase of its effective length is released at the gripper means closest to the buoy.
  • the hold and release device may be mounted to the buoy, wherein the mooring line for the increase of its effective length is released at the gripper means closest, to the mooring point.
  • the buoy comprises a first, buoy part to which the mooring lines are connected and a second buoy part to which the risers are connected and which is provided with auxiliary moorincj lines, wherein pre ⁇ vious to manipulating the mooring lines the second buoy part is released from and lowered relative to the first buoy part .
  • connection between the turret and buoy when connected, is water tight and wherein previous to said manipulation of the mooring lines water is pumped into the turret above the buoy, and preferably until a level above sea level.
  • This water generates a large downward force on the buoy assisting in moving the buoy downward after the disconnection has occurred.
  • Use of this water pressure accelerates the increase in distance between the buoy and the vessel and therefore limits the probability of the buoy and vessel to collide directly after separation from each other.
  • the invention in a second aspect relates to a hold and release device for use in a method for disconnecting a buoy from a turret in an arrangement with a vessel of the type comprising a turret mounted rotatably in the vessel and a buoy supporting risers which is iockabie to and discon- nectabie from the turret, the arrangement further comprising mooring lines connecting the buoy with mooring points on the seabed, said device comprising a housing with at least two distanced mooring line gripper means constructed such that an excess length of mooring line may be positioned therebetween and wherein at least one gripper means is adapted to be brought in a state disengaging the mooring line.
  • the gripper means may be constructed in many dif- ferent ways, for example as hydraulically operated grippers. It should be kept in mind that the mooring forces are trans ⁇ mitted through these gripper means which therefore have to withstand, large forces.
  • the hold and release device may be adapted to be mounted to the buoy or may be adapted to be anchored to the sea bed.
  • Fig. 1 schematically shows a first embodiment, of an assembly for carrying out a method according to the present invention
  • Fig. 2 schematically shows a second embodiment of an assembly for carrying out a method according to the present invention.
  • a vessel 1 is represented of the type comprising a turret 2 mounted rotatably (by bearings 3 and 4 ⁇ in the vessel and a buoy 5 supporting ris ⁇ ers 6.
  • the buoy 5 is lockable to and disconnectable from the turret 2.
  • mooring lines 8 connecting the buoy 5 with mooring points 9 (anchors or piles) on the seabed 10 and loading the buoy with mooring forces .
  • a hold and release device 11 comprises a housing
  • the device 11 is adapted to be anchored to the sea bed 10 (in an alternative embodiment it could be adapted to be mounted to the buoy 5) .
  • the gripper means 13 is adapted to be brought in a state disengaging the mooring line 8,
  • the assembly operates as follows.
  • the mooring lines starting before disconnecting the buoy from the turret, are manipulated such that at least during the moment of disconnecting the buoy 5 from, the turret 2 the mooring forces are lowered or even substantially eliminated. This is achieved by allowing the mooring lines to increase their effective length, which is defined as the maximum dis ⁇ tance between the buoy 5 and a respective mooring point 9 allowed by a mooring line 8.
  • connection between the turret 2 and buoy 5, when connected is water tight. Then one can, previous to said manipulation of the mooring lines and disconnection of the buoy, pump water into the turret 2 above the buoy 5, preferably until a level above sea level. The water pressure then assists in the release of the buoy from the turret.
  • Reconnecting the buoy 5 to the turret may be achieved in the following manner: the mooring lines 8 firstly are repositioned in the hold and release devices 11 between the gripper means 13 and 14 ⁇ with the excess length 15 restored) .
  • a wildcat may be associated with gripper means 13 to pay back released mooring line between gripper means 13 and 14.
  • a hoisting wire connected to a turret mounted winch (not illustrated) will be lowered and connected to th buoy hovering in the water.
  • the buoy 5 is hoisted with its upper section 7 into a corresponding recess of the turret and is locked.
  • the turret is pumped dry and the ris ers are reconnected to corresponding piping within the turret ,
  • Figure 2 relates to an alternative embodiment in which the buoy 5 comprises a first buoy part 5 f to which the mooring lines 8 are connected and a second buoy part 5" to which the risers 6 are connected and which is provided with auxiliary mooring lines 16.
  • the operation of this alterna ⁇ tive embodiment is such that, previous to manipulating the mooring lines 8 as explained above with respect to figure 1, the second buoy part 5" is released from and lowered relative to the first buoy part 5' .
  • the hold and release device for example, might be constructed in such a manner that the respective mooring line is severed, fully in case of an emergency situation, for ex ⁇ ample by devising gripper means 14 as a break, element.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Ocean & Marine Engineering (AREA)
  • Earth Drilling (AREA)
  • Laying Of Electric Cables Or Lines Outside (AREA)
  • Catching Or Destruction (AREA)
EP09748290.5A 2009-10-23 2009-10-23 Verfahren zur lösung einer boje von einem schiff und vorrichtung zur anwendung damit Not-in-force EP2490931B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2009/063987 WO2011047736A1 (en) 2009-10-23 2009-10-23 Method for disconnecting a buoy from a vessel and device for use therewith

Publications (2)

Publication Number Publication Date
EP2490931A1 true EP2490931A1 (de) 2012-08-29
EP2490931B1 EP2490931B1 (de) 2015-12-23

Family

ID=42633136

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09748290.5A Not-in-force EP2490931B1 (de) 2009-10-23 2009-10-23 Verfahren zur lösung einer boje von einem schiff und vorrichtung zur anwendung damit

Country Status (5)

Country Link
EP (1) EP2490931B1 (de)
CA (1) CA2778285C (de)
DK (1) DK2490931T3 (de)
RU (1) RU2508222C2 (de)
WO (1) WO2011047736A1 (de)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE536217C2 (sv) * 2012-08-24 2013-07-02 Förfarande för förankring av farkost samt anordning härför
GB2551379B (en) * 2016-06-16 2018-12-12 Acergy France SAS Upgrading subsea foundations of mooring systems
US10421523B2 (en) 2017-07-31 2019-09-24 NOV APL Limited Spread moored buoy and floating production system
RU197816U1 (ru) * 2020-02-04 2020-05-29 Общество с ограниченной ответственностью "Марлин-Юг" Устройство для автоматического развертывания автономного дрейфующего буя с протяженной вертикально-ориентированной измерительной линией

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0259072B1 (de) * 1986-08-27 1991-05-15 Taylor Woodrow Construction Limited Befestigungsanordnung und Verfahren zum Befestigen eines Schwimmkörpers
DE69222863T2 (de) * 1991-11-27 1998-05-14 Den Norske Stats Oljeselskap A/S, Stavanger Verriegelungsvorrichtung zum festmachen einer ladeboje am schiff
NO176130C (no) * 1992-05-25 1997-07-08 Norske Stats Oljeselskap System for anvendelse ved offshore petroleumsproduksjon
NO302159B1 (no) * 1994-11-04 1998-02-02 Norske Stats Oljeselskap Anordning ved laste/losseböye for anvendelse på grunt vann
NO310604B1 (no) * 1996-06-13 2001-07-30 Petroleum Geo Services As Neddykket frigjörbar böye
EP0831023A1 (de) 1996-09-20 1998-03-25 Single Buoy Moorings Inc. Unabhängig abkuppelbare Boje
EP0831022A1 (de) * 1996-09-20 1998-03-25 Single Buoy Moorings Inc. Ankerkettenstopper mit Schnellauslösung
US5816182A (en) * 1996-10-30 1998-10-06 Imodo, Inc. Tension mooring system
RU2412080C2 (ru) * 2005-10-17 2011-02-20 Сингл Бой Мурингс Инк. Улучшенная отсоединяемая плавучая швартовная система с турелью
GB2449488C (en) * 2007-05-24 2016-06-22 Bluewater Energy Services Bv Disconnectable turret mooring system for a vessel

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2011047736A1 *

Also Published As

Publication number Publication date
DK2490931T3 (en) 2016-03-14
EP2490931B1 (de) 2015-12-23
RU2508222C2 (ru) 2014-02-27
RU2012118583A (ru) 2013-11-27
CA2778285C (en) 2016-12-20
WO2011047736A1 (en) 2011-04-28
CA2778285A1 (en) 2011-04-28

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