EP2789552A1 - Dispositif offshore doté d'un système de support à deux étages - Google Patents

Dispositif offshore doté d'un système de support à deux étages Download PDF

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Publication number
EP2789552A1
EP2789552A1 EP13163605.2A EP13163605A EP2789552A1 EP 2789552 A1 EP2789552 A1 EP 2789552A1 EP 13163605 A EP13163605 A EP 13163605A EP 2789552 A1 EP2789552 A1 EP 2789552A1
Authority
EP
European Patent Office
Prior art keywords
offshore
foundation
seabed
anchor system
anchor
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
EP13163605.2A
Other languages
German (de)
English (en)
Other versions
EP2789552B1 (fr
Inventor
Hans Jacob Hvide
Andrea Rosponi
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.)
Tractebel Overdick GmbH
Original Assignee
Overdick GmbH and Co KG
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 Overdick GmbH and Co KG filed Critical Overdick GmbH and Co KG
Priority to EP13163605.2A priority Critical patent/EP2789552B1/fr
Priority to MYPI2015002524A priority patent/MY175646A/en
Priority to PCT/EP2014/057388 priority patent/WO2014167101A1/fr
Publication of EP2789552A1 publication Critical patent/EP2789552A1/fr
Application granted granted Critical
Publication of EP2789552B1 publication Critical patent/EP2789552B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D88/00—Large containers
    • B65D88/78—Large containers for use in or under water

Definitions

  • the invention relates to an offshore facility and a method for offshore foundation of the offshore facility.
  • Offshore facilities such as oil rigs, tidal power plants, wind turbines, etc. can be established for permanent offshore whereabouts on the seabed.
  • the foundations required for this purpose, such as piles, foundations, etc., are technically complex and cost-intensive.
  • offshore facilities such as offshore tanks, which float on the surface of the sea and are kept at a location by means of an anchor system.
  • offshore facilities such as offshore tanks, which float on the surface of the sea and are kept at a location by means of an anchor system.
  • the issue of intermediate crude storage is important if there are no pipeline direct pipeline connections, since the platform usually can not provide intermediate storage for capacity reasons.
  • a common system for the intermediate storage of extracted crude oil may be a Floating Storage Unit (FSU) or FSO (Floating Storage and Off-loading) or Floating Production Storage and Off-loading (FPSO), ie one for temporary storage converted tanker.
  • FSU Floating Storage Unit
  • FPSO Floating Production Storage and Off-loading
  • Another common precaution for intermediate storage of the extracted crude oil may be a tank system at the bottom of the sea, a so-called Mat tank, integrated directly below the platform into the foundation structure.
  • the crude oil accumulated in the FSU, FSO, FPSO or Mat-Tank is then released from time to time to a shuttle tanker, which brings the crude oil to the coast.
  • FSUs, FSOs and FPSOs A disadvantage of the FSUs, FSOs and FPSOs is that the costs and the availability depend heavily on the market situation and they are manned, which generates high running costs due to the required high security level.
  • FSUs, FSOs and FPSOs are exposed to severe environmental burdens, as wind, currents and waves strike directly at the FSUs, FSOs and FPSOs.
  • the anchor system must therefore be designed for high loads and redundant. Mat tanks in turn have the disadvantage that they are firmly integrated into the foundation structures and are therefore difficult to access for maintenance.
  • the offshore device according to the invention has a two-stage offshore holding system with which the offshore device is kept at the seabed.
  • the two-stage offshore holding system includes a gravity foundation and an anchor system.
  • offshore facility In addition to drilling rigs, it also includes, in particular, offshore installations, which are arranged completely below a sea surface after the foundation of gravity, particularly preferably, the offshore installation can be designed as an offshore tank.
  • a gravity foundation device is here to understand a device that allows by the action of gravity on the offshore facility lowering the device to the seabed and the offshore facility founded by the gravitational effect on the seabed.
  • the gravity foundation device secures the offshore facility in a first stage against slippage on the seabed by operating loads acting on the offshore facility to a limit state of operating loads.
  • the gravity foundation device is designed for the expected operating loads.
  • the anchor system secures the offshore installation in a second stage against slippage on the seabed by extreme loads acting on the offshore installation, beyond the limit of operating loads.
  • the anchor system is designed for the higher extreme loads compared to the operating loads.
  • the two-stage offshore holding system according to the invention from a combined gravity-establishing device for the operating load case and additional armature system for the extreme load case solves the problems mentioned.
  • the offshore device Although acting on the established offshore facility extreme loads, the offshore device from a predetermined foundation area slip, but according to the invention, the offshore tank can not slip arbitrarily far.
  • An outer limits of slippage determining slipping range is given by the anchor system.
  • the anchor system secures the offshore tank within the slip range even in extreme load situations.
  • the gravity-establishing device comprises at least one protrusion protruding from the sea-side of the offshore device, which burrows into the foundation region during the foundation of gravity.
  • the at least one projection can be designed differently. In a loose seabed, it is preferably designed as an apron. However, it can also have thorns, especially when the seabed is firmer.
  • the anchor system conveniently has a plurality of anchors arranged in the seabed and in each case an outgoing from each of the anchors anchor chain to a fastening device on the offshore device.
  • the offshore device is aufschwimmbar and formed lowerable again.
  • the offshore facility is preferably mobile.
  • the anchor chains are favorably dimensioned so that they allow floating of the slipped offshore facility and the floated offshore facility is pulled back to Lokation by self-weights of the anchor chains, so the anchor system relocalises the offshore facility.
  • the resuspendable offshore facility significantly facilitates maintenance and inspections against offshore facilities permanently and permanently established on the seabed.
  • the offshore facility can also be easily towed to another location after floating.
  • the offshore facility is designed as an offshore tank.
  • the offshore tank is provided for the storage, in particular temporary storage of at least one liquid medium in a plurality of storage chambers.
  • the at least one liquid medium may in particular be a crude oil-containing medium or crude oil.
  • the offshore tank preferably comprises at least one ballast chamber and at least one air chamber.
  • the air chambers and storage chambers can be controlled filled with the at least one liquid medium, so that the offshore tank is founded by the action of gravity and dig the aprons in the seabed.
  • the gravity-activated offshore tank is secured against slipping up to the limit of operating loads.
  • the offshore tank can slip within the slip area.
  • the anchor system secures the established offshore tank in the slip area even at extreme loads.
  • the established offshore tank remains usable even after slipping within the slip area. It can therefore continue to be filled with the at least one liquid medium.
  • the anchor system allows in a preferred embodiment of the invention, the automatic relocation of the offshore tank.
  • the anchor chains exert directed tensile forces on the floating offshore tank at location, ie the area of the sea level that is vertically above the predetermined foundation area.
  • the anchoring chains arranged on the floating offshore tank are preferably designed such that the anchors are positioned far enough from one another that the offshore tank is automatically pulled to location in calm seas by the tensile forces of the anchor chains.
  • a filling and removal device for the at least one storage chamber and / or air chamber with the at least one liquid medium is provided.
  • the device is designed as at least one flexible supply hose for the at least one liquid medium and the air.
  • the supply hose may also include cables for powering and controlling systems integrated into the offshore tank.
  • an anchor system is designed at a predetermined foundation area, the offshore facility is moved to location above the predetermined foundation area, the anchor system is connected to the offshore facility, and the offshore facility is established by gravity at the predetermined foundation area.
  • the anchor system may be designed simultaneously prior to or after the offshore installation has been moved.
  • Gravity foundation keeps the offshore facility under the operating loads in the predetermined foundation area. In extreme load cases, the offshore installation can slip within the slip area.
  • the offshore facility moved from the foundation area to the seabed is floated, the anchor system exerts tensile forces on the floating offshore facility, and the floated offshore facility relocates automatically.
  • the relocalized offshore facility is re-established on the predetermined foundation area.
  • the method is particularly suitable for implementation with one of the abovementioned offshore tanks.
  • Fig. 4 an offshore tank lowered to the seabed according to Fig. 3 ,
  • the in FIG. 1 shown offshore tank 1 has a hull 6 and arranged along an underwater side of the hull 6 ballast chamber 3 and a plurality in the interior of the hull 6 meeresgroundabseitg the ballast chambers 3 arranged storage chambers 4. At the sea bottom side area air chambers 9 are arranged.
  • the ballast chambers 3 are arranged along the entire underwater side of the hull 6.
  • the ballast chambers 3 are filled with ballast.
  • ballast for example, barite having a density of about 4.0 g / cm 3 or concrete having a density of about 2.3 g / cm 3 is used. Gravel or gravel can also be used.
  • the ballast chambers 3 are so far filled with ballast that the offshore tank 1 at completely emptied, ie completely filled with air, air chambers 9 floats on a sea surface 7.
  • the offshore tank 1 can be towed from a port offshore to location in the 'wet tow' method.
  • the storage chambers 4 would also be emptied and completely filled with air.
  • the floating offshore tank 1 is in Fig. 1 shown.
  • the hull 6 tapers away from a seabed 31 in order to provide an oblique attack surface to the horizontal forces on the seabed 31 after a gravity foundation.
  • the storage chambers 4 are separated by bulkheads 8.
  • the storage chambers 4 are used to receive crude oil, which is conveyed via a (not shown) oil platform from a deposit and stored in the offshore tank 1.
  • the storage chambers 4 extend over the entire horizontal extent of the offshore tank 1.
  • the storage chambers 4 a plurality of air chambers 9 is provided.
  • the air clamps 9 are used to hold air or in the gravitational foundation also for receiving seawater to at least temporarily generate additional ballast.
  • apron 44 is arranged at the underwater side of the hull 6 a projecting in the direction of the seabed 31 .
  • the skirt 44 completely surrounds the underwater side of the offshore tank 1.
  • Fig. 2 shows a section at the level of the storage chambers 4 in Fig. 1
  • Fig. 3 shows the drawn on location offshore tank 1 with ballasted ballast chambers 3 and air-filled storage chambers 4 and air chambers 9.
  • the weight of the ballast and the size of the storage chambers 4 are dimensioned so that the offshore tank 1, if at least the air chambers 9 completely filled with air, floating.
  • the pulled on location offshore tank 1 is anchored by means of a previously designed, automatically relocalizing anchor system 30 in the seabed 31.
  • the anchor system 30 comprises a plurality of anchors 32 inserted in the seabed 31, of which in each case an anchor chain 33 leads to an eyelet 34 arranged on an outer shell 2 of the offshore tank 1.
  • the length of the anchor chains 33 and the arrangement of the eyelets 34 on the outer shell 2 of the offshore tank 1 are dimensioned so that the anchor chains 33 sag somewhat and thereby independently pull the offshore tank 1 to location over a predetermined foundation area 31a.
  • the predetermined foundation area 31a may be prepared by removing stones, rocks thereon and compensating for severe unevenness.
  • the offshore tank 1 is anchored in the vicinity of an oil platform, not shown.
  • Fig. 4 shows the lowered to the seabed 31 offshore tank 1.
  • seawater is first admitted into the storage chambers 4.
  • the storage chambers 4 are filled so far that the offshore tank 1 still floats.
  • the offshore tank 1 drops due to the effect of gravity on the predetermined foundation area 31 a.
  • An underwater side of the fuselage 6 of the offshore tank 1 has the skirt 44, which buries itself by the gravitational force when lowering the offshore tank 1 in the foundation area 31 a and anchored the offshore tank 1 in the predetermined foundation area 31 a and holds.
  • the skirt 44 keeps the offshore tank 1 in the foundation area 31a at operating loads up to the limit state of the operating loads.
  • the founded offshore tank 1 can slip on the seabed 31 within a slipping area 31 b.
  • the size of the slipping region 31 b is determined by the length of the anchor chains 33 and the distance of the Anchor 32 from the offshore tank 1 and the associated eyelet 34 determined.
  • the slipping is in Fig. 4 characterized by two double arrows.
  • the offshore tank 1 and the ballast are dimensioned so that the offshore tank 1 in completely filled with crude oil storage chambers 4 and seawater filled air chambers 9, solely by gravity to the limit state of serviceability slips on the foundation area 31 a.
  • the anchor system 30 is greatly relieved compared to the anchorage of ever-floating offshore tanks 1.
  • the environmental impact of waves, wind and current on the offshore tank 1 are greatly reduced at the seabed 31 with respect to the sea surface 7.
  • the environmental impact is very low, so that the extreme load case does not occur. What is meant by greater depths depends on the location of the foundation area 31 a.
  • the environmental impact can be very low in some locations at 20-30m or in other locations only from depths of 50 m.
  • the anchor chains 33 and armature 32 engage only when in an extreme load case the off-hop tank 1 despite apron 44 from the foundation area 31 a slips, so the operating loads exceed the limit state of the operating loads. Even the extreme loads arising in extreme load cases are significantly lower than those caused by waves, wind, etc. a floating offshore tank 1 attacking environmental pollution.
  • the anchor system 30 only needs to be designed for the greatly reduced extreme loads on the seabed.
  • the offshore tank 1 After an extreme load case on the seabed 31, the offshore tank 1 is controlled to float by 9 air is pumped into the air chambers.
  • the floated offshore tank 1 relocated by the tensile force of the anchor chains 33 automatically to location directly above the foundation area 31 a. He is, after being relocalized, founded again by flooding the air chambers 9 with seawater.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Foundations (AREA)
  • Revetment (AREA)
EP13163605.2A 2013-04-12 2013-04-12 Dispositif offshore doté d'un système de support à deux étages Not-in-force EP2789552B1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP13163605.2A EP2789552B1 (fr) 2013-04-12 2013-04-12 Dispositif offshore doté d'un système de support à deux étages
MYPI2015002524A MY175646A (en) 2013-04-12 2014-04-11 Offshore installation with two-stage retention system
PCT/EP2014/057388 WO2014167101A1 (fr) 2013-04-12 2014-04-11 Installation en mer, comportant un système de retenue à deux étages

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP13163605.2A EP2789552B1 (fr) 2013-04-12 2013-04-12 Dispositif offshore doté d'un système de support à deux étages

Publications (2)

Publication Number Publication Date
EP2789552A1 true EP2789552A1 (fr) 2014-10-15
EP2789552B1 EP2789552B1 (fr) 2017-09-27

Family

ID=48095694

Family Applications (1)

Application Number Title Priority Date Filing Date
EP13163605.2A Not-in-force EP2789552B1 (fr) 2013-04-12 2013-04-12 Dispositif offshore doté d'un système de support à deux étages

Country Status (3)

Country Link
EP (1) EP2789552B1 (fr)
MY (1) MY175646A (fr)
WO (1) WO2014167101A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017168144A1 (fr) * 2016-03-29 2017-10-05 Sllp 134 Limited Procédé d'installation d'une structure sous-marine

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3568737A (en) * 1968-10-23 1971-03-09 Texaco Development Corp Offshore liquid storage facility
US20060225810A1 (en) * 2003-03-26 2006-10-12 Michel Baylot Buoyancy device and method for stabilizing and controlling lowering or raising of a structure between the surface and the sea floor
US20120045285A1 (en) * 2010-08-23 2012-02-23 Oil Well Closure And Protection As Offshore structure

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3568737A (en) * 1968-10-23 1971-03-09 Texaco Development Corp Offshore liquid storage facility
US20060225810A1 (en) * 2003-03-26 2006-10-12 Michel Baylot Buoyancy device and method for stabilizing and controlling lowering or raising of a structure between the surface and the sea floor
US20120045285A1 (en) * 2010-08-23 2012-02-23 Oil Well Closure And Protection As Offshore structure

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017168144A1 (fr) * 2016-03-29 2017-10-05 Sllp 134 Limited Procédé d'installation d'une structure sous-marine

Also Published As

Publication number Publication date
EP2789552B1 (fr) 2017-09-27
WO2014167101A1 (fr) 2014-10-16
MY175646A (en) 2020-07-03

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