WO2010085970A1 - Plate-forme mobile en mer - Google Patents

Plate-forme mobile en mer Download PDF

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Publication number
WO2010085970A1
WO2010085970A1 PCT/EP2009/000525 EP2009000525W WO2010085970A1 WO 2010085970 A1 WO2010085970 A1 WO 2010085970A1 EP 2009000525 W EP2009000525 W EP 2009000525W WO 2010085970 A1 WO2010085970 A1 WO 2010085970A1
Authority
WO
WIPO (PCT)
Prior art keywords
column
foot structure
cone element
offshore platform
platform
Prior art date
Application number
PCT/EP2009/000525
Other languages
English (en)
Inventor
Ola Ravndal
Ove Tobias Gudmestad
Kare Gudmund Breivik
Original Assignee
Statoil Asa
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 Statoil Asa filed Critical Statoil Asa
Priority to PCT/EP2009/000525 priority Critical patent/WO2010085970A1/fr
Publication of WO2010085970A1 publication Critical patent/WO2010085970A1/fr
Priority to DKPA201070406A priority patent/DK201070406A/da

Links

Classifications

    • 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
    • E02B17/0017—Means for protecting offshore constructions
    • E02B17/0021—Means for protecting offshore constructions against ice-loads
    • 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
    • B63B35/44—Floating buildings, stores, drilling platforms, or workshops, e.g. carrying water-oil separating devices
    • B63B35/4413—Floating drilling platforms, e.g. carrying water-oil separating devices
    • 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
    • E02B17/02—Artificial islands mounted on piles or like supports, e.g. platforms on raisable legs or offshore constructions; Construction methods therefor placed by lowering the supporting construction to the bottom, e.g. with subsequent fixing thereto
    • E02B17/021—Artificial islands mounted on piles or like supports, e.g. platforms on raisable legs or offshore constructions; Construction methods therefor placed by lowering the supporting construction to the bottom, e.g. with subsequent fixing thereto with relative movement between supporting construction and platform
    • 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
    • E02B17/04—Equipment specially adapted for raising, lowering, or immobilising the working platform relative to the supporting construction
    • E02B17/08—Equipment specially adapted for raising, lowering, or immobilising the working platform relative to the supporting construction for raising or lowering
    • E02B17/0818—Equipment specially adapted for raising, lowering, or immobilising the working platform relative to the supporting construction for raising or lowering with racks actuated by pinions
    • 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
    • E02B2017/0056—Platforms with supporting legs
    • E02B2017/0065—Monopile structures
    • 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
    • E02B2017/0056—Platforms with supporting legs
    • E02B2017/0069—Gravity structures

Definitions

  • the invention relates to a mobile offshore platform and a method of operating the platform.
  • a typical jack-up platform has a deck which rests on at least three vertically extending legs which are fixed to a gravity foot structure and/or are piled to the sea bed. The legs are positioned at the extremities of the perimeter of the deck.
  • the deck of known mobile offshores platforms is a floatable construction. When in transit, the legs are lifted above the deck. Once on location, the legs are lowered until they reach the sea bed or the previously positioned foot structure. Thereafter, the deck is jacked up along the legs up to an operational altitude above sea level.
  • Offshore platforms installed in an Arctic environment must be adapted to withstand the load of ice pushing against the platform structure.
  • the ice may develop a thickness of several meters. Even in case of land-fast ice, the ice may move laterally because of thermal expansion and contraction and of wind forces and currents at sea.
  • the platform structure must be adapted to withstand the crushing forces of drifting sea ice.
  • the platform comprises a foot structure piled to the sea bed and its single column is secured at its lower end to the foot structure.
  • the column Above the sea level, the column supports a deck with a drilling rig mounted thereon.
  • the column protects the drilling string and/or production string extending therethrough.
  • the column supports a ring which slidably encircles the column.
  • the ring has the form of a double cone and is movable along the column by hydraulic cylinders. By reciprocating upward and downward movement, the ring continuously breaks the ice adjacent to the column to protect the column from dynamic forces otherwise exerted against the column by moving ice.
  • a similar offshore platform is known from SU 1 749 375 A1.
  • a cone element On a single central column of the platform, a cone element is supported at sea level.
  • the cone element has an upper conical surface carrying a plurality of vertically pivotable arms which extend along the generatrix of the conical surface to upwardly lift and break the ice in the vicinity of the column.
  • the platform comprises a gravity-type foot structure having a plurality of watertight compartments which are controllably ballastable with sea water between an unballasted buoyant state which allows floating of the platform during transit and a ballasted state while stationary at the use site.
  • the foot structure rigidly supports a single central column extending through a central opening of a deck which is movably supported on the column.
  • the deck carries a plurality of jack-up legs to move the deck relative to the foot structure along the column.
  • the deck is lowered to a position adjacent to the foot structure with the platform floating on the foot structure alone.
  • the known platform only has limited capability of withstanding ice-induced forces. At sea level, the column is armed by an additional sleeve.
  • the mobile offshore platform comprises: a floatable foot structure adapted to be supported on a sea floor; a single vertically extending tubular column affixed at its lower end to the foot structure; and a jack-up deck unit having therethrough an opening for the passage of the column and being movable along the column by means of a jack-up mechanism.
  • the platform is characterized by a floatable annular cone element having a substantially frusto-conical upper surface, wherein the cone element encloses the column and is movable along the column relative to the deck unit between a lowermost position in which the cone element rests on the foot structure and an elevated position remote from the foot structure.
  • the cone element and the deck unit can be moved along the column independently of each other. This allows the platform to be used in relatively shallow water up to some hundred meters' water depth both under ice-free open-water conditions and during ice conditions.
  • the cone element rests, in its lowermost position, flatly on the foot structure. Due to its frusto-conical upper surface, excessive wave-induced forces which may act on the lower end of the column and/or the foot structure are avoided.
  • the foot structure has an upper surface comprising a central portion adapted to receive a geometrically mating lower surface of the cone element in the lowermost position thereof and further has a substantially frusto-conical portion enclosing the central portion so that the cone element in its lowermost position and the foot structure, in common, have a domed upper contour.
  • the domed contour lowers wave-induced forces, in particular if the surface level of the sea is below or only moderately above the upper end of the cone element.
  • the lower surface of the cone element and the central portion of the front structure geometrically mating to the lower surface can be substantially flat or inversely coned with respect to the frusto-conical upper surface of the cone element.
  • the cone element is raised to a stationary position in which the frusto-conical upper surface breaches the sea surface at approximately half the height of the cone element. Horizontal forces arising from ice drift will be reduced as the ice will break in bending and not in crushing as would be the case if the ice hits the vertical structure of the column. If the platform is operated in very shallow waters, the cone element can also rest on the foot structure during ice conditions if the water-line otherwise does not extend above the top of the cone element. Also under these conditions, an overall domed shape of the foot structure and the cone element is preferred for ice-breaking behaviour.
  • the cone element assists the mobile offshore platform during transit, i.e. movement to or from a production site.
  • the platform does not rely on the deck unit for floatation, but only on the floating properties of the foot structure and the cone element and, possibly, on the floating properties of the column.
  • the cone element is lowered to its lowermost position on the foot structure, where it increases the water plane of the floating construction and thus the floating stability.
  • the deck unit is lowered towards the foot structure, but remains above the sea level and, therefore, in a preferred embodiment, the deck unit as such is a non-floatable deck unit to lower construction costs of the platform.
  • the cone element is maintained at the surface level of the sea while lowering or raising the foot structure.
  • the cone element increases the water-plane area and thus the floating stability of the platform. Under this operation condition, the cone element may be fixed to the deck element while the column and the foot structure are jacked up relative to the deck unit.
  • the cone element preferably has a cone angle which is larger than the cone angle of the frusto-conical portion of the foot structure. In this way, not only a preferred shape of the domed structure is provided, but also a relatively flat angle is maintained to improve ice-breaking properties of the cone element.
  • the cone angle is between 110° and 140°.
  • both the cone element and the foot structure have an at least approximately circular outer circumferential contour seen in vertical direction.
  • the foot structure is a gravity-type structure and preferably has a lowermost gravity base plate, for example, made of concrete or the like. Of course, the foot structure can additionally be piled to the sea floor.
  • the column is preferably a floatable column comprising a float-chamber structure floodable with water and extending around the circumference of the column.
  • the foot structure comprises a float-chamber structure floodable with water and extending around the column.
  • the float-chamber structures allow controlling the buoyancy and the ballasting of the column and/or the foot structure during transit, installation and deinstallation.
  • the float-chamber structures comprise a plurality of individually floodable float chambers distributed in circumferential direction to allow balancing the gravity center of the platform during transit, installation and deinstallation.
  • the float-chamber structure of the column preferably extends above the sea level of the platform installed at the site, so that this chamber structure can be used for additionally ballasting the platform by ballast water above the sea level.
  • the column and/or the foot structure can contain storage tanks to buffer the production of oil or for storage of any operational fluids.
  • the jack-up mechanism comprises a plurality of vertically extending, toothed racks distributed around and mounted to the column and pinions provided on the deck unit for meshing with the racks.
  • the racks are protected against ice forces by the cone element, which, under ice-water conditions, also protects the column.
  • the racks are arranged in recessed channels of the column to improve protection.
  • the invention provides a method of operating a mobile offshore platform as described above, wherein, during transit movement of the platform and/or during stationary operation of the platform, under ice-water conditions, the cone element is positioned with its frusto- conical upper surface partially above the water level while the deck unit is positioned at a distance above the water level. At this position, the cone element not only reduces ice loads acting on the structure of the platform, but also increases the water-plane area of the platform and thus its stability, in particular during floating.
  • the cone element During stationary operation of the platform, under ice-free water conditions, the cone element is positioned at its lowermost position resting on the foot structure, thus lowering the gravity center of the platform structure and the influence of wave-forces acting on the foot structure, in particular in very shallow waters.
  • Figure 1 is a perspective view of a mobile offshore platform according to the invention
  • Figure 2 is a schematic sectional view of the platform positioned at a drilling and/or production site under ice conditions
  • Figure 3 is a sectional view of the platform during transit to or from the drilling and/or production site.
  • FIGS 1 and 2 show a mobile offshore platform 1 at a drilling and/or production site in shallow sea water.
  • the platform 1 comprises an essentially flat gravity-type foot structure 3 having a circular contour seen in vertical direction and a single tubular column 5 of approximately circular cross- section.
  • the column 5 extends vertically and is rigidly fixed to the foot structure 3 in a coaxial position thereof.
  • the column 5 extends through an opening 6 of a deck unit 7 which is of a jack-up type and is vertically movably guided on the column 5.
  • the deck unit 7 carries usual equipment for drilling and/or production of a gas and/or oil well, for example, accommodation structures 9, storage houses 11 for storage of drill pipe and casing sections, cranes 13 and a helicopter deck 15.
  • a derrick 17 is positioned on a drilling floor 19 at the top of the column 5.
  • the derrick 17 is stationary with respect to the column 5, but, of course, may be adapted to be moved to the deck unit 7.
  • a cone element 21 is provided which, independently of the deck unit 7, can be moved along the column 5 between a lowermost position in which the cone element 21 rests on the foot structure 3, as shown in Figure 1 or in dashed lines at 21' in Figure 2, and an elevated position remote from the foot structure 3, as shown in Figure 2 in full lines.
  • the cone element 21 serves a plurality of purposes depending on the operation conditions of the platform 1 , as explained below in more detail.
  • the foot structure 3 and the column 5 may be exposed to wave-induced forces.
  • the cone element 21 is positioned in its lowermost position, as indicated in Figure 1 or at 21' in Figure 2.
  • the foot structure 3 and the cone element 21 in common, have a domed upper contour.
  • the cone element 21 has a substantially frusto-conical upper surface 23 ( Figure 2) and a substantially flat lower surface 25.
  • the foot structure 3 has an upper surface comprising a substantially flat central portion 27 adapted to receive the lower surface 25 of the cone element 21 in the lowermost position thereof and a substantially frusto-conical portion 29 enclosing the central portion 27.
  • the generatrix of the frusto-conical upper surface 23 and the lower surface 25 of the cone element 21 enclose an angle 31 which is less than a corresponding angle 33 between the frusto-conical portion 29 and a lower base surface 35 of the foot structure 3. Based on the angle 31 , the cone angle of the cone element 21 is between 110° and 140°, preferably about 126°.
  • the lower surface 25 and the central portion 27 can have non- flat but mating shapes.
  • the lower surface can have a frusto-conical shape inversely to frusto-conical upper surface 23.
  • the central portion of the foot structure 3 has a geometrically mating frusto-conical surface shape as indicated at 27'.
  • the cone element 21 Under ice conditions, for example, in an operation at Arctic sea, the cone element 21 is raised along the column 5 up to the sea level indicated at 37, as shown in Figure 2.
  • the frusto-conical upper surface 23 of the cone element 21 breaks through the surface level 37 with about half the axial height of the cone element 21. Ice drifting on the sea will be bent and broken, as indicated at 39, before it is crushed against the vertical structure of the column 5. Thus, the cone element 21 reduces ice loads on the structure of the platform 1.
  • the deck unit 7 is movable along the column 5 by means of a jack-up mechanism 41 comprising a plurality of toothed racks 43 which extend vertically along the total length of the column 5.
  • the racks 43 are distributed in circumferential direction of the column 5 and are arranged in recessed channels 47 ( Figure 1) to protect the racks against ice damage.
  • the cone element 21 is fixed to the deck unit 7 by a plurality of hangers 49 (Figure 2) the length of which is adjustable relative to the deck unit 7.
  • the hangers 49 are steel cables adjustable by winches.
  • the cone element 21 in particular under ice conditions, is adapted to be rigidly connected to the column 5, for example, by wedges or any other suitable means.
  • the flexible hangers 49 may be replaced by hangers rigidly connecting the cone element 21 to the deck unit 7 such that the cone element 21 follows a movement of the deck unit 7 relative to the column 5. Rigid connection of the cone element 21 to the deck unit 7 is advisable during transit operation of the platform 1 to and from the operational site.
  • the platform 1 is a gravity-type platform wherein the foot structure 3 has a base plate 51 made of ballast material, for example, concrete. Of course, the foot structure 3 may alternatively or additionally be piled to the sea floor shown at 53 ( Figure 2).
  • the base plate 51 has a central opening 55 to receive usual well head components 57, for example, a blow-out preventer or the like.
  • the foot structure 3, the column 5 and the cone element 21, but not the deck unit 7 are floatable components to allow movement of the platform 1 in a transit operation to and from the drilling and/or production site.
  • the outer hull of the foot structure 3 forms a float-chamber structure 59 to provide buoyancy to the platform 1.
  • Another float-chamber structure 61 is provided within the column 5 to increase the buoyancy of the platform 1.
  • the float-chamber structures 59, 61 extend around the foot structure 3 and the column 5, respectively.
  • At least one of the float-chamber structures 59, 61 is divided into a plurality of individual floodable float chambers by partition walls 65 as indicated in Figure 1.
  • a third float- chamber structure 67 is enclosed by the cone element 21.
  • the float-chamber structures provide for buoyancy of the platform 1 if they are drained from water. Flooding the float-chamber structures 59, 61, 67 with water ballasts the platform 1. To increase the ballast, the float-chamber structure 61 of the column 5 extends above the sea level 37.
  • the space within the column 5 and the foot structure 3 is used for buffer- storing produced oil and contains storage tanks 69 and 71 , respectively.
  • Figure 3 shows the floating platform 1 during transit.
  • the float chamber structures 59, 61 and 67 are depleted of water to provide buoyancy to the platform 1.
  • the cone element 21 rests, in its lowermost position, adjacent to the foot structure 3 and is fixed to the deck unit 7 by rigid hangers 49.
  • the deck unit 7 is positioned on the column 5 near the foot structure 3, but above the surface level 37 of the sea, so that the major part of the column 5 extends above the deck unit 7 including the derrick 17, which remains stationary on top of the column 5 even during transit. Since the cone element 21 at least partially extends above the surface level 37, the cone element 21 increases the water-plane area of the floating platform 1 and thus improves the floating stability of the platform 1.
  • the float-chamber structures 59 and 61 of the foot structure and the column 5, respectively are flooded with water to ballast the structures while the jack-up mechanism 41 lowers the foot structure 3 and the column 5 towards the sea floor 53.
  • the cone element 21 increases the water-plane area and provides for better floating stability.
  • Deinstalling the platform 1 is performed vice versa.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Architecture (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Ocean & Marine Engineering (AREA)
  • Earth Drilling (AREA)

Abstract

L'invention porte sur une plate-forme mobile en mer (1), laquelle plate-forme comprend une structure de pied flottante (3) apte à être supportée sur le sol marin, une unique colonne tubulaire s'étendant verticalement (5) fixée à son extrémité inférieure à la structure de pied (3) et une unité de pont auto-élévatrice (7) présentant à travers celle-ci une ouverture pour le passage de la colonne, et étant mobile le long de la colonne (5) au moyen d'un mécanisme d'auto-élévation (41). Un élément conique annulaire flottant (21) présentant une surface supérieure sensiblement tronconique (23) et une surface inférieure sensiblement plate ou en cône inversé renferme la colonne (5), et est mobile le long de la colonne (5) par rapport à l'unité de pont (7) entre une position la plus inférieure dans laquelle l'élément conique (21) repose sur la structure de pied (5) et une position élevée éloignée de la structure de pied (3). Dans des conditions environnementales hors-gel, l'élément conique est positionné dans sa position la plus inférieure de façon à diminuer les forces induites par les vagues. Si la mer est recouverte de glace, l'élément conique (21) est élevé dans une position au niveau de la surface (37) de la mer de façon à soulever et à briser les glaces à la dérive. Lors du transit de la plateforme (1), l'élément conique (21) est abaissé sur la structure de pied (3) afin d'augmenter la surface plane à l'eau, et, par conséquent, la stabilité de flottaison de la plate-forme (1). La plate-forme (1) flotte du fait de la flottabilité de la structure de pied (3), de la colonne (5) et de l'élément conique (21) seul sans assistance de flottaison de l'unité de pont (7).
PCT/EP2009/000525 2009-01-27 2009-01-27 Plate-forme mobile en mer WO2010085970A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PCT/EP2009/000525 WO2010085970A1 (fr) 2009-01-27 2009-01-27 Plate-forme mobile en mer
DKPA201070406A DK201070406A (da) 2009-01-27 2010-09-24 Mobil offshore-platform

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2009/000525 WO2010085970A1 (fr) 2009-01-27 2009-01-27 Plate-forme mobile en mer

Publications (1)

Publication Number Publication Date
WO2010085970A1 true WO2010085970A1 (fr) 2010-08-05

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ID=41119906

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2009/000525 WO2010085970A1 (fr) 2009-01-27 2009-01-27 Plate-forme mobile en mer

Country Status (2)

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DK (1) DK201070406A (fr)
WO (1) WO2010085970A1 (fr)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL2005755C2 (en) * 2010-11-25 2012-05-29 Cobus Beheer B V Floating marine structure.
EP2573273A1 (fr) * 2011-09-23 2013-03-27 Sinovel Wind Group Co., Ltd Dispositif de protection, plate-forme de support en mer et système d'aérogénérateur en mer
RU2603421C1 (ru) * 2015-10-13 2016-11-27 Акционерное общество "Центральное конструкторское бюро "Коралл" Морская самоподъемная платформа
CN107150770A (zh) * 2017-05-26 2017-09-12 大连理工大学 一种适用于壳体桩腿自升式海洋平台的抗冰装置
WO2018148144A1 (fr) * 2017-02-13 2018-08-16 Saudi Arabian Oil Company Plate-forme en mer à auto-installation
CN110040223A (zh) * 2018-01-15 2019-07-23 中集海洋工程研究院有限公司 抗冰型半潜式平台
CN110055960A (zh) * 2019-05-24 2019-07-26 上海勘测设计研究院有限公司 用于海上风电桩式基础的破冰消浪组合装置
WO2019177010A1 (fr) * 2018-03-14 2019-09-19 株式会社 吉田組 Installation de travail en mer et son procédé de construction
US11685486B2 (en) 2021-01-14 2023-06-27 Saudi Arabian Oil Company Resilient bumper and bumper system
WO2023170224A1 (fr) 2022-03-09 2023-09-14 Monobase Wind B.V. Structure marine et procédé

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US4451174A (en) * 1983-02-07 1984-05-29 Global Marine Inc. Monopod jackup drilling system
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UA13074U (en) * 2005-09-15 2006-03-15 Nat Academy Of Environmental A Appliance for protection of hydro-technical structure against ice effect

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DE2457536A1 (de) * 1974-12-03 1976-06-10 Holzmann Philipp Ag Offshore-plattform
US4451174A (en) * 1983-02-07 1984-05-29 Global Marine Inc. Monopod jackup drilling system
US4627767A (en) * 1983-07-22 1986-12-09 Santa Fe International Corporation Mobile sea barge and platform
FR2645827A1 (fr) * 1989-04-18 1990-10-19 Snam Progetti Plate-forme marine formee d'une pluralite d'elements modulaires pour le stockage de produits et pour l'amarrage et le chargement directs des navires, et procede d'installation, de demontage et de reinstallation en un autre endroit de cette plate-forme
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Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL2005755C2 (en) * 2010-11-25 2012-05-29 Cobus Beheer B V Floating marine structure.
WO2012070941A2 (fr) 2010-11-25 2012-05-31 Cobus Beheer B.V. Structure marine flottante
WO2012070941A3 (fr) * 2010-11-25 2012-07-19 Cobus Beheer B.V. Structure marine flottante
US9499240B2 (en) 2010-11-25 2016-11-22 Cobus Beheer B.V. Floating marine structure
EP2573273A1 (fr) * 2011-09-23 2013-03-27 Sinovel Wind Group Co., Ltd Dispositif de protection, plate-forme de support en mer et système d'aérogénérateur en mer
RU2603421C1 (ru) * 2015-10-13 2016-11-27 Акционерное общество "Центральное конструкторское бюро "Коралл" Морская самоподъемная платформа
US10352010B2 (en) 2017-02-13 2019-07-16 Saudi Arabian Oil Company Self-installing offshore platform
WO2018148144A1 (fr) * 2017-02-13 2018-08-16 Saudi Arabian Oil Company Plate-forme en mer à auto-installation
CN107150770A (zh) * 2017-05-26 2017-09-12 大连理工大学 一种适用于壳体桩腿自升式海洋平台的抗冰装置
CN110040223A (zh) * 2018-01-15 2019-07-23 中集海洋工程研究院有限公司 抗冰型半潜式平台
WO2019177010A1 (fr) * 2018-03-14 2019-09-19 株式会社 吉田組 Installation de travail en mer et son procédé de construction
JPWO2019177010A1 (ja) * 2018-03-14 2021-03-11 株式会社 吉田組 洋上作業設備およびその製造方法
JP7126111B2 (ja) 2018-03-14 2022-08-26 株式会社 吉田組 洋上作業設備およびその製造方法
JP7464658B2 (ja) 2018-03-14 2024-04-09 株式会社 吉田組 洋上作業設備およびその製造方法
CN110055960A (zh) * 2019-05-24 2019-07-26 上海勘测设计研究院有限公司 用于海上风电桩式基础的破冰消浪组合装置
US11685486B2 (en) 2021-01-14 2023-06-27 Saudi Arabian Oil Company Resilient bumper and bumper system
WO2023170224A1 (fr) 2022-03-09 2023-09-14 Monobase Wind B.V. Structure marine et procédé
NL2031193B1 (en) 2022-03-09 2023-09-18 Deawoo Eng & Construction Co Ltd Marine structure and method

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