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WO2015038003A1 - Coque flottante comprenant une partie de stabilisation - Google Patents

Coque flottante comprenant une partie de stabilisation Download PDF

Info

Publication number
WO2015038003A1
WO2015038003A1 PCT/NO2014/050162 NO2014050162W WO2015038003A1 WO 2015038003 A1 WO2015038003 A1 WO 2015038003A1 NO 2014050162 W NO2014050162 W NO 2014050162W WO 2015038003 A1 WO2015038003 A1 WO 2015038003A1
Authority
WO
WIPO (PCT)
Prior art keywords
platform
stabilizing element
indicated
hull
main portion
Prior art date
Application number
PCT/NO2014/050162
Other languages
English (en)
Inventor
Jan Aarsnes
Einar Bernt GLOMNES
Ragnar THUNES
Original Assignee
Sevan Marine 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 Sevan Marine Asa filed Critical Sevan Marine Asa
Publication of WO2015038003A1 publication Critical patent/WO2015038003A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B1/00—Hydrodynamic or hydrostatic features of hulls or of hydrofoils
    • B63B1/02—Hydrodynamic or hydrostatic features of hulls or of hydrofoils deriving lift mainly from water displacement
    • B63B1/04—Hydrodynamic or hydrostatic features of hulls or of hydrofoils deriving lift mainly from water displacement with single hull
    • B63B1/041—Hydrodynamic or hydrostatic features of hulls or of hydrofoils deriving lift mainly from water displacement with single hull with disk-shaped hull
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B39/00—Equipment to decrease pitch, roll, or like unwanted vessel movements; Apparatus for indicating vessel attitude
    • B63B39/06—Equipment to decrease pitch, roll, or like unwanted vessel movements; Apparatus for indicating vessel attitude to decrease vessel movements by using foils acting on ambient water
    • B63B2039/067—Equipment to decrease pitch, roll, or like unwanted vessel movements; Apparatus for indicating vessel attitude to decrease vessel movements by using foils acting on ambient water effecting motion dampening by means of fixed or movable resistance bodies, e.g. by bilge keels
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/70—Wind energy
    • Y02E10/727—Offshore wind turbines

Definitions

  • This invention relates to a floating vessel with a hull which is essentially symmetrical about a center axis and with a stabilizing portion as indicated in the preamble of claim 1.
  • Such operations can be production and storage (including unloading) of hydro carbons, well intervention, drilling, maintenance of well and well installations, and installation of wind mills.
  • a floating platform type which has proven especially suitable has a cylindrical shaped hull with a basically flat base, and where the diameter of the hull is substantially greater than its depth.
  • the center of buoyancy for the submerged part of the hull is below the center of gravity of the platform, and such a construction has proven advantageous in several ways, f. ex. with respect to large capacity for both loading on deck and storing of oil.
  • the circular shape (or approximately this) of the hull makes it unnecessary to turn the platform according to weather and wind, and its motions and strains are small compared to other types of floating facilities.
  • a platform of this type is described in WO 02/090177 Al .
  • the stabilizing effect is essentially achieved by the flow inertia of the body of water providing the volume of water below the hull and stabilizing portion (known as "added mass") to follow the vertical motions of the hull and providing that the mass to be moved is increased significantly when the diameter of the lower part of the hull is extended in this way.
  • the area of the stabilizing portion will be adapted to the size of the hull and the actual environmental loads in order to achieve the intended effect.
  • the space needed in a building or service dock is substantially greater than the main hull itself (in other words without stabilizing portion) requires.
  • the limiting factor is often the dock gate.
  • the available building docks have usually not wide enough dock gates to allow for example a stabilizing portion with annular width more than 10 meters when the diameter of the hull already is 90 meters.
  • stabilizing portion • It is complicated to adapt the stabilizing portion to altered operating conditions.
  • Known stabilizing portions are integrated in the main hull, and the available internal volume is often utilized for storing, for example as ballast tanks.
  • a platform arranged to float in a body of water comprising a hull with a main portion which is substantially symmetrical about a center axis and which at an upper end is supporting a deck and at its lower end, below a nominal water line, is provided with a stabilizing element which protrudes from the main portion.
  • the platform according to the invention is characterized by the base of the stabilizing element being non-circular and has opposite first and second side portions and opposite first and second end portions, and where a first distance between the two end portions is less than a second distance between the two end portions.
  • the main portion is circle symmetrical about the center axis and the first distance is greater or equal to the diameter of the main portion.
  • the lower surface of the stabilizing element and the lower surface of the main portion are level and together forming a lower bottom surface for the platform.
  • the stabilizing element comprises in one embodiment an extended portion with a plate element.
  • the base of the stabilizing element has an oblong shape.
  • the base of the stabilizing element has a shape of a cut circle.
  • the base of the stabilizing element is oval, elliptic, super elliptic, or rectangular.
  • the deck is supported above the water line, and solely by the hull, including the main portion and the stabilizing element.
  • the platform comprises means for retaining the platform in a position in the body of water.
  • These means could be anchoring lines which are anchored to a sea bed, or a system for dynamic positioning.
  • Figure 1 is a perspective view of an embodiment of the invention, seen from above at an angle;
  • Figure 2 is a view of the embodiment shown in figure 1, seen straight from above;
  • Figure 3 is a view of the embodiment shown in figure 1, seen from below at an angle;
  • Figure 4 is a principal sketch of an embodiment of the device according to the invention, seen from below and in a cross section through the nominal water line of the hull;
  • Figure 5a is a principal sketch showing a circle shaped hull portion with a stabilizing element of a known type, while figure 5b shows a circle shaped hull portion with a variant a of stabilizing element according to the invention; and Figures 6a-d are principal sketches illustrating different base shapes for the stabilizing element according to the invention.
  • FIG. 1 shows a platform 2 floating in a body of water W.
  • the platform comprises a hull 1 having a circular (or approximately circular) portion la, symmetrical about its center axis (vertical axis) S.
  • This circular hull portion la has in its upper area an extended portion lb, (i.e. with a greater diameter than the portion below) which supports a deck 5.
  • the deck accommodates per se known installations and equipment, such as processing modules 6, connection equipment 13 for loading and unloading of hydro carbons, living quarters 7 and helipad 8.
  • a deck opening 9 allows access between the deck and installations on the sea bed (not shown).
  • Such deck openings are well known, and can be used among other things for drill strings or wellbore intervention equipment (not shown) or - as in the shown embodiment - for suspending and connecting risers 10 (f. ex. SCR as mentioned above) and control and power lines 11.
  • Figure 3 shows that the outer base 12 of the hull in this embodiment is flat.
  • Anchoring lines 4 anchors the platform to the sea bed in a per se known way. It should also be understood that the platform may be equipped with thrusters (not shown) and is held in position by means of these, controlled by systems for dynamic positioning (DP).
  • DP dynamic positioning
  • the nominal water line WL of the platform is shown in figures 1 and 3 as the transition between the light and dark portions on the circular hull portion la .
  • the stabilizing element protrudes from the circular hull portion la and comprises in the illustrated embodiment an extended portion 3a with a plate element 3b.
  • the extended portion 3a can accommodate internal ballast chambers (not shown) which are in connection with the upper ballast chambers of the platform.
  • the stabilizing element has in the shown embodiment openings 16 for the anchoring lines 4.
  • the stabilizing element 3 comprises in the shown embodiment two defined side edges 14a, b on opposite sides of the stabilizing element, in the illustrated embodiment two parallel long sides.
  • the stabilizing element 3 is consequently not circular as the circular hull portion la, but has a defined length and width, with opposing end portions 15a, b.
  • Figure 4 illustrates the fundamental shape of the stabilizing elements 3, and shows among other things that a first dimension c (here the width, defined by the side edges 14a, b) is smaller than a second dimension d (here the length, defined by the end portions 15a, b).
  • the width c is also greater than the diameter a of the circular hull portion la, but in principle, c can be approximately equal to a.
  • Figure 5b is a principle sketch of a variant where the length d is substantially greater than the width c, such that the base of the stabilizing element 3 is more oblong than the variant illustrated in figure 4.
  • the base of the stabilizing element 3 can consequently be in the shape of f. ex. a cut circle, an oval, an ellipsis, a super ellipsis, or a rectangle. Examples of such stabilizing element shapes are shown in figures 6a-d.
  • FIG. 5a shows a stabilizing element as known in the art with a circular base area A
  • figure 5b shows an embodiment of the stabilizing element according to the invention with a non-circular base area B
  • Figure 5b suggests how area B can be made equally large to area A (figure 5a), thereby maintaining the heave properties, f. ex. by area Ai equaling area Bi and area A 2 equaling B 2 .
  • the areas in figure 5b are not exactly calculated, as the purpose with the figures 5a, b is meant to only illustrate a principle which can be used. Such a design principle could be used if it is desired to maintain the favorable heave properties of the platform even though the shape of the stabilizing element is altered as described above, as "added mass" is the same as with the known stabilizing elements.
  • the roll and pitch motions of the platform can be regulated individually and in a better way than what is the case with the known platforms.
  • a roll axis (x) and a pitch axis (y) is drawn, it is understood that if the waves hit the platform from a direction marked with the arrow L, the roll motion of the platform (about the x-axis) will be smaller than if the waves had hit the platform f. ex. along the x-axis.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Ocean & Marine Engineering (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
  • Earth Drilling (AREA)

Abstract

L'invention concerne une plateforme (2) conçue pour flotter dans un plan d'eau (W) comprenant une coque (1) dotée d'une partie principale (1a) qui est sensiblement symétrique autour d'un axe central (S) et qui supporte au niveau d'une extrémité supérieure un pont (5) et au niveau de son extrémité inférieure, sous une ligne d'eau nominale (WL), est dotée d'un élément de stabilisation (3) qui fait saillie depuis la partie principale (1a). La base (B) de l'élément de stabilisation (3) est non circulaire et comprend des première et seconde parties latérales se faisant face (14a, b) et des première et seconde parties d'extrémité se faisant face (15a, b), une première distance (c) entre les deux parties latérales (14a, b) étant inférieure à une seconde distance (d) entre les deux parties d'extrémité (15a, b).
PCT/NO2014/050162 2013-09-13 2014-09-04 Coque flottante comprenant une partie de stabilisation WO2015038003A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NO20131235 2013-09-13
NO20131235A NO337402B1 (no) 2013-09-13 2013-09-13 Et flytende skrog med stabilisatorparti

Publications (1)

Publication Number Publication Date
WO2015038003A1 true WO2015038003A1 (fr) 2015-03-19

Family

ID=51743535

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/NO2014/050162 WO2015038003A1 (fr) 2013-09-13 2014-09-04 Coque flottante comprenant une partie de stabilisation

Country Status (2)

Country Link
NO (1) NO337402B1 (fr)
WO (1) WO2015038003A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105151227A (zh) * 2015-09-28 2015-12-16 南通中远船务工程有限公司 一种圆筒型fpso船体的结构布置
WO2017186284A1 (fr) 2016-04-27 2017-11-02 Cefront Technology As Navire en mer pour la production et le stockage de produits pétroliers
WO2019011407A1 (fr) 2017-07-10 2019-01-17 Cefront Technology As Navire en mer pour la production et le stockage d'hydrocarbures
CN109263832A (zh) * 2018-09-30 2019-01-25 广船国际有限公司 一种用于驳船对中的限位工装及驳船对中的限位方法

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4014279A (en) * 1976-04-28 1977-03-29 Trw Inc. Dynamic positioning system for a vessel containing an ocean thermal energy conversion system
GB2310832A (en) * 1996-03-04 1997-09-10 Deep Oil Technology Inc Floating caisson for offshore drilling, workover, production, and/or storage
WO2002090177A1 (fr) 2001-05-10 2002-11-14 Sevan Marine As Plate-forme de forage en mer pour la prospection ou la production d'hydrocarbures
FR2847225A1 (fr) * 2002-11-15 2004-05-21 Saipem Sa Barge de grandes dimensions presentant des cavites formant cavernes dans la coque
WO2009023624A1 (fr) * 2007-08-13 2009-02-19 Shell Oil Company Systèmes et procédés pour réduire les vibrations induites par traînée et/ou vortex
WO2009107208A1 (fr) * 2008-02-27 2009-09-03 三菱重工業株式会社 Structure flottante
US20110308444A1 (en) * 2009-04-29 2011-12-22 Samsung Heavy Ind. Co., Ltd. Floating offshore structure
WO2012104308A1 (fr) 2011-02-01 2012-08-09 Sevan Marine Asa Unité de production comportant une coque ballastable symétrique en rotation et un puits central

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4995762A (en) * 1988-07-19 1991-02-26 Goldman Jerome L Semisubmersible vessel with captured constant tension buoy
US5609442A (en) * 1995-08-10 1997-03-11 Deep Oil Technology, Inc. Offshore apparatus and method for oil operations
US8579547B2 (en) * 2000-11-13 2013-11-12 Single Buoy Moorings Inc. Vessel comprising transverse skirts
NO20012087L (no) * 2001-04-27 2002-10-28 Mpu Entpr As Flytende flerbruksplattformkonstruksjon samt fremgangsmåte for oppbygning av denne

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4014279A (en) * 1976-04-28 1977-03-29 Trw Inc. Dynamic positioning system for a vessel containing an ocean thermal energy conversion system
GB2310832A (en) * 1996-03-04 1997-09-10 Deep Oil Technology Inc Floating caisson for offshore drilling, workover, production, and/or storage
WO2002090177A1 (fr) 2001-05-10 2002-11-14 Sevan Marine As Plate-forme de forage en mer pour la prospection ou la production d'hydrocarbures
FR2847225A1 (fr) * 2002-11-15 2004-05-21 Saipem Sa Barge de grandes dimensions presentant des cavites formant cavernes dans la coque
WO2009023624A1 (fr) * 2007-08-13 2009-02-19 Shell Oil Company Systèmes et procédés pour réduire les vibrations induites par traînée et/ou vortex
WO2009107208A1 (fr) * 2008-02-27 2009-09-03 三菱重工業株式会社 Structure flottante
US20110308444A1 (en) * 2009-04-29 2011-12-22 Samsung Heavy Ind. Co., Ltd. Floating offshore structure
WO2012104308A1 (fr) 2011-02-01 2012-08-09 Sevan Marine Asa Unité de production comportant une coque ballastable symétrique en rotation et un puits central

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105151227A (zh) * 2015-09-28 2015-12-16 南通中远船务工程有限公司 一种圆筒型fpso船体的结构布置
WO2017186284A1 (fr) 2016-04-27 2017-11-02 Cefront Technology As Navire en mer pour la production et le stockage de produits pétroliers
WO2019011407A1 (fr) 2017-07-10 2019-01-17 Cefront Technology As Navire en mer pour la production et le stockage d'hydrocarbures
CN110869274A (zh) * 2017-07-10 2020-03-06 希弗朗特技术股份有限公司 用于生产和储存碳氢化合物产品的近海船舶
KR20200027952A (ko) * 2017-07-10 2020-03-13 세프론트 테크놀로지 에이에스 탄화수소 생성물의 생산 및 저장을 위한 해양 선박
US10953963B2 (en) 2017-07-10 2021-03-23 Cefront Technology As Offshore vessel for production and storage of hydrocarbon products
CN110869274B (zh) * 2017-07-10 2022-03-04 希弗朗特技术股份有限公司 用于生产和储存碳氢化合物产品的近海船舶
KR102417737B1 (ko) * 2017-07-10 2022-07-05 세프론트 테크놀로지 에이에스 탄화수소 생성물의 생산 및 저장을 위한 해양 선박
CN109263832A (zh) * 2018-09-30 2019-01-25 广船国际有限公司 一种用于驳船对中的限位工装及驳船对中的限位方法
CN109263832B (zh) * 2018-09-30 2021-03-09 广船国际有限公司 一种驳船对中的限位方法

Also Published As

Publication number Publication date
NO20131235A1 (no) 2015-03-16
NO337402B1 (no) 2016-04-04

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