US20100192829A1 - Spar hull belly strake design and installation method - Google Patents

Spar hull belly strake design and installation method Download PDF

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Publication number
US20100192829A1
US20100192829A1 US12/365,811 US36581109A US2010192829A1 US 20100192829 A1 US20100192829 A1 US 20100192829A1 US 36581109 A US36581109 A US 36581109A US 2010192829 A1 US2010192829 A1 US 2010192829A1
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US
United States
Prior art keywords
strake
spar
hull
belly
spar hull
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.)
Abandoned
Application number
US12/365,811
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English (en)
Inventor
Michael Y. H. Luo
Harvey O. Mohr
Lixin Zhang
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.)
Technip Energies France SAS
Original Assignee
Technip France SAS
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 Technip France SAS filed Critical Technip France SAS
Priority to US12/365,811 priority Critical patent/US20100192829A1/en
Assigned to TECHNIP FRANCE reassignment TECHNIP FRANCE ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: LUO, MICHAEL Y. H., MOHR, HARVEY O., ZHANG, LIXIN
Priority to PCT/US2010/022364 priority patent/WO2010090942A2/fr
Priority to MYPI2011003435A priority patent/MY165996A/en
Priority to US13/147,256 priority patent/US8783198B2/en
Priority to EP10703570.1A priority patent/EP2393707B1/fr
Publication of US20100192829A1 publication Critical patent/US20100192829A1/en
Assigned to TECHNIP FRANCE reassignment TECHNIP FRANCE ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: MOHR, VERA L., ZHANG, LIXIN, LAMBRAKOS, KOSTAS FILOKTITIS, LUO, MICHAEL Y.H.
Abandoned legal-status Critical Current

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    • 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
    • B63B39/005—Equipment to decrease ship's vibrations produced externally to the ship, e.g. wave-induced vibrations
    • 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
    • B63B1/048—Hydrodynamic or hydrostatic features of hulls or of hydrofoils deriving lift mainly from water displacement with single hull with hull extending principally vertically
    • 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
    • B63B35/4406—Articulated towers, i.e. substantially floating structures comprising a slender tower-like hull anchored relative to the marine bed by means of a single articulation, e.g. using an articulated bearing
    • 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
    • B63B2035/442—Spar-type semi-submersible structures, i.e. shaped as single slender, e.g. substantially cylindrical or trussed vertical bodies

Definitions

  • Floating platforms are typically employed in water depths of about 500 ft. (approximately 152 m) and greater, and may be held in position over the well site by, as examples, mooring lines anchored to the sea floor, motorized thrusters located on the sides of the platform or both.
  • floating platforms may be more complex to operate because of their movement in response to environmental conditions, such as wind and water movement, they are generally capable of operating in substantially greater water depths than are fixed platforms.
  • Floating platforms may also be more mobile, and hence, easier to move to other well sites.
  • There are several different types of known floating platforms such as, for example, so-called “drill ships,” tension-leg platforms (TLPs), semi-submersibles, and spar platforms.
  • Spar platforms for example, comprise long, slender, buoyant hulls that give them the appearance of a column, or spar, when floating in an upright, operating position, in which an upper portion extends above the waterline and a lower portion is submerged below it. Because of their relatively slender, elongated shape, they have relatively deeper drafts, and hence, substantially better heave characteristics, e.g., much longer natural periods in heave, than other types of platforms. Accordingly, spar platforms have been thought of by some as a relatively successful platform design over the years. Examples of spar-type floating platforms used for oil and gas exploration, drilling, production, storage, and gas flaring operations may be found in the patent literature in, e.g., U.S. Pat. No.
  • spar-type platforms include some aspects that need improvement.
  • they can be relatively more complex to manage during offshore operations under some conditions than other types of platforms in terms of, for example, control over their trim and stability.
  • spar platforms may be particularly susceptible to vortex-induced vibrations (VIV), which may result from strong currents acting on the hull of the platform.
  • VIV vortex-induced vibrations
  • the provision of apparatus on the elongated hulls for vortex breaking, or controlled vortex-shedding, can reduce or eliminate this problem.
  • the spar hull is dry transported using a HLV from a remote fabrication yard to a near fabrication yard.
  • the final outfitting will be completed in a near fabrication yard.
  • the final outfitting may include removal of dry tow transportation supports and aids, installation of remaining wet tow aids and lightweight survey of the hull.
  • the hull will be wet towed to the offshore site.
  • the belly strakes can be installed in the quayside of the yard by rotating the spar hull.
  • the belly stake may need to be installed offshore due to the limited water depth of the ship channel, for example.
  • the folding strake can include one or more strake panels and support frames, each of which can, but need not, be configured to be coupled, such as rotatably, to the side of the spar hull.
  • Each panel or frame can have one or more folded or unfolded positions and the support frame can, but need not, be configured to support the strake panel, directly or otherwise, when the frame and panel are in one or more respective unfolded positions.
  • a method for installing belly strakes on a spar hull for floating vessels can include providing a floating spar having a hard tank and a belly side, transporting the spar to a deep water pit, rotating the spar so that the belly side is in a first workable position, which can be any position, and coupling at least one folding strake to the belly side of the spar.
  • a method of installing a spar hull for offshore oil and gas operations may include providing a spar hull having belly strake, wherein at least a portion of the belly strake has folded and unfolded positions, fixing the strake in the folded position, positioning the spar hull offshore in a transport position wherein the strake remains in the folded position, upending the spar hull, unfolding the strake, fixing the strake in an unfolded position and positioning the spar hull in the installed position.
  • Unfolding the strake may include unfolding one or more support frames or strake panels.
  • FIG. 3 illustrates one of many embodiments of a spar having folded belly strakes and utilizing certain aspects of the present inventions.
  • FIG. 6 illustrates one of many embodiments of a spar having unfolded strake support frames and utilizing certain aspects of the present inventions.
  • FIG. 7 illustrates one of many embodiments of a spar having unfolded strake panels and utilizing certain aspects of the present inventions.
  • FIG. 8 illustrates one of many embodiments of a spar in an installed position and utilizing certain aspects of the present inventions.
  • the hull can be rolled about its longitudinal axis, for example, 180° with its bare belly site upward in the pit, for allowing access to a portion of the hull where a strake may be coupled thereto.
  • a belly strake such as a foldable strake, can be installed on the belly side in the quayside.
  • the spar hull can be rolled back toward or to its original position with the strake and belly side toward the sea bed or other bottom of the deep water pit and towed to another cite, such as its permanent site for operations.
  • the tow can pass through a shallow water depth zone, such as a 45 feet deep channel, for example.
  • the systems and methods described herein can reduce the time and costs associated with the installation and use of belly strakes on spar hulls.
  • installing the foldable strake panels on the quayside can reduce or eliminate offshore swage, grouting, or other steps, and the time and costs associate therewith.
  • Another of many advantages of the present invention may include improvement of the dimension control associated with strakes or spar hulls.
  • the present inventions can allow both the folded support frames and folded strake panels to be unfolded in the yard, such as for performing one or more system integration tests (SITs).
  • SITs system integration tests
  • FIG. 1 illustrates one of many embodiments of a spar 100 in a deep water pit 102 and utilizing certain aspects of the present inventions.
  • Spar 100 can include a hull 104 , such as a hard tank.
  • Hull 104 can be made from any material required by a particular application and can preferably be formed from steel.
  • Spar 100 can further include strake 106 on hull 104 for vortex breaking.
  • Strake 106 can include any number of sections and any number of components, as will be further described below. Strake 106 can preferably be formed from steel, but can be made from any material in accordance with a particular application.
  • Strake 106 can be coupled to hull 104 in any manner, such as, for example, by welding, bolts, hinges, or other couplers, separately or in combination, as will be understood by one of ordinary skill in the art. Also, strake 106 can be fixed in one position, which may be any position on any location of hull 104 , or strake 106 can be dynamic, such as foldable, moveable, or otherwise. In at least one embodiment, which is but one of many, strake 106 can, but need not, be coupled along the longitudinal outside surface of hull 104 , such as in a helical fashion. One or more portions of strake 106 can be coupled, for example, in a fixed manner to hull 104 at one or more locations required by a particular application.
  • FIG. 2 illustrates one of many embodiments of spar 100 in a working position in a deep water pit 102 and utilizing certain aspects of the present inventions.
  • Spar 100 may be rotated, such as while floating in deep water pit 102 , into one or more working positions, such as that position shown in FIG. 2 .
  • spar 100 may be rotated so that belly side 108 is above water line 110 , which can allow access to belly side 108 , such as for coupling strake 106 thereto or otherwise preparing spar 100 for transport or operations in accordance with a particular application.
  • Folding strake 302 can include any number of components required by a particular application and can preferably include one or more panels 304 and one or more support frames 306 .
  • the present inventions can allow both the folded support frames 306 and folded strake panels 302 to be unfolded in the deep water pit, such as to perform SITs.
  • the support frames 306 are formed or fitted for the strake panels 302 , which can include installing bolts on the support frame, the strake supports and panels can be, for example, folded to and tied to the hard tank with temporary sea fastening.
  • FIG. 4 illustrates one of many embodiments of a spar 100 having folded belly strake 302 in a towing position and utilizing certain aspects of the present inventions.
  • spar 100 can be rotated to a transport or towing position, such as the position shown in FIG. 4 .
  • folding strake 302 or one or more components thereof, can be fitted to spar 100 in the working position and removed before transport, such as to be reinstalled once spar 100 reaches its final or operations location.
  • Folding strake 302 can have any number of folded or unfolded positions required by a particular application, and may preferably include a folded position for towing.
  • folding strake 302 can be temporarily coupled in a folded position relative to fixed strake 106 or the outer surface of hull 104 so that spar 100 can be towed, for example, through a relatively shallow draft 402 , such as a draft 402 having a floor 404 that fixed spar 106 would drag against if spar 100 were to be towed in a position other than belly side 108 down.
  • strake 106 can remain in one of many folded positions throughout transport, which may reduce or eliminate the time and costs of dry towing, such as using a HLV.
  • FIG. 6 illustrates one of many embodiments of spar 100 having unfolded strake support frames 306 and utilizing certain aspects of the present inventions.
  • FIG. 7 illustrates one of many embodiments of a spar hull having unfolded strake panels and utilizing certain aspects of the present inventions. FIGS. 6 and 7 will be described in conjunction with one another.
  • one or more strake panels 304 or support frames 306 can be unfolded, such as by hinges, and coupled in an upright position, which can include welding, bolts, nuts, or other coupling devices and methods as will be understood by one of ordinary skill in the art.
  • the unfolding and coupling can occur in any manner and in any sequence required by a particular application, including simultaneously.
  • support frames 306 can, but need not, be unfolded first, followed by strake panels 304 .
  • Panels 304 can, but need not, be coupled to frames 306 , hull 104 , or other components of spar 100 , separately or in combination.
  • one or more panels 304 or frames 306 can be coupled to fixed strake 106 , separately or in combination with other components.
  • any number of panels 304 or frames 306 can be coupled to spar 100 , including one large frame 306 or one large panel 304 .
  • each panel 304 or frame 306 can be separate, or formed separately and coupled together, as required by a particular application.
  • Folding strake 302 can be coupled in any unfolded position and, while the coupling can occur while spar 100 is in the upright or upended position, it need not, and may occur while spar 100 is in the towing or horizontal position (see, e.g., FIG. 4 ).
  • the unfolding, positioning, or coupling of strake 302 can be carried out in any manner required by a particular application, such as, for example, by hand, divers or, as another example, by ROV.
  • FIG. 8 illustrates one of many embodiments of a spar 100 in an installed position and utilizing certain aspects of the present inventions.
  • spar 100 can be positioned for operations, such as, for example, in the final or operations position shown in FIG. 8 .
  • moor lines 802 can be coupled to hull 104 or other portions of spar 100 , such as to anchor spar 100 to the sea floor.
  • one or more decks 804 or cranes 806 can be coupled to spar 100 , separately or in combination with any other drilling or operations equipment required by a particular application. While the contour of folding strake 302 is shown in FIG.
  • strake 106 , 302 is shown in FIG. 8 to be coupled in a helical fashion about spar 100 , it need not be, and can take any form or fashion.
  • strake can be folding strake or the folding strake can be folded or unfolded automatically, such as by pistons.
  • the various methods and embodiments of the spar can be included in combination with each other to produce variations of the disclosed methods and embodiments. Discussion of singular elements can include plural elements and vice-versa.

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  • Engineering & Computer Science (AREA)
  • Ocean & Marine Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Fluid Mechanics (AREA)
  • Physics & Mathematics (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Other Liquid Machine Or Engine Such As Wave Power Use (AREA)
  • Foundations (AREA)
  • Wind Motors (AREA)
US12/365,811 2009-02-04 2009-02-04 Spar hull belly strake design and installation method Abandoned US20100192829A1 (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
US12/365,811 US20100192829A1 (en) 2009-02-04 2009-02-04 Spar hull belly strake design and installation method
PCT/US2010/022364 WO2010090942A2 (fr) 2009-02-04 2010-01-28 Conception de virure de ventre de coque de spar et procédé d'installation
MYPI2011003435A MY165996A (en) 2009-02-04 2010-01-28 Spar hull belly strake design and installation method
US13/147,256 US8783198B2 (en) 2009-02-04 2010-01-28 Spar hull belly strake design and installation method
EP10703570.1A EP2393707B1 (fr) 2009-02-04 2010-01-28 Conception d'un element anti-vibratoire pour coque de plateforme spar et procede d'installation

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US12/365,811 US20100192829A1 (en) 2009-02-04 2009-02-04 Spar hull belly strake design and installation method

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US13/147,256 Continuation-In-Part US8783198B2 (en) 2009-02-04 2010-01-28 Spar hull belly strake design and installation method

Publications (1)

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US20100192829A1 true US20100192829A1 (en) 2010-08-05

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US12/365,811 Abandoned US20100192829A1 (en) 2009-02-04 2009-02-04 Spar hull belly strake design and installation method

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US (1) US20100192829A1 (fr)
EP (1) EP2393707B1 (fr)
MY (1) MY165996A (fr)
WO (1) WO2010090942A2 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20120148381A1 (en) * 2010-12-14 2012-06-14 James Allan Haney Spar hull load out method
WO2014103557A1 (fr) * 2012-12-26 2014-07-03 独立行政法人石油天然ガス・金属鉱物資源機構 Structure flottante
WO2019222825A1 (fr) * 2018-05-24 2019-11-28 Horton Do Brasil Tecnologia Offshore, Ltda. Structure d'espar offshore dotée d'amortisseurs hydrodynamiques et procédés de déploiement et d'installation de ceux-ci
GB2593519A (en) * 2020-03-26 2021-09-29 Equinor Energy As Offshore spar platform

Citations (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3360810A (en) * 1964-05-28 1968-01-02 Shell Oil Co Floating reservoir vessel of the displacement type
US3510892A (en) * 1966-11-30 1970-05-12 Automatisme Cie Gle Floating platform
US4234270A (en) * 1979-01-02 1980-11-18 A/S Hoyer-Ellefsen Marine structure
US4630968A (en) * 1983-10-17 1986-12-23 Institut Francais Du Petrole Realization procedure of a modular system particularly suitable for use off coasts
US4683832A (en) * 1984-07-30 1987-08-04 Dysarz Edward D Device and method to set and salvage structures
US4702321A (en) * 1985-09-20 1987-10-27 Horton Edward E Drilling, production and oil storage caisson for deep water
US4740109A (en) * 1985-09-24 1988-04-26 Horton Edward E Multiple tendon compliant tower construction
US4739957A (en) * 1986-05-08 1988-04-26 Advanced Aerodynamic Concepts, Inc. Strake fence flap
US5197826A (en) * 1992-10-22 1993-03-30 Imodco, Inc. Offshore gas flare system
US5230213A (en) * 1991-06-12 1993-07-27 Rohr, Inc. Aircraft turbine engine thrust reverser
US5443330A (en) * 1991-03-28 1995-08-22 Copple; Robert W. Deep water platform with buoyant flexible piles
US6148751A (en) * 1998-12-16 2000-11-21 High Seas Engineering, Llc Vibration and drag reduction system for fluid-submersed hulls
US6213045B1 (en) * 1998-08-27 2001-04-10 Steve J. Gaber Flotation system and method for off-shore platform and the like
US6244785B1 (en) * 1996-11-12 2001-06-12 H. B. Zachry Company Precast, modular spar system
US6283407B1 (en) * 1998-08-20 2001-09-04 Daimlerchrysler Ag Fuselage nose for controlling aerodynamic vehicles and method of utilizing same
US6953308B1 (en) * 2004-05-12 2005-10-11 Deepwater Technologies, Inc. Offshore platform stabilizing strakes

Patent Citations (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3360810A (en) * 1964-05-28 1968-01-02 Shell Oil Co Floating reservoir vessel of the displacement type
US3510892A (en) * 1966-11-30 1970-05-12 Automatisme Cie Gle Floating platform
US4234270A (en) * 1979-01-02 1980-11-18 A/S Hoyer-Ellefsen Marine structure
US4630968A (en) * 1983-10-17 1986-12-23 Institut Francais Du Petrole Realization procedure of a modular system particularly suitable for use off coasts
US4683832A (en) * 1984-07-30 1987-08-04 Dysarz Edward D Device and method to set and salvage structures
US4702321A (en) * 1985-09-20 1987-10-27 Horton Edward E Drilling, production and oil storage caisson for deep water
US4740109A (en) * 1985-09-24 1988-04-26 Horton Edward E Multiple tendon compliant tower construction
US4739957A (en) * 1986-05-08 1988-04-26 Advanced Aerodynamic Concepts, Inc. Strake fence flap
US5443330A (en) * 1991-03-28 1995-08-22 Copple; Robert W. Deep water platform with buoyant flexible piles
US5230213A (en) * 1991-06-12 1993-07-27 Rohr, Inc. Aircraft turbine engine thrust reverser
US5197826A (en) * 1992-10-22 1993-03-30 Imodco, Inc. Offshore gas flare system
US6244785B1 (en) * 1996-11-12 2001-06-12 H. B. Zachry Company Precast, modular spar system
US6283407B1 (en) * 1998-08-20 2001-09-04 Daimlerchrysler Ag Fuselage nose for controlling aerodynamic vehicles and method of utilizing same
US6213045B1 (en) * 1998-08-27 2001-04-10 Steve J. Gaber Flotation system and method for off-shore platform and the like
US6148751A (en) * 1998-12-16 2000-11-21 High Seas Engineering, Llc Vibration and drag reduction system for fluid-submersed hulls
US6349664B1 (en) * 1998-12-16 2002-02-26 High Seas Engineering, Llc Vibration and drag reduction system for fluid-submersed hulls
US6953308B1 (en) * 2004-05-12 2005-10-11 Deepwater Technologies, Inc. Offshore platform stabilizing strakes

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20120148381A1 (en) * 2010-12-14 2012-06-14 James Allan Haney Spar hull load out method
US8696291B2 (en) * 2010-12-14 2014-04-15 J. Ray Mcdermott, S.A. Spar hull load out method
WO2014103557A1 (fr) * 2012-12-26 2014-07-03 独立行政法人石油天然ガス・金属鉱物資源機構 Structure flottante
WO2019222825A1 (fr) * 2018-05-24 2019-11-28 Horton Do Brasil Tecnologia Offshore, Ltda. Structure d'espar offshore dotée d'amortisseurs hydrodynamiques et procédés de déploiement et d'installation de ceux-ci
GB2593519A (en) * 2020-03-26 2021-09-29 Equinor Energy As Offshore spar platform
GB2593519B (en) * 2020-03-26 2022-05-18 Equinor Energy As Offshore spar platform

Also Published As

Publication number Publication date
WO2010090942A2 (fr) 2010-08-12
WO2010090942A3 (fr) 2010-12-16
EP2393707B1 (fr) 2013-07-31
EP2393707A2 (fr) 2011-12-14
MY165996A (en) 2018-05-21

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Effective date: 20090204

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Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:LUO, MICHAEL Y.H.;MOHR, VERA L.;ZHANG, LIXIN;AND OTHERS;SIGNING DATES FROM 20110817 TO 20110824;REEL/FRAME:026834/0968

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