WO2005099377A2 - Plate-forme flottante en eaux ultra-profondes - Google Patents

Plate-forme flottante en eaux ultra-profondes Download PDF

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Publication number
WO2005099377A2
WO2005099377A2 PCT/US2005/011429 US2005011429W WO2005099377A2 WO 2005099377 A2 WO2005099377 A2 WO 2005099377A2 US 2005011429 W US2005011429 W US 2005011429W WO 2005099377 A2 WO2005099377 A2 WO 2005099377A2
Authority
WO
WIPO (PCT)
Prior art keywords
floating platform
platform
columns
pontoons
column
Prior art date
Application number
PCT/US2005/011429
Other languages
English (en)
Other versions
WO2005099377A3 (fr
Inventor
Steven J. Leverette
Oriol R. Rijken
Original Assignee
Seahorse Equipment Corporation
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 Seahorse Equipment Corporation filed Critical Seahorse Equipment Corporation
Priority to US10/599,608 priority Critical patent/US20110142545A1/en
Priority to BRPI0509646-4A priority patent/BRPI0509646A/pt
Priority to MXPA06011532A priority patent/MXPA06011532A/es
Publication of WO2005099377A2 publication Critical patent/WO2005099377A2/fr
Publication of WO2005099377A3 publication Critical patent/WO2005099377A3/fr

Links

Classifications

    • 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

Definitions

  • TLP tension leg platforms
  • tendons vertical structural mooring elements
  • tendons typically fabricated from high strength, high quality steel tubulars, and include articulated connections on the top and bottom (tendon connectors) that reduce bending moments and stresses in the tendon system.
  • TLPs have been noted in the past to be water depth limited to water depths of 3000', or 4000', or 5000', or 6000', depending on when and who is asked.
  • the primary limitation in extending the limits for TLP applications has been the cost and weight penalty for maintaining tendon stiffness to prevent natural periods of heave/pitch/roll from becoming longer than the commonly accepted 2-4 seconds. Keeping these response periods short prevents them from being excited at resonance by direct (first order) wave energy.
  • a tendon In order to maintain the same stiffness as shallower depth systems, a tendon must be increased in area by a ratio similar to the ratio of length increase. In simple terms, the tendon mass increases as the third power of the water depth.
  • the tendon As the tendon mass increases in increasing water depths, the tendon also adds to the system primary mass for heave/pitch/roll modes, and requires additional stiffness to maintain the same modal periods. As a consequence, the traditional approach to TLPs is limited by increased cost, and by decreased payload, with increasing water depth, the limit depending on the levels of optimization employed and the cost sensitivity of the application. It is therefore an object of the present invention to provide a floating platform system including a hull design to limit maximum tendon loads and aid in inhibiting resonant responses in the platform system leading to better motions for personnel, equipment and riser support, and to lighter and lower cost tendon systems.
  • Fig. 1 is a side view of a mono-column floating platform
  • Fig. 2 is a partial perspective view of a conventional four-column floating platform
  • Fig. 3 is a partial perspective view of a four-column floating platform of the present invention
  • Fig. 4 is a partial perspective view of an alternate embodiment of a four-column floating platform of the present invention
  • Fig. 5 is a table of tension responses for different floating platform configurations.
  • a mono-column floating platform generally identified by the reference numeral 10 is shown.
  • the floating platform 10 includes a column or hull member
  • the floating platform 10 is anchored to the seabottom 20 by tendons 22.
  • steel tendons are utilized to secure the floating platform to the seabottom.
  • the tendon system must be designed to operate between tolerable minimum and maximum tensions, to restrict natural resonance motions, and to limit the fatigue damage caused by each stress cycle. The latter two are typically accomplished by increasing the cross-sectional area of the steel tendon, which increases the tendon axial stiffness.
  • reducing tension response is accomplished by changing the hull form or configuration for the ultra-deepwater platform installations.
  • a mono-column TLP configuration is shown in Fig. 1.
  • Alternate configurations are shown in Figs. 2 - 4.
  • the TLP 10 of Fig. 1 (and payload) is located in a water depth of 8500 ft.
  • the axial stiffness of the tendons 22 is taken to be 300 kips/ft per tendon.
  • the alternate platform configurations of Figs. 2 - 4 include variations in hull geometry with a number of constraints to provide comparable cases to the reference TLP 10.
  • Each alternate platform configuration has the same hull weight, gyradii, payload and displacement as the reference TLP 10.
  • the location of the tendon porch is allowed to vary by configuration. It is assumed that the porches are located at the tips of the pontoons 18; pontoon lengths may vary between the configurations.
  • a four-column conventional TLP platform 30 is shown.
  • the platform 30 includes four columns 32, one at each corner, interconnected by horizontal members 34.
  • the columns 32 project above the water surface and support a platform deck thereon.
  • the platform 30 is anchored to the seabottom by tendons (not shown in the drawings), two at each column 32.
  • the draft and column/pontoon ratio are similar to the platform 10.
  • a platform 40 includes three columns 42 located at or near the distal ends of each pontoon 18. Increasing the size of these outer columns 42, while maintaining the same water plane area (reducing the central column 12), typically results in an increase of heave response and a decrease in roll/pitch response over most of the wave frequency range.
  • a platform 50 includes three battered outer columns 52 located at or near the distal ends of each pontoon 18. The slight batter of the outer-columns 52 substantially reduce the tension RMS under fatigue conditions, while the tension RMS under hurricane conditions is barely affected. There appears to be an optimum batter angle of less than 10 degrees, with a value of 6 to 8 degrees as more typical.
  • the optimum angle appears to be dependent on the volumetric ratio of pontoon and column.
  • the performance evaluation of each TLP configuration is based on the tendon tension response.
  • An estimate of the tension RMS an indicator of fatigue damage and extreme loads, is computed for a fatigue sea state and for a 100-year hurricane sea state.
  • the comparison is based on relative performance of fatigue sea state results, and relative performance of hurricane sea state results.

Abstract

L'invention concerne un système de plate-forme flottante comprenant des configurations de conception de coque permettant de limiter au maximum les charges d'armature de précontrainte, et facilitant l'inhibition de réponses résonantes dans ledit système de plate-forme, ce qui conduit à de meilleurs déplacements de personnel, d'équipement et de support à tubes prolongateurs, et à des systèmes d'armatures de précontrainte plus légers et à coûts réduits.
PCT/US2005/011429 2004-04-06 2005-04-06 Plate-forme flottante en eaux ultra-profondes WO2005099377A2 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
US10/599,608 US20110142545A1 (en) 2004-04-06 2005-04-06 Ultra-deepwater floating platform
BRPI0509646-4A BRPI0509646A (pt) 2004-04-06 2005-04-06 plataforma flutuante para águas ultraprofundas
MXPA06011532A MXPA06011532A (es) 2004-04-06 2005-04-06 Plataforma flotante de aguas ultra profundas.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US55982604P 2004-04-06 2004-04-06
US60/559,826 2004-04-06

Publications (2)

Publication Number Publication Date
WO2005099377A2 true WO2005099377A2 (fr) 2005-10-27
WO2005099377A3 WO2005099377A3 (fr) 2005-12-22

Family

ID=35150422

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2005/011429 WO2005099377A2 (fr) 2004-04-06 2005-04-06 Plate-forme flottante en eaux ultra-profondes

Country Status (4)

Country Link
US (1) US20110142545A1 (fr)
BR (1) BRPI0509646A (fr)
MX (1) MXPA06011532A (fr)
WO (1) WO2005099377A2 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2977856A1 (fr) * 2011-07-15 2013-01-18 Dcns Flotteur pour une structure offshore telle que notamment une eolienne
FR2977857A1 (fr) * 2011-07-15 2013-01-18 Dcns Support flottant pour une structure offshore telle que notamment une eolienne
JP2023116464A (ja) * 2018-01-19 2023-08-22 フレイア オフショア アーベー テンションレグ装置を備えた浮体式風力発電プラットフォーム

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2538275B (en) 2015-05-13 2018-01-31 Crondall Energy Consultants Ltd Floating production unit and method of installing a floating production unit

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3486343A (en) * 1966-09-15 1969-12-30 Brown & Root Platform for drilling wells at water locations
US4646672A (en) * 1983-12-30 1987-03-03 William Bennett Semi-subersible vessel
US5964550A (en) * 1996-05-31 1999-10-12 Seahorse Equipment Corporation Minimal production platform for small deep water reserves
US6447208B1 (en) * 1999-07-08 2002-09-10 Abb Lummus Global, Inc. Extended base tension leg substructures and method for supporting offshore platforms
US6503023B2 (en) * 2000-05-12 2003-01-07 Abb Lummus Global, Inc. Temporary floatation stabilization device and method

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3919957A (en) * 1974-04-15 1975-11-18 Offshore Co Floating structure and method of recovering anchors therefor
JPS61220994A (ja) * 1985-03-26 1986-10-01 Mitsui Eng & Shipbuild Co Ltd 半潜水式浮遊構造物
US5590982A (en) * 1994-12-23 1997-01-07 Shell Oil Company Tendon cluster array
US6666624B2 (en) * 2001-08-07 2003-12-23 Union Oil Company Of California Floating, modular deepwater platform and method of deployment

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3486343A (en) * 1966-09-15 1969-12-30 Brown & Root Platform for drilling wells at water locations
US4646672A (en) * 1983-12-30 1987-03-03 William Bennett Semi-subersible vessel
US5964550A (en) * 1996-05-31 1999-10-12 Seahorse Equipment Corporation Minimal production platform for small deep water reserves
US6447208B1 (en) * 1999-07-08 2002-09-10 Abb Lummus Global, Inc. Extended base tension leg substructures and method for supporting offshore platforms
US6503023B2 (en) * 2000-05-12 2003-01-07 Abb Lummus Global, Inc. Temporary floatation stabilization device and method

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2977856A1 (fr) * 2011-07-15 2013-01-18 Dcns Flotteur pour une structure offshore telle que notamment une eolienne
FR2977857A1 (fr) * 2011-07-15 2013-01-18 Dcns Support flottant pour une structure offshore telle que notamment une eolienne
WO2013010945A1 (fr) * 2011-07-15 2013-01-24 Dcns Flotteur pour une structure offshore telle que notamment une eolienne
WO2013010957A1 (fr) * 2011-07-15 2013-01-24 Dcns Support flottant pour une structure offshore telle que notamment une éolienne
US9216800B2 (en) 2011-07-15 2015-12-22 Dcns Float for an offshore structure such as in particular a wind turbine
US9415842B2 (en) 2011-07-15 2016-08-16 Dcns Floating support for an offshore structure, in particular such as a wind turbine
JP2023116464A (ja) * 2018-01-19 2023-08-22 フレイア オフショア アーベー テンションレグ装置を備えた浮体式風力発電プラットフォーム

Also Published As

Publication number Publication date
WO2005099377A3 (fr) 2005-12-22
US20110142545A1 (en) 2011-06-16
BRPI0509646A (pt) 2007-09-18
MXPA06011532A (es) 2007-01-16

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