US3815536A - Floating installation - Google Patents

Floating installation Download PDF

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Publication number
US3815536A
US3815536A US00264469A US26446972A US3815536A US 3815536 A US3815536 A US 3815536A US 00264469 A US00264469 A US 00264469A US 26446972 A US26446972 A US 26446972A US 3815536 A US3815536 A US 3815536A
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US
United States
Prior art keywords
platform
swell
floating installation
buoyant
installation
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.)
Expired - Lifetime
Application number
US00264469A
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English (en)
Inventor
X Duc
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.)
IFP Energies Nouvelles IFPEN
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IFP Energies Nouvelles IFPEN
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Publication of US3815536A publication Critical patent/US3815536A/en
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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
    • B63B35/4413—Floating drilling platforms, 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
    • B63B39/10—Equipment to decrease pitch, roll, or like unwanted vessel movements; Apparatus for indicating vessel attitude to decrease vessel movements by damping the waves, e.g. by pouring oil on water

Definitions

  • ABSTRACT Floating installation having a platform, at least one element providing for the buoyancy of the installation and apparatus connecting the platform to the buoyant element.
  • the element is constituted by at least one flexible, tight and deformable bag housing a determined mass of gas, which is sufficient for maintaining, during its operation, the platform and the connecting apparatus above the maximum level reached by the crest of the waves, thus reducing considerably the action of swell on the installation.
  • the present invention relates to a new floating installation and more particularly to a floating installation which is substantially protected from the action of the swell.
  • the swell exerts on the floating installation during their operation, actions which constitute a nuisance for the crew living and/or working on such installations.
  • the main object of the invention is accordingly to provide a new floating installation which does not suffer from the drawbacks of the floating installations now in use.
  • Another object of the invention is to provide a floating installation which is simultaneously protected from the different actions of swell as indicated hereinabove.
  • a floating installation comprising a platform, at least one element providing for the buoyancy of the installation and means connecting said platform to said buoyant element, wherein said element is constituted by at least one flexible, tight and deformable bag housing a determined mass of gas, which is sufficient for maintaining during its operation, said platform and said connecting means above the maximum level reached by the crest of the waves, thus considerably reducing the action of the swell on the installation.
  • FIG. 1 diagrammatically illustrates a floating installation according to the invention
  • FIGS. 2 A to 2 D diagrammatically illustrate the behaviour of the floating installation of FIG. 1 under the action of the swell;
  • FIG. 3 represents a network of curves showing the amplitudes of the vertical movements of the floating installation, as a function of size parameters of this installation;
  • FIG. 4 illustrates a particular embodiment of a floating platform according to the invention
  • FIG. 5 shows another embodiment of a floating drilling installation according to the invention
  • FIGS. 6 and 7 illustrate further embodiments of a floating installation according to the invention.
  • FIG. 1 A floating installation according to the invention is diagrammatically illustrated by FIG. 1.
  • the installation is constituted by a rigid part 1, of a weight P, maintained above the water surface 2 by a caisson 3 to which the rigid part may be secured by any known connected means diagrammatically indicated by 4.
  • the caisson 3 is constituted by a tight, flexible and defonnable bag or envelope 5, housing a determined quantity of a gas, such as, for example, air.
  • p being the pressure of the gas in the caisson, p P/S, wherein P is the weight of the assembly supported by the float and S the contact surface between the float 3 and the rigid part 1.
  • P Shp wherein P and S have the above-indicated respective meanings, h being the draught and p the specific gravity of water.
  • FIGS. 2 A to 2 D diagrammatically illustrate the behaviour of the caisson subjected to the action of swell, assuming that the rigid part of the installation is stationary with respect to the water bottom.
  • the reference L indicates the length of the caisson in the direction of propagation of the waves, shown by the arrow, the reference A indicates the crest of a wave which is propagated.
  • the waves have been considered as having a sinusoidal profile with the amplitude l, and wave length A, i.e., defined by the mathematical relationship:
  • the volume Vof the caisson is at any instant proportional to the area s which is limited by the envelope in the plane of FIGS. 2 A to 2 D.
  • a l As/L.
  • n is an integer and k is a number comprised betweenOand 1(0 k 1) n 0 n I n 5 n l0 L n:
  • n A+(A/I6) 1.98 I, 0.l2 I, 0.024 I, 0.0!2 l, n )H-(A/S) L92 I, 0.22 I, 0.044 I, 0.022 I, n A+(M4) l.8 I, 0.36 I, 0.086 I, 0.044 I, n lt+(3l ⁇ /8) 1.57 I, 0.43 I, 0.1 I, 0.052 I, n )t-HAIZ) 1.28 I, 0.427 I, 0.l 16 I, 0.06l I, n A+(5A/8) 0.94 I, 0.363 I, 0.096 I, 0.051 I, n lei-(3M4) 0.6 I, 0.257 I, 0.078 I, 0.042 I, n )cl-(7h/8) 0.274 I, 0128 I, 0.038 I, 0.021 I )1 A A 0 O 0 0 L (2 m l) (M2) m being
  • the quantity of gas housed in the deformable envelope or bag will be such that the rigid part or platform of the installation and the connecting means between the platform and the caisson be always above the crest of the waves.
  • Such deformable caissons permit the construction of floating installations such as drilling platforms, floating tanks, floating islands, barges for laying underwater pipe-lines, pontoons, ships, floating wharfs, etc.
  • a floating installation according to the invention will be well adapted for constituting offshore drilling platforms, for which it is essential to prevent the drilling column from being subjected to vertical movements.
  • the anchoring by means of cables will be easier since, on the one hand, the effect of the swell is, as already indicated, reduced to the friction of water on the wall of the caisson and, on the other hand, the ve rtical movements are of small amplitude and accordingly the variations in the tension of the cables will be small.
  • FIG. 4 is a diagrammatical and purely illustrative view of an embodiment of a floating installation according to the invention.
  • the caisson Since the direction of propagation of the swell relative to the installation might vary as a function of time, the caisson will be preferably chosen of a substantially cylindrical shape, so that it is unnecessary to give the installation a particular orientation.
  • the installation is provided with a plurality of caissons 3 a, 3 b, 3 c etc. housing at rest air under the same pressure.
  • the so-formed assembly is surrounded by a protecting grid 6 having a good transparency with respect to the swell.
  • the protecting grid is designed for preventing any deterioration of the bags from the different caissons through possible obstacles which may be encountered during the navigation.
  • FIG. 5 diagrammatically shows an embodiment of a drilling platform according to the invention.
  • the caisson has a generally annular shape allowing the provision of a free space in the center of the platform for the passage of the drill column 8 connecting the surface installation, which carries the derrick 7, to the well 9 in the water bottom 10.
  • the caisson is constituted by a plurality of piled up buoyant elements 3 a, 3 b, 3 c
  • FIG. 6 illustrates another embodiment of a floatin platform according to the invention.
  • the caisson 3 is connected to the rigid part 1 through a plurality of resilient means, such as damping elements, diagrammatically illustrated and indicated by reference numeral 11, so as to allow a reduction of the resistance to wind of the portion of the installation above the water surface.
  • the caisson 3 has been replaced by a plurality of elementary caissons 3 a, 3 b interconnected, for example, through resilient means 12.
  • the wall of the caisson is a flexible deformable wall satisfactorily withstanding sea water.
  • a floating installation comprising 'a platform, buoyant means for supporting the platform, and means connecting said platform to said buoyant means, the
  • buoyant means including at least one flexible, tight and deformable closed bag housing a determined mass of gas, which is sufficient for maintaining during its operation said platform and said connecting means above the 6 I maximum level reached by the crest of the waves, the buoyant means being responsive to the action of a swell for assuming in a vertical plane theprofile of a substantially sinusoidal curve for considerably reducing the action of the swell on the installation, the connecting means including first resilient means for enabling the buoyant means to assume in a vertical plane the profile of a substantially sinusoidal curve in response to the action of the swell, the first resilient means being located between the platform and the buoyant means.
  • buoyant means has a substantially cylindrical shape.
  • buoyant means has a substantially annular shape.
  • buoyant means include a plurality of closed bags, and further including second resilient means disposed between adjacent bags for interconnecting the plurality of bags.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ocean & Marine Engineering (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Architecture (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Earth Drilling (AREA)
  • Other Liquid Machine Or Engine Such As Wave Power Use (AREA)
  • Combined Devices Of Dampers And Springs (AREA)
  • Revetment (AREA)
US00264469A 1971-06-29 1972-06-20 Floating installation Expired - Lifetime US3815536A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7123841A FR2144075A5 (zh) 1971-06-29 1971-06-29

Publications (1)

Publication Number Publication Date
US3815536A true US3815536A (en) 1974-06-11

Family

ID=9079574

Family Applications (1)

Application Number Title Priority Date Filing Date
US00264469A Expired - Lifetime US3815536A (en) 1971-06-29 1972-06-20 Floating installation

Country Status (9)

Country Link
US (1) US3815536A (zh)
CA (1) CA974409A (zh)
DE (1) DE2231721A1 (zh)
FR (1) FR2144075A5 (zh)
GB (1) GB1353375A (zh)
IT (1) IT956886B (zh)
NL (1) NL7209001A (zh)
NO (1) NO134549C (zh)
SE (1) SE373800B (zh)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3957010A (en) * 1975-08-29 1976-05-18 Soulant Jr Herman A Stabilization system for water vehicles, platforms, and structures in wind-maintained seas
US3960100A (en) * 1975-06-02 1976-06-01 The United States Of America As Represented By The Secretary Of The Navy Pressurized ship structure for slamming loads
US4576520A (en) * 1983-02-07 1986-03-18 Chevron Research Company Motion damping apparatus
WO2001062583A2 (en) * 2000-02-22 2001-08-30 Seahorse Equipment Corporation Method and apparatus for increasing floating platform buoyancy
US20120137946A1 (en) * 2010-03-25 2012-06-07 Seok-Soon Lee Apparatus for reducing pitching and rolling motion of vessel
CN111152896A (zh) * 2020-01-13 2020-05-15 朱起源 一种带有安全舱的海上平台
CN117227922A (zh) * 2023-10-19 2023-12-15 广东海洋大学 一种悬挂式减摇装置及其工作方法

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DK304285D0 (da) * 1985-07-03 1985-07-03 Atlas Ingeniorforretningen Lejekonstruktion og fartoej med en saadan lejekonstruktion
CN112319715B (zh) * 2020-11-04 2021-10-29 河海大学 一种组合式海洋平台

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2850252A (en) * 1952-08-06 1958-09-02 Goodyear Tire & Rubber Inflatable mat structure
US3468279A (en) * 1965-12-29 1969-09-23 Robert D Hawkins Flotation apparatus
US3673975A (en) * 1970-01-26 1972-07-04 Erwin S Strauss Floating platform

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2850252A (en) * 1952-08-06 1958-09-02 Goodyear Tire & Rubber Inflatable mat structure
US3468279A (en) * 1965-12-29 1969-09-23 Robert D Hawkins Flotation apparatus
US3673975A (en) * 1970-01-26 1972-07-04 Erwin S Strauss Floating platform

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3960100A (en) * 1975-06-02 1976-06-01 The United States Of America As Represented By The Secretary Of The Navy Pressurized ship structure for slamming loads
US3957010A (en) * 1975-08-29 1976-05-18 Soulant Jr Herman A Stabilization system for water vehicles, platforms, and structures in wind-maintained seas
US4576520A (en) * 1983-02-07 1986-03-18 Chevron Research Company Motion damping apparatus
WO2001062583A2 (en) * 2000-02-22 2001-08-30 Seahorse Equipment Corporation Method and apparatus for increasing floating platform buoyancy
WO2001062583A3 (en) * 2000-02-22 2002-01-17 Seahorse Equip Corp Method and apparatus for increasing floating platform buoyancy
US20120137946A1 (en) * 2010-03-25 2012-06-07 Seok-Soon Lee Apparatus for reducing pitching and rolling motion of vessel
US8695523B2 (en) * 2010-03-25 2014-04-15 Industry-Academic Cooperation Foundation Gyeongsang National University Apparatus for reducing pitching and rolling motion of vessel
CN111152896A (zh) * 2020-01-13 2020-05-15 朱起源 一种带有安全舱的海上平台
CN117227922A (zh) * 2023-10-19 2023-12-15 广东海洋大学 一种悬挂式减摇装置及其工作方法
CN117227922B (zh) * 2023-10-19 2024-03-05 广东海洋大学 一种悬挂式减摇装置及其工作方法

Also Published As

Publication number Publication date
IT956886B (it) 1973-10-10
GB1353375A (en) 1974-05-15
FR2144075A5 (zh) 1973-02-09
NL7209001A (zh) 1973-01-03
DE2231721A1 (de) 1973-01-18
NO134549C (zh) 1976-11-03
NO134549B (zh) 1976-07-26
SE373800B (zh) 1975-02-17
CA974409A (en) 1975-09-16

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