WO2003104604A1 - Systeme de colonne montante - Google Patents

Systeme de colonne montante Download PDF

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Publication number
WO2003104604A1
WO2003104604A1 PCT/NO2003/000181 NO0300181W WO03104604A1 WO 2003104604 A1 WO2003104604 A1 WO 2003104604A1 NO 0300181 W NO0300181 W NO 0300181W WO 03104604 A1 WO03104604 A1 WO 03104604A1
Authority
WO
WIPO (PCT)
Prior art keywords
riser
riser system
anyone
intake
vessel
Prior art date
Application number
PCT/NO2003/000181
Other languages
English (en)
Inventor
Knut H. Fjell
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 AU2003238735A priority Critical patent/AU2003238735B2/en
Publication of WO2003104604A1 publication Critical patent/WO2003104604A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63J—AUXILIARIES ON VESSELS
    • B63J2/00—Arrangements of ventilation, heating, cooling, or air-conditioning
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
    • E21B17/02—Couplings; joints
    • E21B17/08—Casing joints
    • E21B17/085—Riser connections
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
    • E21B17/01—Risers
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B19/00—Handling rods, casings, tubes or the like outside the borehole, e.g. in the derrick; Apparatus for feeding the rods or cables
    • E21B19/002—Handling rods, casings, tubes or the like outside the borehole, e.g. in the derrick; Apparatus for feeding the rods or cables specially adapted for underwater drilling
    • E21B19/004—Handling rods, casings, tubes or the like outside the borehole, e.g. in the derrick; Apparatus for feeding the rods or cables specially adapted for underwater drilling supporting a riser from a drilling or production platform
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B13/00—Conduits for emptying or ballasting; Self-bailing equipment; Scuppers
    • B63B13/02—Ports for passing water through vessels' sides
    • 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
    • B63B2035/448—Floating hydrocarbon production vessels, e.g. Floating Production Storage and Offloading vessels [FPSO]
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63J—AUXILIARIES ON VESSELS
    • B63J2/00—Arrangements of ventilation, heating, cooling, or air-conditioning
    • B63J2002/005—Intakes for coolant medium other than sea chests, e.g. for ambient water
    • 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
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T70/00—Maritime or waterways transport

Definitions

  • the present invention regards freely hanging riser systems for taking up large amounts of cold seawater from large depth to an intake room or similar in a vessel that lays in a fixed position.
  • the invention is in particular relevant where a huge demand for cooling is present, such as with LNG-production from natural gas on a vessel of the type FPSO (Floating Production Storage and Offloading). More specific the invention regards freely hanging riser systems for taking up large amounts of cold seawater from large depth to an intake room on board a vessel that by spread anchoring or dynamical positioning lays fixed positioned and in principle without rotation on the sea surface.
  • patent publication NO 172681 an arrangement is described that prevents rotation of a flexible pipe, illustrating some fundamental problems with respect to riser systems.
  • the pipe to take up the cold seawater is not a specific topic, however, it is described that the pipe is flexible and preferably fabricated from reinforced synthetic material, comprising cylindrical components whose actual length is substantially equal to the radius, stiffened by hoops which are preferably fabricated from glass fiber reinforced plastic material and connected to one another by woven lanyards of a nylon-type synthetic material. (Column 7, lines 40-47). Above the pipe for intake of cold seawater are arranged pumps and other equipment which are used in connection with the power production on the platform. It is not known that a platform according to the above publication has been fabricated.
  • the system for supplying cooling water to the production processes on the vessel includes one or more seawater risers which are shown to extend between a turning unit and the seabed, and which are connected at a lower end to an anchoring means to the seabed, for instance a seawater lifting pump (page 4, lines 14-17).
  • a seawater pump is also shown to be arranged on the buoyancy unit (page 4, lines 21-22).
  • the seawater risers generally may consist of one large or several smaller risers extending down to the seabed or to a chosen depth at which the seawater temperature is sufficiently low (page 4, lines 24-26).
  • the seawater pipes between the buoyancy unit and the seabed may have the same course as the production risers or they may in general extend vertically from the buoyancy unit to the seabed. In both cases they will be kept in position at the seabed by anchoring means (page 4, lines 26-29).
  • the invention according to PCT NO00/00447 in reality regards provisions with respect to the turning unit in the vessel, and there is no guidance with respect to particular choices regarding number and dimensions of the seawater risers in particular or the seawater risers in general. There is no guidance with respect to specific methods to arrange further risers, for example production risers, in particular ways with respect to the seawater risers.
  • the above mentioned pumps appear to be obligatory in the system for seawater intake. It is mentioned that a process plant on a FPSO vessel can require intake of a cooling water amount up to 30000 m /h, which will require use of a seawater riser with a flow area corresponding to a pipe having a diameter up to about 2000 mm.
  • a riser system for taking up large amounts of cold seawater from large dept to an intake room in a vessel than in principle lays in a fixed position on the sea surface by spread anchoring or dynamical positioning, which vessel in principle is without rotation with respect to the sea surface.
  • the riser system is distinguished in that it is comprising one single riser with large flow cross section, which riser in operation extends from a lower freely hanging end at large depth from where large amounts of cold seawater are taken in through at least one opening and is passed through the riser to an upper end that is placed within said intake room, in a suspension that is elastic around a nominal suspension position.
  • the riser system preferably comprises additional risers, pipes, cables and/or buoyancy material which in principle extend parallel with the riser system and are fastened to the riser, such that the riser with connected equipment acts as one single unit.
  • the riser system preferably comprises one single round pipe having a length of about 1000 m and a diameter of 1.5 m to 5 m, whereby the riser can take up a flow rate of 11000 to more than 50000 m /h cold seawater from about 1000 m depth.
  • the riser system more preferably comprises a riser having a diameter 2.5-3.2 m, whereby the riser can take up a flow rate of 30000 to 50000 m /h cold seawater from large depth.
  • the riser has in its lower end preferably a clump weight that keeps the riser in substance vertically oriented in the ocean.
  • the clump weight has preferably several openings for intake of cold seawater to the riser, such that the clump weight also functions as a sieve.
  • the suspension of the riser in the intake room is preferably with a short flexible element between the riser and the intake room.
  • the suspension in the intake room preferably comprises rotationally symmetrical arranged elastic rubber-steel lamellae, more specific flex joints, for example of the type manufactured by Murdoch Oil States Company.
  • the suspension in the intake room is preferably suspended in a system for heave compensation, for example with a constant tension winch.
  • the riser is preferably fabricated from one single or several joined sections of corrosion protected steel pipes with external buoyancy material, or sections of fhermo polymer or other polymer reinforced with steel armouring and/or synthetic fiber armouring, for example kevlar, aramide fiber, boron fiber, carbon fiber or glass fiber, which sections of polymer pipe optionally are equipped with buoyancy material and optional fixation frames for fixing a number of external symmetrically arranged risers for natural gas, with optionally additional anchoring of the riser to the vessel from close to its upper end.
  • the riser system as water-filled preferably has buoyancy so that the clump weight and the lower end have negative buoyancy while the upper end has positive buoyancy, so that the riser naturally will take an in substance vertical position in the sea.
  • the riser is preferable fabricated from curved, long joined plates, which riser around the cross-section comprises two wide convex plates joined in one (side) end, and a smaller concave plate placed between and joined to the widest plates in their other (side) end, with a number of additional risers, cables, buoyancy material and fixation elements in substance arranged within the concave part of the smaller plate, so that the cross-section becomes torpedo like or drop formed.
  • the riser consists in principle of a load-bearing part and a part for cooling water transport, which parts are integrated or separate.
  • the riser system according to the invention is preferably connected to a FPSO- vessel with a LNG-plant, in that the riser system supplies cooling water to the LNG-plant, and wherein the riser system further comprises one or more risers for taking in natural gas to the LNG-plant, which risers for natural gas are arranged external to the riser for cooling water intake.
  • the riser system With the riser system according to the present invention it can, dependent on the embodiment, be brought up from 11000 to more than 50000 m 3 /h cold seawater for cooling in connection with the LNG-plant on a FPSO-vessel.
  • a typical LNG-plant with a production of 5 mill tons LNG per year and with a cooling water intake on typically 1000 m depth versus 50 m depth, it is achieved in a typically chosen warm water about 30 % less cooling water demand.
  • the power consumption is reduced with about 50 MW in a plant for LNG-production.
  • two gas turbines will not be required, which each costs about 250-300 millions Norwegian kroner (for example LM 6000 Nouvo Preone).
  • the riser system according to the present invention it is achieved significant advantages with respect to installation, reduced risk for collisions and easier manipulation of the components.
  • the riser system can in principle be handled as one unit.
  • the flow loss through the riser system will be reduced, in particular for embodiments with round cross section of the riser.
  • a so called "draw down effect” of only about 7-8 m pressure height, which has to be exceeded for cold seawater to flow by itself into the intake room from large depth.
  • Said pressure height corresponds to loss of pressure measured as water column because of effects of friction, temperature, pressure and salinity.
  • the water surface in the intake room accordingly has to be at least 7-8 m lower than the water surface of the sea to avoid use of pumps in the riser system, however, in practice the water surface will be kept lower, more specific at a level that ensures sufficient pressure height for the lifting pumps that are to be placed in the intake room to bring the cold cooling water further. It is obligatory that the riser system does not contain any pump, which is made possible because of the lowered water surface in the intake room.
  • FIG. 5 the riser system according to the present invention is shown, in an embodiment having additional risers for hydrocarbons, cables and pipes.
  • FIG. 1 it is shown a freely hanging riser system suspended in an intake room in a FPSO with a section of a flexible pipe.
  • intake room it is meant primarily non-turnable sea-chests or similar, or subsidiary turnable intake rooms such as a turret, which intake room can take in the riser to a room with lowered water surface for the cold seawater, which room has space for equipment to bring the cold seawater further.
  • From its upper end the riser extends to a lower end 1000 m down into the sea, where there is a number of inlets (not illustrated) for cold sea water.
  • the inner diameter of the riser is larger than or equal to 1.5 m.
  • a short flexible element, having larger flexibility than the riser, is arranged between the riser and the intake room.
  • FIGs 2, 3 and 4 show cross-sections of the suspension of the riser system.
  • Figure 2 illustrates suspension of the riser with flexible elements rotationally symmetrical arranged to a suspension collar with an integrated bell mouth formed bend restrictor below.
  • Figure 3 illustrates an embodiment with additional axial and rotational flexibility in that the suspension collar is fastened in a double elastic suspension.
  • Figure 4 illustrates an embodiment with additional flexibility in that the suspension collar in addition is fastened in a system for heave-compensation. Increased elasticity in the suspension results in an advantageous reduction of the strain on the riser and the suspension.
  • Figure 5 illustrates the riser system according to the invention with additional risers, more particular for hydrocarbons, and cables and pipes, arranged such that the riser with connected equipment acts as one single unit. Optional buoyancy bodies are not illustrated.
  • the fabrication of the riser preferably takes place at a workshop with harbour, so that the whole riser or sections thereof can be filled with air and be towed to a FPSO that can lie anchored or without anchoring in an appropriate position.
  • the installation can take place by use of a dead weight to sink down the lower end of the riser as a pendulum.
  • External equipment such as fixation frames, risers for natural gas and buoyancy material are preferably prepared and connected in advance, as far as possible.
  • handleable sections of the riser can be joined in position, be fully equipped and submerged successively down through the intake room, with lifting and handling equipment on the vessel and optionally on a crane vessel. It can be arranged rail means or similar on the outside of the hull of the vessel to manoeuvre in and pull in the riser to the intake room.
  • the lowest flow resistance for the cold seawater is achieved with a round cross- section of the riser, because of lowest ratio pipe surface/cross section for flow.
  • the riser can be prepared from curved plates that are joined, and the riser as fully equipped can be given a torpedo like or drop like cross section, with simplified fabrication and reduced drift as a result.

Landscapes

  • Engineering & Computer Science (AREA)
  • Geology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Mining & Mineral Resources (AREA)
  • Mechanical Engineering (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Fluid Mechanics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Ocean & Marine Engineering (AREA)
  • Earth Drilling (AREA)
  • Optical Record Carriers And Manufacture Thereof (AREA)
  • Thermal Transfer Or Thermal Recording In General (AREA)
  • Non-Silver Salt Photosensitive Materials And Non-Silver Salt Photography (AREA)

Abstract

L'invention concerne un système de colonne montante destiné à absorber de grandes quantités d'eau de mer froide des grandes profondeurs dans une chambre d'aspiration du récipient qui se trouve en principe en position fixe à la surface de la mer par ancrage en éventail ou par positionnement dynamique, le récipient n'étant en principe par rotatif par rapport à la surface de la mer, se distingue en ce qu'il comprend une colonne montante unique possédant une grande section transversale d'écoulement, la colonne montante en fonctionnement s'étendant d'une extrémité d'accrochage libre inférieure à une grande profondeur à partir de laquelle des grandes quantités d'eau de mer froide sont extraites par le biais d'au moins une ouverture et cette eau traverse la colonne montante jusqu'à une extrémité supérieure située à l'intérieur de la chambre d'aspiration, dans une suspension qui est élastique autour d'une position de suspension nominale. L'invention permet de réduire la demande d'eau de refroidissement.
PCT/NO2003/000181 2002-06-11 2003-06-05 Systeme de colonne montante WO2003104604A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2003238735A AU2003238735B2 (en) 2002-06-11 2003-06-05 Riser system

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NO20022773 2002-06-11
NO20022773A NO20022773A (no) 2002-06-11 2002-06-11 Stigerørsystem for opptak av store mengder kaldt sjøvann fra stort dyp

Publications (1)

Publication Number Publication Date
WO2003104604A1 true WO2003104604A1 (fr) 2003-12-18

Family

ID=19913711

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/NO2003/000181 WO2003104604A1 (fr) 2002-06-11 2003-06-05 Systeme de colonne montante

Country Status (3)

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AU (1) AU2003238735B2 (fr)
NO (1) NO20022773A (fr)
WO (1) WO2003104604A1 (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007095570A3 (fr) * 2003-08-06 2008-04-17 Syntroleum Corp Système mobile de conversion de gaz en liquide et procédé
FR2951800A1 (fr) * 2009-10-22 2011-04-29 Total Sa Conduite sous-marine appliquee a l'exploitation de l'energie thermique des mers
WO2016144158A1 (fr) * 2015-02-23 2016-09-15 Sbm Schiedam B.V. Système d'admission d'eau et navire flottant équipé d'un tel système
WO2020055264A1 (fr) * 2018-09-10 2020-03-19 Equinor Energy As Eau de refroidissement pour plate-forme en mer
US10967949B2 (en) 2016-11-10 2021-04-06 Single Buoy Moorings, Inc. Seawater intake riser interface with vessel hull
WO2021148834A1 (fr) * 2020-01-20 2021-07-29 Total Se Colonne montante de prise d'eau suspendue librement, et plate-forme équipée d'une telle colonne montante

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4332509A (en) * 1979-06-18 1982-06-01 Coflexip Riser pipe system for collecting and raising petroleum produced from an underwater deposit
US4350014A (en) * 1978-11-30 1982-09-21 Societe Anonyme Dite: Sea Tank Co. Platform for utilization of the thermal energy of the sea
US4497342A (en) * 1983-06-20 1985-02-05 Lockheed Missiles & Space Company, Inc. Flexible retractable cold water pipe for an ocean thermal energy conversion system
US4566824A (en) * 1982-11-19 1986-01-28 Commissariat A L'energie Atomique System for drilling from a water surface, which is insensitive to the swell
US4708525A (en) * 1982-02-25 1987-11-24 Amoco Corporation Multiterminators for riser pipes
US5794700A (en) * 1997-01-27 1998-08-18 Imodco, Inc. CAM fluid transfer system

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4350014A (en) * 1978-11-30 1982-09-21 Societe Anonyme Dite: Sea Tank Co. Platform for utilization of the thermal energy of the sea
US4332509A (en) * 1979-06-18 1982-06-01 Coflexip Riser pipe system for collecting and raising petroleum produced from an underwater deposit
US4708525A (en) * 1982-02-25 1987-11-24 Amoco Corporation Multiterminators for riser pipes
US4566824A (en) * 1982-11-19 1986-01-28 Commissariat A L'energie Atomique System for drilling from a water surface, which is insensitive to the swell
US4497342A (en) * 1983-06-20 1985-02-05 Lockheed Missiles & Space Company, Inc. Flexible retractable cold water pipe for an ocean thermal energy conversion system
US5794700A (en) * 1997-01-27 1998-08-18 Imodco, Inc. CAM fluid transfer system

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007095570A3 (fr) * 2003-08-06 2008-04-17 Syntroleum Corp Système mobile de conversion de gaz en liquide et procédé
FR2951800A1 (fr) * 2009-10-22 2011-04-29 Total Sa Conduite sous-marine appliquee a l'exploitation de l'energie thermique des mers
WO2016144158A1 (fr) * 2015-02-23 2016-09-15 Sbm Schiedam B.V. Système d'admission d'eau et navire flottant équipé d'un tel système
US10189553B2 (en) 2015-02-23 2019-01-29 Single Buoy Moorings Inc. Water intake system and floating vessel equipped with such a system
US10967949B2 (en) 2016-11-10 2021-04-06 Single Buoy Moorings, Inc. Seawater intake riser interface with vessel hull
WO2020055264A1 (fr) * 2018-09-10 2020-03-19 Equinor Energy As Eau de refroidissement pour plate-forme en mer
WO2021148834A1 (fr) * 2020-01-20 2021-07-29 Total Se Colonne montante de prise d'eau suspendue librement, et plate-forme équipée d'une telle colonne montante

Also Published As

Publication number Publication date
NO315909B1 (no) 2003-11-10
NO20022773A (no) 2003-11-10
AU2003238735B2 (en) 2008-04-17
NO20022773D0 (no) 2002-06-11
AU2003238735A1 (en) 2003-12-22

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