EP1053171A1 - Navire a ouvertures verticales pour operations de forage en mer - Google Patents

Navire a ouvertures verticales pour operations de forage en mer

Info

Publication number
EP1053171A1
EP1053171A1 EP99909423A EP99909423A EP1053171A1 EP 1053171 A1 EP1053171 A1 EP 1053171A1 EP 99909423 A EP99909423 A EP 99909423A EP 99909423 A EP99909423 A EP 99909423A EP 1053171 A1 EP1053171 A1 EP 1053171A1
Authority
EP
European Patent Office
Prior art keywords
deck
ship
hull bottom
area
areas
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.)
Granted
Application number
EP99909423A
Other languages
German (de)
English (en)
Other versions
EP1053171B1 (fr
Inventor
Kare Syvertsen
Arne Smedal
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.)
Hitec Systems AS
Original Assignee
Hitec Systems AS
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 Hitec Systems AS filed Critical Hitec Systems AS
Publication of EP1053171A1 publication Critical patent/EP1053171A1/fr
Application granted granted Critical
Publication of EP1053171B1 publication Critical patent/EP1053171B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B3/00—Hulls characterised by their structure or component parts
    • B63B3/14—Hull parts
    • B63B3/48—Decks
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B3/00—Hulls characterised by their structure or component parts
    • B63B3/14—Hull parts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B3/00—Hulls characterised by their structure or component parts
    • B63B3/14—Hull parts
    • B63B2003/147—Moon-pools, e.g. for offshore drilling vessels

Definitions

  • the present invention relates to a ship for use in offshore operations which has one or more vertical openings in the hull, so-called moonpools. Openings in the hull of a ship which, e.g., is to be used as a drill ship, are quite common today, occurring both singly and severally, and are used for a variety of tasks. In some situations it is desirable to arrange fixedly mounted equipment in proximity to such a moonpool in order to carry out specific tasks. This could be, e.g., a derrick, a crane arrangement for launching and taking up, for instance, ROV, or other equipment for the execution of operations through these openings in the hull.
  • the openings are usually arranged along the longitudinal centre line of the ship and may be of a variety of cross-sectional shapes and sizes, but often they are rectangular or approximately rectangular, and if there are several openings, these are arranged one after the other along the longitudinal centre line of the ship and may have the same cross- sectional shape and size. If the openings are not used for specific tasks, they may be built into a ship to have an impact on its motions
  • the rectangular openings have an effect on the stress distribution in, ter alia, the deck and hull bottom plates when the ship is exposed to stresses caused by waves and other loads. In some areas, notches may occur which result in concentrations of stress, where the level of stress may be considerably higher than the average stresses in the deck or hull bottom plates. Stress concentrations will occur in particular at the corners of rectangular openings, even though the corners are designed so as to minimise notch effect. It is also possible to alleviate the situation by designing bracket plates and local reinforcements appropriately, but the stress concentration factor will often be high, and a stress concentration factor of 2 is by no means unusual.
  • the load picture and the stress distribution will be more complicated and uncertain when, e.g., a derrick for use through the hull opening is to be fixedly mounted in the area of stress concentrations, or in proximity to such areas.
  • stresses and stress concentration should be the lowest and most uniform possible with no local stress concentrations, or the potential for these. This may also result in designs that are simpler to produce, which in turn will help to reduce costs in connection with the production of the ship.
  • One of these is to reduce the notch effect in the deck and hull bottom plates, and the other solution, towards which the present invention is directed, concentrates on the positioning and design of the deck and hull bottom plates at the site of cut-outs which, e.g., are rectangular, in relation to the transverse neutral axis of the ship.
  • the invention relates to a ship as disclosed in the preamble of claim 1, having the characteristics that are disclosed in the characterising clause of claim 1. Additional embodiments of the invention are disclosed in the other claims.
  • the deck plates (on the upper deck) and the bottom plates on the side of the moonpool will be continuous without any cut-outs which result in notches and thus stress concentrations.
  • Fig. 1 is a lateral sectional view of a hull with three moonpools taken through the centre line of the ship, wherein the deck and hull bottom plates between each moonpool are displaced in accordance with the present invention
  • Fig. 2 is a lateral sectional view of a ship with one moonpool taken through the centre line of the ship, wherein the deck and hull bottom plates abaft of and forward of the moonpool are displaced in accordance with an embodiment of the present invention.
  • Fig. 3 is a lateral sectional view of a ship with one moonpool taken through the centre line, wherein the deck and hull bottom plates are displaced in accordance with an embodiment of the present invention
  • Fig. 4 is a top view of the hull as shown in Fig. 1 ;
  • Fig. 5 is a top view of the hull shown in Fig. 2;
  • Fig. 6 is a top view of the hull shown in Fig. 3;
  • Fig. 7 is a transverse section in the centre of a moonpool of a ship having a double bottom and double deck, wherein the deck and hull bottom plates are arranged in accordance with the present invention
  • Fig. 8 is a transverse section in the centre of a moonpool of a ship having a double bottom and double deck, wherein the deck and hull bottom plates are arranged in accordance with the present invention
  • Fig. 9 is a transverse section in the centre of a moonpool of a ship having a single bottom and single deck, wherein the deck and hull bottom plates are arranged in accordance with the present invention
  • Fig.10 is a transverse section in the centre of a moonpool of a ship having a double bottom but not a double deck.
  • the deck plate at the moonpool is displaced in accordance with the present invention.
  • Fig. 1 One embodiment of the present invention is indicated in Fig. 1 in a lateral sectional view through the centre line of a hull having three through-going vertical openings 2, also known as moonpools, positioned one after the other in the longitudinal direction.
  • the deck area 8 and the hull bottom area 4 between each of the openings 2 have been displaced in such a way that the deck plates 8 are displaced down towards the ship's transverse neutral axis 20, and similarly the hull bottom plates 4 are displaced relative to the rest of the ship's hull bottom, towards the ship's transverse neutral axis 20.
  • Fig. 4 where the same construction as that in Fig.
  • FIG. 1 is shown in a top view, wherein the openings, or the moonpools 2, are positioned along the centre line of the ship with deck areas 8 therebetween.
  • the hatched deck areas 8 have thus been moved to an area where the average stress level is lower, and as a result of this positioning, the impact of the notch effect at corners etc. will be reduced.
  • Fig. 2 is a lateral sectional view of a hull with a moonpool 2 taken through the centre line.
  • the deck area on each side of the moonpool is divided into the areas 9 and 10, both of which are displaced towards the ship's transverse neutral axis 20 relative to the rest of the deck.
  • the hull bottom plates 5 and 6 have also been displaced in a vertical direction towards the transverse neutral axis 20 of the ship.
  • the solution in Fig. 2 differs from that in Fig. 1 in that in this case it is the deck and hull bottom plate areas in the forward and after edge of the moonpool 2 that have been displaced, whilst in Fig.
  • Both the displacement of the deck plates 9 and 10 and the displacement of the hull bottom plates 5 and 6 are arranged stepwise so that the deck plates 9 and the hull bottom plates 5 are displaced further in a vertical direction towards the ship's transverse neutral axis 20 than the deck plates 10 and the hull bottom plates 6. This is done to further reduce the notch effect, thereby helping to reduce the stress concentrations in the construction of the deck area and hull bottom area in addition to the displacement thereof towards an area having a lower average stress level.
  • FIG. 3 shows a lateral sectional view of a hull with one moonpool 2 taken through the centre line, and the deck areas on the after and forward sides of the moonpool are displaced in accordance with the invention at deck areas 1 la and 1 lb. Furthermore, the hull bottom plate areas on the forward and after sides of the moonpool 2 are displaced at the hull bottom plates 7a and 7b.
  • the junction between the displaced areas and the rest of the surrounding deck and hull bottom plate areas is indicated by an approximately linear inclined plane 7b, 1 lb, which is also a design model for reducing the notch effect in the areas around the moonpool.
  • the degree of displacement of the deck plate or hull bottom plate towards the ship's transverse neutral axis 20, in accordance with the present invention, may vary according to the average stress level that is desirable, whilst the practical considerations relating to the design of the ship will prevail with respect to the positioning of these deck and hull bottom plates.
  • Fig. 7 shows a transverse section of a ship having a double bottom and "double" deck and a centrally located moonpool 2.
  • the deck area and hull bottom area at the forward and/or after side of the moonpool are displaced relative to the rest of the deck area and hull bottom area towards the ship's transverse neutral axis.
  • this has been done by removing the upper deck plate and lower hull bottom plate in the double deck and double bottom construction, thereby displacing the deck plate area and the hull bottom area in the vertical direction to the position of the lower deck plate and the upper hull bottom plate.
  • the local stress notches around the moonpool have been moved to a level where the average stress level in the cross section is lower. If this displacement achieves a reduction in the average stress level of 20-40%, it could at a rough estimate have the effect of increasing fatigue life by something in the range of 100 to 200%.
  • Fig. 8 also shows a transverse section of a hull having a moonpool 2 wherein there is provided both a double deck and a double bottom.
  • the deck area and the hull bottom area on each side of the moonpool have been displaced in the vertical direction towards the ship's transverse neutral axis by placing a separate deck level between the upper and lower deck in the double deck configuration, and also a separate hull bottom level between the upper and lower bottom in the double bottom construction.
  • Fig. 9 shows a transverse section of a hull with moonpool 2, wherein there is provided a single deck and a single hull bottom.
  • the displacement of the deck area and hull bottom area on each side of the moonpool has not been related to any lower deck levels or upper hull bottom levels, and the advantageous effect of the invention has been achieved here simply by displacing a part of the deck area and the hull bottom area in the vertical direction towards the transverse neutral axis of the ship.
  • the displacement of the deck area and the hull bottom area need not be symmetrical by their being displaced an equal distance towards the transverse neutral axis.
  • it is not necessary to displace both deck area and hull bottom area which is illustrated in Fig. 10.
  • This figure shows a transverse section of a hull with moonpool 2 where only the deck area has been displaced in the vertical direction towards the ship's transverse neutral axis.
  • a ship having one or more moonpools wherein one or more of the areas between these moonpools may be displaced in the vertical direction towards the ship's transverse neutral axis.
  • the displacement need not be symmetrical about the neutral axis, i.e., that the deck plate and hull bottom plate are not necessarily displaced an equal distance, or that only one of them is displaced in the vertical direction.
  • it may be appropriate to have different vertical displacement between the different moonpools.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Ocean & Marine Engineering (AREA)
  • Butt Welding And Welding Of Specific Article (AREA)
  • Vibration Prevention Devices (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)
  • Foundations (AREA)
  • Earth Drilling (AREA)
  • Buildings Adapted To Withstand Abnormal External Influences (AREA)

Abstract

L'invention concerne un navire pour opérations de forage en mer, dont la coque comporte une ou plusieurs ouvertures (trappes) verticales. Dans cette configuration, les parties basses du pont et/ou de la coque comprises entre ces ouvertures et/ou sinon sensiblement adjacentes auxdites ouvertures sont déplacées par rapport au reste des parties basses du pont et/ou de la coque, de manière à occuper une position plus proche de l'axe transversal neutre du navire. La zone comprise entre ces autres parties basses et, sensiblement, la ou les parties basses déplacées est progressivement échelonnée. Selon une variante, la zone entre la ou les parties basses déplacées au niveau des ouvertures du navire et les autres parties basses peut comporter un ou plusieurs échelons, ou bien avoir une forme de jonction approximativement linéaire ou courbe.
EP99909423A 1998-02-05 1999-02-03 Navire a ouvertures verticales pour operations de forage en mer Expired - Lifetime EP1053171B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
NO980498A NO308348B1 (no) 1998-02-05 1998-02-05 Skip for offshore operasjoner, med vertikale Õpninger
NO980498 1998-02-05
PCT/NO1999/000034 WO1999039971A1 (fr) 1998-02-05 1999-02-03 Navire a ouvertures verticales pour operations de forage en mer

Publications (2)

Publication Number Publication Date
EP1053171A1 true EP1053171A1 (fr) 2000-11-22
EP1053171B1 EP1053171B1 (fr) 2003-10-22

Family

ID=19901632

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99909423A Expired - Lifetime EP1053171B1 (fr) 1998-02-05 1999-02-03 Navire a ouvertures verticales pour operations de forage en mer

Country Status (14)

Country Link
EP (1) EP1053171B1 (fr)
JP (1) JP2002502761A (fr)
KR (1) KR20010040670A (fr)
CN (1) CN1119259C (fr)
AU (1) AU747520B2 (fr)
BR (1) BR9910888A (fr)
CA (1) CA2319487A1 (fr)
DE (1) DE69912244T2 (fr)
ES (1) ES2211054T3 (fr)
NO (1) NO308348B1 (fr)
PL (1) PL342664A1 (fr)
PT (1) PT1053171E (fr)
RU (1) RU2243128C2 (fr)
WO (1) WO1999039971A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016178575A1 (fr) * 2015-05-04 2016-11-10 Gustomsc Resources B.V. Navire pourvu d'un puits central

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101159196B1 (ko) * 2008-10-27 2012-06-25 삼성중공업 주식회사 문풀 및 이를 구비한 시추선
CN101725162B (zh) * 2008-10-10 2011-11-16 鄂州市三祥机械有限公司 井式抓斗挖砂、清淤船

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4081163A (en) * 1976-10-04 1978-03-28 Guinn David C Blow out preventer handling system
US4281716A (en) * 1979-08-13 1981-08-04 Standard Oil Company (Indiana) Flexible workover riser system

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9939971A1 *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016178575A1 (fr) * 2015-05-04 2016-11-10 Gustomsc Resources B.V. Navire pourvu d'un puits central
NL2014763A (en) * 2015-05-04 2016-11-10 Gustomsc Resources Bv A vessel provided with a moon pool.
US10730589B2 (en) 2015-05-04 2020-08-04 Gustomsc B.V. Vessel provided with a moon pool

Also Published As

Publication number Publication date
CA2319487A1 (fr) 1999-08-12
CN1295523A (zh) 2001-05-16
KR20010040670A (ko) 2001-05-15
RU2243128C2 (ru) 2004-12-27
CN1119259C (zh) 2003-08-27
AU2862599A (en) 1999-08-23
AU747520B2 (en) 2002-05-16
NO980498L (no) 1999-08-06
BR9910888A (pt) 2001-04-17
PL342664A1 (en) 2001-07-02
DE69912244D1 (de) 2003-11-27
JP2002502761A (ja) 2002-01-29
PT1053171E (pt) 2004-02-27
NO980498D0 (no) 1998-02-05
NO308348B1 (no) 2000-09-04
EP1053171B1 (fr) 2003-10-22
ES2211054T3 (es) 2004-07-01
WO1999039971A1 (fr) 1999-08-12
DE69912244T2 (de) 2004-08-26

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