NL2009676C2 - Semi-submersible arctic waters drilling vessel and method. - Google Patents

Semi-submersible arctic waters drilling vessel and method. Download PDF

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Publication number
NL2009676C2
NL2009676C2 NL2009676A NL2009676A NL2009676C2 NL 2009676 C2 NL2009676 C2 NL 2009676C2 NL 2009676 A NL2009676 A NL 2009676A NL 2009676 A NL2009676 A NL 2009676A NL 2009676 C2 NL2009676 C2 NL 2009676C2
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NL
Netherlands
Prior art keywords
rov
moonpool
vessel
shaft
ring pontoon
Prior art date
Application number
NL2009676A
Other languages
Dutch (nl)
Inventor
Joop Roodenburg
Diederick Bernardus Wijning
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Itrec Bv
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 Itrec Bv filed Critical Itrec Bv
Priority to NL2009676A priority Critical patent/NL2009676C2/en
Priority to PCT/NL2013/050731 priority patent/WO2014065654A1/en
Application granted granted Critical
Publication of NL2009676C2 publication Critical patent/NL2009676C2/en

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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 
    • 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 
    • 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
    • B63B1/041—Hydrodynamic or hydrostatic features of hulls or of hydrofoils deriving lift mainly from water displacement with single hull with disk-shaped hull
    • 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
    • B63G—OFFENSIVE OR DEFENSIVE ARRANGEMENTS ON VESSELS; MINE-LAYING; MINE-SWEEPING; SUBMARINES; AIRCRAFT CARRIERS
    • B63G8/00—Underwater vessels, e.g. submarines; Equipment specially adapted therefor
    • B63G8/001—Underwater vessels adapted for special purposes, e.g. unmanned underwater vessels; Equipment specially adapted therefor, e.g. docking stations
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02B—HYDRAULIC ENGINEERING
    • E02B17/00—Artificial islands mounted on piles or like supports, e.g. platforms on raisable legs or offshore constructions; Construction methods therefor
    • E02B17/0017—Means for protecting offshore constructions
    • E02B17/0021—Means for protecting offshore constructions against ice-loads
    • 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
    • B63B2001/044—Hydrodynamic or hydrostatic features of hulls or of hydrofoils deriving lift mainly from water displacement with single hull with a small waterline area compared to total displacement, e.g. of semi-submersible type
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B2241/00—Design characteristics
    • B63B2241/02—Design characterised by particular shapes
    • B63B2241/10—Design characterised by particular shapes by particular three dimensional shapes
    • B63B2241/12—Design characterised by particular shapes by particular three dimensional shapes annular or toroidal
    • 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
    • B63B35/08—Ice-breakers or other vessels or floating structures for operation in ice-infested waters; Ice-breakers, or other vessels or floating structures having equipment specially adapted therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63G—OFFENSIVE OR DEFENSIVE ARRANGEMENTS ON VESSELS; MINE-LAYING; MINE-SWEEPING; SUBMARINES; AIRCRAFT CARRIERS
    • B63G8/00—Underwater vessels, e.g. submarines; Equipment specially adapted therefor
    • B63G8/001—Underwater vessels adapted for special purposes, e.g. unmanned underwater vessels; Equipment specially adapted therefor, e.g. docking stations
    • B63G2008/002—Underwater vessels adapted for special purposes, e.g. unmanned underwater vessels; Equipment specially adapted therefor, e.g. docking stations unmanned
    • B63G2008/008—Docking stations for unmanned underwater vessels, or the like

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Ocean & Marine Engineering (AREA)
  • Combustion & Propulsion (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Fluid Mechanics (AREA)
  • Physics & Mathematics (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Architecture (AREA)
  • Earth Drilling (AREA)

Abstract

A semi-submersible arctic waters drilling vessel, said vessel comprising a deckbox structure (2), a ring pontoon (3), and multiple columns (5) extending upward from the ring pontoon and supporting thereon the deckbox structure. The vessel is provided with at least one ROV system, comprising a subsea remotely operated vehicle (ROV) (15), a dedicated ROV moonpool shaft (20,22), which extends from a bottom end opening (21) of the moonpool shaft upwards to an above waterline ROV maintenance garage (25), and an ROV system winch (30). The ROV moonpool shaft (20,22) is provided with a side opening (23) that is located in the inner circumferential wall (3c) of the ring pontoon, so that the ROV can be launched and recovered via said side opening, e.g. in case the bottom end opening is closed due to the vessel sitting with the bottom (3a) of the ring pontoon on a seabed (9)..

Description

P31395NL00
SEMI-SUBMERSIBLE ARCTIC WATERS DRILLING VESSEL AND METHOD
The present invention relates to a semi-submersible arctic waters drilling vessel and method for performing ROV supported subsea operations with such a drilling vessel.
An example of a semi-submersible arctic waters drilling vessel is disclosed in 5 WO2012/005587. This vessel comprises: - a deckbox structure, - a ring pontoon, which ring pontoon has an annular pontoon body with a bottom, an outer circumferential wall, and an inner circumferential wall forming an eye opening of the ring pontoon, and 10 - multiple columns extending upward from the ring pontoon and supporting thereon the deckbox structure.
The known vessel has a water ballast system comprising ballast tanks allowing to ballast the vessel, e.g. to place the vessel at distinct ice-breaking and water draft waterlines.
15
The deckbox structure of the known vessel is provided with a drilling moonpool and the vessel comprises a drilling installation with a drilling tower to perform drilling operation along one or multiple firing lines through said moonpool and the eye opening of the ring pontoon.
20 In the field of drilling vessels it is desirable to provide at least one ROV system on the drilling vessel in order to have the capability to use a subsea ROV.
The present invention aims to provide an ROV system that is specifically suited for integration in a semi-submersible arctic waters drilling vessel of the type according to the 25 preamble of claim 1. It is believed that existing ROV system do not offer the desired versatility for such integration.
The present invention provides a semi-submersible arctic waters drilling vessel which is characterized in that the vessel is provided with at least one ROV system, said ROV system 30 comprising: - a subsea remotely operated vehicle (ROV), - a dedicated ROV moonpool shaft, which extends from a bottom end opening of the moonpool shaft upwards to an above waterline ROV maintenance garage, 2 - an ROV system winch allowing the launch and recovery of the ROV, and in that the ROV moonpool shaft is provided with a side opening that is located in the inner circumferential wall of the ring pontoon, so that the ROV can be launched and 5 recovered via said side opening.
The dedicated moonpool shaft avoids any interference of drilling equipment in the one or more firing lines or associated equipment (e.g. riser tensioner) with the launch and recovery of the ROV.
10
This embodiment of the ROV system allows for use of the ROV when - in shallow water -the vessel is ballasted so as to sit with its bottom of the ring pontoon on the seabed. In this situation the bottom end opening of the ROV moonpool shaft will be closed, yet the side opening will then still be accessible for launch and recovery of the ROV.
15
In an embodiment the moonpool shaft has a vertical shaft section upward from the bottom end opening, and a lateral ROV shaft section connects to said vertical shaft section and extends laterally inward to the side opening. In another embodiment, the lateral shaft is open from below. In yet another embodiment the moonpool shaft extends directly adjacent the 20 inner wall of the ring pontoon, thereby obviating the need for a lateral ROV shaft section. In the latter version one can even envisage that the bottom end opening and the side opening are combined to form a single continuous opening with a bottom portion in the bottom of the ring pontoon and a side portion in the inner wall of the ring pontoon.
25 In an embodiment the dedicated moonpool shaft extends upward through the ring pontoon, and preferably upward through a column, wherein the maintenance garage is located in the deckbox structure. Preferably the winch is located in or near the maintenance garage.
In a preferred embodiment the ROV system comprises a cage with a tether management 30 device including a tether, and the ROV is tethered via said tether to the cage, the cage being adapted to receive the ROV.
In a preferred embodiment the cage is a side entry cage having a side entry docking space for the ROV, the system preferably being embodied to align the side entry docking space 35 with the side opening of the moonpool shaft, or the lateral shaft section leading to said side opening, for launch and recovering of the ROV via said side opening.
3
In an embodiment the ROV system comprises a cursor device that travels in the moonpool shaft along one or more vertical guide rails for the cursor device, the cursor device and cage being adapted to mate so that the cursor device positions the cage within the moonpool shaft, preferably at least when passing the water-air interface in the moonpool shaft.
5
In an embodiment the maintenance garage system comprises one or more mobile hatches that are movable over the moonpool shaft underneath the fully retrieved ROV.
In an embodiment the vessel comprises two ROV systems at diametrically opposed position 10 of the ring pontoon.
The ring pontoon, columns, and deckbox structure are preferably embodied as described in W02012/005587 which is herein incorporated by reference.
15 The present invention also relates to a method for performing ROV supported subsea operations with a semi-submersible arctic waters drilling vessel according to the invention, wherein the ROV is launched and retrieved via the side opening of the moonpool shaft.
In particular the present invention envisages a method performed in shallow arctic water, 20 wherein the vessel is ballasted so as sit with the bottom of the ring pontoon on the seabed so that the bottom end opening of the moonpool shaft is closed by the seabed, and wherein the ROV is launched and retrieved via the side opening of the moonpool shaft in order to perform ROV supported subsea operations.
25 The invention will now be explained with reference to the drawings. In the drawings:
Fig. 1 schematically shows in elevational cross-section an embodiment of a semi-submersible arctic waters drilling vessel according to the invention;
Fig. 2 shows the tween deck layout of the vessel of figure 1, 30 Fig. 3 shows on an enlarged scale the area of vessel of figure 1 with the ROV system, the ROV being deployed vertically from moonpool shaft of the vessel,
Fig. 4 shows the view of figure 3 with the ROV being deployed via the side opening of the moonpool shaft,
Fig. 5 shows the oppositely located ROV system of the vessel of figure 1 with the ROV fully 35 recovered into the maintenance garage.
4
Figure 1 shows a semi-submersible arctic waters drilling vessel 1, said vessel comprising: - a deckbox structure 2, here with a main deck 2a, a tween deck 2b, and a lower deck 2c; - a ring pontoon 3, which ring pontoon has an annular pontoon body with a bottom 3a, an outer circumferential wall 3b, and an inner circumferential wall 3c forming an eye opening 4 5 of the ring pontoon 3, - multiple columns 5 extending upward from the ring pontoon 3 and supporting thereon the deckbox structure 2.
The vessel comprises a water ballast system with ballast tanks 6, 7 allowing to ballast the 10 vessel 1, e.g. allowing to sit the vessel in shallow water on seabed 9 as depicted in figure 1.
The deckbox 2 is provided with a drilling moonpool 10.
The vessel comprises a drilling installation with a drilling tower 11 to perform drilling 15 operation along one or multiple firing lines 12 through the moonpool 10 and the eye opening 4 of the ring pontoon 3.
Here, by way of example, the seabed 9 has been locally provided with a recess 9a with the contour of the ring pontoon 3. A wellhead and BOP 13 (Blow Out Preventer) placed thereon 20 are shown. As is preferred the BOP does not extend higher than the top of the ring pontoon 3 thereby the ring pontoon 3 affording a protected area for the BOP 13.
The ring pontoon 3, columns 5, and deckbox structure 2 are preferably embodied as described in W02012/005587 which is herein incorporated by reference.
25
The vessel 1 is provided with two similar ROV systems at diametrically opposite positions.
Each ROV system comprises: - a subsea remotely operated vehicle 15 (ROV), 30 - a dedicated ROV moonpool shaft 20, which extends from a bottom end opening 21 of the moonpool shaft 20 upwards to an above waterline ROV maintenance garage 25, - an ROV system winch 30 allowing the launch and recovery of the ROV 15.
In this example, as is preferred, the moonpool shaft 20 has a vertical shaft section from the 35 bottom opening 21 all the way upward to the garage 25.
5
As can be seen a lateral shaft section 22 connects to the vertical shaft section and extends laterally inward to a side opening 23 of the ROV moonpool shaft that is located in the inner circumferential wall 3b of the ring pontoon 3.
5 In general the provision of the side opening 23, here with the lateral shaft section 22, allows the ROV 15 to be launched and recovered via said side opening 23, e.g. - as shown in figure 1 - in case the bottom end opening 21 is closed due to the vessel 1 sitting with the bottom of the ring pontoon on the seabed 9 for drilling operations in shallow arctic water.
10 The moonpool shaft 20 extends upward through the ring pontoon 3 and upward through a column 5. The maintenance garage 25 is located in the deckbox structure 2.
In the figures it is illustrated that the ROV system comprises a cage 26 with a tether management device including a tether 27. The ROV 15 is tethered via said tether 27 to the 15 cage 26. The cage 26 is adapted to receive the ROV 15.
As is preferred the cage 26 is a side entry cage having a side entry docking space 26a for the ROV 15.
20 The system is adapted to align the side entry docking space 26a with the side opening 23, here with the shaft section 22, of the moonpool shaft 20 for launch and recovering of the ROV via said side opening 23.
It is illustrated here that the ROV system comprises a cursor device 28 that travels in the 25 moonpool shaft 20 along one or more vertical guide rails 29 for the cursor device 28. The cursor device 28 and the cage 26 are adapted to mate so that the cursor device positions the cage 26 within the moonpool shaft 20, preferably at least when passing the water-air interface in the moonpool shaft.
30 In an embodiment the maintenance garage system comprises on or more mobile hatches that are movable over the moonpool shaft 20 underneath the fully retrieved ROV (see figure 5).

Claims (10)

1. Half-afzinkbaar boorvaartuig voor arctische wateren, welk vaartuig omvat: - een deckboxconstructie (2); 5. een ring ponton (3), welk ring ponton een ringvormig ponton lichaam heeft met een bodem (3a), een buitenste omtrekswand (3b), en een binnenste omtrekswand (3c) die een oogopening (4) van het ring ponton vormt; - meerdere kolommen 5 die zich naar boven uitstrekken vanaf het ring ponton (3) en daarop de deckbox constructie (2) steunen; 10 - een water ballast systeem omvattende ballastanks (7,8) die het mogelijk maken het vaartuig te belasten; - waarbij de deckboxconstructie (2) is voorzien van een moonpool voor boorwerkzaamheden 15 (10); - waarbij het vaartuig een boorinstallatie omvat met een boortoren (11) om boorwerkzaamheden uit te voeren langs één of meerdere werklijnen (12) door de moonpool voor boorwerkzaamheden (10) en de oogopening (4) van het ring ponton, 20 met het kenmerk, dat het vaartuig is voorzien van tenminste één ROV systeem, welk ROV systeem omvat: - een op afstand bedienbaar voertuig voor onderwater (ROV) (15), 25. een speciale ROV moonpoolschacht (20,22), die zich van een bodemeinde-opening (21) van de moonpoolschacht naar boven uitstrekt naar een boven de waterlijn gelegen ROV onderhoudsgarage (25), - een ROV systeem winch (30), 30 en dat de ROV moonpoolschacht (20,22) is voorzien van een zijopening (23) die in de binnenste omtrekswand (3c) van het ring ponton (3) ligt, zodat de ROV kan worden uitgebracht en teruggenomen via de zijopening (23), bijvoorbeeld in het geval dat de bodemeinde-opening is afgesloten omdat het vaartuig met de bodem (3a) van het ring ponton (3) op de zeebodem zit voor boorwerkzaamheden in ondiep arctisch water. 35A semi-submersible drilling vessel for arctic waters, which vessel comprises: - a deckbox structure (2); 5. a ring pontoon (3), which ring pontoon has an annular pontoon body with a bottom (3a), an outer peripheral wall (3b), and an inner peripheral wall (3c) that forms an eye opening (4) of the ring pontoon; - a plurality of columns 5 extending upwards from the ring pontoon (3) and supporting the deckbox structure (2) thereon; - a water ballast system comprising ballast tanks (7,8) that make it possible to load the vessel; - wherein the deckbox construction (2) is provided with a moonpool for drilling operations 15 (10); - wherein the vessel comprises a drilling rig with a derrick (11) for carrying out drilling operations along one or more working lines (12) through the moonpool for drilling operations (10) and the eye opening (4) of the ring pontoon, characterized in, that the vessel is provided with at least one ROV system, which ROV system comprises: - a remote-controlled underwater vehicle (ROV) (15), 25. a special ROV moonpool shaft (20,22), which is located at a bottom end opening (21) extends upward from the moonpool shaft to an ROV maintenance garage (25) located above the waterline, - an ROV system winch (30), 30 and that the ROV moonpool shaft (20,22) is provided with a side opening (23) which lies in the inner circumferential wall (3c) of the pontoon ring (3), so that the ROV can be released and taken back via the side opening (23), for example in the case that the bottom end opening is closed because the vessel is bottomed (3a) ) of the ring pontoon (3) on the seabed drilling work in shallow arctic water. 35 2. Vaartuig volgens conclusie 1, waarbij de moonpoolschacht een verticaal schacht gedeelte (20) heeft dat zich vanaf de bodemeinde-opening naar boven uitstrekt en waarbij -7- een zijwaarts schacht gedeelte (22) aansluit op het verticale schacht gedeelte en zich zijwaarts naar binnen uitstrekt naar de zijopening (23).The vessel of claim 1, wherein the moonpool shaft has a vertical shaft portion (20) extending upwardly from the bottom end opening and wherein a lateral shaft portion (22) connects to the vertical shaft portion and extends sideways to extends inside to the side opening (23). 3. Vaartuig volgens conclusie 1 of 2, waarbij de moonpoolschacht (20) zich naar boven 5 uitstrekt door het ring ponton, en bij voorkeur naar boven door een kolom (5), waarbij de onderhoudsgarage (25) in de deckboxconstructie (2) is gelegen.Vessel according to claim 1 or 2, wherein the moonpool shaft (20) extends upwards through the ring pontoon, and preferably upwards through a column (5), wherein the maintenance garage (25) is in the deckbox structure (2) located. 4. Vaartuig volgens één of meer van de conclusies 1-3, waarbij het ROV systeem een kooi (26) omvat met een verbindingskabelmanagementinrichting omvattende een 10 verbindingskabel (27), en waarbij de ROV (15) via de verbindingskabel is verbonden met de kooi (26), waarbij de kooi is ingericht om de ROV op te nemen.4. Vessel according to one or more of claims 1-3, wherein the ROV system comprises a cage (26) with a connection cable management device comprising a connection cable (27), and wherein the ROV (15) is connected to the cage via the connection cable (26), wherein the cage is adapted to receive the ROV. 5. Vaartuig volgens conclusie 4, waarbij de kooi (26) een kooi met zijdelingse toegang is met een parkeerruimte met zijdelingse toegang voor de ROV (15), waarbij het systeem de 15 parkeerruimte met zijdelingse toegang uitlijnt met de zijopening (23) van de moonpoolschacht voor het uitbrengen en terugnemen van de ROV via de zijopening.5. Vessel according to claim 4, wherein the cage (26) is a cage with lateral access with a parking space with lateral access for the ROV (15), wherein the system aligns the parking space with lateral access with the side opening (23) of the moonpool shaft for releasing and taking back the ROV via the side opening. 6. Vaartuig volgens conclusie 4 of 5, waarbij het ROV systeem een cursorinrichting (28) omvat die in de moonpoolschacht (20) verplaatst langs één of meer verticale geleiderails (29) 20 voor de cursorinrichting, waarbij de cursorinrichting (28) en de kooi (26) zijn ingericht om op elkaar te passen zodat de cursorinrichting de kooi in de moonpoolschacht positioneert, bij voorkeur ten minste wanneer de water- luchtgrens in de moonpoolschacht wordt gepasseerd.Vessel according to claim 4 or 5, wherein the ROV system comprises a cursor device (28) that moves in the moonpool shaft (20) along one or more vertical guide rails (29) for the cursor device, the cursor device (28) and the cage (26) are adapted to match each other so that the cursor device positions the cage in the moonpool shaft, preferably at least when the water-air boundary is passed through the moonpool shaft. 7. Vaartuig volgens één of meer van de conclusies 1-6, waarbij de onderhoudsgarage 25 (25) één of meer mobiele luiken (23) omvat die over de moonpoolschacht (20) onder de volledig teruggenomen ROV (15) beweegbaar zijn.7. Vessel according to one or more of claims 1-6, wherein the maintenance garage 25 (25) comprises one or more mobile hatches (23) that are movable over the moonpool shaft (20) under the fully retracted ROV (15). 8. Vaartuig volgens één of meer van de conclusies 1-7, waarbij het vaartuig (1) twee ROV systemen met zijopeningen (23) op diametraal tegenover elkaar gelegen posities in het 30 ring ponton (3) omvat.8. Vessel according to one or more of claims 1-7, wherein the vessel (1) comprises two ROV systems with side openings (23) at diametrically opposite positions in the ring pontoon (3). 9. Werkwijze voor het uitvoeren van door een ROV ondersteunde onderzeese werkzaamheden met een half afzinkbaar boorvaartuig (1) voor arctische wateren volgens één of meer van de voorgaande conclusies, waarbij de ROV (15) wordt uitgebracht en 35 teruggenomen via de zijopening (23) van de moonpoolschacht.9. Method for performing subsea operations supported by an ROV with a semi-submersible drilling vessel (1) for arctic waters according to one or more of the preceding claims, wherein the ROV (15) is released and taken back via the side opening (23) from the moonpool shaft. 10. Werkwijze volgens conclusie 9, waarbij de werkwijze wordt uitgevoerd in ondiep water, en waarbij het vaartuig zodanig is geballast dat het met bodem (3a) van het ring -8- ponton (3) op de zeebodem (9) zit zodat de bodemeinde-opening van de moonpoolschacht door de zeebodem is afgesloten, en waarbij de ROV (15) wordt uitgebracht en teruggenomen via de zijopening (23) van de moonpoolschacht om ROV ondersteunde onderzeese werkzaamheden uit te voeren.A method according to claim 9, wherein the method is carried out in shallow water, and wherein the vessel is ballasted such that it sits with bottom (3a) of the ring pontoon (3) on the seabed (9) so that the bottom end - aperture of the moonpool shaft is closed off by the seabed, and the ROV (15) is released and taken back via the moonpool shaft side aperture (23) to perform ROV supported submarine work.
NL2009676A 2012-10-22 2012-10-22 Semi-submersible arctic waters drilling vessel and method. NL2009676C2 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
NL2009676A NL2009676C2 (en) 2012-10-22 2012-10-22 Semi-submersible arctic waters drilling vessel and method.
PCT/NL2013/050731 WO2014065654A1 (en) 2012-10-22 2013-10-15 Semi-submersible arctic waters drilling vessel and method

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL2009676A NL2009676C2 (en) 2012-10-22 2012-10-22 Semi-submersible arctic waters drilling vessel and method.
NL2009676 2012-10-22

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* Cited by examiner, † Cited by third party
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CN106872211B (en) * 2017-03-31 2023-12-15 派格水下技术(广州)有限公司 Coring system based on remote control submersible
US10450038B2 (en) * 2017-06-27 2019-10-22 Jurong Shipyard Pte Ltd Continuous vertical tubular handling and hoisting buoyant structure

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2110602A (en) * 1981-09-12 1983-06-22 Vo Offshore Limited Semi-submersible drilling vessel
WO1999029566A1 (en) * 1997-12-11 1999-06-17 Ormen Brede A/S Floating installation
EP2093143B1 (en) * 2008-02-19 2011-04-27 Wärtsilä Ship Design Germany GmbH Service vessel

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2110602A (en) * 1981-09-12 1983-06-22 Vo Offshore Limited Semi-submersible drilling vessel
WO1999029566A1 (en) * 1997-12-11 1999-06-17 Ormen Brede A/S Floating installation
EP2093143B1 (en) * 2008-02-19 2011-04-27 Wärtsilä Ship Design Germany GmbH Service vessel

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