US3872814A - Twin-hull ship for drilling in ice-covered waters - Google Patents

Twin-hull ship for drilling in ice-covered waters Download PDF

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Publication number
US3872814A
US3872814A US400218A US40021873A US3872814A US 3872814 A US3872814 A US 3872814A US 400218 A US400218 A US 400218A US 40021873 A US40021873 A US 40021873A US 3872814 A US3872814 A US 3872814A
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United States
Prior art keywords
vessel
hull
waterline
hulls
ice
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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
US400218A
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English (en)
Inventor
Joaquin R Rodriguez
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.)
Global Marine Inc
Original Assignee
Global Marine Inc
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Filing date
Publication date
Application filed by Global Marine Inc filed Critical Global Marine Inc
Priority to US400218A priority Critical patent/US3872814A/en
Priority to CA207,671A priority patent/CA1004550A/en
Priority to NO743411A priority patent/NO743411L/no
Application granted granted Critical
Publication of US3872814A publication Critical patent/US3872814A/en
Assigned to CHEMICAL BANK, A NY CORP. reassignment CHEMICAL BANK, A NY CORP. SECURITY INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: GLOBAL MARINE INC.
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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 
    • 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 
    • 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
    • B63B1/10—Hydrodynamic or hydrostatic features of hulls or of hydrofoils deriving lift mainly from water displacement with multiple hulls
    • B63B1/107—Semi-submersibles; Small waterline area multiple hull vessels and the like, e.g. SWATH
    • 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
    • B63B35/10—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 having forced pitching or rolling equipment
    • 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
    • B63B1/10—Hydrodynamic or hydrostatic features of hulls or of hydrofoils deriving lift mainly from water displacement with multiple hulls
    • B63B1/12—Hydrodynamic or hydrostatic features of hulls or of hydrofoils deriving lift mainly from water displacement with multiple hulls the hulls being interconnected rigidly
    • B63B1/121—Hydrodynamic or hydrostatic features of hulls or of hydrofoils deriving lift mainly from water displacement with multiple hulls the hulls being interconnected rigidly comprising two hulls
    • B63B2001/123—Hydrodynamic or hydrostatic features of hulls or of hydrofoils deriving lift mainly from water displacement with multiple hulls the hulls being interconnected rigidly comprising two hulls interconnected by a plurality of beams, or the like members only
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B2211/00—Applications
    • B63B2211/06—Operation in ice-infested waters

Definitions

  • ABSTRACT A drilling ship having twin hulls bridged by a deck operated as a drilling platform.
  • the twin hulls have a deep-draft narrow beam configuration with a small waterplane area.
  • Each hull extends outwardly fore and aft at the waterline and has appendages along the sides to provide icebreaking capability in all directions.
  • Rolling and/or pitching motion is induced by pumping of air in and out of ballast tanks to induce the motion at or near the natural roll and pitch frequency of the vessel.
  • the natural frequency for a single-hull vessel of the type described in the above-identified application has a pitch period in the order of 7 seconds. Since the induced pitching is at or near the natural pitch frequency of the vessel, the pneumatic system must function at the rate of approximately 8 cycles per minute. It is desirable to reduce this frequency in order'to reduce the rate at which the inducing system must cycle. lt-is also desirable to reduce this frequency to improve the comfort of the crew who are exposed to this continuous pitching motion.
  • the present invention is directed to a vessel which provides improved operating characteristics, both in the transit mode and. in the drilling mode, when operating in icy waters.
  • the design of the vessel is such that it provides a high natural period in both roll and pitch, the pitch and roll frequencies being substantially equal.
  • the cycle period is of the order of 30 seconds or higher, four times the pitch period of a shipshape vessel.
  • the vessel design has the further advantage that it has icebreaking capability regardless of the direction of approach of the ice. Hence shift in the direction of ice flow during operation inthe drilling mode, for example, does not necessitate any change in the mooring system to adjust the heading of the vessel.
  • a further advantage of the present invention is that the vessel exhibits a high radius of gyration and a low water plane of inertia under normal load conditions.
  • the vessel exhibits a much lower moment to trim thana conventional shipshape vessel, thus. allowing much smaller exciting forces to start and maintain the induced pitching action.
  • the vessel design according to the present invention has the advantage that the vessel presents a very deep draft, permitting all propellers, thrusters, and mooring equipment to be located deep beneath the surface of the water and well below the ice, thus reducing the problem of damage to these functions by ice movement.
  • a vessel having a twin-hull construction in which the hulls are designed with a deep draft and low water plane area, and with a high radius of gyration. The moment to trim 1 inch is much lower than in conventional vessels.
  • Eachhull, with its deep draft, is designed to extend well below and clear of any surrounding ice.
  • the propulsion system isat the bottom of each hull as are the mooring lines where they engage the vessel, thus keeping the mooring and propulsion functions below any surrounding ice. Chambers are provided at the bottom of each hull, fore and aft.
  • FIG. 1 is a side elevational view of the vessel according to the present invention
  • FIG. 2 is an end view of the vessel
  • FIG. 3 is a partial sectional view taken substantially on line 3-3 of FIG. 2.
  • the icebreaking vessel herein described is a modification of the drilling vessel described in copending application Ser..No. 183,466, filed Sept. 24, 1971, by the same inventors as the present invention.
  • the numeral 10 indicates generally an icebreaking drillingvessel which includes a pair of vertical hulls l2 and 14 connected at their upper end by a bridging structure forming a platform 16.
  • the platform 16 provides; a main deck 18 and a lower deck 20.
  • the vertical hulls l2 and. 14 are secured to the platform 16, the assembly of the vertical hulls l2 and 14 on the bridging platform 16 being structurally reinforced and joined together in a unitary rigid structure by means of suitable tubular reinforcing members 22 extending between the hulls l2 and 14 above the waterline. Additional vertical and diagonal bracing members 24 provide added rigidity to the platform 16.
  • the hulls 12 and 14 are also joined below the waterline by a pair of horizontal cross members 26.
  • a drilling derrick 28 mounted on the top deck 18 : a drilling derrick 28 and related equipment necessary to carry on sub-sea drilling operations.
  • a riser or drill pipe (not shown) ex tending from the'drilling rig 28 down to a well being drilled passes through a casing 30 which passes through the platform 16 and extends downwardly a distance below the waterline.
  • the casing 30 is surrounded by an secured to the shroud at a point well above the waterline so as to be clear of any chunks of ice which might be encountered.
  • each hull is in the form of a cylindrical torpedo-shaped portion 40 having a semispherical bow 42 and a conically tapered stern 44 terminating in a propeller 46 surrounded by a suitable protective shroud 48.
  • Each hull further includes a pair of substantially parallel flat sides 50 and 52 extending between the bottom of the platform 16 and the top of the torpedo-shaped portion 40. The spacing between the sides 50 and 52 is preferably lessthan the diameter of the torpedo-shaped portion 40.
  • the sides 50 and 52 terminate fore and aft in converging surfaces 54 and 56 which join in a vertically extending edge or prow 58.
  • the edge 58 extends vertically from the top of the torpedo-shaped hull portion 40 to a point sufficiently below the waterline to be below the water-ice interface. From this point, the prow angles outwardly at a sharp angle to the horizontal, as indicated at 60 to form an icebreaking prow at both the bow and stem edges of the hull.
  • the hulls 12 and 14 are constructed in conventional manner by providing a plurality of vertical bulkheads 62 to which are welded or otherwise secured steel plates forming the sides, bow, and stern sections of the hulls.
  • each hull is provided with a pair of icebreaking appendages 64 and 66 which extend longitudinally along the respective sides 50 and 52 of each hull and centered approximately along the waterline.
  • the appendages are formed so as to form a triangle with the side walls 50 and 52 and are tapered at either end.
  • the void spaces within the icebreaking appendages 64 and 66 are left open to the sea by suitable openings so that the addition of the appendages has negligible effect on the buoyancy characteristics of the vessel.
  • icebreaking capabilities of the vessel are enhanced by incorporating a roll and pitch inducing systern of the type described in detail in the aboveidentified copending application Ser. No. 183,466.
  • fore and aft chambers 70 and 72 are provided in each of the hulls 12 and 14 that are opened to the sea. Flooding of each of these chambers is controlled by an air duct 74 and 76 respectively, which extend to the upper deck 18.
  • Each of the air ducts is connected either to atmosphere or to a blower 78 through an air diverting mechanism 80 which permits air to be either forced under pressure from the blower down the duct into the associated chamber, or permits the air to be forced out of the chamber back into the atmosphere under the pressure exerted by the water.
  • the level of water within the chambers can be rapidly raised or lowered to change the buoyancy effect of the chamber on the vessel.
  • the bow of the vessel can be lifted and the stern lowered.
  • a pitching motion of the vessel can be induced in the manner described in detail in the above-identified application.
  • a rolling action can be induced.
  • any combination of a rolling and pitching motion can be induced.
  • mooring lines After the vessel moves into location over a drilling site it may be moored by an arrangement of preferably eight mooring lines. These mooring lines, two of which are indicated in FIG. 1 at 82, extend outwardly from the vessel below the water level to chains 84 and anchors 86. The lines 82 enter the vessel through the torpedo-shaped portion 40 of the two hulls through fairleads 88. The fairleads are connected to hause pipes .90 which extend up to the lower deck 20. The line 82 after passing through the hause pipe is attached to a mooring winch 92. With eight mooring lines, there are two hause pipes both fore and aft of each of the hulls, as seen in the sectional view of FIG.
  • the subsurface fairleads 88 which guide the mooring lines 82 out of the hause pipes are preferably constructed in the manner taught in more detail in copending application Ser. No. 183,466, Filed Sept. 24, 1971, and assigned to the same assignee as the present invention.
  • the vessel is designed to provide a high natural period in both roll and pitch, for example, of the order of 30 seconds or higher, as compared with the natural pitch period of a conventional vessel of about 7 seconds. This is accomplished by designing the vessel with a high radius of gyration and relatively small waterplane area.
  • the hulls at full load draft have a beam width which is quite small compared to the length of the hulls and draft at full load waterline. This enables the pitch and roll inducing system-to operate at a much lower frequency, i.e., approximately one-fourth the frequency as required in a conventional icebreaking vessel. This lower frequency also means that the living conditions aboard the vessel are much more tolerable to the crew.
  • a further advantage of the present invention is that the vessel design with its high radius of gyration and low waterplane area provides that the moment required to trim or heel the vessel by one inch is much lower than in a conventional icebreaking ship-shape vessel.
  • Ballast tanks can easily be arranged to provide good draft, heel, and trim control. This provides greater stability control for relocating heavy weights on the vessel during drilling operations. Because propellers are located deep under water as are the mooring lines, there is practically no likelihood of damage from ice particles and other objects floating on the surface of the water. Likewise fuel oil can be stored in tanks deep under the water in the torpedo-shaped hull sections reducing the chance of rupture and oil spillage by ice damage. The very narrow hull beam at the waterline permits bow and stem of each hull to be designed with a very sharp angular edge, giving the ship greatly reduced icebreaking resistance as the vessel oscillates.
  • the vessel according to the design of the present invention may be operated in the transit mode either in open water or where danger of floating ice exists. It permits operation of the vessel on location in the drilling mode, not only in normal open waters, but in open waters where moving ice sheets may occur.
  • An icebreaking vessel for providing a mobile drilling platform capable of operating in arctic waters, comprising: a pair of spaced parallel hulls, deck means interconnecting the hulls above the waterplane when the vessel is floating, the vessel having a high radius of gyration and a small waterplane area, each hull having a very narrow beam in relation to the length and draft, the bow and stern of each hull having a wedge-shaped portion forming an icebreaking edge extending at a substantial angle from the vertical from a point substantially below to a point substantially above the waterline, icebreaking sponsons extending along the sides of each of the hulls at the waterline from the bow to stem, each sponson having a lower surface extending below the waterline and projecting outwardly and upwardly from the side of the hull at an acute angle'so as to ride up on and depress the ice along the full extent of the sides of the hulls with rolling motion of the vessel.
  • each hull including chambers opening downwardly through the bottom of the hull adjacent the bow and the stern, and means pumping air alternately into and out of each chamber at a frequency to induce pitching or rolling at or near the said natural period of the vessel.
  • Apparatus of claim 2 further including a plurality of mooring lines extending from winches in the vessel through openings in the lower hull portions.
  • Apparatus of claim 2 further including a drilling rig mounted on the top of the deck means, the deck means having an opening to the water below the drilling rig, a protective shroud extending around said opening from the deck means to below the waterline, the shroud being elongated and terminating in a wedge-shaped edge fore and aft, the edges extending at an acute angle to the waterplane.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Ocean & Marine Engineering (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Earth Drilling (AREA)
US400218A 1973-09-24 1973-09-24 Twin-hull ship for drilling in ice-covered waters Expired - Lifetime US3872814A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
US400218A US3872814A (en) 1973-09-24 1973-09-24 Twin-hull ship for drilling in ice-covered waters
CA207,671A CA1004550A (en) 1973-09-24 1974-08-23 Twin-hull ship for drilling in ice-covered waters
NO743411A NO743411L (fi) 1973-09-24 1974-09-23

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Cited By (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3924415A (en) * 1974-12-30 1975-12-09 Santa Fe Int Corp Column stabilized semisubmersible pipelaying barge
US3987640A (en) * 1974-12-30 1976-10-26 Santa Fe International Corporation Column stabilized semisubmersible pipelaying barge
US4075964A (en) * 1975-08-29 1978-02-28 Global Marine, Inc. Ice melting system
US4260292A (en) * 1979-10-25 1981-04-07 The Offshore Company Arctic offshore platform
US4369725A (en) * 1978-06-30 1983-01-25 Mitsui Engineering & Shipbuilding Co., Ltd. Method and means for increasing the maneuverability of a ship in ice-covered waters
FR2528380A1 (fr) * 1982-06-15 1983-12-16 Waertsilae Oy Ab Procede pour l'application d'une plate-forme de forage flottante et plate-forme de forage pour l'application dudit procede
WO1985003050A1 (en) * 1983-12-30 1985-07-18 William Bennet Semi-submersible vessel
GB2169859A (en) * 1984-12-03 1986-07-23 Brown & Root Semi-submersible lifting vessels
US20100224114A1 (en) * 2006-02-27 2010-09-09 Heerema Marine Contractors Nederland B.V. Semi-Submersible Vessel, Method For Operating A Semi-Submersible Vessel And Method For Manufacturing A Semi-Submersible Vessel
WO2010102642A1 (de) 2009-03-10 2010-09-16 Wärtsilä Ship Design Germany GmbH Eisbrechendes system für schwimmkörper
US20110174206A1 (en) * 2010-01-19 2011-07-21 Kupersmith John A Wave attenuating large ocean platform
US20110239923A1 (en) * 2010-03-31 2011-10-06 Niels Peter Elmbo Icebreaking vessel
WO2011120527A3 (en) * 2010-03-31 2011-11-17 Maersk Supply Service A/S Icebreaking vessel and method of breaking ice
WO2011120528A3 (en) * 2010-03-31 2011-11-24 Maersk Supply Service A/S Icebreaking vessel and method of breaking ice
US20120291684A1 (en) * 2011-05-19 2012-11-22 Gavin Humphreys Ice Breaking Drilling Vessel With Stowable Mast
US20130074753A1 (en) * 2010-03-31 2013-03-28 Maersk Supply Service A/S Icebreaking vessel and method of breaking ice
KR20130081643A (ko) * 2010-03-31 2013-07-17 메르스크 서플라이 서비스 에이/에스 쇄빙선 및 쇄빙 방법
US8568063B2 (en) 2009-04-30 2013-10-29 Exxonmobil Upstream Research Company Mooring system for floating arctic vessel
RU2529098C2 (ru) * 2012-12-10 2014-09-27 Евгений Михайлович Герасимов Полупогружная буровая платформа катамаранного типа
USD741778S1 (en) * 2013-04-12 2015-10-27 Fincantieri S.P.A. Fore part of a drilling ship
USD751970S1 (en) * 2014-04-24 2016-03-22 Fincantieri S.P.A. Drillship
WO2021023528A1 (en) * 2019-08-02 2021-02-11 Itrec B.V. Semi-submersible floating offshore vessel
US11377178B2 (en) * 2019-04-02 2022-07-05 National Taiwan Ocean University Wave sheltering monohull vessel

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3279407A (en) * 1963-05-28 1966-10-18 Stenger Jacob Johannes Surface vessel
US3636904A (en) * 1969-01-17 1972-01-25 Grenobloise Etude Appl Icebreaker equipment for ships
US3672175A (en) * 1970-10-02 1972-06-27 Sun Oil Co Ice cutter
US3689953A (en) * 1971-03-19 1972-09-12 Costas E Markakis Stabilized floating structure
US3693360A (en) * 1970-10-02 1972-09-26 John E Holder Ice breaker for marine structures
US3766874A (en) * 1971-07-29 1973-10-23 Gen Dynamics Corp Moored barge for arctic offshore oil drilling

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3279407A (en) * 1963-05-28 1966-10-18 Stenger Jacob Johannes Surface vessel
US3636904A (en) * 1969-01-17 1972-01-25 Grenobloise Etude Appl Icebreaker equipment for ships
US3672175A (en) * 1970-10-02 1972-06-27 Sun Oil Co Ice cutter
US3693360A (en) * 1970-10-02 1972-09-26 John E Holder Ice breaker for marine structures
US3689953A (en) * 1971-03-19 1972-09-12 Costas E Markakis Stabilized floating structure
US3766874A (en) * 1971-07-29 1973-10-23 Gen Dynamics Corp Moored barge for arctic offshore oil drilling

Cited By (41)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3987640A (en) * 1974-12-30 1976-10-26 Santa Fe International Corporation Column stabilized semisubmersible pipelaying barge
US3924415A (en) * 1974-12-30 1975-12-09 Santa Fe Int Corp Column stabilized semisubmersible pipelaying barge
US4075964A (en) * 1975-08-29 1978-02-28 Global Marine, Inc. Ice melting system
US4117794A (en) * 1975-08-29 1978-10-03 Global Marine, Inc. Ice melting system and method
US4369725A (en) * 1978-06-30 1983-01-25 Mitsui Engineering & Shipbuilding Co., Ltd. Method and means for increasing the maneuverability of a ship in ice-covered waters
US4260292A (en) * 1979-10-25 1981-04-07 The Offshore Company Arctic offshore platform
US4716972A (en) * 1982-06-15 1988-01-05 Oy Wartsila Ab Floating drilling platform
FR2528380A1 (fr) * 1982-06-15 1983-12-16 Waertsilae Oy Ab Procede pour l'application d'une plate-forme de forage flottante et plate-forme de forage pour l'application dudit procede
WO1985003050A1 (en) * 1983-12-30 1985-07-18 William Bennet Semi-submersible vessel
US4646672A (en) * 1983-12-30 1987-03-03 William Bennett Semi-subersible vessel
GB2169859A (en) * 1984-12-03 1986-07-23 Brown & Root Semi-submersible lifting vessels
US20100224114A1 (en) * 2006-02-27 2010-09-09 Heerema Marine Contractors Nederland B.V. Semi-Submersible Vessel, Method For Operating A Semi-Submersible Vessel And Method For Manufacturing A Semi-Submersible Vessel
US8752496B2 (en) * 2006-02-27 2014-06-17 Heerema Marine Contractors Nederland Se Semi-submersible vessel, method for operating a semi-submersible vessel and method for manufacturing a semi-submersible vessel
WO2010102642A1 (de) 2009-03-10 2010-09-16 Wärtsilä Ship Design Germany GmbH Eisbrechendes system für schwimmkörper
RU2483967C2 (ru) * 2009-03-10 2013-06-10 ВЭРТСИЛЭ ШИП ДИЗАЙН ДЖЁМАНИ ГмбХ Ледокольная система для плавающих тел
US9233739B2 (en) 2009-04-30 2016-01-12 Exxonmobil Upstream Research Company Mooring system for floating arctic vessel
US8568063B2 (en) 2009-04-30 2013-10-29 Exxonmobil Upstream Research Company Mooring system for floating arctic vessel
US20110174206A1 (en) * 2010-01-19 2011-07-21 Kupersmith John A Wave attenuating large ocean platform
US20130087088A1 (en) * 2010-03-31 2013-04-11 Maersk Supply Service A/S Icebreaking vessel and method of breaking ice
US9255374B2 (en) * 2010-03-31 2016-02-09 Maersk Supply Service A/S Icebreaking vessel and method of breaking ice
KR20130010481A (ko) * 2010-03-31 2013-01-28 메르스크 서플라이 서비스 에이/에스 쇄빙선 및 쇄빙 방법
KR101687857B1 (ko) * 2010-03-31 2016-12-28 메르스크 서플라이 서비스 에이/에스 쇄빙선 및 쇄빙 방법
KR20130081643A (ko) * 2010-03-31 2013-07-17 메르스크 서플라이 서비스 에이/에스 쇄빙선 및 쇄빙 방법
WO2011120528A3 (en) * 2010-03-31 2011-11-24 Maersk Supply Service A/S Icebreaking vessel and method of breaking ice
WO2011120527A3 (en) * 2010-03-31 2011-11-17 Maersk Supply Service A/S Icebreaking vessel and method of breaking ice
KR101687858B1 (ko) * 2010-03-31 2016-12-19 메르스크 서플라이 서비스 에이/에스 쇄빙선 및 쇄빙 방법
US20130074753A1 (en) * 2010-03-31 2013-03-28 Maersk Supply Service A/S Icebreaking vessel and method of breaking ice
US9056658B2 (en) * 2010-03-31 2015-06-16 Maersk Supply Service A/S Icebreaking vessel
US9242705B2 (en) * 2010-03-31 2016-01-26 Maersk Supply Service A/S Icebreaking vessel and method of breaking ice
US20110239923A1 (en) * 2010-03-31 2011-10-06 Niels Peter Elmbo Icebreaking vessel
EA022074B1 (ru) * 2010-03-31 2015-10-30 Мерск Сепплай Сервис А/С Ледокольное судно
EA022073B1 (ru) * 2010-03-31 2015-10-30 Мерск Сепплай Сервис А/С Ледокольное судно
US9067649B2 (en) * 2011-05-19 2015-06-30 Stena Drilling Ltd. Ice breaking drilling vessel with stowable mast
US20140209004A1 (en) * 2011-05-19 2014-07-31 Stena Drilling Ltd. Ice Breaking Drilling Vessel With Stowable Mast
US20120291684A1 (en) * 2011-05-19 2012-11-22 Gavin Humphreys Ice Breaking Drilling Vessel With Stowable Mast
RU2529098C2 (ru) * 2012-12-10 2014-09-27 Евгений Михайлович Герасимов Полупогружная буровая платформа катамаранного типа
USD741778S1 (en) * 2013-04-12 2015-10-27 Fincantieri S.P.A. Fore part of a drilling ship
USD751970S1 (en) * 2014-04-24 2016-03-22 Fincantieri S.P.A. Drillship
US11377178B2 (en) * 2019-04-02 2022-07-05 National Taiwan Ocean University Wave sheltering monohull vessel
WO2021023528A1 (en) * 2019-08-02 2021-02-11 Itrec B.V. Semi-submersible floating offshore vessel
NL2023601B1 (en) * 2019-08-02 2021-02-23 Itrec Bv Semi-submersible floating offshore vessel

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CA1004550A (en) 1977-02-01
NO743411L (fi) 1975-04-21

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