WO2021078748A1 - Procédé de fonctionnement d'un navire et d'une éolienne flottante et combinaison d'un navire et d'une éolienne flottante - Google Patents

Procédé de fonctionnement d'un navire et d'une éolienne flottante et combinaison d'un navire et d'une éolienne flottante Download PDF

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Publication number
WO2021078748A1
WO2021078748A1 PCT/EP2020/079515 EP2020079515W WO2021078748A1 WO 2021078748 A1 WO2021078748 A1 WO 2021078748A1 EP 2020079515 W EP2020079515 W EP 2020079515W WO 2021078748 A1 WO2021078748 A1 WO 2021078748A1
Authority
WO
WIPO (PCT)
Prior art keywords
vessel
anchors
wind turbine
floating wind
floating
Prior art date
Application number
PCT/EP2020/079515
Other languages
English (en)
Inventor
Diederick Bernardus Wijning
David ROODENBURG
Original Assignee
Itrec B.V.
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 B.V. filed Critical Itrec B.V.
Priority to NO20220588A priority Critical patent/NO20220588A1/en
Publication of WO2021078748A1 publication Critical patent/WO2021078748A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B21/00—Tying-up; Shifting, towing, or pushing equipment; Anchoring
    • B63B21/50—Anchoring arrangements or methods for special vessels, e.g. for floating drilling platforms or dredgers
    • 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
    • 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
    • B63B2035/4433—Floating structures carrying electric power plants
    • B63B2035/446—Floating structures carrying electric power plants for converting wind energy into electric energy
    • 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
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/70—Wind energy
    • Y02E10/727—Offshore wind turbines

Definitions

  • the invention relates to a vessel, e.g. a vessel for performing subsea wellbore related activities, such as workover activities, well maintenance, installing an object on a subsea wellbore, drilling a subsea wellbore, oil production via the wellbore, etc.
  • a vessel e.g. a vessel for performing subsea wellbore related activities, such as workover activities, well maintenance, installing an object on a subsea wellbore, drilling a subsea wellbore, oil production via the wellbore, etc.
  • the vessel During performing of the subsea wellbore related activities, the vessel preferably maintains its position. Depending on the depth of the sea at the wellbore, maintaining the position can be done in various ways including but not limited to active positioning of the vessel using the vessel engines, jack-up systems and anchoring systems.
  • a drawback is that an oil field generally comprises a lot of distinct wellbores so that the position of the vessel regularly changes within the oil field. For jack-up systems and anchoring systems this requires a lot of time to adjust the position while the active positioning systems require a large energy consumption.
  • An anchoring system has the additional drawback that a lot of wellbores require a lot of anchors to be placed on the sea bottom having a negative influence on sea life and requiring a lot of installation time.
  • Another issue related to performing subsea wellbore related activities is that the activities require a lot of energy. Normally this energy is provided by the vessel itself for instance provided by generators using fuel stored on board of the vessel. However, when fuel runs low, new fuel needs to be transported to the vessel. Other solutions may include the provision of power lines between an onshore or offshore wind turbine farm. However, such long power lines are also not desired, especially when the position regularly changes.
  • This object is achieved by providing a method for operating a vessel for offshore operations and a floating wind turbine for providing power from the wind to the vessel, wherein the method comprises the following steps: a. sailing the vessel and floating wind turbine to an offshore site where operations need to be carried out by the vessel; b. providing a plurality of anchors in a sea bottom; c. mooring the vessel to the plurality of anchors; and d. mooring the floating wind turbine to the plurality of anchors such that the vessel and the floating wind turbine share at least one of the plurality of anchors.
  • a floating wind turbine provides a power source near the vessel so that the vessel is able to operate independently for a longer period of time, which floating wind turbine is able to follow any position change of the vessel easily.
  • the number of anchors to be used can be reduced which results in a reduction of installation time, It also allows to handle the corresponding two mooring lines between the shared anchor and the vessel and floating wind turbine more efficiently.
  • the vessel is a vessel for performing wellbore-related activities, such as workover activities, well maintenance, installing an object on a subsea wellbore, drilling a subsea wellbore, oil production via the wellbore, etc.
  • wellbore-related activities such as workover activities, well maintenance, installing an object on a subsea wellbore, drilling a subsea wellbore, oil production via the wellbore, etc.
  • the vessel is a semisubmersible vessel.
  • the floating wind turbine and the vessel share at least two of the plurality of anchors.
  • the floating wind turbine is preferably moored to at least three anchors so that the position can efficiently be maintained in all directions.
  • the vessel is preferably moored to at least three, more preferably at least four, most preferably at least six, for instance eight anchors.
  • the floating wind turbine is a first floating wind turbine, wherein a second floating wind turbine is provided that is moored to the plurality of anchors such that the vessel and the second floating wind turbine share at least one of the plurality of anchors.
  • providing a plurality of anchors in a sea bottom includes providing a first set of anchors and a second set of anchors, wherein the offshore site is a first offshore site, wherein in step c. and d. the floating wind turbine and the vessel are moored to the first set of anchors, and wherein the method further comprises the steps of: e. sailing the vessel to a second offshore site; and f. mooring the vessel to the second set of anchors and one or more anchors of the first set of anchors.
  • step f. the vessel and the floating wind turbine are moored to the second set of anchors and one or more anchors of the first set of anchors, wherein the vessel and the floating wind turbine share at least one anchor.
  • the floating wind turbine is a first floating wind turbine, and wherein a second floating wind turbine is moored to the second set of anchors, wherein the vessel after step f. shares at least one anchor with the second floating wind turbine.
  • the first floating wind turbine, the second floating wind turbine, and the vessel all share an anchor after step d. and/or after step f.
  • the invention further relates to in combination a vessel for offshore operations and a floating wind turbine for providing power from the wind to the vessel including a plurality of anchors, wherein the vessel and the floating wind turbine are moored to the plurality of anchors such that the vessel and the floating wind turbine share at least one of the plurality of anchors.
  • the vessel is a vessel for performing wellbore-related activities, such as workover activities, well maintenance, installing an object on a subsea wellbore, drilling a subsea wellbore, oil production via the wellbore, etc.
  • wellbore-related activities such as workover activities, well maintenance, installing an object on a subsea wellbore, drilling a subsea wellbore, oil production via the wellbore, etc.
  • the vessel is a semisubmersible vessel.
  • the floating wind turbine and the vessel share at least two of the plurality of anchors.
  • the floating wind turbine is a first floating wind turbine
  • the second floating wind turbine is moored to the plurality of anchors such that the vessel and the second floating wind turbine share at least one of the plurality of anchor.
  • the first floating wind turbine, the second floating wind turbine and the vessel all share an anchor.
  • first floating wind turbine and the second floating wind turbine are arranged at opposite sides of the vessel.
  • the anchors are suction anchors.
  • Fig. 1 schematically depicts a side view of a combination of a vessel for offshore operations and two floating wind turbines according to an embodiment of the invention
  • Fig. 2 schematically depicts a plan view of the combination of Fig. 1 ;
  • Fig. 3A schematically depicts an oil field with two wellbores and the positioning of a vessel over one wellbore in accordance with a first arrangement
  • Fig. 3B schematically depicts the oil field of Fig. 3A with the vessel being positioned over the other wellbore in accordance with a second arrangement
  • Fig. 4A schematically depicts an oil field with two wellbores and the positioning of a vessel over one wellbore in accordance with a third arrangement; and Fig. 4B schematically depicts the oil field of Fig. 4A with the vessel being positioned over the other wellbore in accordance with a fourth arrangement.
  • Figs. 1 and 2 schematically depict a combination of a vessel V for offshore operations, a first floating wind turbine FW1, and a second floating wind turbine FW2.
  • the vessel V and wind turbines FW1, FW2 are located offshore at a site where the sea bottom SB is at a depth D.
  • Fig. 1 depicts a side view while Fig. 2 depicts a plan view.
  • the vessel V may be a semisubmersible vessel configured to perform wellbore-related activities, such as workover activities, well maintenance, installing an object on a subsea wellbore, drilling a subsea wellbore, oil production via a wellbore, etc.
  • the vessel V is therefore positioned over a wellbore WB.
  • the first and second floating wind turbine FW1, FW2 are provided near the vessel V to provide power from the wind to the vessel V.
  • the fact that the wind turbines are floating makes it easy to change the position of the wind turbines and adapt the position to the position of the vessel V. It is for instance possible that the first and second wind turbines FW1, FW2 follow the vessel during wellbore-related activities within a field of multiple wellbores.
  • Another advantage of the floating wind turbines FW1, FW2 is that they can be used independent of the water depth D.
  • each wind turbine FW1, FW2 has an associated power line PL, preferably provided slack on the sea bottom SB to prevent any overload of the power lines PL due to relative motions between the wind turbines and the vessel.
  • a power line PL preferably provided slack on the sea bottom SB to prevent any overload of the power lines PL due to relative motions between the wind turbines and the vessel.
  • a plurality of anchors is provided in the sea bottom SB.
  • a total of ten anchors are provided.
  • Anchors that are only connected to the vessel V by a mooring line ML are indicated using reference symbol AV.
  • Anchors that are only connected to a wind turbine FW1, FW2 by a mooring line ML are indicated using reference symbol AW.
  • Anchors that are connected to both the vessel V and a wind turbine FW1, FW2 by a mooring line MO and thus shared by the vessel V and wind turbine FW1, FW2 are indicated using reference symbol AVW.
  • the anchors AV, AW, AVW may be of the suction type allowing to lower the anchors to the sea bottom SB, pumping water out of the anchors to apply negative pressure inside the anchor resulting in the anchor being sucked into the sea bottom SB.
  • This installation process is time-consuming and has a negative influence on sea life near or in the sea bottom SB. Reducing the number of anchors required for achieving the same result thus has a huge advantage.
  • the first and second wind turbines FW1, FW2 are arranged at opposite sides of the vessel V.
  • the symmetrical arrangement has the advantage that loads applied to the anchors are also more or less symmetrical and may compensate each other.
  • Wind and current may apply loads to the vessel V and the wind turbines FW1, FW2 urging them in a certain direction.
  • An example of such a direction is indicated in Fig. 1 as arrow UD.
  • Urging the first wind turbine FW1 in the direction UD towards the vessel V will increase the tension in the mooring line ML connected to the first wind turbine FW1, but will simultaneously decrease the tension in the mooring lines MO connected to the first wind turbine FW1.
  • Urging the second wind turbine FW2 in the direction UD away from the vessel V will decrease the tension in the mooring line ML connected to the second wind turbine FW2, but will simultaneously increase the tension in the mooring lines MO connected to the second wind turbine FW2.
  • Urging the vessel V in a direction UD towards the second wind turbine FW2 will increase the tension in the mooring lines MO connected to vessel V and extending towards the first wind turbine FW1, but will simultaneously decrease the tension in the mooring lines MO connected to the vessel V and extending towards the second wind turbine FW2. As a result thereof, the loads applied to the anchors AVW will not significantly increase due to sharing of the anchors.
  • Fig. 3A schematically depicts a plan view of an oil field with two wellbores WB, WB2 at a certain distance from each other.
  • a first set of anchors is installed in a pattern similar to the pattern of anchors shown in Figs. 1 and 2.
  • the anchors belonging to the first set of anchors all have reference symbols starting with the letter “A” and ending with the numeral “1”.
  • the vessel V, the first floating wind turbine FW1 and the second floating wind turbine FW2 similar to the embodiment of Figs. 1 and 2 have been schematically indicated in Fig. 3A.
  • Anchors connected to the vessel include the letter “V” in their reference symbol while anchors connected to a wind turbine include the letter “W’ in their reference symbol.
  • Mooring lines connected to a shared anchor AVW1 are indicated using reference symbol MO while mooring lines connected to a non-shared anchor AV1 or AW1 are indicated using reference symbol ML.
  • Fig. 3A also depicts a second set of anchors installed around the second wellbore WB2 in a pattern similar to the pattern of the first set of anchors, although this pattern is not complete as will be explained below in more detail.
  • the anchors belonging to the second set of anchors all have reference symbols starting with the letter “A” and ending with the numeral “2”.
  • all anchors i.e. the anchors of the first set of anchors and the anchors of the second set of anchors are installed prior to performing any operations with the vessel V.
  • the first set of anchors is installed first, the vessel V and the wind turbines FW1, FW2 are connected to the first set of anchors as shown in Fig. 3A and subsequently while the vessel V is performing operations, the second set of anchors is installed.
  • the vessel When the second set of anchors is installed, the vessel can be moved to the second wellbore WB2 by disconnecting from the anchors of the first set of anchors, sailing towards the second wellbore WB2 and connecting the vessel and wind turbines to the second set of anchors and the first set of anchors as depicted in Fig. 3B.
  • anchors used in the first arrangement are square
  • anchors used in the second arrangement are circular
  • anchors used in both the first and second arrangement are square with an inscribed circle.
  • the anchors used in both the first and second arrangement are the anchors AVW1 of the first set of anchors. This may also be referred to as sharing of anchors in the first and second arrangement and results in less anchors needed when going through an oil field.
  • Fig. 4A schematically depicts a plan view of an oil filed with two wellbores WB, WB2 at a certain distance from each other.
  • a first set of anchors is installed in a pattern similar to the pattern of anchors shown in Figs. 1 and 2.
  • the anchors belonging to the first set of anchors all have reference symbols starting with the letter “A” and ending with the numeral “1”.
  • the vessel V, the first floating wind turbine FW1 and the second floating wind turbine FW2 similar to the embodiment of Figs. 1 and 2 have been schematically indicated in Fig. 4A.
  • Anchors connected to the vessel include the letter “V” in their reference symbol while anchors connected to a wind turbine include the letter “W’ in their reference symbol.
  • Mooring lines connected to a shared anchor AVW1 are indicated using reference symbol MO while mooring lines connected to a non-shared anchor AV1 or AW1 are indicated using reference symbol ML.
  • Fig. 4A also depicts a second set of anchors installed around the second wellbore WB2 in a pattern similar to the pattern of the first set of anchors, although this pattern is not complete as will be explained below in more detail.
  • the anchors belonging to the second set of anchors all have reference symbols starting with the letter “A” and ending with the numeral “2”.
  • the vessel When the second set of anchors is installed, the vessel can be moved to the second wellbore WB2 by disconnecting from the anchors of the first set of anchors, sailing towards the second wellbore WB2 and connecting the vessel to the second set of anchors and the first set of anchors as depicted in Fig. 4B.
  • anchors used in the third arrangement are square
  • anchors used in the fourth arrangement are circular
  • anchors used in both the third and fourth arrangement are square with an inscribed circle.
  • anchor AVW1 in Fig. 4A shared by the vessel V and the first wind turbine FW1 and not the second wind turbine FW2 is indicated as anchor AW1 in Fig. 4B as it is no longer connected to the vessel V.
  • anchor AW1 in Fig. 4A shared by the vessel V and the first wind turbine FW1 and not the second wind turbine FW2 is indicated as anchor AW1 in Fig. 4B as it is no longer connected to the vessel V.
  • anchor AW1 in Fig. 4A that in Fig. 4B is connected to the vessel V and thus renamed to be an anchor AVW1.
  • the corresponding mooring lines MO and ML have also switched.

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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)
  • Wind Motors (AREA)

Abstract

L'invention concerne un procédé pour faire fonctionner un navire pour des opérations en mer et une éolienne flottante pour fournir l'énergie du vent au navire, le procédé comprenant les étapes suivantes : a. faire naviguer le navire et l'éolienne flottante jusqu'à un site en mer où des opérations doivent être effectuées par le navire ; b. fournir une pluralité d'ancres dans un fond marin ; c. amarrer le navire à la pluralité d'ancres ; et d. amarrer l'éolienne flottante à la pluralité d'ancres de sorte que le navire et l'éolienne flottante partagent au moins l'une de la pluralité d'ancres.
PCT/EP2020/079515 2019-10-21 2020-10-20 Procédé de fonctionnement d'un navire et d'une éolienne flottante et combinaison d'un navire et d'une éolienne flottante WO2021078748A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
NO20220588A NO20220588A1 (en) 2019-10-21 2020-10-20 A method for operating a vessel and a floating wind turbine and a combination of vessel and floating wind turbine

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL2024072 2019-10-21
NL2024072A NL2024072B1 (en) 2019-10-21 2019-10-21 A method for operating a vessel and a floating wind turbine and a combination of vessel and floating wind turbine.

Publications (1)

Publication Number Publication Date
WO2021078748A1 true WO2021078748A1 (fr) 2021-04-29

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PCT/EP2020/079515 WO2021078748A1 (fr) 2019-10-21 2020-10-20 Procédé de fonctionnement d'un navire et d'une éolienne flottante et combinaison d'un navire et d'une éolienne flottante

Country Status (3)

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NL (1) NL2024072B1 (fr)
NO (1) NO20220588A1 (fr)
WO (1) WO2021078748A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006038091A2 (fr) * 2004-10-06 2006-04-13 Enertec Ag Procede de construction d'une fondation marine immergee avec poussee verticale bloquee, utilisee en tant que base de support pour l'installation d'une eolienne, d'un electrolyseur pour l'electrolyse d'eau et d'autres equipements combines avec la pisciculture
EP2604501A1 (fr) * 2011-12-15 2013-06-19 Andreas Graf Système d'ancrage et d'amarrage de tours d'éolienne flottantes et procédés correspondants pour le remorquage et l'érection de celles-ci
WO2017105663A1 (fr) * 2015-12-18 2017-06-22 Barber Gerald L Éolienne avec caractéristiques de sécurité améliorées

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006038091A2 (fr) * 2004-10-06 2006-04-13 Enertec Ag Procede de construction d'une fondation marine immergee avec poussee verticale bloquee, utilisee en tant que base de support pour l'installation d'une eolienne, d'un electrolyseur pour l'electrolyse d'eau et d'autres equipements combines avec la pisciculture
EP2604501A1 (fr) * 2011-12-15 2013-06-19 Andreas Graf Système d'ancrage et d'amarrage de tours d'éolienne flottantes et procédés correspondants pour le remorquage et l'érection de celles-ci
WO2017105663A1 (fr) * 2015-12-18 2017-06-22 Barber Gerald L Éolienne avec caractéristiques de sécurité améliorées

Also Published As

Publication number Publication date
NO20220588A1 (en) 2022-05-19
NL2024072B1 (en) 2021-06-22

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