Hull construction
First Claim
1. A hull construction for a vessel comprisinga deck;
- a keel below said deck;
at least one well at a mid-section of said deck extending vertically from and between said deck and said keel for an inward and outward flow of seawater from below; and
at least one inwardly projecting lip in said well forming a constricted opening in said well to delay said inward and outward flow of seawater in said well to improve the inertial resistance of the hull construction against heaving motions.
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Accused Products
Abstract
The present invention relates to a hull construction for a vessel, especially a drilling and/or production vessel for hydrocarbons. The invention also relates to the application of the hull construction according to the invention.
The invention is especially related to designing hulls for single hull ships which are provided for carrying our operations at sea, and especially vessels which are used for drilling petroleum wells, and for intervention and maintenance of this type of well. With the invention, the aim is to provide a hull shape for a vessel which makes the vessel especially well suited for realising these types of well operations in deeper waters and at sea, and so that the vessel can be operative even under difficult weather conditions which are created by waves, ocean currents and winds. The hull design according to the invention will also be well suited for ships which are employed for other current purposes where it is important to control movements of the ship in waves, by way of example in production ships for hydrocarbons, and in ships which carry out seismic investigations of formations beneath the sea bottom.
Drilling after oil and gas at sea is carried out either with floating drilling vessels or devices fastened to the bottom The known floating types of vessel can either be half submergible drilling rigs, which are also called ‘semisubs’, or can comprise drilling ships for this type of operation.
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Citations
24 Claims
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1. A hull construction for a vessel comprising
a deck; -
a keel below said deck;
at least one well at a mid-section of said deck extending vertically from and between said deck and said keel for an inward and outward flow of seawater from below; and
at least one inwardly projecting lip in said well forming a constricted opening in said well to delay said inward and outward flow of seawater in said well to improve the inertial resistance of the hull construction against heaving motions. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A hull construction for a seagoing vessel comprising
a deck for receiving drilling equipment thereon; -
a flat bottomed keel below said deck;
a pluralty of wells at a mid-section of said deck, each well extending vertically from and between said deck and said keel for an inward and outward flow of seawater from below; and
at least one inwardly projecting lip in at least one of said wells forming a constricted opening in said one well to delay said inward and outward flow of seawater in said one well to improve the inertial resistance of the hull construction against heaving motions. - View Dependent Claims (20, 21, 22, 23, 24)
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Specification