Abstract: This naval platform (14) supporting a wind turbine (12) for offshore electrical energy production comprises a main support column (24) of said wind turbine (12), and two secondary columns (26); each column including at least one shell having an outer surface delimiting an outer volume; the main column (24) being coupled to the two secondary columns (26). The outer volume delimited by the shell (28A) of the main column (24) is greater than the respective outer volumes delimited by an outer surface of the shell (28B, 28C) of each secondary column (26).

Abstract: An installation is provided. The installation includes a plurality of tanks, each tank including a filling opening and being adapted to be arranged on the sea bottom around the well and a device for capturing and distributing hydrocarbons escaping the well. The device includes a bell, a positioner for positioning the bell above the well and a connector for selectively connecting an apex of the bell to the filling opening of any one of the tanks in a fluid manner so as to transfer the fluid into that opening. The invention is applicable to uncontrolled eruptions of offshore oil wells.

Abstract: The invention relates to the assembly of a tube (1) made from composite material and a tubular metal part (2) in order to produce pipes. The assembly process comprises:—inserting a portion of the metal part (2) into the composite material tube (1); and—radially deforming the metal part (2) to a plastic deformation range sufficient to cause elastic deformation of said composite material tube (1), in order to obtain a radial contact between the outer wall of the metal part (2) and the inner wall of the composite material tube (1).

Abstract: A device including a tank adapted to be arranged on a sea bottom having a filling opening is provided. The tank includes an inflatable bladder with an elongated shape, made from a flexible material, provided with the filling opening at one end and equipped with connecting members. At least one cable extends over at least the largest length of the bladder and is connected thereto by the connecting members. The present invention is applicable to the treatment of uncontrolled eruptions of offshore oil wells.

Abstract: An installation is provided. The installation includes a plurality of tanks, each tank including a filling opening and being adapted to be arranged on the sea bottom around the well and a device for capturing and distributing hydrocarbons escaping the well. The device includes a bell, a positioner for positioning the bell above the well and a connector for selectively connecting an apex of the bell to the filling opening of any one of the tanks in a fluid manner so as to transfer the fluid into that opening. The invention is applicable to uncontrolled eruptions of offshore oil wells.

Abstract: A floating terminal for loading/offloading cargo of ships such as methane tankers comprises an area for mooring ships and a submerged skirt to damp oscillation of the terminal to attenuate relative movement of the terminal and ships in the mooring area.

Abstract: The method of constructing an LNG or LPG terminal (3) of the type comprising an external structure (7) and at least one storage tank (11; 11a, 11b, 11c), which method is characterized in that it comprises the steps of: constructing said external structure (7), in parallel and independently, constructing said storage tank (11; 11a, 11b, 11c), when the construction of said external structure (7) and said storage tank (11; 11a, 11b, 11c) is completed or on the point of being completed, floating said external structure (7) and said storage tank (11; 11a, 11b, 11c), floating said storage tank (11; 11a, 11b, 11c) into said external structure (7), and fixing said storage tank (11; 11a, 11b, 11c) to the interior of said external structure (7).

Abstract: A floating system for very deep water includes a floating structure (1) subject to the external loadings (7, 8, 9) inducing stresses, the floating structure (1) being held in position on the sea bed by one or several tensioned lines (2) made of a material having given mechanical properties. The tensioned line or lines (2) are made of a material that is not very sensitive to fatigue stresses and the tensioned line or lines are sized in a manner independent of the fatigue phenomena associated with the dynamic behavior of the floating system under the effect of external loadings.

Abstract: A method for transporting petroleum products in deep water from the seabed up to a floating or semi-submersible surface structure wherein at least one rigid and straight hybrid riser extends vertically. The hybrid riser has a rigid central hollow tubular structure surrounded by a cylindrical block of syntactic material which provides buoyancy and thermal insulation for the riser. A plurality of rigid pipelines are embedded in the syntactic material and surround the central tubular structure for receiving petroleum products from wells on the sea bed. The bottom of the riser is connected to a suction or gravity anchor at the sea bed. A submerged float is attached to the top of the riser and exerts an upward vertical force thereon. Flexible pipelines connect the rigid pipelines in the riser to the floating or semi-submersible structure.

Abstract: A pipeline comprises flow lines in which petroleum products flow and a protective carrier pipe around the flow lines. It further comprises a buoyancy module made of a thermally insulative material that is mechanically resistant to the hydrostatic pressure at the underwater site at which the pipeline is installed, the module providing the buoyancy required for installing the pipeline, in an economical manner.

Abstract: The platform comprises a buoyant sub-structure comprising a base and a plurality of columns upstanding from said base, a buoyant deck-hull mounted on the columns and means for ballasting and deballasting at least the base of said sub-structure. It further comprises means for tangentially guiding said deck-hull on said columns during deployment of the platform into a predetermined configuration by ballasting of the sub-structure while the deck-hull is floating and means for locking said deck-hull to the columns in said predetermined configuration.

Abstract: A device for transporting petroleum products in deep waters from the seabed up to a floating or semi-submersible surface structure wherein at least one rigid and straight hybrid riser extends vertically. The hybrid riser has a rigid central hollow tubular structure surrounded by a cylindrical block of syntactic material which provides buoyancy and thermal insulation for the riser. A plurality of rigid pipelines are embedded in the syntactic material and surround the central tubular structure for receiving petroleum products from wells on the sea bed. The bottom of the riser is connected to a suction anchor at the sea bed. A submerged float is fixed to the top of the riser and exerts an upward vertical force thereon. Flexible pipelines connect the rigid pipelines in the riser to the floating or semi-submersible structure.

Abstract: The structure comprises a concrete monolithic caisson (3) consisting of a top slab (5) and a bottom slab (5') resting on a seabed. Two concentric peripheral walls (6, 7), an inner and an outer respectively, are designed to withstand the impacts of icebergs. These two walls (6, 7) extend substantially vertically between the slabs (5, 5') and are rigidly connected with them. Vertical partitions are arranged between the two walls so as to connect them in a lattice structure. Vertical defensive elements (8, 9) are disposed over at least a part of the outer periphery of the caisson. The defensive elements (8, 9) are integral with the outer wall of the caisson (3). These caissons are intended for a platform structure located in Arctic regions for production in a hydrocarbon field.

Abstract: A gravity base structure for an offshore platform having deck supporting columns extending from seabed to above seawater level includes bottom and top slabs having inner and outer protective walls extending between them with a lattice structure for transmitting impact energy from the outer wall to the inner wall. The deck supporting columns are substantialy free of means for transmitting impact energy from the inner and outer protective walls to them.

Abstract: A marine platform comprising a deck supported by a tower composed of a rigid fixed structure of the jacket type anchored to the sea floor, an oscillating structure supported by and connected to the fixed structure by flexible piles anchored in the lower part of the fixed structure and arranged on the periphery of the oscillating structure, and by a shear device, the oscillating structure being equipped with a floater. In one embodiment the connection between the fixed and oscillating structures is located in a zone between 30 and 60% of the water depth from the water level. The shear device consisting of at least one set of pairs of structural elements placed obliquely or perpendicularly with respect to the axis of the tower between a lower part of the upper structure and an upper part of the lower structure or of the base and allowing transmission of shear forces and torsional moments between the two parts.

Abstract: Protective barrier consisting of at least two ballastable elements (3, 4) adapted to surround at least partially the work to be protected (1).The height of the individual elements is greater than the water depth. The elements comprise a connection device permitting the structural continuity of the elements after assembly. The protective barrier is entirely independent of the work to be protected. The positioning of the elements around the work is effected by means of a positioning system provided in the sea bed and/or the individual elements of the protective barrier.

Abstract: A gravity base structure for an offshore platform includes a caisson having a bottom slab, a top slab, and inner and outer concentric walls which extend between the bottom and top slabs, and partition walls that form a lattice structure of triangular prisms between the concentric walls, and a plurality of teeth elements which extend outwardly of the outer wall of the caisson for absorbing the force of iceberg impacts and transmitting such force to the caisson.

Abstract: A platform consisting of a rigid structure supporting the deck, floats fixed to the lower part of the rigid structure, and flexible structure formed of piles fixed by their upper ends to the rigid structure and to the floats and by their lower ends to a base provided on the seabed, the piles being held under tension.

Abstract: A platform comprising a deck supported by a tower composed of a rigid fixed structure of the jacket type anchored to the sea floor and of an oscillating structure supported by, and connected to, the fixed structure by flexible piles anchored in the lower part of the fixed structure and arranged on the periphery of the oscillating structure, and by a shear device, the oscillating structure being equipped with a floater. The connection between the fixed and oscillating structures is located in a zone between 30 and 60% of the water depth from the water level.

Abstract: Flexible piles (5) are arranged close to the center of the tower (1) and evenly spaced apart on a circumference the area of which is about 10% of the area of the tower. The product of the total buoyancy of the tower by the arm level between the buoyancy center and the center of the articulation is at least equal to 1.25 times the product of the weight of the platform by the arm level between the center of gravity and the center of the articulation.