Abstract:
There is described apparatus for use in installing a substructure, and related methods. In embodiments of the invention, the apparatus comprises a positioning device attached to a leg of the substructure. The substructure comprises at least one leg to be mounted to at least one base, and the positioning device comprising at least one jack for supporting the leg upon the base, such that at least part of the weight of the substructure is supported on the base via the jack. In this way, relative movement between the leg and the base can be reduced, to allow permanent mounting of the leg to the base for example by using a curable material.
Abstract:
The present invention relates to a wire cutting system and method for subsea cutting of large structures (6). The system includes two feeding towers (2) with feeding tower first ends secured into a seabed floor. A crossbeam (1) is located between the two feeding towers (2). Wire feeding trolleys (8) are connected to the feeding towers (2), whereby the wire feeding trolleys (8) are allowed to move a cutting distance along the feeding towers. A cutting wire (4) traverses between the wire feeding trolleys.
Abstract:
The publication relates to a shallow water seabed terminal (40) for storing and loading or unloading hydrocarbons, such as LNG, oil or gas, comprising a floatable, removable module (20), and a removable seabed substructure (10) intended to be supported by a seabed (19), the floatable module (20) being releasably fixed to the seabed substructure (10) so that a harbour terminal is formed, the seabed substructure (10) comprises a base structure (11) provided with buoyancy devices, an upwards extending wall structure (12) extending up from the base structure (11) and arranged along at least a part of the periphery of the base structure (11), the base structure also being provided with an opening (18) in the wall structure (12) for allowing the floatable module (20), to be berthed in and supported by the seabed substructure (10). The base structure (11) is provided with a submerged beam or base slab structure (35) extending laterally out from the vertical wall structure (12), configured to support the floatable, removable module, the beam or slab structure (35) being provided with sleeves or ducts extending through the submerged beam or slab structure (35) configured to receive the piles to be driven down into the seabed soil.
Abstract:
An offshore support structure is provided comprising at least one upper support structure section for supporting at least one functional device with a functional mass, at least one lower support structure section for founding the offshore support structure at a seabed of a sea and at least one transition support structure section which is arranged between the upper support structure section and the lower support structure section for physically connecting the upper support structures section and the lower support structure section. The upper support structure section, the functional device and the transition support structure section comprise together an upper support structure mass. The lower support structure section comprises a lower support structure mass. A mass ratio of the lower support structure mass to the upper support structure mass is selected from the range from 1.1 to 2. The lower support structure section forms a foundation of a offshore tower installation. The lower support structure section of is arranged at a seabed of a sea. Preferably, it is arranged such that the transition support structure section remains arranged above a sea water level (surface of water) of the sea. Thereby, tides which affect the sea water level have to be taken into account as well as a height of the highest waves. With such an arrangement it is possible that the transition support structure section is developed with a lower mass in comparison to an arrangement where the transition support structure section is in the water. Buoyancy force doesn't affect the gravity foundation function of the transition support structure section. The offshore tower installation is used for offshore wind power plants.
Abstract:
Improved embodiments, apparatus and method relating to the manufacture and installation of offshore steel support structures,known as jackets, for Wind Turbine Generators, including transition pieces thereof.
Abstract:
A leg mating unit for installation of offshore structures. A housing has a ram movably mounted in the housing. Elastomeric material is received in the housing immediately below the ram. An open space below the elastomeric material is filled with a disposable, granular material such as sand. A drain valve for selectively releasing the disposable material is provided on the housing. A load absorbing ring is engaged with the ram. A stop ring is rigidly mounted on the leg of the topside structure and engages the load absorbing ring during installation of the topside structure onto its lower supporting structure. The housing is removably mounted on the lower support structure such that the leg mating unit is removable and reusable.
Abstract:
Изобретения относятся к способам и устройствам для подводной добычи углеводородов. Способ включает бурение скважины и дальнейшие добычные работы, которые выполняют с надводной платформы, ограждение водного пространства над скважиной до поверхности моря оболочкой, обеспечивая тем самым всплывание нефти внутри оболочки. Оболочка выполнена из отдельных секций и монтируется на плаву. В нижней секции выполнено герметичное бетонное днище, причем после касания оболочкой дна она временно фиксируется в вертикальном положении, после чего сквозь днище в морском дне до внедрения в коренные породы бурят выработку, которая вместе с придонной частью оболочки заполняется бетоном. После затвердения бетона в морском дне образуется свая, которая обеспечивает дальнейшую фиксацию оболочки. Буровая мелочь, поступающая из скважины в донную часть оболочки, выдается на платформу посредством эрлифта. Технический результат состоит в том, что технология исключает утечки нефти в акваторию, при этом повышается эффективность добычи углеводородов.
Abstract:
The invention relates to a vessel for lifting operations at sea, comprising a semisubmersible hull, wherein said hull comprises at least one pontoon structure, a deck structure, columns between the pontoon structure and the deck structure, and vertically movable legs, and wherein the vessel is provided with one A-shaped lifting frame tiltably connected to the deck structure for lifting cargo next to the lifting vessel. The invention relates also to a method of securing a semi submersible vessel to a seabed and to a oil and pitch compensator suitable for stabilizing cargo on a sea transportation vessel.
Abstract:
A self installing offshore platform 1, designed for use in the sea as a substation for offshore wind parks but also usable in oil and gas recovery, of the type that includes multiple lower pontoons 5 arranged in a spaced relation or connected, e.g. in a ring, and at least three columns 10 mounted in the lower end regions thereof to the pontoons 5 and mounted in the upper end regions thereof to a platform deck structure 15. A ratio of the volume of pontoons 5 to the volume of columns is in the range of 0.8 to 1.5.