The present belongs to offshore wind power engineering field, and particularly relates to a convenient-to-disassemble underwater penetration system for offshore wind power and an operation method thereof. The system includes a penetration device, a suction pump, a sonar ranging module and a control module. The penetration device is configured to be detachably butted with a suction bucket. The suction pump is configured to suck the suction bucket by the penetration device to settle the suction bucket. The sonar ranging module is configured to acquire settlement depth data of the suction bucket. The control module is configured to receive the data and to control the suction pump to work according to it, thereby achieving synchronous settlement of different suction buckets. The present invention is capable of achieving automatic multi-bucket synchronous penetration, thereby improving the installation efficiency of the suction bucket for offshore wind power, shortening construction time and reducing construction cost.

An assembly for producing offshore electricity having a wind turbine, a monopile extending along a vertical direction and fully supporting the wind turbine, the monopile penetrating in a seabed, and a subsea jacket comprising: a structure anchored in the seabed and surrounding the monopile around the vertical direction, and a central guide fixed on the structure and surrounding the monopile around the vertical direction while being vertically free with respect to the monopile, the structure being adapted for resisting horizontal loads applied by the monopile on the central guide due to bending movements of the monopile.

The invention relates to a marine structure comprising a foundation system with three or more suction buckets. The suction buckets are designed to be installed in the seafloor to operate as a foundation or part of it to support an offshore structure resting onto the seafloor. The suction buckets support a connector body and the connector body is designed to support a payload. The invention also relates to a method of installing a suction bucket. During the method, the suction bucket bottom penetrates the seafloor and fluid is removed from the suction space such that penetration proceeds by suction.

A method and fixturing apparatus for manufacturing a suction caisson foundation includes providing an elevated center support and peripheral supports, elevating the foundation's prefabricated thumb section atop the center support, and temporarily securing radial frame members about the circumference of the prefabricated thumb section with the each frame member resting atop a respective peripheral support. The skirt panels are then affixed to the frame members, and the frame members to the prefabricated thumb section to thereby become self-supporting. The center support is removed from the interior of the resulting bucket, as by raising the peripheral supports to unload the center support, and lowering and dismantling the center support, whereupon additional panels are affixed to the frame members to define the foundation's lid, and further shaft sections added atop the prefabricated thumb section to complete the foundation. Temporary beams bridging preselected framing members advantageously allow use of transportation crawlers.

The present invention relates to an offshore wind turbine support system and method of installation, where the support system is comprised of two structures, an upper frame lattice structure, and a lower foundation structure that has a plurality of supports embedded in the sea floor, with sleeves of varying length protruding from the supports, such that the top of each sleeve in each foundation structure is about at the same distance below sea level as the top of each sleeve in all other foundation structures of the system.

A offshore structure (10) comprising a tube (12) having a longitudinal axis (32) and comprising an open-ended lower end (22) whose peripheral edge (24) is adapted to cut into the sea bed (14) as the offshore structure (10) is driven into it, the offshore structure (10) comprising: a plurality of stabilisers (18) each comprising a main body portion forming a hollow interior volume (23) and having an open lower end (22) whose peripheral edge (24) is adapted, in use, to cut into the sea bed (14), whereby in use, a trapped volume of fluids is retained in the hollow interior volume between the main body portion and the sea bed (14), each stabiliser (18) further comprising an outlet (34) communicating with its respective hollow interior volume (23) and a control means (36) to control, in use, the egress of the trapped volume of fluids from the hollow interior volume (23) of each respective stabiliser (18), and wherein the geometric centres of the hollow interior volumes (23) of the stabilisers (18) are radially offset (44) from the longitudinal axis (32) of the offshore structure (10).

An oil storage, loading and offloading system includes a submerged oil storage tank with multiple vertically placed flexible containers. The system directly connects to the topsides of an offshore oil production platform above water to assist oil loading and offloading operations. During loading, oil is pumped in and stored inside flexible containers, which are expanded to displace equivalent amount of water out of the oil storage tank; during offloading, oil is pumped out from flexible containers and the reduced volume of each contracted container is then filled in by the equivalent amount of water from the surroundings There is no physical contact between water and oil. The submerged tank on-bottom weight has a limited variation during the loading and offloading operations. This disclosed system can be utilized for fixed offshore platforms, especially for shallow water marginal field developments, and for deepwater floating platforms such as SPAR and semi-submersible (SEMI) structures.

Method for construction of a wind turbine generator on a slip formed concrete on a construction/deployment dry dock barge and delivery of WTG and foundation to the installation site as a complete unit. A split hull hydraulic dump scow facilitates the slip form construction and deployment of the slip-formed gravity anchor(s). The barge is sunk as a dry dock to a draft that permits the WTG/WTG foundation to be floated off. The free floating WTG foundation is ballasted with sea water to its operating draft. The tension legs from the gravity anchors are attached to the WTG foundation. The sea water is then removed from the WTG foundation. The gravity anchor(s) is constructed from slip formed concrete on a split hull hydraulic dump scow and deployed to the installation site, with tension legs attached for deployment and attachment to the WTG platform.

A foundation for a subsea assembly is provided. The foundation includes connection points. The connection points permit other components to be connected to the foundation and permit loads to transfer from the other components into the foundation. The foundation may be a suction anchor. A method of converting an exploration well using the foundation to a production well is also provided.

The present disclosure generally relates to a system and method for installing a tubular element, such as a suction pile, in a bottom of a body of water. The system comprises a tubular element and a deintensifier in fluid communication with the tubular element. The deintensifier is configured to be exposed to an ambient pressure external to the tubular element and reduce pressure within the tubular element. The method comprises lowering the tubular element to the bottom of the body of water, filling the tubular element with water at ambient pressure, and exposing the water within the tubular element to a deintensified external ambient pressure so as to withdraw the water out of the tubular element.