A suction anchor for a subsea well is provided. The suction anchor includes a wellhead support structure. The wellhead support structure is at least in part external of the internal volume of the suction anchor.

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.

A method of installing an upright elongate hollow subsea foundation that is higher than it is wide, such as a suction pile. The foundation is at least partially embedded in seabed soil. A partition layer is placed within the foundation, for example by injecting a grout, supported by a plug of soil that is surrounded by the foundation. The partition layer is placed on the plug of soil at a level that is spaced from the top of the foundation by at least 20% of the height of the foundation. Above the partition layer, the interior of the foundation may be filled with water and/or a rigid body, such as a solid mass or a hollow liquid-filled tank.

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.

A method of connecting a lower pipe portion to a subsea foundation is provided. The method comprises: providing the subsea foundation, wherein the subsea foundation comprises an upper pipe portion connected to the subsea foundation, deploying the subsea foundation subsea; and connecting the lower pipe portion to the upper pipe portion. A subsea foundation system is also provided. The subsea foundation system comprises: a subsea foundation; an upper pipe portion connected to the subsea foundation, and a lower pipe portion, wherein the subsea foundation system is arranged such that subsea the lower pipe portion can be connected to the upper pipe portion. The lower pipe portion may be connected to the subsea foundation in a stowed position before deployment subsea. The lower pipe portion may be connected to a pull-in arrangement before deployment subsea. The subsea foundation may comprise a pipe overlap section that is arranged to overlap a portion of the upper pipe portion and/or the lower pipe portion when the lower pipe portion is connected to the upper pipe portion.

A cofferdam is disclosed that includes an open frame structure having double walls defining a hollow space within each double wall, with each double wall having an open bottom end and a closed top end. Each of the double walls are configured to act as suction piles allowing liquid to be removed from the space within each double wall to thereby induce negative pressure when the cofferdam is installed in a sub-sea configuration. Each of the double walls may include a plurality of partitions respectively defining a plurality of suction piles, the suction piles fluidically coupled by a manifold that may allow liquid to be removed from the suction pile to thereby drive the cofferdam structure into the subsea surface due to the induced negative pressure. A further embodiment cofferdam structure includes an open frame structure and one or more suction piles attached to the open frame structure.

A suction anchor system comprises a substantially tubular suction anchor embeddable in a seabed, a predetermined set of sliding rails, an excavator, and a predetermined set of non-triangular wings disposed about the outer surface of the tubular, and a deployment interface which comprises a deployment cage, a suction anchor lid, and a predetermined set of deployment cage skidding rails disposed about an outer portion of the deployment cage. Using a surface vessel comprising a dispatcher which comprises a storage magazine configured to selectively receive and discharge the suction anchor, a skidding system, and an overhead anchor handler, the suction anchor can be operatively connected and secured to, and placed into fluid communication with, the deployment interface. The deployment interface along its connected suction anchor is lowed from the surface vessel into sea water using the dispatcher until the suction anchor contacts the seabed and allowed to self-penetrate below the seabed due to its own weight.

Assembly of a suction pile and a pump system temporary connected by convenient means to the suction space of the suction pile, wherein the pump system bears onto the top of the upward extending suction pile. Between suction pile and pump system a quick connector is operative comprising a pin operated by actuator means of the pump system to move between a releasing retracted and locking extended position. It has one or more of: a pump interface remote from the protective frame; an auxiliary support frame; a hinged lift appliance; a level indicator; a docking cone designed to penetrate the suction pile interface means.

A suction bucket for a seabed foundation for an offshore facility is provided. The suction bucket is arranged for being embedded into a marine sediment. The suction bucket includes a lid and a sidewall. The sidewall is segmented into a first circumferential segment and at least a second circumferential segment. The first circumferential segment is connected with the second circumferential segment. The first circumferential segment and the second circumferential segment are attached to the lid of the suction bucket. Furthermore, the first circumferential segment and the second circumferential segment each contains at least one substantially planar section. Furthermore, a method to manufacture a suction bucket for a seabed foundation for an offshore facility is also provided.

A method includes mounting a lower platform block (300) to a plurality of piles (215) positioned on a surface. The lower platform block includes a first frame (315), a plurality of docking assemblies (305) connected to the first frame and engaging the piles, and a plurality of conductor tubes (310) connected to the first frame to a plurality of piles. The docking assemblies are released from the piles to separate the lower platform block from the piles.