摘要:
A buoyancy compensating assembly (500) and method of deploying a riser assembly are disclosed. The buoyancy compensating (assembly 500) for connection to a portion of flexible pipe, comprises at least one rigid buoyancy module (502) for connection to a riser; and at least one regulating element (590) configured to control the pressure within the at least one rigid buoyancy module 502 in use.
摘要:
A drilling marine riser section comprises a main riser pipe with radially extending flanges and multiple auxiliary pipes at least comprising a choke line and a kill line. One or more clamps retain the auxiliary pipes. Further the riser section has buoyancy members. The choke line and the kill line are connected to each of the flanges in a tensile load sharing arrangement, so that - in vertical use orientation of the riser section in a riser string - weight stress is distributed in the main riser pipe and the choke line and the kill line. The buoyancy members form an exterior of the riser section including diametrically opposed and parallel flat bottom and top stacking faces relative to the axis of the main riser pipe, allowing stacking of riser sections in horizontal orientation. The choke line and the kill line are arranged diametrically opposite from one another and between the flat bottom and top stacking faces.
摘要:
A method of forming a buoyancy module for a subsea buoyancy system, including the steps of : forming a shell at least partially using an additive manufacturing process; introducing a buoyancy material into the shell; and sealing the shell.
摘要:
The present invention relates to a marine drilling riser joint, adapted for the securement of one or more umbilicals thereto. The marine drilling riser joint comprises one or more umbilical gutter assemblies, connected to or formed integral in an outer surface of a buoyancy module on the exterior of the marine drilling riser joint and provided parallel to the riser pipe, the umbilical gutter assembly comprising: an umbilical gutter adapted to accommodate one or more umbilicals; and a resilient gutter cover, which is elastically deformable by a loom tool, which resilient gutter cover in a closed position covers the umbilical gutter and in an elastically deformed position provides a working clearance to allow the one or more umbilicals to be introduced into the umbilical gutter.
摘要:
A clamp for a flexible pipe, to provide a load bearing flange on the flexible pipe permitting buoyancy jackets to be joined thereto. The clamp has a longitudinal axis arranged to extend along the length of the flexible pipe and a radial axis being perpendicular to the longitudinal axis. The clamp further comprises: a plurality of separate clamp elements being supported together in a radial array extending at least partially around the longitudinal axis; engagement means located between neighbouring clamp elements to movably interconnect the clamp elements; and a strap being adapted to surround the clamp elements, in use for exerting a compressive force thereon. Also provided is a clamp element for use in the aforementioned clamp.
摘要:
A method and apparatus for bundling flexible risers uses a vertically-hanging riser support shaft extending below the turret of a turret-moored FPSO to manage the motions of the risers. The risers may transition to a catenary configuration as they exit a bottom structure at the lower end of the riser support shaft and connect to wellheads or flowlines on the seafloor. Certain embodiments are suitable for use with a disconnectable buoyant turret mooring system while other embodiments may be used with spread-moored FPSOs.
摘要:
The invention relates to a system (1) for transporting hydrocarbons from reserves located under the sea floor (2) to a turret (3) connected to a hydrocarbon production vessel floating at the sea surface, the hydrocarbons being transferred through at least one rigid catenary riser (4) extending from the sea floor (2) to a buoy (6), said system for transporting hydrocarbons comprising an upper section of the at least one substantially rigid riser (4) directly attached to the buoy and provided with fairings, a middle section of the rigid riser (4) is provided with buoyancy modules (8) so to give it a lazy wave shape and a lower section of the substantially rigid riser (4) is in contact with the seafloor at a distance X from the buoy vertical axis that is smaller than a distance Y between the buoy vertical axis and the mooring lines anchoring means.
摘要:
A riser tension augmentation system includes a riser joint collar and a plurality of inflatable sleeves attached to the riser joint collar. Each inflatable sleeve includes a fill valve, a relief valve, and a bleed valve. A method of augmenting riser tension includes attaching a riser joint collar to a riser joint and attaching a plurality of inflatable sleeves to the riser joint collar.
摘要:
A coated or sleeved pipe for a hybrid riser tower has at least one stop formation that is integral with or attached to an external coating or sleeve of the pipe. The stop formation is arranged to restrain movement along the pipe of a structure attached to the pipe, such as a guide frame.
摘要:
A riser assembly and method of providing a riser assembly for transporting production fluids from a location deep under water are disclosed. The riser assembly includes a riser comprising a flexible pipe, the riser having a hang off point which is an end of the riser that in use connects with a floating facility, and a touchdown zone which in use is a section of the riser in the region of where the riser meets the seabed or other fixed structure; and at least one buoyancy element arranged at the touchdown zone or within about 50 m of the touchdown zone of the riser to support the riser in a configuration for accommodating kinetic energy propagating along the riser from the hang off point.