摘要:
The invention relates to a seafloor/surface connecting installation for a submarine pipeline (10) which rests on the seafloor, e.g. at a great depth. The inventive installation comprises at least one vertical riser (5), the lower end of which is connected to at least one submarine pipeline (10) resting on the seafloor by means of an anchoring system comprising a base (4) which is also disposed on the seafloor. According to the invention, the aforementioned base (4) supports and guides the connecting elements (11-13) between the vertical riser (5) and the pipeline resting on the seafloor (10), said connecting elements (11-13) including a rigid pipe element comprising an elbow-type bend (11). The above-mentioned connecting elements (11-13) are supported and guided in such a way that they can only move in translation in a single longitudinal direction (YY') which essentially corresponds to the axial direction of the submarine pipeline resting on the seafloor (10).
摘要:
A riser for connection between a vessel and a fixed connection point on the seabed, in the form of an 'L', where the bottom riser arm is connected to the fixed point (2) on the seabed and the top riser arm (3) is connected to the vessel at the point (4). An elastic element (5) is connected to the bend (6) between the riser's arms and an anchoring point (7) on the seabed.
摘要:
An improved marine riser (12a,12b) is described which has couplings (20,22) with screw-threads for securing marine riser sections together and a carousel mechanism (50) for coupling the auxiliary lines (14) to the marine riser sections (12a,12b) at various locations along the sections to permit the lines (14) to rotate freely relative to the marine riser sections as the sections are rotatably assembled. An improved buoyancy module (110,118) is also described which houses the choke and kill lines (116) in buoyancy module fairing portions (114,120,122) for reducing the effective module diameter and the effect of current and vortex shedding.
摘要:
A reinforced flexible tubular pipe comprises an inner liner (3) that forms a barrier against outflow of the medium that flows through the pipe, said inner liner (3) being encased by at least one reinforcing layer, each of which comprising a space in which a number of profiles are configured that are coiled around the inner liner in such a manner that the profiles are completely or partially surrounded by a lumen (10) that allows transport of fluids in the longitudinal direction of the pipe, and wherein - outside the reinforcing layer - an outer coating (9) is configured with a view to forming a barrier against inflow of fluids or gases from the surroundings of the pipe to the reinforcing layer. At least one flow path (11) is provided with a view to conveying fluid or gas away from the above-mentioned lumen (10). This flow path (11) is provided with an inlet opening that debouches in the lumen (10) and an outlet opening (13) that ends in the inner liener of the tubular pipe. Conveniently the flow path (11) is provided with means (12), such as a pump (12) or a one-way valve (15) that prevents fluid or gas from flowing into the lumen from the pipe interior.
摘要:
A special installation of a riser (10) that extends between an item of subsea equipment (14) and a surface vessel (12) has been described, which installation in particular is intended for use in connection with offshore oil extration, and in which the rise (10) is provided with a telescopic section. For the purpose of heave compensation, the riser (10) is installed in a manner such tat said telescopic section (18) is located at the lower end of the riser (10), heave compensation being effected by the telescopic mobility of the riser (10), while the mass of the riser (10), when suspended in this manner, keeps the rise (10) tensioned.
摘要:
A mechanical joint assembly (600, 610, 700, 800, 900) for a steel catenary riser (400) (SCR). The lower section of the mechanical joint assembly (600, 610, 700, 800, 900) is comprised of steel or alternate high strength components, rather than elastomers to absorb the high loads and increase life of the unit. The lower mechanical joint assembly provides for reduction of bending moments and resulting fatigue stresses at the SCR top by removing resistance to movement in all angular directions, providing increased construction tolerances for the pipeline approach corridor. Pipeline approach angle increase is accommodated by providing dual orthogonal trunnions (635, 681) in addition to an axial swivel. The upper mechanical joint assembly, acting without riser tension loads, allows for the use of either flexible high-pressure pipe or swivel arrangements (700) to accommodate angular flexure before the rigid deck piping (500). The mechanical joint assembly provides for upstream (900) and downstream (800) valving for safety and maintenance without decreasing the fatigue life of SCR's.
摘要:
A floating platform system supports one or more decks (14) above the water surface for accommodating equipment to process oil, gas and water recovered from a subsea hydrocarbon formation. The platform is secured to the seabed by one or more tendoms (17). A central column (12) of the platform includes a moonpool (19) extending axially through the central column (12). The moonpool (19) is open at the lower and upper ends thereof. Riser lateral restraint members (32) are supported within the moonpool (19) for laterally restraining risers (16) disposed in the moonpool (19) and minimizing riser spacing and riser deflection.
摘要:
The invention concerns a device connecting the sea floor to the surface comprising a submarine pipeline attached to at least one floater comprising a coaxial canister (1) enclosing said pipeline (2) and means joining (3) said canister and said pipeline at the upper (5) and lower (6) openings of said canister (1) traversed by said pipeline. The invention is characterised in that said joining means comprise a sealed articulation (3) assembled around said pipeline (2) to at least one of the upper (5) or lower (6) openings of said canister (1), in particular a flexible elastic articulation such as a laminated stop element.
摘要:
A stress relief joint (10) for use with riser pipe (22) in floating systems wherein a vessel is subjected to variable motion caused by wind, currents and/or wave action. The riser pipe (22) has one end connectable to the sea floor and an upper portion arranged to pass through an opening at the bottom of the vessel. The lower end, which is connectable to other pipes at the sea floor, is provided with concentric pipes or sleeves (30, 32) around the riser (22). The lower ends of the pipes (30, 32) and riser (22) are welded to a flange (34). The upper end of each of the concentric pipes (30, 32) extends beyond the upper end of the pipe immediately surrounding it. The annulus between the concentric pipes (30, 32) and the riser (22) may be filled with a durable and pliable material (36). Also, shims (38) may be inserted in the annulus at the end of each pipe segment.
摘要:
A reinforced flexible tubular pipe comprises an inner liner (3) that forms a barrier against outflow of the medium that flows through the pipe, said inner liner (3) being encased by at least one reinforcing layer, each of which comprising a space in which a number of profiles are configured that are coiled around the inner liner in such a manner that the profiles are completely or partially surrounded by a lumen (10) that allows transport of fluids in the longitudinal direction of the pipe, and wherein - outside the reinforcing layer - an outer coating (9) is configured with a view to forming a barrier against inflow of fluids or gases from the surroundings of the pipe to the reinforcing layer. At least one flow path (11) is provided with a view to conveying fluid or gas away from the above-mentioned lumen (10). This flow path (11) is provided with an inlet opening that debouches in the lumen (10) and an outlet opening (13) that ends in the inner liener of the tubular pipe. Conveniently the flow path (11) is provided with means (12), such as a pump (12) or a one-way valve (15) that prevents fluid or gas from flowing into the lumen from the pipe interior.