Wells – Receptacles – With separate air chamber having openable passage
Patent
1975-11-28
1977-08-09
Shapiro, Jacob
Wells
Receptacles
With separate air chamber having openable passage
61112, 166 5, 175 7, E21B 712
Patent
active
040402649
ABSTRACT:
An underwater riser system in which the primary riser is surrounded by lengths of jacket pipe which form annular buoyancy chambers, there being a pressure fluid supply connected to the buoyancy chambers via valve means including at least a pressure differential valve which controls the amount of water displaced from the chamber by the pressure fluid. Advantageously, the valve means for each chamber also includes remotely controlled means by which the amount of buoyancy provided by the chamber can be varied at will, e.g., from a positive buoyancy to a buoyancy less than the operating weight of the portion of the riser system with which that chamber is associated. In best embodiments, the lengths of jacket pipe are interconnected into a continuous structural unit by connectors each having a female connector member secured to the upper end of the lower length of jacket pipe and a male member secured to the lower end of the upper length of jacket pipe, the female member having an annular bulkhead which closes the space between the jacket and primary riser pipe and on which the valve means is mounted.
REFERENCES:
patent: 3359741 (1967-12-01), Nelson
patent: 3647245 (1972-03-01), Hanes et al.
patent: 3858401 (1975-01-01), Watkins
patent: 3992889 (1976-11-01), Watkins et al.
Armco Steel Corporation
Shapiro Jacob
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