Subsea structure and method for installing the structure and rec

Wells – Receptacles – With separate air chamber having openable passage

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Details

61 1F, 61 97, 61 50, 61 69R, 166 5, 175 9, E21B 4301, B01D 1900

Patent

active

039876381

ABSTRACT:
A structure or template forms a tubular support structure for subsea equipment used in drilling and producing offshore oil and/or gas wells. The template contains production manifolding, remote and safety shut-in control, pump-separator, and pipeline connector subsystems. Certain of the structural tubes are segregated to form compartmented ballast chambers capable of being selectively flooded and dewatered. Certain other structural tubes form piling sleeves. The truss or framework of structural tubes include vertical and horizontal tubes, the latter forming circumferential members as well as interstitial supports. The uppermost of the circumferential members or "ring" also functions as a fender to protect the equipment within the template. The template is made negatively buoyant upon launch by flooding the compartmented ballast chambers, keelhauled (swung to a position underneath the keel of the drilling vessel), and then lowered to the subsea floor. Once it is positioned on the sea floor the subsea structure is oriented, pile founded and leveled. The template functions as a drilling and casing guide frame ensuring that drilled wells are connectable to the preinstalled manifolding. The template is recoverable by severing the piles and deballasting the compartmented ballast chambers.

REFERENCES:
patent: 3113699 (1963-12-01), Crawford et al.
patent: 3186487 (1965-06-01), Geer et al.
patent: 3430695 (1969-03-01), Hubbard
patent: 3633667 (1972-01-01), Falkner, Jr.
patent: 3754380 (1973-08-01), McMinn et al.
patent: 3877520 (1975-04-01), Putnam
patent: 3881549 (1975-05-01), Thomas

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