Subsea structure

Details Subsea structure Subsea structure

E - Fixed Constructions

02

B

61/8

E02B 17/02 (2006.01) B63B 21/50 (2006.01) E02D 5/80 (2006.01) E21B 7/128 (2006.01) E21B 29/02 (2006.01) E21B 29/12 (2006.01) E21B 33/14 (2006.01) E21B 43/01 (2006.01) E21B 43/017 (2006.01)

Patent

CA 1038634

APPLICATION FOR UNITED STATES PATENT SUBSEA STRUCTURE AND METHOD FOR INSTALLING THE STRUCTURE AND RECOVERING THE STRUCTURE FROM THE SEA FLOOR ABSTRACT OF THE DISCLOSURE A structure or template forms a tubular support structure for subsea equipment used in drilling and pro- ducing offshore oil and/or gas wells. The template con- tains 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 circumferentiall members or "ring" also functions as a fender to protect the equipment with- in the template. The template is made negatively buoyant upon launch by flooding the compartment 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 struc- ture 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. - 1 -

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