Offshore exploration or production operation

E - Fixed Constructions – 21 – B

Patent

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Details

E21B 43/01 (2006.01) B63B 9/06 (2006.01) E02B 17/02 (2006.01)

Patent

CA 2208976

Apparatus for providing an offshore drilling operation in a sea, the apparatus comprising a drilling derrick support structure (2) having a base (4) to rest on the sea-floor (5) and a deck (7) to support a drilling derrick (1), the structure being in the form of a concrete block (2) having a hollow cavity to enable the block (2) to be floated to the site where drilling is to take place and being adapted to receive ballast into the cavity in such a way and in a sufficient quantity as to cause the block (2) to sink base-first and rest upon the sea-bed with the deck (7) clear of the surface of the sea, a drilling derrick (1) for mounting on the deck (7) of the block (2) and a tender assist barge (3) for transport to the site in down to 2m of water to provide services, supplies and equipement to the drilling derrick (1).___________________________________________________________________________ _______

Appareil destiné à une opération de forage en mer, constitué d'une structure de support de tour de forage (2) présentant une base (4) destinée à reposer sur le fond marin (5), et d'un pont (7) destiné à recevoir une tour de forage (1), cette structure prenant la forme d'un bloc de béton (2) comportant une cavité permettant au bloc (2) d'être acheminé par flottage jusqu'au site où le forage doit avoir lieu. La structure est conçue pour recevoir du ballast dans la cavité de façon appropriée et en quantité suffisante pour que le bloc (2) coule par la base et aille reposer sur le fond marin, le pont (7) restant au-dessus de la surface de la mer. Une tour de forage (1) est montée sur le pont (7) du bloc (2) et une barge annexe (3) assure le transport jusqu'au site, dans une eau d'une profondeur de 2 m au plus, pour apporter des services, fournitures et matériels à la tour de forage (1).

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