초록 ▼

An installation for producing oil from an off-shore deposit has a semi-submersible platform, at least one riser connecting the platform to the sea bed, and devices for tensioning the riser. The tensioning devices include, for each riser, at least one submerged float connected to a point on the main

An installation for producing oil from an off-shore deposit has a semi-submersible platform, at least one riser connecting the platform to the sea bed, and devices for tensioning the riser. The tensioning devices include, for each riser, at least one submerged float connected to a point on the main run of the riser for hauling it towards the surface, and a mechanism for hauling the riser. The mechanism is installed on the platform and applied to the top end of the riser.

대표청구항 ▼

1. An installation comprising:a semi-submersible platform; at least one riser having a main run, said at least one riser being operable to connect said semi-submersible platform to a sea bed; at least one submersible float connected to said main run of said at least one riser, said at least one subm

1. An installation comprising:a semi-submersible platform; at least one riser having a main run, said at least one riser being operable to connect said semi-submersible platform to a sea bed; at least one submersible float connected to said main run of said at least one riser, said at least one submersible float being operable to haul said at least one riser towards a surface of a sea; a hauling mechanism located on said semi-submersible platform and connected to said at least one riser, said hauling mechanism being operable to haul said at least one riser; and at least one releasable latch being operable to bring said at least one submersible float into abutment against said semi-submersible platform in an upward direction, and to release said at least one submersible float from the abutment wherein said at least one submersible float and said hauling mechanism are operable to tension said at least one riser via hauling.