초록 ▼

A mobile marine drilling assembly has a horizontally disposed pontoon which floats on or is submerged below the surface of a marine environment. A first vertically disposed column is secured to the pontoon and extends upwardly therefrom. A work platform has an opening through which the column extend

A mobile marine drilling assembly has a horizontally disposed pontoon which floats on or is submerged below the surface of a marine environment. A first vertically disposed column is secured to the pontoon and extends upwardly therefrom. A work platform has an opening through which the column extends, and the platform overlies the pontoon and is vertically movable relative thereto along the column. A jack system is operably connected with the work platform and with the column for jacking the work platform along the column between a first position wherein the pontoon floats on the surface of the marine environment and a second position wherein the pontoon is disposed a substantial distance below the surface of the marine environment. An anchor is secured to the floor of the marine environment. A plurality of resilient tendons extend between and are secured to the pontoon and the anchor, and the tendons are under tension when the pontoon is in the second position so that wave and current induced horizontal movement of the pontoon and thereby of the column and the work platform is permitted, and vertical movement is resisted.

대표청구항 ▼

A mobile marine platform for operating at a deepwater site, comprising: (a) horizontally disposed pontoon means for floating on or being submerged below the surface of a marine environment; (b) at least a first vertically disposed column secured to said pontoon means and extending upwardly therefrom

A mobile marine platform for operating at a deepwater site, comprising: (a) horizontally disposed pontoon means for floating on or being submerged below the surface of a marine environment; (b) at least a first vertically disposed column secured to said pontoon means and extending upwardly therefrom; (c) a work platform having at least a first opening through which said column extends, said work platform overlying said pontoon means and vertically movable relative thereto along said column; (d) jack means operably associated with said work platform and with said column for jacking said work platform relative to said column between a first position wherein said pontoon means and said work platform float on the marine environment while the platform is being moved to a site and a second position wherein said work platform is disposed above the surface of the marine environment and said pontoon means and a portion of said column are disposed below the surface of the marine environment; (e) anchor means for being secured to the floor of the marine environment; (f) a plurality of resilient tendons for extending between said pontoon means and said anchor means, said tendons for being under tension when said pontoon means and said column portion are below the surface of the marine environment so that wave and current induced horizontal movement of said pontoon means and thereby of said column and work platform is permitted and upward and angular movement thereof is resisted; and (g) said work platform being buoyant for providing with said pontoon means stability to the platform in the marine environment while the platform is being moved to the site, thereby permitting said column and said pontoon means to be sized so that stress on said tendons induced by wave action at the site is reduced.