Odeco, Inc.

Nippon Kokan K.k.

Ocean Drilling & Exploration Company

Odeco Engineers Inc.

Carmon R Costello

Terry D Petty

Kun K Song

Luc G Chabot

Tadahiro Fujita

David Gansar

Haruki Hirose

Ray A Smith

Gude P Rao

Nobutoshi Yoshimura

A cantilevered jack-up rig having a support for supporting the free ends of the rig's cantilever beams when said beams are extended over a platform to be serviced by the rig, thereby maximizing the lateral reach of the rig and increasing the load capacity at the maximized reach. The support is positioned between the top of the platform and the bottoms of the extended cantilever beams. The top of the support is provided with a motion block to facilitate lateral and rotational motion of the extended cantilever beams relative to the support.

Apparatus and method for supporting the free end of a cantilever beam of

The semi-submersible platform comprises a submersible lower hull including a plurality of spaced-apart hull segments. A wave-transparent stabilizing superstructure extends from the lower hull. An upper hull is supported by the superstructure. A wellhead system is suspended from the platform. A catenary mooring system moors the platform to the seabed, and plurality of risers connect the individual wellheads on the platform to the wellbores in the seabed.

Column stabilized platform with improved heave motion

The mobile marine drilling structure is of the submersible type for operation in ice-covered waters. The structure comprises a base for placing the structure on the sea bed, a hull extends from the base, and a deck is supported by the hull. The deck is located above the water line for conducting drilling operations. The hull has an internal frame assembly including ballast tanks, and external wall sections at different inclinations to the horizontal to engage and break up the moving ice masses encroaching on the hull. These external wall sections include a plurality of matching polygonal, frusto-pyramidal, apex-up and apex-down walls extending above the base, and two transitional wall sections to provide two inflection points to the hull.

Deep water mobile submersible arctic structure

The method involves erecting a very large-diameter column from a plurality of buoyant columnar members at a selected site in a body of sea water. Each columnar member is floated erect to the site. The first or lowermost columnar member is pulled down and fully submerged to a predetermined depth over the site. The second columnar member is then positioned directly over the lowermost member. The lowermost member is allowed to move up and lift the second member out of the water. The two columnar members are securely interconnected to each other in a watertight fashion. The partial column is then pulled down to a fully submerged condition and the third columnar member is positioned directly over the second member. The partial column is allowed to move up and lift the third member out of the water. A secure watertight connection is made between the third columnar member and the second columnar member. This process of erection is repeated for as many columnar members as may be required to obtain the full length for the desired column. The pulling down of the columnar members can be effected by winches mounted on a platform. The winches have lines on which anchor weights are suspended. The weights are disposed on the sea bed in a suitable pattern around the selected site. The lifting of the columnar members is effected by the inherent buoyancy of the columnar members.

Method of erecting a very large diameter offshore column

Growing community of inventors

Kenner, LA, United States of America

Carmon R Costello