| 摘要 |
A jack-up conical structure having a generally cone shape. The wide base and narrow upper section enhance stability of the structure during floatation, transport, elevation, anchoring, and drilling. The wide base along with a buoyant portion provide a large water line area which enhances stability of the structure during floatation and transit and while sections of the structure elevate and lower. The wide base also has shear resistance portion that prevents lateral sliding, especially in ice infested waters. A central shaft is disposed in a vertical orientation to the structure and facilitates movement throughout. A conical upper portion moves along the central shaft relative to the conical base. A drilling portion moves on racks of grooves inside the central shaft and performs drilling operations. Numerous chambers, cranes, and helipad support drilling and habitation on the structure. |
| 主权项 |
1: A structure comprising:
a central shaft, said central shaft being disposed in a substantially vertical orientation; a conical base, said conical base comprising a generally conical shape, said conical base further comprising a shear resistance portion, said shear resistance portion being configured to help increase the resistance of said structure against lateral displacement; a conical upper portion, said conical upper portion comprising a generally conical shape, said conical upper portion being configured for displacement along the longitudinal axis of said central shaft relative to said conical base, said conical upper portion further comprising a buoyant portion, said buoyant portion being configured to help stabilize said structure during floatation; an outer jacking portion, said outer jacking portion being configured to displace said conical upper portion; a drilling portion, said drilling portion being configured for displacement along said longitudinal axis of said central shaft relative to said conical base and relative to said conical upper portion, said drilling portion further being configured to perform substantially drilling operations beneath said structure while said structure anchors; and an inner jacking portion, said inner jacking portion being configured to displace said drilling portion. |
