| 摘要 |
<p>An offshore tension leg platform having a deck, a hull, and a plurality of elongate tendons securing the hull to an ocean floor foundation provides full well workover and production capabilities for autonomous operation and can be installed and operated in any water depth and sustains any environmental loading conditions. The hull supports well risers of well trees located below the water surface at an elevation in close proximity to the connections of the tendons to the hull. Alternatively the risers and trees may be supported above water by a deck or the trees may be located on the seabed. A workover platform supported by a perimeter trackway on the deck may be positioned over any of the well risers for workover operations. Liquid products may be exported from the platform via a pipeline or to a floating tanker. The hull is configured to minimize loadings in the tendons. All components are installed by a drilling vessel without the need for special installation vessels and equipment. The tendons are arranged in groups offset from the hull body to resist platform overturning loadings, and to reduce the tendons pretension required to prevent platform pitch and roll motions. The wells are drilled prior to installation of the hull using a drilling vessel. After installation of the platform, all operations required on the wells are performed autonomously from the platform and additional wells can be drilled by offsetting the platform and locating a floating drilling rig over the well to be drilled.</p> |
