| 摘要 |
There is described a method of elevating at least one section of a derrick and a related method of lowering the section, a method of installing a rig or a derrick and a related method of disassembly, and related apparatus. In various embodiments, a carrier comprising lifting devices in the form of hydraulic actuators may be provided and then positioned in a substructure below a drilling deck with sections of the derrick placed upon the carrier. The sections of the derrick may then be moved upward using the hydraulic actuators on paths adapted to limit lateral movement of the sections, whilst locking devices on the drilling deck may be applied so as to allow the sections of the derrick to be locked relative to the substructure against downward movement. |
