Hydraulic and earth engineering – Marine structure or fabrication thereof – With work deck vertically adjustable relative to floor
Patent
1998-02-06
1999-11-02
Taylor, Dennis L.
Hydraulic and earth engineering
Marine structure or fabrication thereof
With work deck vertically adjustable relative to floor
3645281, 405196, E21B 712, E02B 1708
Patent
active
059758058
ABSTRACT:
A method and apparatus of raising or lowering an oil drilling rig mounted on a platform is provided. The rig is mounted on the platform hull, which is supported by a plurality of legs. Each leg has a plurality of jacking chords. The legs are raised or lowered relative to the hull to lower or raise the rig. The elevation of each chord of a leg is measured during the raising or lowering action, and the measured elevations are used to determine the deformation of the leg. In this manner, a corrective action is instituted according to the determined deformation by acting individually on each chord of the leg.
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patent: 4482272 (1984-11-01), Colin
patent: 4813814 (1989-03-01), Shibuta et al.
patent: 4885698 (1989-12-01), Kawasaki
patent: 5833396 (1998-11-01), Thomas
Morvan Pierre
Sananikone Prasert
Christian Steven L.
Kanak Wayne I.
Lee Peter Y.
Schlumberger Technology Corporation
Taylor Dennis L.
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