Patent ID: 6601649
Filing Date: 2003-08-05
Classification: B63B,E21B

Abstract:
A semisubmersible multipurpose unit (MPU) adapted for use in wellhead surface operations comprising:a. a deck, a plurality of supports having a rounded shape connected to said deck, a plurality of pontoons connected to said plurality of supports, each of said plurality of pontoons adapted for ballast transfer, at least two hawsers connected to the MPU for connecting the MPU to an object at sea having a mooring system, a hawser guidance system to direct each of said hawsers to the object at sea; b. a crane removably secured to said deck; c. a multipurpose tower (MPT) removably secured to said deck wherein said MPT comprises a base structure mounted in said deck, a central tower mounted to said base structure, a top drive mounted to said central tower, a drawworks secured to said central tower; and a driller's cabin module mounted in said deck connected to said base structure, and d. an at least 6-point mooring system; wherein the combination of said semisubmersible MPU, said at least two hawsers and said at least 6-point mooring system create a global equilibrium between the mooring system of an object at sea and the said at least 6-point mooring system.