US2013075102A1PendingUtilityA1

Mobile offshore drilling unit

20
Individually held — no corporate assignee on recordPriority: Mar 29, 2010Filed: Mar 29, 2011Published: Mar 28, 2013
Est. expiryMar 29, 2030(~3.7 yrs left)· nominal 20-yr term from priority
Inventors:Bui V. Dao
B63B 1/107E21B 15/00B63B 35/4413E21B 19/14B63B 2001/128E21B 43/01E21B 7/132B63B 2241/08
20
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Claims

Abstract

A semisubmersible mobile offshore drilling unit (MODU) includes a submersible lower hull comprising a ring pontoon having a trapezoidal shape; an upper hull having the trapezoidal shape; three stability columns supporting the upper hull from the lower hull; and a drilling rig. The MODU may be operated in a tender assist mode or an independent drilling mode. The MODU may be equipped to prepare, drill, and complete a subsea wellbore or to workover an existing subsea wellbore.

Claims

exact text as granted — not AI-modified
1 . A semisubmersible mobile offshore drilling unit (MODU), comprising:
 a submersible lower hull comprising a ring pontoon having a trapezoidal shape;   an upper hull having the trapezoidal shape;   three stability columns supporting the upper hull from the lower hull; and   a drilling rig.   
     
     
         2 . The MODU of  claim 1 , further comprising a crane operable to hoist the drilling rig to a platform for a tender assist mode; and an umbilical for powering the drilling rig from the MODU in the tender assist mode. 
     
     
         3 . The MODU of  claim 1 , further comprising a moonpool, wherein the drilling rig is deployable over the moonpool for a drilling mode. 
     
     
         4 . The MODU of  claim 1 , wherein the MODU is operable to prepare, drill, and complete a subsea wellbore. 
     
     
         5 . The MODU of  claim 1 , wherein the MODU is operable to workover a subsea wellbore.

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