Well intervention monohull vessel

Abstract

A well intervention monohull vessel and method of use including a tower type open derrick structure disposed on a deck of the vessel and a sole point land out having a sole point of riser tension contact with a top of the derrick structure. The vessel may also include subsea equipment such as an intervention riser system and an emergency disconnect package, a moon pool door preferably capable of transporting the subsea equipment, an intervention lift frame, a surface coiled tubing reel, a riser storage area, a rail, a pallet, a subsea tree, a crane, and/or drawworks.

What is claimed is: 
     
         1 . A well intervention monohull vessel, wherein the vessel has a deck, comprising:
 a tower type open derrick structure disposed on the deck; and   a sole point land out having a sole point of a riser tension contact with a top of the derrick structure; and   a moon pool door capable of being flush with the deck, wherein the moon pool door is capable of serving as a drill floor of the vessel.   
     
     
         2 . The vessel of  claim 1  wherein the moon pool door is capable of running at least one subsea equipment and transporting at least one subsea equipment. 
     
     
         3 . The vessel of  claim 1 , wherein the moon pool door comprises a power slip. 
     
     
         4 . The vessel of  claim 2  wherein the subsea equipment comprises:
 an intervention riser system; and 
 an emergency disconnect package. 
 
     
     
         5 . The vessel of  claim 2 , wherein the sole point land out is capable of interacting with the subsea equipment. 
     
     
         4 . The vessel of  claim 1 , wherein the sole point land out is capable of interacting with well intervention equipment. 
     
     
         6 . The vessel of  claim 1  further comprising an intervention lift frame. 
     
     
         7 . The vessel of  claim 1  further comprising at least one surface coiled tubing reel disposed on the deck. 
     
     
         8 . The vessel of  claim 1  further comprising at least one riser storage area. 
     
     
         9 . The vessel of  claim 1  further comprising:
 at least one rail; and 
 at least one pallet. 
 
     
     
         10 . The vessel of  claim 1  further comprising at least one subsea tree. 
     
     
         11 . The vessel of  claim 1  further comprising at least one crane disposed on the deck. 
     
     
         12 . The vessel of  claim 1  comprising at least one drawworks in connection with the sole point land out. 
     
     
         13 . A method of using a monohull vessel, wherein the vessel has a deck, comprising the steps of:
 (a) placing a tower type open derrick on the deck;   (b) drawing a sole point land out having a sole point of a riser tension contact with a top of the derrick structure; and   (c) installing a moon pool door capable of being flush with the deck, wherein the moon pool door is capable of serving as a drill floor of the vessel.   
     
     
         14 . The method of  claim 13  further comprising the steps of:
 (d) disposing at least one subsea equipment via the sole point land out. 
 
     
     
         15 . The method of  claim 14  wherein the subsea equipment comprises an intervention riser system and an emergency disconnect package. 
     
     
         16 . The method of  claim 13  wherein the moon pool door in step (c) is capable of:
 (i) running at least one subsea equipment; and 
 (ii) transporting at least one subsea equipment. 
 
     
     
         17 . The method of  claim 16 , wherein the moon pool door comprises a power slip and the step of running the at least one subsea equipment further comprises activating the power slip.