E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
166/51.4
E21B 7/12 (2006.01) E21B 7/128 (2006.01) E21B 19/09 (2006.01)
Patent
CA 1095402
Abstract Apparatus for drilling a well at a location submerged below a body of water includes a buoyant foundation structure THE foundation structure is floatable on the surface of the body of water and is subject to vertical motion in response to waves and the like. A riser handling and tensioning mechanism is mounted to the foundation structure and is operable for above a riser pipe along a substantially vertical line from and to the foundation into and out of connection with the submerged location. The riser handling and tensioning mechanism is also operable for applying tension to a riser pipe connected to the sub- merged location. The handling and tensioning mechanism includes vertically disposed hydraulic rams mounted to the foundation structure. Holding means are releasably engageable with a riser pipe adjacent its upper end and are connected to the rams for movement along the riser line by the rams. The rams have an active operating mode in which they are operable to lower and raise a riser pipe along the line into and out of connection of the lower end of the riser with the submerged location. The rams also have passive operating mode in which they are operable to apply a selected upward force to a riser engaged in the holding means and connected to the submerged location during vertical motion of the foundation structure.
315231
Mcnary James F.
Person Abraham
Wetmore Sherman B.
Global Marine Inc.
Hirons & Rogers
LandOfFree
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