Co-linear tensioner and methods of installing and removing same

Details Co-linear tensioner and methods of installing and removing same Co-linear tensioner and methods of installing and removing same

2006-07-14

2008-03-04

Beach, Thomas A (Department: 3671)

Wells

Submerged well

Means removably connected to permanent well structure

C166S359000, C166S367000

Reexamination Certificate

active

07337849

ABSTRACT:
The invention is directed to a tensioner for providing linear and angular movement of a drilling or production facility relative to a conduit or riser secured to the tensioner and to the wellhead in offshore operations. The tensioner compensates for vessel motion induced by wave action and heave and maintains a variable tension to the riser string alleviating the potential for compression and thus buckling or failure of the riser string. The tensioner of the present invention preferably includes at least one top load plate that facilitates easy and quick installation and removal of the tensioner from the rig floor of the vessel or platform. The tensioner also facilitates the placement of at least one piece of equipment disposed within the area formed by the tensioning cylinders. The tensioner may also include one or more pieces of equipment, e.g., a rotary table, integrally formed with the tensioner to further increase the ease and speed of installation and removal of the tensioner from the rig floor. Methods for installing and removing tensioners from the rig floor are also disclosed.

REFERENCES:
patent: 4808035 (1989-02-01), Stanton et al.
patent: 5658095 (1997-08-01), Arlt et al.
patent: 5846028 (1998-12-01), Thory
patent: 6554072 (2003-04-01), Mournian et al.
patent: 6585455 (2003-07-01), Petersen et al.
patent: 2005/0074296 (2005-04-01), McCarty et al.
patent: 2006/0016605 (2006-01-01), Coles
patent: 2006/0151176 (2006-07-01), Moe

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