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US 8,985,220 B2Granted
Well intervention system
AssigneeEnovate Systems Limited
InventorJeffrey Charles Edwards
Life of this patent
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Abstract
A well intervention system is described which has a riser access drive adapted to be located below a vessel, or a rig, work floor. The riser is tensioned and extends from a subsea wellhead to the access device which, in use, is attached to the riser at the location below the work floor. Embodiments of the invention are described.
Claims40
A well intervention system for intervening in a subsea well, the well intervention system comprising:
- a riser access device adapted to be located below a vessel work floor;
- a riser adapted to extend from a subsea wellhead to the access device;
- and
- at least one tensioning device for tensioning the riser wherein, in use, the at least one tensioning device extends from a vessel and is attached to the riser;
- and
- at least one flexible member in fluid communication with the riser, the at least one flexible member adapted to extend from the riser access device to the vessel, such that deviation of the vessel from directly above the subsea wellhead results in a minimal bending moment being applied to the riser,
- wherein, in use, the riser access device is attached to the riser at a location below the vessel work floor.
4 more elements
A method of intervening in a well, the method comprising the steps of:
- attaching a tensioned riser suspended from a vessel to a subsea wellhead, wherein the riser is tensioned by at least one tensioning device extending, in use, from the vessel and being attached to the riser;
- and
- accessing the top of the riser through a riser access device located below a work floor of the vessel, wherein at least one flexible member is adapted to extend from the riser access device to the vessel, the at least one flexible member being in fluid communication with the riser, such that deviation of the vessel from directly above the subsea wellhead results in a minimal bending moment being applied to the riser.
A well intervention system for intervening in a subsea well, the well intervention system comprising:
- a riser access device;
- a tensioned riser adapted to extend from a subsea wellhead to the access device;
- a vessel having a vessel work floor;
- and
- at least one tensioning device for tensioning the riser wherein, in use, the at least one tensioning device extends from the vessel and is attached to the riser;
- and
- at least one flexible member in fluid communication with the riser, the at least one flexible member adapted to extend from the riser access device to the vessel, such that deviation of the vessel from directly above the subsea wellhead results in a minimal bending moment being applied to the riser,
- wherein the riser access device is attached to the riser a location below the vessel work floor.
5 more elements
Dependencies are inferred from the claim text.