Methods for installing risers in a fluid injection system
AssigneeHorisont Energi AS
InventorsStåle BRATTEBØ, Bjørgulf HAUKELIDSÆTER EIDESEN
Life of this patent
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Abstract
A riser (171) to be arranged for injecting fluid from a vessel on a water surface (111) into a subterranean void (150) beneath a seabed (130) is attached to a buoy (170) as follows. An ROV (350) is controlled to attach a winch wire (320) to a head end (300) of the riser (171). Then, the ROV (350) is controlled to lead the winch wire (320) via the buoy (170) to a winch unit (330) on a seabed (130) below the buoy (170). Thereafter, the winch unit (330) is controlled to pull up the head end (300) of the riser (171) to a bottom side of the buoy (170). Finally, the ROV (350) is 10 controlled to connect the head end (300) of the riser (171) to a connector arrangement (210) in the bottom of the buoy (170).
Claims6
A method of attaching at least one riser to a buoy, which buoy and at least one riser are to be arranged for injecting fluid from a vessel on a water surface into a subterranean void beneath a seabed, the method comprising:
- controlling a remote operated vehicle to attach a winch wire to a head end of a first riser of the at least one riser,
- controlling the remote operated vehicle to lead the winch wire via the buoy to a winch unit on a seabed below the buoy, controlling the winch unit to pull up the head end of the first riser to a bottom side of the buoy, and
- controlling the remote operated vehicle to connect the head end of the first riser to a first connector arrangement in the bottom of the buoy.
A method of attaching at least one riser to a subsea template on a seabed, which at least one riser is connected to a buoy for receiving fluid from a vessel on a water surface, and which at least one riser is to be arranged for feeding the received fluid to the subsea template for injection into a subterranean void beneath a seabed, the method comprising:
- controlling a remote operated vehicle to steer an emitting end of a base section of a first riser of the at least one riser to a first template guide member on the subsea template,
- controlling the remote operated vehicle to feed the emitting end of the base section of the first riser via the first template guide member to a first sleeve member having first penetration means configured to penetrate the first riser so as to cause the first penetration means to penetrate the first riser in the emitting end of the base section and create a first opening in the first riser, and
- controlling the remote operated vehicle to connect the first sleeve member to a first injection valve tree comprised in the subsea template, which first injection valve tree is in fluid connection with a first wellhead for a drill hole to the subterranean void.
Dependencies are inferred from the claim text.