Redeployable subsea manifold-riser system
AssigneeWoodside Energy Technologies Pty Ltd
InventorsAdrian Armstrong MacMillan, Nigel James Palmer
Life of this patent
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Abstract
A subsea manifold-riser system is redeployed from a first production location to a second production location. A manifold module is lowered to the ocean floor at the first production location using a marine riser as a running tool by adding threaded pipe sections to the upper end of the marine riser. The manifold module is raised from the ocean floor at the first production location for redeployment at the second production location using the marine riser as a retrieval tool by removing threaded pipe sections from the upper end of the marine riser.
Claims52
A method for redeployment of a subsea manifold-riser system from a first production location to a second production location, the system comprising:
- a production flow control device for regulating the flow of formation fluids from a subsea well at a first production location;
- a subsea manifold module including connection terminals, the subsea manifold module being positioned in use on the ocean floor adjacent to but spaced apart from the production flow control device;
- a releasable connection means installed between the production flow control device and the connection terminal for delivering formation fluids from the production flow control device to the manifold module;
- and,
- a marine riser comprising a plurality of threaded pipe sections for delivering formation fluids from the manifold module to a floating production facility, the marine riser having an upper end and a lower end;
- and,
- a coupling means for coupling the subsea manifold module to the lower end of the marine riser in a sealing manner;
- the method comprising the steps of:
- a) lowering the manifold module to the ocean floor at the first production location using the marine riser as a running tool by adding threaded pipe sections to the upper end of the marine riser;
- and,
- b) raising the manifold module from the ocean floor at the first production location for redeployment at a second production location using the marine riser as a retrieval tool by removing threaded pipe sections from the upper end of the marine riser.
A redeployable subsea manifold-riser system comprising:
- a production flow control device for regulating the flow of formation fluids from a subsea well at a first production location;
- a subsea manifold module including a manifold and a connection terminal, the subsea manifold module being positioned in use on the ocean floor, adjacent to but spaced apart from the production flow control device;
- a releasable connection means installed between the production flow control device and the connection terminal for delivering formation fluids from the production flow control device to the manifold module;
- a marine riser comprising a plurality of threaded pipe sections for delivering formation fluids from the manifold module to a floating production facility, the marine riser having an upper end and a lower end;
- a coupling means for coupling the subsea manifold module to the lower end of the marine riser in a sealing manner;
- wherein, in use, the manifold module is lowered to the ocean floor at the first production location using the marine riser as a running tool by adding threaded pipe sections to the upper end of the marine riser;
- and, the manifold module is raised from the ocean floor at the first production location for redeployment at a second production location using the marine riser as a retrieval tool by removing threaded pipe sections from the upper end of the marine riser.
Dependencies are inferred from the claim text.