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US 10,240,400 B1Granted
Mini-riser for SCR coiled tubing and wireline interventions
OwnerKrzysztof Jan Wajnikonisinventor
Life of this patent
Estimating the term…
Abstract
A novel configuration of lightly tensioned or substantially untensioned, i.e. substantially compliant mini-riser is provided to facilitate coiled tubing and/or wireline interventions in rigid catenary riser installations. Those can include in particular clearing hydrates that may accidentally plug risers or subsea pipelines connected to those risers. Existing Intervention Y units can be used, or they can be modified to suit design condition of particular installations. The mini-riser can be used with flexible joint hang-offs, Titanium Stress Joint hang-offs or with novel Spoolflex hang-offs.
Claims18
A riser assembly comprising:
- an Intervention ‘Y’ fitting designed for coiled tubing or wireline operations,
- a mini-riser connected by a lower end of said mini-riser to a service flange of said Intervention ‘Y’ fitting designed for said coiled tubing or said wireline operations,
- said Intervention ‘Y’ fitting designed for said coiled tubing or said wireline operations being installed in a general area of and connected to a top of a riser including at least one of a rigid catenary riser, or a metallic catenary riser, or a steel catenary riser, or a steel lazy wave riser, or a titanium catenary riser, or a Chinese lantern riser, or a bottom weighed riser, or a fiber reinforced plastic catenary riser, or a fiber reinforced plastic lazy wave riser;
- wherein said mini-riser is connected above a water surface by an upper end of said mini-riser to a servicing deck attached to at least one of a platform, or a spread moored vessel, or a turret moored vessel, or a disconnectable turret vessel, or an offshore support vessel, or a diving support vessel, or a multipurpose support vessel, or a barge, or a floating buoy, or a submerged buoy,
- and wherein said mini-riser is substantially compliant between said upper end of said mini-riser and said lower end of said mini-riser.
2 more elements
Dependencies are inferred from the claim text.