Patent ID: 9732596
Date: 2017-08-15
CPC Classifications: E21B,F16L

Claim:
1. A method of commissioning at least one subsea hydrocarbon well terminating by a wellhead, from a petroleum drilling rig, wherein said method comprises: screwing double-walled pipe segments together in mutual succession to form a thermally insulated floor-to-surface link pipe comprising an inner pipe for transporting hydrocarbons, and an outer pipe, wherein a thermally insulating material is disposed between said inner and outer pipes; connecting said floor-to-surface link pipe to said wellhead; and extracting the hydrocarbons via said floor-to-surface link pipe to said drilling rig on the surface, wherein each of said double-walled pipe segments comprises: a single-walled connection and transport inner metal pipe, resistant to open-sea stresses and provided with first and second threaded reinforced ends; a female metal bayonet-piece disposed around said first threaded reinforced end, said female bayonet-piece comprising a cylindrical portion extended at one end by a narrower portion that is welded or otherwise bonded to a tightening portion of said first threaded reinforced end, and at the other end by a wider portion; a portion of said thermally insulating material disposed around the single-walled connection and said transport inner metal pipe segment and around said female bayonet-piece, an outer metal pipe provided with a narrower portion welded or otherwise bonded to a tightening portion of said second threaded reinforced end; and a metal cover-piece disposed around said female bayonet-piece, said cover-piece having a cylindrical portion welded or otherwise bonded at one end to the wider end portion of the female bayonet-piece, and being extended at the other end by a narrower portion welded or otherwise bonded to said outer pipe; each of said double-walled pipe segments being arranged in such a manner that tightening torque can be applied for screwing two adjacent double-walled pipe segments together by tightening tongs applied against said outer metal pipe of each of said two adjacent double-walled pipe segments.