SICHERUNGSVERFAHREN EINER UNTERWASSERLEITUNG ZUR VERBINDUNG VON MEEERESBODEN UND PRODUKTIONSOBERFLÄCHE BEI DER WIEDERAUFNAHME DER PRODUKTION

摘要

The invention relates to a method for restarting the production of a subsea bottom-surface production line (1) comprising a first pipe portion (1-1) lying on the bottom of the sea (16) for a wellhead (17) to the lower end (1-2a) of a second pipe portion (1-2) rising to a floating vessel or support (10) at the surface, wherein when the production is stopped, at least said first pipe portion is filled with a depressurized production fluid, characterized in that the following restarting steps are carried out in which: e1) a gel is formed from two reactants in a first gel-forming chamber (5a) at the seabed, said first chamber (5a) communicating with the end (1-1a) of the first portion of pipe (1-1) closest to the wellhead (17), and e2) sending a quantity of said separation gel into the first pipe portion (1-1) pushing the cold fluid contained in the first pipe portion (1-1) towards the second pipe portion (1-2), before closing said first chamber (5a), then e3) production is started, said gel forming a physical separation and thermal and chemical insulation between the production fluid and a production fluid within said first production line portion (1-1).