METHOD FOR SECURING AN UNDERWATER DRIVE FOR PRODUCING THE BOND-SURFACE BOND PRODUCTION AT THE STOPPING OF PRODUCTION

摘要

The invention relates to a process for stopping the production and securing of a subsea bottom-surface production line (1) comprising a first pipe portion (1-1) resting at the bottom of the sea (16) from a wellhead (17) to the lower end (1-2a) of a second conduit portion (1-2) rising to a floating vessel (10) or surface, in which after the production stoppage, a first depressurization of the entire subsurface bottom-surface production line (1) is effected by leaving only a portion of the gas contained in the production contained in said production line (1) evacuate to the surface by its upper end (1-2b), characterized in that it then carries out the following steps in which: a) isolates said first part of pipe of production (1-1) of said second driving part (1-2), and the flu production idea in said first part of production line (1-1), and not in said second part of pipe (1-2) which is drained, and b) further depressurization of the first part of driving production line (1-1) filled with fluid production, decreasing the pressure in said first pipe portion (1-1) and by evacuating more completely the gas contained in the production fluid it contains.