Method of riser deployment on a subsea wellhead

Details Method of riser deployment on a subsea wellhead Method of riser deployment on a subsea wellhead

E - Fixed Constructions

21

B

E21B 17/01 (2006.01)

Patent

CA 2655231

The riser assembly (14) is plugged adjacent its bottom (20) end either as it is made up or after full makeup or anywhere in between. A heavy fluid (26) is either added to the riser string as it is made up or delivered into the string after makeup to displace seawater or other fluids that may have been in the riser as it is assembled. The floating rig (10) can be secured over the subsea well head (12) and the riser now full of heavy fluid is less prone to be displaced by wave action and preferably simply dangles straight down so that the connection to the subsea wellhead can be simply accomplished. The effect of wave action is minimized or eliminated when deciding placement of the floating rig with respect to the wellhead. Repositioning of the rig takes less effort and is needed less frequently.

Selon l'invention, un ensemble colonne montante (14) est bouché à proximité de son extrémité inférieure (20) au cours de son assemblage, une fois complètement assemblé, ou à un stade intermédiaire quelconque. Un fluide lourd (26) est soit ajouté à la colonne montante au cours de son assemblage, soit injecté dans la colonne montante après son assemblage afin d'évacuer l'eau de mer ou d'autres fluides éventuellement présents dans la colonne montante au cours de son assemblage. Une structure de forage flottante (10) peut alors être fixée sur la tête de puits sous-marine (12). La colonne montante remplie de fluide lourd est moins sensible à l'effet de la houle et pend simplement à la verticale ce qui simplifie son raccordement à la tête de puits sous-marine. L'effet de la houle affecte peu ou pas le positionnement de la structure de forage flottante par rapport à la tête de puits. Le repositionnement de la structure de forage flottante est donc moins fréquent et plus facile à réaliser.

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