A method and apparatus for drilling off a floating structure

E - Fixed Constructions – 21 – B

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E21B 33/08 (2006.01) E21B 7/12 (2006.01) E21B 21/00 (2006.01)

Patent

CA 2363495

A floating rig or structure for drilling in the floor of an ocean using a rotatable tubular includes a seal housing having a rotatable seal connected above a marine riser fixed to the floor of the ocean. The seal rotating with the rotating tubular allows the riser and seal housing to maintain a predetermined pressure in the system that is desirable in underbalanced drilling, gas-liquid mud systems and pressurized mud handling systems. A flexible conduit or hose is used to compensate for the relative movement of the seal housing and the floating structure since the floating structure moves independent of the seal housing. A method for use of the system is also disclosed.

L'invention concerne une tour de forage ou structure flottante permettant de forer le fond d'un océan avec un tube rotatif et comprenant un logement étanche équipé d'un joint d'étanchéité rotatif couplé à un tube conducteur marin en contact avec le fond de l'océan. La rotation simultanée du joint d'étanchéité et du tube permet au tube conducteur marin et au logement étanche de maintenir une pression prédéterminée dans le système, ce qui est souhaitable dans le forage en sous-pression, dans les systèmes de boue gazéifiée liquide et dans les systèmes de manipulation de boue sous pression. On utilise un conduit ou tuyau flexible afin de compenser le mouvement relatif du logement étanche et de la structure flottante puisque le mouvement de cette dernière est indépendant du logement étanche. L'invention concerne également un procédé d'utilisation du système.

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