Method and system for return of drilling fluid

Details Method and system for return of drilling fluid Method and system for return of drilling fluid

E - Fixed Constructions

21

B

E21B 21/08 (2006.01)

Patent

CA 2576053

A system and method is described for use and return of drilling fluid/cuttings from a well, which is drilled on the ocean floor, in connection with offshore related oil production and gas production, where, from a drilling rig or drilling vessel (10), a drill stem (12) runs down into the bore hole and where a blowout preventer (BOP) is placed on said well, without mounting a riser between the rig or the vessel and said blowout preventer. A sealing and pressure-regulating device (16) is arranged on the blowout preventer (14) arranged to regulate the level of the drilling fluid, and thus the outlet pressure of the drilling fluid in said sealing and pressure-regulating device, and a pump module (18) is set up at a suitable distance adjacent said sealing and pressure-regulating device, where the pump module is arranged to pump said drilling fluid up to the ocean surface via an external return pipe.

L'invention concerne un système et un procédé permettant l'utilisation et le retour du liquide de forage/déblais de forage à partir d'un puits, lequel est foré dans le fond océanique, en relation avec la production de pétrole et de gaz en mer. Selon ce système et ce procédé, à partir d'une installation de forage ou d'un vaisseau de forage (10), une colonne de forage (12) passe dans le trou de forage et un bloc obturateur de puits (BOP) est placé sur le puits, sans qu'un tube prolongateur ne soit monté entre le vaisseau ou l'installation et le bloc obturateur de puits. Un dispositif d'étanchéité et de régulation de la pression (16) est placé sur le bloc obturateur de puits (14) afin de réguler le niveau de fluide de forage, et ainsi la pression de sortie du fluide de forage dans ce dispositif d'étanchéité et de régulation de la pression. Un module de pompe (18) est placé à une distance convenable adjacent au dispositif d'étanchéité et de régulation de la pression, ce module de pompe étant destiné à pomper le liquide de forage jusqu'à la surface de l'océan par l'intermédiaire d'une colonne de retour extérieure.

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