E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
E21B 21/08 (2006.01)
Patent
CA 2540880
A method and device for controling drilling fluid pressure during subsea drilling, where drilling fluid is pumped down into a borehole (15) and then flows back to a drilling rig (1) via the lined and/or unlined sections of the borehole (15) and a liner (14), wherein the drilling fluid pressure is controlled by pumping drilling fluid out of the liner (14) at the seabed, and where the liner (14) annulus (30) above the drilling fluid is filled with a riser fluid having a density different from that of the drilling fluid.
L'invention concerne un procédé et un dispositif de régulation de la pression du fluide de forage durant le forage sous-marin, le fluide de forage est pompé hors d'un trou de forage (15), puis refoulé dans une installation de forage (1) via les sections tubées et non tubées du trou de forage (15) et une colonne perdue (14), la pression du fluide de forage étant régulée par pompage du fluide de forage hors de la colonne perdue (14) au niveau du fond marin. L'espace annulaire (30) de la colonne perdue (14) au-dessus du fluide de forage est rempli d'un fluide de colonne montante ayant une densité différente de celle du fluide de forage.
Agr Subsea As
Bereskin & Parr Llp/s.e.n.c.r.l.,s.r.l.
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