Dispersive riserless drilling fluid

Details Dispersive riserless drilling fluid Dispersive riserless drilling fluid

C - Chemistry, Metallurgy

09

K

C09K 8/16 (2006.01) E21B 7/12 (2006.01) E21B 7/20 (2006.01)

Patent

CA 2649574

A method for drilling riserless that includes providing a drilling fluid to a drilling assembly for drilling a borehole on a seafloor, the drilling assembly comprising a drill string and a bottomhole assembly, and wherein the drilling fluid includes a brine, and a non-hydratable clay, wherein the drilling fluid is substantially free of hydrating clays, and flowing the drilling fluid and cuttings through an annulus formed by the drill string and the borehole into sea water is disclosed.

L'invention concerne une méthode de forage sans tube prolongateur qui consiste à fournir un fluide de forage à un assemblage de forage permettant de réaliser un forage sur un fond océanique, l'assemblage de forage comprenant un train de tiges de forage et un assemblage de fond de puits, le fluide de forage étant constitué d'une saumure et d'une argile non-sensible à l'hydratation et en majorité sans argile sensible à l'hydratation, ainsi qu'évacuer le fluide de forage et les déblais de forage dans l'espace annulaire formé par le train de tiges de forage et le forage vers l'eau de mer.

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