System for drilling a wellbore

Details System for drilling a wellbore System for drilling a wellbore

E - Fixed Constructions

21

B

E21B 17/10 (2006.01) C09K 8/08 (2006.01) C09K 8/18 (2006.01) C10M 169/04 (2006.01)

Patent

CA 2686386

A system is provided for drilling a borehole into an earth formation, comprising a casing arranged in the borehole, a drill string extending through the interior of the casing to a lower end portion of the borehole, and a body of drilling fluid extending into the casing, the casing having an inner surface susceptible of wear due to frictional contact with an outer surface of the drill string during drilling of the borehole with the drill string. The system further comprises means for reducing wear of said inner surface of the casing, said means including at least one of a hardened layer at the inner surface of the casing, a friction-reducing layer at the outer surface of the drill string, and a lubricating compound contained in the body of drilling fluid.

La présente invention concerne un système de forage d'un trou de forage dans une formation géologique, comportant un tubage installé dans le trou de forage, un train de tiges s'étendant à travers l'intérieur du tubage jusqu'à une partie d'extrémité inférieure du trou de forage, e tun corps de fluide de forage s'étendant dans le tubage, le tubage présentant une surface interne susceptible d'usure due au contact de frottement avec une surface externe du train de tiges de forage lors du forage du trou de forage avec le train de tiges de forage. Le système comporte également un moyen permettant la réduction d'usure de ladite surface interne du tubage, ledit moyen comprenant au moins une couche durcie à la surface interne du tubage, une couche de réduction de frottement à la surface externe du train de tiges de forage, et un composé lubrifiant contenu dans le corps du fluide de forage.

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