Drilling fluid circulation system and method

E - Fixed Constructions – 21 – B

Patent

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E21B 21/08 (2006.01) E21B 21/00 (2006.01)

Patent

CA 2506917

The present invention provides drilling systems for drilling wellbores. The drilling system includes an umbilical that passes through a wellhead and carries a drill bit. A drilling fluid system (18) supplies drilling fluid into an annulus (35) (supply line) between the umbilical and the wellbore, which discharges at the drill bit bottom and returns to the wellhead through the umbilical (return line) (24) carrying the drill cuttings. A fluid circulation device (30), such as a turbine or centrifugal pump, is operated in the return line to provide the primary motive force for circulating drilling fluid through a fluid circuit formed by the supply line (22) and return line (24). Optionally, a secondary fluid circulation device in fluid communication with the return line can cooperate with the fluid circulation device to circulate drilling fluid and/or a near bit fluid circulation device can be used to provide localized flow control or suction pressure to improve bit cleaning.

La présente invention concerne des systèmes de forage permettant le forage de puits. Le système de forage comporte un câble ombilical traversant la tête de puits et portant un trépan. Le système de boue de forage (18) achemine la boue de forage dans un espace annulaire (35) (conduite d'alimentation) entre le câble ombilical et le puits, qui décharge au niveau du fond du trépan et retourne vers la tête de puits à travers le câble ombilical (conduite de retour) (24) portant les déblais de forage. Un dispositif de circulation de boue (30), notamment une turbine ou une pompe centrifuge, est mise en marche dans la conduite de retour afin d'exercer une force motrice primaire permettant de faire circuler la boue de forage à travers un circuit de boue formé par la conduite l'alimentation (22) et la conduite de retour (24). Selon une variante, on prévoit un dispositif de circulation de boue secondaire en communication par voie fluide avec la conduite de retour apte à coopérer avec le dispositif de circulation de boue afin de faire circuler la boue de forage et/ou un dispositif de circulation de boue de trépan proche que l'on peut utiliser afin d'assurer la commande de l'écoulement localisée ou une pression d'aspiration de manière à améliorer le nettoyage du trépan.

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