Wellbore circulation system

E - Fixed Constructions – 21 – B

Patent

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Details

E21B 3/04 (2006.01) B25B 13/50 (2006.01) E21B 17/00 (2006.01) E21B 19/16 (2006.01) E21B 21/01 (2006.01) E21B 21/10 (2006.01) E21B 33/06 (2006.01)

Patent

CA 2596282

A system (10) for continuously circulating fluid to and through a tubular string either of coiled tubing or made up of a plurality of tubulars connected end-to- end while an upper tubular (32) is added to or removed from a top tubular (26) of the plurality of tubulars, all tubulars having a top-to-bottom fluid flow channel therethrough. The system has an upper chamber (43) with an upper sealing apparatus (34) for sealingly encompassing a portion of the upper tubular, a lower chamber (45) with a lower sealing apparatus (36) for. sealingly encompassing a portion of the top tubular (26), one of the upper chamber and the lower chamber sized for accommodating connection and disconnection therein of the upper tubular and the top tubular, and gate apparatus (60) between and in fluid communication with the upper chamber and the lower chamber.

Système (10) permettant d'assurer la circulation en continu d'un fluide vers et dans un train de tubage fait de tubes spiralés ou de tubulaires bout à bout, pendant qu'un tube supérieur (32) s'ajoute à un tube de dessus (26) parmi les tubulaires ou en est retiré, les tubulaires étant traversés par un canal d'écoulement de fluide allant du haut vers le bas. Le système comporte une chambre supérieure (43) pourvue d'un appareil d'étanchéité supérieur (34) servant à entourer de façon étanche une partie du tube supérieur, une chambre inférieure (45) pourvue d'un appareil d'étanchéité inférieur (36) servant à entourer de façon étanche une partie du tube de dessus (26), les dimensions de la chambre supérieure et de la chambre inférieure permettant la connexion et la déconnexion dans les chambres du tube supérieur et du tube de dessus, et un appareil à vanne (60) entre la chambre supérieure et la chambre intérieure est en communication fluidique avec elles.

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