Method and apparatus for displacing drilling fluids with...

E - Fixed Constructions – 21 – B

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E21B 37/02 (2006.01) E21B 21/00 (2006.01) E21B 37/10 (2006.01)

Patent

CA 2374709

The mechanical separation of drilling fluid and a completion fluid by swab cups (86, 88) is used in combination with a casing scraper (90,92) and movement of the tubing (18) to clean up a wellbore. In a first embodiment, reverse circulation is used placing a completion fluid above swab cups (86, 88) and lowering the pipe (18) to displace a drilling fluid. In a second embodiment, in combination with a casing scraper (90, 92), a completion fluid is pumped into an annulus located below swab cups (86, 88) and the drilling fluid is displaced from above the swab cups (86, 88) by raising the tubing (18). Alternately, large swab cups (360, 362) are shearingly secured in combination with smaller swab cups (370, 372) and casing scraper (380) allowing the apparatus to be used with progressively smaller diameter casing (310) during the same operation of the apparatus.

Cette invention concerne la séparation mécanique du fluide de forage et du fluide de complétion au moyen de coupelles de pistonnage (86, 88), utilisée conjointement avec un racleur de tubage (90, 92) et le mouvement du tube (18) pour nettoyer un puits de forage. Selon un premier mode de réalisation, on utilise une circulation inverse en disposant le liquide de complétion au-dessus des coupelles de pistonnage (86, 88) et en abaissant le tuyau (18) de manière à chasser un fluide de forage. Selon un deuxième mode de réalisation, et conjointement avec un racleur de tubage (90, 92), on pompe un fluide de complétion dans un espace annulaire situé au-dessous des coupelles de pistonnage, puis l'on fait passer le liquide de forage sous les coupelles de pistonnage (86, 88) en soulevant le tube (18). En variante, on utilise des coupelles de pistonnage de grande taille (360, 362) montées en cisaillement avec des coupelles plus petites (370, 372) et un racleur de tubage (380), ce qui permet d'utiliser ce dispositif dans un gainage (310) dont le diamètre va en diminuant.

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