Milling apparatus and method for well casing

Details Milling apparatus and method for well casing Milling apparatus and method for well casing

E - Fixed Constructions

21

B

E21B 43/112 (2006.01) E21B 7/06 (2006.01) E21B 7/18 (2006.01) E21B 43/26 (2006.01)

Patent

CA 2184888

A well penetrator (48) consists of a number of hydraulic fluid control components (54) and a carriage (250) carrying a hydraulic motor (270) and a mill bit (268) supported in a housing (74) which is moveable down a well casing (42). The control components (54) cause the carriage (250) carrying the mill bit (268) to be indexed up a predetermined distance relative to the well casing (42) and then extended gradually into contact with the well casing (42) while being rotated by the hydraulic motor (270). After the mill bit (268) completes a hole through the well casing (42), the hydraulic components (54) index the mill bit (268) back down to its starting position and align a nozzle (N) on the outer end of a high pressure lance (L) with the opening in the casing (42) to direct fluid from the nozzle (N) as the lance (L) is moved outwardly through the hole in the casing (42) drilled by the mill bit (268).

Un pénétrateur (48) d'un puits consiste en un certain nombre de composants (54) de régulation d'un fluide hydraulique et en un chariot (250) portant un moteur hydraulique (270) et une fraise (268) supportée dans un logement (74) que l'on peut descendre dans un cuvelage (42) d'un puits. Les composants de régulation (54) font remonter le chariot (250) portant la fraise (268) d'une distance prédéterminée par rapport au cuvelage (42) du puits et progressivement, il le mettent en contact avec le cuvelage (42) tout en tournant au moyen du moteur hydraulique (270). Une fois le trou percé au travers du cuvelage (42) du puits par la fraise (268), les composants hydrauliques (54) repositionnent la fraise (268) en la redescendant à sa position de départ et alignent un ajutage (N) sur l'extrémité extérieure d'une lance haute pression (L) avec l'ouverture pratiquée dans le cuvelage (42) afin d'envoyer un fluide sortant de l'ajutage (N) en déplaçant vers l'extérieur la lance (L) à travers le trou percé par la fraise (268) dans le cuvelage (42).

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