E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
E21B 23/04 (2006.01) E21B 17/06 (2006.01) E21B 34/10 (2006.01)
Patent
CA 2733793
The controller comprises housing (2) within which located is an inner mandrel (4), which is biased in an upward direction by spring (16). Balls (10) in ducts (8) are locking the inner mandrel to housing (2). At a lower end of mandrel (4) are a plurality of ports (18) which may be aligned with a set of outer ports (22). When ports (18) are to be aligned with ports (22), the drill string is rotated, generating a centrifugal force which forces balls (10) radially along ducts (8), thereby unlocking inner mandrel from outer housing. Pressure is then applied to inner duct (7), creating a pressure difference across choke (6). Under sufficient pressure, the force created is sufficient to overcome the resistive force created by spring (16), and thus the inner mandrel translates axially to bring ports (18) in alignment with ports (22), through which some or all of the drilling fluid may flow, by-passing the rest of the drill string.
Linvention concerne un module de commande (3) destiné à commuter des modes de fonctionnement dun outil de fond (1) ainsi quun procédé de commande dun outil de fond (1). Le module de commande (3) comprend : un dispositif de commutation conçu pour commuter entre une pluralité de modes de fonctionnement; et un dispositif de détection conçu pour détecter une pluralité de paramètres dentrée. Le dispositif de commutation commute dun premier des modes de fonctionnement à un deuxième des modes de fonctionnement lorsque le dispositif de détection détecte un état prédéfini dau moins deux des paramètres dentrée.
Macrae & Co.
Pilot Drilling Control Limited
LandOfFree
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