Lockable motor assembly for use in a well bore

Details Lockable motor assembly for use in a well bore Lockable motor assembly for use in a well bore

E - Fixed Constructions

21

B

E21B 4/02 (2006.01) E21B 7/06 (2006.01)

Patent

CA 2380219

A lockable motor assembly (1) for use in a well bore comprises a PDM motor (2) having a rotor (4) and a stator (3). A locking member (12) has a splined projection (13) which is received within a splined recess (14) of the rotor and external splines (15) which mate with splines provided on a sub (5) connected to the stator. The components are held in this configuration by a shear ring (23) until the fluid pressure within a chamber (28) defined between the locking member (12) and the sub (5) is sufficient to cause the shear ring to shear. The locking member (12) may then move out of the engagement with the rotor to free the motor for operation. The locking member is held in this position by a ratchet mechanism (35).

L'invention concerne un ensemble (1) moteur verrouillable destiné à s'utiliser dans un puits de forage et comprenant un moteur (2) volumétrique qui comporte un rotor (4) et un stator (3). Un élément (12) de verrouillage présente une saillie (13) cannelée qui se loge dans un creux (14) cannelé du rotor et des cannelures (15) extérieures s'accouplant avec des cannelures formées sur une réduction (5) reliée au stator. Les composants sont maintenus dans cette configuration par un anneau de cisaillement (23) jusqu'à ce que la pression fluide dans une chambre (28) définie entre l'élément (12) de verrouillage et la réduction (5) soit suffisante pour provoquer le cisaillement de l'anneau de cisaillement. L'élément (12) de verrouillage peut ensuite se dégager du rotor pour libérer le moteur en vue de son fonctionnement. L'élément de verrouillage est maintenu dans cette position par un mécanisme (35) d'encliquetage.

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