Multi-cycle downhole apparatus

Details Multi-cycle downhole apparatus Multi-cycle downhole apparatus

E - Fixed Constructions

21

B

E21B 21/08 (2006.01) E21B 21/10 (2006.01) E21B 23/00 (2006.01)

Patent

CA 2452705

The present invention relates to downhole apparatus and particularly but not exclusively, to multi-cycle circulating subs used during downhole drilling operations. Apparatus is provided comprising a piston (42) slidably mounted in a body (4) between positions in which at least one aperture (40) in the body is opened and closed. Movement of the piston (42) is controlled by a pin (86) secured to one of the body and a control member, and a control groove (52) in which a portion of the pin is received formed in the other of the body and control member. An arrangement of elements (32, 76) respectively connected to the control member and body is such that, as the control member moves axially, increasing lengths of said elements locate adjacent one another so as to provide resistance to relative rotation in at least one direction of the control member and body. The relative rotation is rotation which presses the control member against the control groove. The present invention thereby provides means by which the risk of damage to the control pin is reduced.

La présente invention concerne un appareil de fond de trou et particulièrement, mais pas exclusivement, des raccords de réduction utilisés pendant les opérations de forage au fond. L'appareil comprend un piston (42) qui est monté dans un corps (4) et qui coulisse entre des positions dans lesquelles au moins une ouverture (40) du corps est ouverte et fermée. Le mouvement du piston (42) est commandé par une goupille (86) fixé au corps et à un élément de commande, et par une gorge de commande (52) qui reçoit une partie de la goupille formée dans l'autre corps et dans un autre élément de commande. L'agencement des éléments (32, 76) reliés à l'élément de commande et au corps respectivement est tel que lorsque l'élément de commande se déplace axialement, les longueurs croissantes desdits éléments viennent se placer les unes contre les autres de manière à opposer une résistance au mouvement de rotation relatif dans au moins une direction de l'élément de commande et du corps. Ce mouvement de rotation relatif correspond à une rotation qui plaque l'élément de commande contre la gorge de commande. Cette invention permet de réduire les risques d'endommagement de la goupille de commande.

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