E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
E21B 23/00 (2006.01) E21B 21/10 (2006.01)
Patent
CA 2501691
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 (242) slidably mounted in a body between positions in which at least one aperture in the body is opened and closed. Movement of the piston (242) is controlled by a pin (86), secured to one of the body and a control member, and a control groove (52) formed in the other of the body and control member for receiving a portion of the pin. An arrangement of elements (232, 276) respectively connected to the control member and body is such as to normally resist axial movement of the control member from a first axial position to a second axial position. A spring (44) is located in a chamber for biasing the piston (242). The chamber is vented by an opening in the body.
L'invention concerne un appareil de fond et, en particulier, mais non exclusivement, des réductions de tiges de circulation à cycles multiples utilisées au cours d'opérations de forage de fond. L'appareil comprend un piston (242) monté par glissement dans un corps entre des positions dans lesquelles au moins une ouverture du corps est ouverte et fermée. Le mouvement du piston (242) est commandé par une broche (86) fixée au corps ou à l'élément de commande, et une rainure centrale (52) est formée dans le corps ou l'élément de commande pour recevoir une partie de la broche. La configuration d'éléments (232,276) respectivement connectés à l'élément de commande et au corps est destinée à résister au mouvement axial de l'élément de commande d'une première position axiale à une seconde position axiale. Un ressort (44) est situé dans une chambre de polarisation du piston (242). La chambre est ventilée par une ouverture du corps.
Gilles Ian Alexander
Mcgarian Bruce
Tulloch Rory Mccrae
Bereskin & Parr Llp/s.e.n.c.r.l.,s.r.l.
Smith International Inc.
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