Down hole bypass valve

Details Down hole bypass valve Down hole bypass valve

E - Fixed Constructions

21

B

E21B 34/10 (2006.01) E21B 21/00 (2006.01) E21B 21/10 (2006.01) E21B 23/00 (2006.01)

Patent

CA 2236863

The invention relates to bypass valves for use in wellbores, particularly but not exclusively to bypass valves used during the setting of hydraulic anchor packers. The invention provides a bypass valve for selectively isolating the interior of a down-hole assembly from the exterior thereof, the bypass valve comprising constraining means (42, 44, 52) being adapted to permit movement of a piston (30) from a first position to a second position in response to a predetermined pressure differential between a bore (58) of the piston (30) and the exterior of a boy (4) but normally preventing movement of the piston (30) to a third position in which the bore (58) of the piston (30) is substantially isolated from the exterior of the body (4), and overriding means for overriding the constraining means (42, 44, 52) so as to permit movement of the piston (30) to the third position. The invention thereby provides a bypass valve which resists any tendency to close prematurely and which communicates any such tendancy to the surface.

L'invention concerne des soupapes de dérivation destinées à des puits de forage, notamment mais non exclusivement des soupapes de dérivation utilisées durant l'installation de packers à ancre hydraulique. La soupape de dérivation permet d'isoler l'un par rapport à l'autre l'intérieur et l'extérieur d'un ensemble de fond, et comprend un système de contrainte (42, 44, 52) qui permet le déplacement d'un piston (30) d'une première position à une seconde, en réponse à une différence de pression prédéterminée entre le trou (58) du piston (30) et l'extérieur d'un corps (4), mais qui empêche normalement le déplacement du piston (30) vers une troisième position dans laquelle le trou (58) du piston (30) est sensiblement isolé de l'extérieur du corps (4); et un système de priorité qui prend la priorité sur le système de contrainte (42, 44, 52) de façon à permettre le déplacement du piston (30) vers la troisième position. La soupape de dérivation de l'invention résiste à toute tendance à la fermeture prématurée et communique cette tendance à la surface.

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