Selectively activated float equipment

Details Selectively activated float equipment Selectively activated float equipment

E - Fixed Constructions

21

B

E21B 21/10 (2006.01) E21B 23/00 (2006.01) E21B 33/14 (2006.01)

Patent

CA 2641397

A back pressure valve (1), particularly for reverse cementing application, having the following parts: a valve collar (10) connectable to a well pipe; an index J-slot (34) piston (30) coaxially positioned within the valve collar for longitudinal translation within the valve collar between closed, flow-open, and locked-open configurations; a detent for example in the form of a ball cage (20) or a flapper (27) in the index piston, wherein the detent restricts fluid flow in a circulation direction through a flow path through the index piston; a spring (50) that biases the index piston toward the closed and locked-open configurations; and a plug (60) of the valve collar that mechanically communicates with the index piston to be in corresponding closed, flow-open, and locked-open configurations.

L'invention concerne une soupape (1) de contre-pression, destinée en particulier à des applications de cimentation inverse, dotée des pièces suivantes : un collier (10) de soupape pouvant être relié à un tubage de puits ; un piston (30) indexable à rainure (34) en J positionné de façon coaxiale à l'intérieur du collier de soupape en vue d'une translation longitudinale à l'intérieur du collier de soupape entre des configurations fermée, ouverte à l'écoulement et verrouillée en position ouverte ; un cran ayant par exemple la forme d'une cage (20) à bille ou d'un volet (27) dans le piston indexable, ledit cran limitant l'écoulement du fluide dans une direction de circulation passant par un trajet d'écoulement traversant le piston indexable ; un ressort (50) qui sollicite le piston indexable en direction des configurations fermée et verrouillée en position ouverte ; et un bouchon (60) de collier de soupape qui communique mécaniquement avec le piston indexable pour se trouver dans les configurations fermée, ouverte à l'écoulement et verrouillée en position ouverte correspondantes.

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