Surface deployed cement separation plug

Details Surface deployed cement separation plug Surface deployed cement separation plug

E - Fixed Constructions

21

B

E21B 33/16 (2006.01) E21B 33/13 (2006.01) E21B 33/134 (2006.01)

Patent

CA 2462866

A separation barrier for placement in an open well bore or casing, to prevent migration of cement slurry downwardly into the drilling fluid, facilitating the placement of a cement plug to segregate a well bore into uphole and downhole portions. The barrier has an annular seal which facilitates pumping the barrier downhole through a work string to a desired location. The separation barrier also has a plurality of flexible elongated elements which expand outwardly when the barrier exits the work string. The elongated elements are closely spaced to prevent migration or contamination of cement slurry therebetween. The barrier can also have a shearable landing ring for providing positive indication of placement of the barrier at the desired location.

L'invention concerne une barrière de séparation, destinée à être placée dans un forage ou dans un cuvelage de puits ouvert, afin d'empêcher la migration de la suspension de ciment dans le liquide de forage, facilitant ainsi le placement d'un tampon de ciment servant à séparer un forage en portions supérieure et inférieure. La barrière comprend une étanchéité annulaire qui facilite le pompage de la barrière dans le bas du forage à un emplacement désiré au moyen d'une rame de travail. La barrière de séparation comprend aussi plusieurs éléments oblongs souples qui se déploient vers l'extérieur lorsque la barrière sort de la rame de travail. Ces éléments oblongs sont étroitement espacés afin d'empêcher la migration entre eux de suspension de ciment. La barrière peut aussi comprendre un anneau d'arrivée, susceptible de cisaillement, permettant d'indiquer positivement si la barrière est arrivée au bon endroit.

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