Zonal isolation of telescoping perforation apparatus with...

E - Fixed Constructions – 21 – B

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E21B 43/26 (2006.01) E21B 34/14 (2006.01)

Patent

CA 2708738

A method and apparatus for isolating formation zones preferably with a memory based material formed into an expansion element, with an outer diameter larger than a borehole, adjacent to a radially telescoping perforation element, converting the memory based expansion element to a stable, smaller, run-in diameter, running it into the borehole, then allowing the memory based material to expand and seal against the borehole wall. Expansion can be enhanced by expanding a mandrel on which the expansion element is formed. The expansion element separates two or more groups of outwardly radially telescoping perforation elements, to isolate formation zones and allow the perforation elements to access the isolated zones.

L'invention concerne un procédé et un appareil pour isoler des zones de formation de préférence avec un matériau à mémoire formé en un élément de dilatation, ayant un diamètre extérieur supérieur à un trou de forage, adjacent à un élément de perforation télescopique radialement, pour convertir l'élément de dilatation à mémoire à un plus petit diamètre de rodage stable, pour le déplacer dans le trou de forage, puis pour laisser le matériau à mémoire se dilater et se sceller contre la paroi du trou de forage. La dilatation peut être améliorée en dilatant un mandrin sur lequel l'élément de dilatation est formé. L'élément de dilatation sépare au moins deux groupes d'éléments de perforation télescopiques radialement vers l'extérieur, pour isoler des zones de formation et permettre aux éléments de perforation d'accéder aux zones isolées.

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