Junction isolation apparatus and methods for use in...

Details Junction isolation apparatus and methods for use in... Junction isolation apparatus and methods for use in...

E - Fixed Constructions

21

B

E21B 43/26 (2006.01) E21B 17/00 (2006.01) E21B 33/10 (2006.01) E21B 41/00 (2006.01) E21B 43/12 (2006.01)

Patent

CA 2430793

Specially designed apparatus is utilized to provide convenient isolation of a wellbore junction from pressure and corrosion during an acid fracturing stimulation process performed in a main or branch wellbore portion downhole from the junction. The apparatus has an outer tubular portion which may be installed, in a single trip into the main wellbore, in a straddling and sealing relationship with the junction, and an inner tubular structure sealingly and removably received within the outer tubular structure. Fracturing acid may be pumped directly down the main wellbore, and then to the formation to be stimulated, via the interior of the outer tubular structure, after the removal of the inner tubular structure subsequent to its use in facilitating a downhole pressure test of a lower end seal portion of the outer tubular structure.

Cet appareil de conception particulière sert à fournir l'isolation appropriée d'un raccordement de forage contre la pression et la corrosion pendant un processus de stimulation de fracturation à l'acide réalisé dans une partie principale ou secondaire du puits de forage, au fond du trou à partir du raccordement. L'appareil possède une partie tubulaire externe qui peut être installée en un seul voyage dans le puits de forage principal, à cheval sur le raccordement à des fins d'étanchéité, ainsi qu'une structure tubulaire interne étanche et amovible qui s'agence à la structure tubulaire externe. L'acide de fracturation peut être pompé directement dans le puits principal, puis dans la formation à stimuler par l'intermédiaire de la partie intérieure de la structure tubulaire externe. Une fois la structure tubulaire interne retirée après son utilisation pour faciliter l'essai de pression du fond de trou d'une partie étanche de l'extrémité inférieure de la structure tubulaire externe.

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