Fracturing different levels within a completion interval of...

E - Fixed Constructions – 21 – B

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E21B 43/267 (2006.01) E21B 43/08 (2006.01) E21B 43/26 (2006.01)

Patent

CA 2417431

Method and apparatus for fracturing different levels of a completion interval in a well. A workstring (14) lowers a fracturing string (15) which, in turn, is comprised of a base pipe (20) which is blank except for perforated sections spaced along its length. Screen (31) may be provided over said sections to block the flow of sand into the base pipe. An alternate flow path (e.g., shunt tubes) (24) extends along the base pipe and has one or more outlets (25) spaced along its length. A slurry is flowed into the annulus surrounding the fracturing string. As liquid is lost from the slurry, sand from the slurry will form bridges (45) which act as mini gravel-packs at said perforated sections thereby isolating portions of the annulus. Slurry then flows through the shunts tube(s) (24) and out into the isolated portions to fracture the different levels in the completion interval.

L'invention concerne un procédé et un appareil de fracturation de différents niveaux d'un intervalle d'achèvement d'un puits. Une colonne d'ouvrage (14) permet de descendre une tige de fracturation (15) comprenant un tuyau de base (20) hermétique excepté dans des sections perforées espacées sur la longueur du tuyau. Un écran (31) peut être placé sur ces sections afin de bloquer le passage de sable dans le tuyau de base. Un autre circuit d'écoulement (des conduits de dérivation, par exemple) (24) est situé sur la longueur du tuyau de base et comprend une ou plusieurs sorties (25) espacées sur la longueur du circuit. Une boue est envoyée dans l'espace annulaire entourant la tige de fracturation. Lorsque le liquide de la boue est <= perdu >= dans une formation, le sable de la boue forme des bouchons (45) agissant comme de très petits amas de gravier auxdites sections perforées, ce qui isole les parties de l'espace annulaire. La boue circule ensuite à travers le(s) conduit(s) de dérivation (24) dans les parties isolées pour fracturer les différents niveaux de l'intervalle d'achèvement.

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