Casing expansion and formation compression for permeability...

E - Fixed Constructions – 21 – B

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E21B 29/00 (2006.01) E21B 43/26 (2006.01)

Patent

CA 2596201

Casing expansion and formation compression for permeability plane orientation. A method of forming at least one increased permeability plane in a subterranean formation includes the steps of: installing a casing section in a wellbore intersecting the formation; expanding the casing section in the wellbore; and then injecting a fluid into the formation, the injecting step being performed after the expanding step is completed. Another method includes the steps of: applying an increased compressive stress to the formation, the compressive stress being radially directed relative to a wellbore intersecting the formation; and then piercing the formation radially outward from the wellbore, thereby initiating the increased permeability plane. Yet another method includes the steps of: applying a reduced stress to the formation, the reduced stress being directed orthogonal to a wellbore intersecting the formation; and then piercing the formation with at least one penetration extending radially outward from the wellbore, thereby relieving the reduced stress at the penetration.

Expansion de tubage et compression de formation assurant l'orientation du plan de perméabilité. Une méthode de formation d'au moins un plan de perméabilité accrue dans une formation souterraine consiste à installer un tronçon de cuvelage dans un puits de forage intersectant la formation; à étendre le tronçon de cuvelage dans le puits de forage, puis à injecter un fluide dans la formation, l'étape d'injection étant exécutée après l'étape d'expansion. Une autre méthode consiste à appliquer une contrainte de compression accrue à la formation, la contrainte de compression étant radialement dirigée par rapport à un puits de forage intersectant la formation; puis à percer la formation radialement à l'extérieur du puits de forage, initiant ainsi le plan de perméabilité accrue. Une autre méthode consiste à appliquer une tension réduite à la formation, la tension réduite étant dirigée de manière orthogonale à un puits de forage intersectant la formation; puis à percer la formation avec au moins une pénétration s'étendant radialement à l'extérieur du puits de forage, libérant ainsi la tension réduite à la pénétration.

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