Injection plane initiation in a well

E - Fixed Constructions – 21 – B

Patent

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E21B 43/267 (2006.01) E21B 33/138 (2006.01)

Patent

CA 2596773

Initiation of injection planes in a well. A method of forming at least one generally planar inclusion in a subterranean formation includes the steps of: expanding a wellbore in the formation by injecting a material into an annulus positioned between the wellbore and a casing lining the wellbore; increasing compressive stress in the formation as a result of the expanding step; and then injecting a fluid into the formation, thereby forming the inclusion in a direction of the increased compressive stress. Another method includes the steps of: expanding a wellbore in the formation by injecting a material into an annulus positioned between the wellbore and a casing lining the wellbore; reducing stress in the formation in a tangential direction relative to the wellbore; and then injecting a fluid into the formation, thereby forming the inclusion in a direction normal to the reduced tangential stress.

Procédé de formation de plans d'injection dans un puits. Procédé de formation d'au moins une inclusion généralement plane dans une formation souterraine qui comprend les étapes suivantes : l'agrandissement d'un puits de forage dans la formation par l'injection d'un matériau dans un anneau placé entre le puits de forage et un coffrage recouvrant le puits de forage; l'augmentation de la contrainte de compression dans la formation à la suite de l'étape d'agrandissement; l'injection d'un liquide dans la formation, formant ainsi l'inclusion dans la direction de l'augmentation de la contrainte de compression. Un autre procédé comprend les étapes suivantes : l'agrandissement d'un puits de forage dans la formation par l'injection d'un matériau dans un anneau placé entre le puits de forage et un coffrage recouvrant le puits de forage; la réduction de la contrainte dans la formation dans une direction tangentielle par rapport au puits de forage; l'injection d'un liquide dans la formation, formant ainsi l'inclusion dans une direction normale par rapport à la réduction de la contrainte tangentielle.

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