Method for altering the stress state of a formation and/or a...

E - Fixed Constructions – 21 – B

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E21B 23/01 (2006.01) E21B 43/10 (2006.01)

Patent

CA 2694822

A method for altering the stress state of a subterranean formation, comprises a) drilling a borehole into the formation, b) installing a tubular element (200) having a top end and a bottom end in the borehole, c) anchoring the tubular element to the formation at at least two points (201,202) along the length of the tubular element, and d) expanding (205) the tubular element, thereby inducing compression (300) between the two points. At least one anchoring point (504) may be selected such that a pair of adjacent anchoring points spans an unstable portion of the formation, anchoring means may be used, and the position of at least one anchor point (504) may be selected such that the distance (S1) between that anchor point and an adjacent anchor point is less than the maximum length (E) of pipe that could be expanded between two anchor points without failing.

L'invention concerne un procédé pour modifier l'état de contrainte d'une formation souterraine, qui comprend a) le percement d'un trou de forage dans la formation, b) l'installation d'un élément tubulaire ayant une extrémité en haut et une extrémité en bas du trou de forage, c) l'ancrage de l'élément tubulaire à la formation en au moins deux points sur la longueur de l'élément tubulaire et d) l'expansion de l'élément tubulaire, ce qui induit ainsi une compression entre les deux points. Au moins un point d'ancrage peut être choisi de telle sorte qu'une paire de points d'ancrage adjacents couvre une portion instable de la formation, des moyens d'ancrage peuvent être utilisés, et la position d'au moins un point d'ancrage peut être choisie de telle sorte que la distance entre ce point d'ancrage et le point d'ancrage adjacent soit inférieure à la longueur maximale du tuyau qui peut être expansée entre deux points d'ancrage sans défaillance.

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