Housing on the exterior of a well casing for optical fiber...

G - Physics – 01 – B

Patent

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G01B 11/16 (2006.01) E21B 47/00 (2006.01) E21B 47/06 (2006.01)

Patent

CA 2467588

Improved methods and apparatuses for directly monitoring well casing strain and structural integrity are disclosed that allows for monitoring of potentially damaging strain from any orientation or mode and over long stretches of well casing. In a preferred embodiment, optical fiber sensors are housed within a housing and attached to the exterior surface of the casing. The sensors may be aligned parallel, perpendicular, or at an appropriate angle to the axis of the casing to detect axial, hoop, and shear stresses respectively. The sensors are preferably interferometrically interrogatable and are capable of measuring both static and dynamic strains such as those emitted from microfractures in the well casing.

La présente divulgation décrit des méthodes et des appareils pour contrôler directement les contraintes imposées par les tubages et l'intégrité structurale des puits, qui permettent le contrôle des contraintes potentiellement dommageables, en raison de tout orientation ou mode, et sur de long étirements de tubage de puits. Dans une version préférée, des capteurs à fibres optiques sont contenus dans un boîtier et sont fixés à la paroi extérieure du tubage. Ces capteurs peuvent alignés en parallèle, à angle droit ou selon un angle approprié par rapport à l'axe du tubage pour détecter les contraintes axiales, en boucle ou de cisaillement, respectivement. Les capteurs peuvent être, de préférence, interrogés par interférométrie et peuvent mesurer les contraintes statiques et dynamiques, comme les contraintes produites par des microfractures dans le tubage du puits.

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