Magnetically activated well tool

E - Fixed Constructions – 21 – B

Patent

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Details

E21B 47/09 (2006.01) G01M 3/40 (2006.01) G01N 27/82 (2006.01) G01V 3/26 (2006.01)

Patent

CA 2482096

A detector assembly (66) and methods including a magnetoresistive sensor (70) capable of detecting anomalies in the wall (21) of a casing string (11) disposed in a wellbore (10). Examples of anomalies include gaps between casings such as due to casing joints, air gaps in casing threads such as due to flush casing joints, enlarged casing wall thickness such as due to external casing collars, damaged casing, perforations, and other discontinuities or deformities in the casing. The detector assembly and methods detect perturbations in the earth's magnetic field caused by the anomalies. The detector assembly generates essentially no magnetic or electromagnetic field so that other downhole instrumentation is not affected by its presence.

La présente invention concerne un ensemble détecteur (66) et des procédés utilisant un capteur magnétorésistif (70) capable de détecter des anomalies dans la paroi (21) d'une colonne de tubage (11) disposée dans un puits (10). Les anomalies concernées sont essentiellement les intervalles entre tubages imputables aux accouplements de tubages, les bulles d'air dans les filetages des tubages imputables aux accouplements de tubage à purge, les surépaisseurs de paroi de tubage imputables aux joints de tubage externes, les tubages en mauvais état, les perforations, et autres discontinuités ou déformations du tubage. L'ensemble détecteur et les procédés permettent de détecter les perturbations du champ magnétique terrestre provoquées par ces anmalies. L'ensemble détecteur ne génère essentiellement pas de champ magnétique ou électromagnétique de façon que le reste de l'instrumentation de fond de puits ne soit pas affecté par sa présence.

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