An electromagnetic induction method and apparatus for the...

G - Physics – 01 – V

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G01V 3/10 (2006.01) G01V 3/28 (2006.01)

Patent

CA 2384833

Provided is a technique, including a method and a computer program product ( 19), to dynamically measure characteristics of geologic formations (10) while hydrocarbons ( 14a, 14b) are being extracted therefrom. Specifically, the present invention allows measuring the resistivity of geologic formations (10) in which a borehole (12a) has been formed therein and encased with a conductive casing, such as a conductive liner ( 16a, 16b). This has been achieved by providing a method and computer program product (19) that compensates for the effects of a conductive liner (16a, 16b) by measuring the characteristics of the geologic formation (10) as a function of a ratio of two magnetic fields sensed by a receiver (24) disposed in one of the boreholes (12a, 12b).

L'invention concerne une technique dans laquelle un procédé et un produit de programmation informatique (19) sont utilisés, pour la mesure dynamique des caractéristiques de formations géologiques (10) alors que des hydrocarbures (14a, 14b) sont extraits de ces dernières. Le procédé et l'appareil de l'invention permettent notamment de mesurer la résistivité de formations géologiques (10) dans lesquelles un trou de forage (12a) a été formé et doté d'un cuvelage conducteur, tel qu'une colonne de tubage perdu (16a, 16b). Pour ce faire, on prévoit un procédé et un produit de programmation informatique (19) qui compense les effets d'un cuvelage conducteur (16a, 16b) par la mesure des caractéristiques de la formation géologique (10), en fonction d'un rapport entre deux champs magnétiques détectés par un récepteur (24) prévu dans un des trous de forage (12a, 12b).

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