Method and device for determining the resistivity in a...

E - Fixed Constructions – 21 – B

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E21B 49/00 (2006.01) G01N 33/24 (2006.01) G01R 27/02 (2006.01) G01V 3/20 (2006.01)

Patent

CA 2502958

The invention concerns a method for determining the resistivity in a formation crossed by a cased well, in which one carries out at least one resistivity log in the cased well and one uses the results of at least one resistivity log in the non-cased well, carried out in the same well previously, in order to, in at least one zone (10) of the formation in which the resistivity has not changed between the cased and non-cased condition, deduce the value of a geometric factor k conditioning the resistivity and for determining, by means of said geometric factor k and the log in the cased well, the resistivity in at least one zone (11) different to the calibration zone, in which the resistivity has varied between the non-cased condition and the cased condition.

La présente invention concerne un procédé visant à déterminer la résistivité dans une formation traversée par un puits tubé. A cet effet, on réalise un relevé des résistivités après tubage du puits. On compare ces résultats à ceux d'un relevé effectué avant le tubage du puits. Cela permet de déterminer, dans la formation, une zone (10) où le tubage n'a pas fait varier la résistivité. On peut en déduire une valeur de facteur géométrique k conditionnant la résistivité. Connaissant ce facteur géométrique k, et disposant du relevé pour le puits tubé, on peut établir la résistivité pour la zone non utilisée (11) pour l'étalonnage, et où le tubage a fait varier la résistivité.

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