Schlumberger Technology Corporation

Gilles Rouault

Ollivier Faivre

Isabelle M Dubourg

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 () 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 () different to the calibration zone, in which the resistivity has varied between the non-cased condition and the cased condition.

Method and device for determining the resistivity in a geological formation crossed by a cased well

Process for determining the resistivity (Rt) of a formation () surrounding a well () equipped with a casing () consisting of several casing segments () with an overlapping part (), and cement () in the overlapping part (), Application particularly to oil exploration.

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Boulogne, France

Gilles Rouault