METHOD AND DEVICE FOR DEFINITION OF RESISTIVITY OF GEOLOGIC BED THROUGH WHICH CASED WELL PASSES Russian patent published in 2008 - IPC E21B49/00 G01V3/20 

FIELD: oil and gas industry.

SUBSTANCE: invention is referred to a method for definition of resistivity of a formation through which a cased well passes. Technical result is increase of accuracy definition of formation resistivity. For this purpose one well log of resistivity in a cased well is made and use results of logging measuring of resistivity in an open well, that before was made in the same well, that, at least, in one formation zone in which one resistivity was not inflected between tubing conditions and tubing absence, to deduce value of geometrical factor, regulating resistivity, and for definition of resistivity, by means of geometrical factor and the well log in a cased well, at least, in one zone which is distinct from a calibration zone in which one resistivity was inflected between an absence of tubing condition and a tubing condition.

EFFECT: increase of definition accuracy of a formation resistivity.

13 cl, 3 dwg