METHOD AND APPARATUS FOR ELECTRICAL CASED WELL LOGGING Russian patent published in 2014 - IPC G01V3/20 

FIELD: physics; geophysics.

SUBSTANCE: invention relates to geophysics. The method includes using a multielectrode flexible probe which measures current through the electrodes, electric field potential and first differences thereof; calculating ρ_p using established functional theoretic or experimental relationships and constants obtained when calibrating equipment. Measurement of parameters of the probe at each depth point of the well with a given discrete pitch and calculation of ρ_p are carried out with repeated pressing of the measurement electrodes of the flexible probe until obtaining, under the action of an increasing pulsed hydraulic pressure, the required contact between the measurement electrodes and the casing and/or coinciding two values of ρ_p based on the confidence level for the accuracy of statistical measurements.

EFFECT: wider range and high accuracy of determining resistivity ρ_p.

2 cl, 12 dwg