METHOD AND DEVICE FOR ELECTRIC LOGGING OF CASED WELL Russian patent published in 2007 - IPC G01V3/20 

FIELD: geophysics.

SUBSTANCE: in accordance to the invention, multi-electrode flexible probe is used, measuring current through electrodes, potential of electric field and its first differences. ρ_η is computed using determined functional theoretical or experimental dependencies and constants, received during equipment check. Measurement of probe parameters in each point of well depth with given discontinuity step and computation of ρ_η are performed with multiple compression of measuring electrodes of flexible probe until receipt under effect of pulse-increased hydraulic pressure of required contact of measuring electrodes with the column and/or of two coinciding values of ρ_η with consideration of confidence probability to precision of statistic measurements.

EFFECT: expanded range and increased precision of detection of specific electric resistance ρ_η.

2 cl, 12 dwg