Abstract:

The theory and method for measuring the sondeerrors of horizontal array induction logging tool in half space are discussed, and the correction charts
and correction formulae are presented. The influence of conductivity of homogeneous formation on the cal-ibrating value of the tool factor in half space is dis-cussed. According to the predetermined relationship between background signals and the difference of lower and upper signals, the sonde errors of individ-ual output curves of each array can be determined
with the tool horizontally hanging at two different heights, even if the conductivity of the formation is unknown. The results suggest that influence of the formation on the calibrating value of the tool factor can be neglected if the coils are far away form the surface and the formation conductivity is small.

Key words: Array induction logging, Instrument, Cal-ibration, Error, Correction