Use of electrodes and multi-frequency focusing to correct eccentricity and misalignment effects on transversal induction measurements

摘要

A multicomponent induction logging tool uses a nonconducting mandrel. A central conducting member including wires that electrically connect at least one of the antennas to another of the antennas. Electrodes disposed about the transmitter antenna form a conductive path through a borehole fluid to the central conducting member.

主权项

1. An apparatus for determining a resistivity property of an earth formation, the apparatus comprising:
a logging tool having a non-conductive mandrel; a transmitter antenna; a pair of receiver antennas wherein an output of the pair of receiver antennas responsive to an activation of the transmitter antenna corrects for a misalignment of the transmitter antenna and the pair of receiver antennas; a central conducting member that electrically connect at least one of the receiver antennas to another of the receiver antennas; and a pair of electrodes disposed about the transmitter antenna forming a conductive path through a borehole fluid to the central conducting member.