CURRENT-DIRECTING SHIELD APPARATUS FOR USE WITH TRANSVERSE MAGNETIC DIPOLE ANTENNAS

摘要

Shield apparatus are provided for use with logging instruments equipped with transverse magnetic dipole antennas. Flexible dielectric strips and dielectric cylindrical bodies are implemented with conductive elements in various patterns to form Faraday shield structures. The shields provide an extended conductive surface to the instrument support member and redirect axial currents along the borehole, protecting the underlying antenn as from the undesired effects of these currents.