Insulation Structure For Well Logging Instrument Antennas

A method for forming an electromagnetic antenna on a mandrel, comprising:

• forming a recess in an exterior surface of the mandrel;
• forming a feed through port between an exterior of the mandrel and an interior thereof proximate the recess;
• forming an antenna bed in the recess;
• forming an antenna in the antenna bed;
• electrically coupling the antenna to a feed through connector disposed in the feed through port;
• filling the feed through port with a sealing material;
• and
• disposing a cover on the antenna, wherein at least one of the antenna bed, the sealing material and the antenna cover is made from polyether ether ketone (PEEK) or a composite material thereof.

An electromagnetic well logging instrument, comprising:

• a sonde mandrel configured to be moved through a wellbore drilled through subsurface formations;
• an antenna bed disposed in a recess formed in an exterior of the mandrel;
• a feed through port disposed in the recess and providing a passage between the recess and an atmospheric chamber in the instrument mandrel;
• an antenna disposed on the antenna bed, the antenna electrically coupled to the atmospheric chamber through a feedthrough disposed in the port, the port filled with a sealing material;
• electrical circuits connected to the antenna to enable at least one of emission of electromagnetic energy and detection of electromagnetic energy by the antenna;
• an antenna cover disposed on the antenna, wherein at least one of the antenna bed, the sealing material and the antenna cover is made from polyether ether ketone (PEEK) or a composite material thereof.