Patent ID: 6856255
Filing Date: 2005-02-15
Classification: E21B,G08C

Abstract:
1. An electromagnetic link system comprising: a first electromagnetic transducer sealingly disposed in an outer wall of a tool mandrel, the mandrel adapted to be positioned in a drill collar; a second electromagnetic transducer sealingly disposed in an interior of a port in the drill collar, the second transducer disposed proximate the first transducer when the mandrel is positioned in the drill collar; a third electromagnetic transducer sealingly disposed in an exterior of the port in the collar, the second and third transducers defining a sealed chamber in the port, the second and third transducers electrically coupled to power conditioning and signal processing circuits disposed in the chamber; and a fourth electromagnetic transducer positioned proximate the third transducer, the fourth transducer electrically coupled to at least one of a sensor, an external communication line and an external power line.