Ranging Tool System

Ranging Tool System NT-1

A rotating magnetic field rangefinder for measuring relative distance between drilling wells includes a permanent magnet, underground detectors and ground interface box, wherein the permanent magnet drill collar is composed of a permanent magnet drill collar body, and a plurality of permanent magnets inside the said body, the said permanent magnet is fixed to the rear end of the said drill collar to form rotating magnetic field short section, rotating with the drilling bit together to generate a rotating magnetic field for providing a magnetic field source.