Patent ID: 9146286
Filing Date: 2015-09-29
Classification: E21B,G01R,G01V

Abstract:
1. A receiver system for identifying a location of a downhole tool assembly comprising a boring tool and a dipole magnetic field source that are moveable along a borepath, the receiver comprising: a first triaxial antenna to detect a point source dipole magnetic field from the dipole magnetic field source in three dimensions; a second triaxial antenna to detect the point source dipole magnetic field from the dipole magnetic field source in three dimensions simultaneously with the first triaxial antenna; and a processor to receive an antenna signal from each of the first triaxial antenna and the second triaxial antenna and using the antenna signals to determine the location of the downhole tool assembly comprising the boring tool and the dipole magnetic field source that are movable along the borepath; wherein the first triaxial antenna and the second triaxial antenna are laterally displaced from each other a distance.