An electromagnetic downhole tool with mathematically complete azimuthal sensitivity capable to determine the direction and the distance to the formation boundary at a distance of up to 6 meters has been developed. The tool was specifically designed for proactive geonavigation while drilling horizontal and highly inclined wells in difficult geological conditions. Mathematically complete measurements in the plane transverse to the tool axis allow to detect the boundaries without rotation of a drill string. The tool was carefully simulated, designed, developed and documented. Experimental prototype was assembled and tested. The engineering prototype manufacturing is in progress.
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