Nuclear magnetic resonance apparatus for use in drill location system on land or at sea, has magnet arranged at distance from another magnet, where movement assembly controls distance between magnets

摘要

The device has a magnet (306A), and another magnet (306B) arranged at distance from the former magnet. A movement assembly controls the distance between the magnets, where the movement assembly comprises a drive spindle (309). The spindle is connected with a portion with right-hand threads (311A) and another portion with left-hand threads (311B). A motor (305) rotates the spindle and is in communication with a surface location. An antenna (308) and a magnetic permeable element and rings are arranged between the magnets. An independent claim is also included for a method for surveying formation of a nuclear magnetic resonance (NMR) apparatus.