Patent ID: 9632203
Date: 2017-04-25
CPC Classifications: G01N,G01R,G01V

Claim:
1. A method that determines a nuclear magnetic resonance (NMR) signal or a resistivity of a formation or a geophysical sample, comprising the steps of: drilling a borehole with a well-logging tool into the formation or drilling into the formation with a well-logging tool in order to retrieve the geophysical sample; providing an excitation signal downhole to the formation or the geophysical sample by using a non-resonant excitation coil that has an H-bridge configuration switching system affixed to a drill collar, the provided excitation signal having at least one frequency; and detecting a responsive signal from the formation or the geophysical sample by using a detection coil also affixed to the drill collar, wherein the detected responsive signal comprises at least one of the NMR signal or the resistivity.