Patent ID: 8941383
Filing Date: 2015-01-27
Classification: E21B

Abstract:
1. A method for determining a geometry of a borehole comprising: disposing a nuclear magnetic resonance (NMR) logging device with a plurality of coils into the borehole; conducting scans of a borehole using each coil of the NMR logging device, wherein conducting scans of the borehole with each coil comprises propagating RF energy at one or more frequencies with each coil, wherein each scan comprises a frequency range from approximately 100 kilohertz (kHz) to 2 megahertz (MHz); using a processor to determine a borehole wall distance between each coil of the NMR logging device and the borehole based upon NMR measurements derived from the scans, wherein using a processor to determine a borehole wall distance comprises, for each coil: using the processor to determine the geometry of the borehole based at least partially upon the determined borehole wall distance between each coil and the borehole wall.