Patent ID: 6114851
Filing Date: 2000-09-05
Classification: G01V

Abstract:
A method for using a pulsed nuclear magnetic resonance (NMR) tool in earth formations traversed by a borehole comprising:producing a static magnetic field having a first region of substantially uniform magnetic intensity at a first location in the borehole using at least two spaced-apart magnets in the NMR tool, the first location in the borehole having a first temperature;moving the NMR tool to a second location in the borehole having a second temperature;producing a static magnetic field having a second region of substantially uniform magnetic intensity at the second location in the borehole; and controllably moving the at least two spaced-apart magnets in a direction that is at least one of (i) relative to each other, and (ii) relative to the borehole, wherein the first region of substantially uniform magnetic intensity and the second region of substantially uniform magnetic intensity are substantially equal in size and distance from the NMR tool.