NMR logging tool and method for fast logging

Details NMR logging tool and method for fast logging NMR logging tool and method for fast logging

1998-10-19

2000-10-31

Oda, Christine K.

Electricity: measuring and testing

Particle precession resonance

Using well logging device

324322, 324318, G01V 300

Patent

active

061408182

ABSTRACT:
A high speed, NMR, porosity measuring technique and instrument, is described. The instrument is configured with a long prepolarization region of up to approximately six feet disposed ahead of a short detection region of about six inches. The prepolarization region comprises permanent magnets. The detection region comprises homogeneous magnets and rf antenna. This tool design makes possible the acquisition of NMR porosity measurements at 1800 ft./hr., or more, with wait times between successive detection measurements of approximately one second.

REFERENCES:
patent: 4710713 (1987-12-01), Strikman
patent: 4933638 (1990-06-01), Kenyon et al.
patent: 5055787 (1991-10-01), Kleinberg
patent: 5486762 (1996-01-01), Freedman et al.
J. M. Singer, L. Johnson, R.L. Kleinberg, and C. Flaum, Fast NMR Logging for Bound Fluid and Permeability Logging, presented at SPWLA Annual Logging Symposium, 1997.

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