Nuclear magnetic resonance tool using switchable source of...

Details Nuclear magnetic resonance tool using switchable source of... Nuclear magnetic resonance tool using switchable source of...

2006-07-27

2010-12-28

Shrivastav, Brij B (Department: 2831)

Electricity: measuring and testing

Particle precession resonance

Using well logging device

C324S300000

Reexamination Certificate

active

07859260

ABSTRACT:
A nuclear magnetic resonance sensing apparatus and method for operating in an earth borehole comprises a source of switchable magnetic field to polarize nuclei in the region of interest, said source comprising a coil wound on a magnetic core having controllable residual magnetization. Maintaining the magnetization of the core during a polarization interval does not require steady current in the coil. Switching intensity and polarity of magnetization of the core causes precession of spin magnetic moments of the nuclei; the precession induces a signal indicative of nuclear magnetic resonance properties of earth formations.

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