Azimuthal NMR imaging of formation properties from a wellbore

Details Azimuthal NMR imaging of formation properties from a wellbore Azimuthal NMR imaging of formation properties from a wellbore

2005-05-31

2005-05-31

Arana, Louis (Department: 2859)

Electricity: measuring and testing

Particle precession resonance

Using well logging device

C324S314000

Reexamination Certificate

active

06900630

ABSTRACT:
A method and apparatus for performing NMR measurements suppressing contribution to NMR signals from within the borehole. Within the region of examination, the RF magnetic field has a spatially varying intensity. NMR signals (free induction decay or spin echo signals) are inverted to give spin density as a function of field intensity. This inversion is then mapped to spatial positions using the known RF field variation. The effect of signals arising from within the borehole can be suppressed. It is also possible to obtain an azimuthal image of the spin density.

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