Apparatus and method for making nuclear magnetic measurements in

Details Apparatus and method for making nuclear magnetic measurements in Apparatus and method for making nuclear magnetic measurements in

1998-09-09

2000-12-19

Oda, Christine K.

Electricity: measuring and testing

Particle precession resonance

Using well logging device

324306, G01V 300

Patent

active

061631515

ABSTRACT:
An NMR logging tool has a conducting permanent magnet with its axis parallel to the borehole axis to produce a static field in a portion of the formation surrounding a borehole that is parallel to the borehole axis. A dipole RF antenna with the dipole axis orthogonal to the borehole axis is used to produce an RF magnetic field orthogonal to the static field. The same antenna is used to receive the echo signals from excited nuclei in the formation. A number of gapped ferrite strips on the permanent magnet shield the permanent magnet from the RF field and enhance the RF field. Another form of the tool may be used for making Measurement-While-Drilling measurements with the permanent magnet set in a recess on a drilling collar.

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