Tuning of nuclear magnetic resonance logging tools

Details Tuning of nuclear magnetic resonance logging tools Tuning of nuclear magnetic resonance logging tools

2006-04-11

2006-04-11

Gutierrez, Diego (Department: 2859)

Electricity: measuring and testing

Particle precession resonance

Using well logging device

Reexamination Certificate

active

07026814

ABSTRACT:
A method for tuning a nuclear magnetic resonance (NMR) tool having an operating frequency and equipped with an antenna, is disclosed comprising: (a) transmitting a rf magnetic field to a sample under investigation; (b) receiving an NMR signal from the sample within a detection window; (c) determining mistuning of said antenna relative to said operating frequency; (d) analyzing the received echo signal to determine mistuning of the received signal from the operating frequency. The mistuning of the received signals from the operating frequency may be determined by analyzing any changes in phase of the echo along the echo signal. The antenna tuning process may be automated by measuring calibrated signal amplitudes at more than one frequency and identifying a maximum amplitude. The system tuning may be maintained by repeating (a) through-(d) while operating the tool and implementing a feedback loop.

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Ernst, Richard R., Bodenhausen, Geoffrey and Wokaun, Alexander.Principles of Nuclear Magnetic Resonance in One and Two Dimensions. Oxford 1987. pp. 115-124.

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