Selective NMR pulse for downhole measurements
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United States of America Patent
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Nov 12, 2019
Grant Date -
Jan 18, 2018
app pub date -
Dec 22, 2015
filing date -
Dec 22, 2015
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Abstract
Various embodiments include a method for generating a pulse for use in nuclear magnetic resonance (NMR) logging. One such method generates the pulse by adjusting one or more of pulse parameters including a pulse shape, a pulse amplitude, a pulse phase, and/or a pulse frequency. The generated pulse produces a substantially uniform nuclear spin saturation or nuclear spin inversion response from a fluid. A wait time between the pulse transmission and an echo that indicates spin equilibrium has been achieved is substantially equal to a T1 time indicating characteristics of the fluid.
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