Electricity: measuring and testing – Particle precession resonance – Using a nuclear resonance spectrometer system
Patent
1995-10-23
1996-12-17
O'Shea, Sandra L.
Electricity: measuring and testing
Particle precession resonance
Using a nuclear resonance spectrometer system
324303, G01R 3348
Patent
active
055857205
ABSTRACT:
A method of reducing bias error in nuclear magneic resonance (NMR) spin-echo signals. The method includes filtering the signals using a filter having a bandwidth inversely related to the length of time from the initiation of the measurement of the NMR signals. In a preferred embodiment, the NMR spin-echo signal measurements are filtered using a moving average filter having an averaging span which increases with respect to the time elapsed from initiation of the spin-echo measurement sequence.
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SPE 28368: NMR Pore Size Distributions and Permeability at the Well Site: SPE 6th Annual Technical Conference and Exhibition, New Orleans, LA., 25-28 Sep. 1994.
SPE 20561: Spin Echo Magnetic Resonance Logging: Porosity adn Free Fluid Index Determination: SPE 69th Annual Technical Conference and Exhibition, New Orleans, LA. 25-28 Sep. 1994.
Fagin Richard A.
Mah Raymond Y.
O'Shea Sandra L.
Western Atlas International Inc.
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