Electricity: measuring and testing – Particle precession resonance – Using well logging device
Patent
1998-11-24
2000-10-17
Arana, Louis
Electricity: measuring and testing
Particle precession resonance
Using well logging device
324300, G01V 300
Patent
active
061337358
ABSTRACT:
A technique is provided for determining a nuclear magnetic resonance characteristic of formations surrounding an earth borehole, including the following steps: providing a logging device that is moveable through the borehole; providing, on the logging device, first and second coils having respective axes that are generally orthogonal; producing, at the logging device, a prepolarizing signal; applying pulse sequence signals to the first and second coils, the pulse sequence signals implementing repeated refocusing of spins in the formations by both adiabatic and non-adiabatic reorienting of the spins to form spin echoes; and detecting, at the logging device, the spin echoes from the formations, the spin echoes being indicative of the nuclear magnetic resonance characteristic of the formations.
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Hurlimann Martin D.
Ryu Seungoh
Sen Pabitra N.
Song Yi-Quao
Arana Louis
Batzer William B.
Novack Martin M.
Schlumberger Technology Corporation
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