Electricity: measuring and testing – Particle precession resonance – Using well logging device
Patent
1994-03-29
1995-07-11
O'Shea, Sandra L.
Electricity: measuring and testing
Particle precession resonance
Using well logging device
G01R 3320
Patent
active
054324467
ABSTRACT:
NMR logging apparatus is provided which produces a strong, static and homogeneous magnetic field B.sub.0 in a Volume of an adjacent formation on one side of the tool to measure nuclear magnetic resonance characteristics thereof at two different depths of investigations. In the preferred embodiment, the tool has an RF antenna mounted on the outside of the metal body of the tool, directing focused oscillating magnetic fields B.sub.1 at said Volume to polarize or tip the magnetic moments of hydrogen nuclei of fluids within rock pores. The same antenna can be used to receive signals of proton precession in the Volume of interest immediately after transmission of the RF polarizing field B.sub.1. One of the NMR readings is employed to compensate for inaccuracies in the other NMR reading to provide an overall improved NMR log.
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"Spin Echo Magnetic Resonance Logging: Porosity and Free Fluid Index Determination" SPE 20561, pp. 321-332.
MacInnis Jason P.
Macune Don T.
Morriss Christopher E.
Oldigs Richard W.
Smaardyk John E.
Garrana Henry N.
Mah Raymond Y.
O'Shea Sandra L.
Schlumberger Technology Corporation
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