Electricity: measuring and testing – Particle precession resonance – Using well logging device
Patent
1993-04-01
1994-12-27
Arana, Louis
Electricity: measuring and testing
Particle precession resonance
Using well logging device
324318, G01V 300
Patent
active
053768841
ABSTRACT:
The disclosure invention is directed to a nuclear magnetic resonance measurement apparatus that can be utilized in a logging device which operates generally centrally in a borehole, and has a generally circumferential region of investigation, but which permits usage of relatively powerful permanent magnets, such as rare-earth magnets, that are not permeable to the RF magnetic field. This is achieved by employing side-by-side spaced apart elongated magnets, and an RF current loop in the region between the magnets. In a disclosed embodiment, the magnets are each in the shape of a segment of a cylinder, and the respective axes of elongation of the magnets are parallel. The magnets have respective casings with electrically conductive surfaces, and the RF current loop includes at least a portion of the conductive surfaces of the magnet casings.
REFERENCES:
patent: 3179878 (1965-04-01), Schwede
patent: 3667035 (1972-05-01), Slichter
patent: 4350955 (1982-09-01), Jackson et al.
patent: 4710713 (1987-12-01), Strikman et al.
patent: 4714881 (1987-12-01), Givens
patent: 4717876 (1988-01-01), Masi et al.
patent: 4717877 (1988-01-01), Taicher et al.
patent: 4717878 (1988-01-01), Thaicher et al.
patent: 4933638 (1990-06-01), Kenyon et al.
patent: 5023551 (1991-06-01), Kleinberg et al.
patent: 5055787 (1991-10-01), Kleinberg et al.
patent: 5055788 (1991-10-01), Kleinberg et al.
patent: 5153514 (1992-10-01), Griffin et al.
R. L. Kleinberg, A. Sezginer, D. D. Griffin and M. Fukuhara, "Novel NMR Apparatus for Investigating an External Sample", Journal Of Magnetic Resonance 97, 466-485 (1992).
Richard K. Cooper and Jasper A. Jackson, "Remote (Inside-Out) NMR. I. Remote Production of a Region of Homogeneous Magnetic Field", Journal Of Magnetic Resonance 41, 400-405 (1980).
W. E. Kenyon, J. J. Howard, A. Sezginer, C. Straley, A. Matteson and K. Horkowitz, R. Ehrlich, "Pore-size Distribution and NMR in Microporous Cherty Sandstones", Trans, SPWLA, Paper LL, 1989.
W. E. Kenyon, P. I. Day, C. Straley and J. F.. Willemsen, "Compact And Consistent Representation Of Rock NMR Data For Permeability Extimation", SPE 15643.
M. N. Miller, Z. Paltiel, M. E. Gillen, J. Granot, and J. C. Bouton, "Spin Echo Magnetic Resonance Logging: Porosity and Free Fluid Index Determination", SPE 20561.
Arana Louis
Novack Martin M.
Pojunas Leonard W.
Schlumberger Technology Corporation
LandOfFree
Nuclear magnetic resonance measuring apparatus does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Nuclear magnetic resonance measuring apparatus, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Nuclear magnetic resonance measuring apparatus will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-921341