Electricity: measuring and testing – Particle precession resonance – Using well logging device
Patent
1992-11-02
1994-03-01
Tokar, Michael J.
Electricity: measuring and testing
Particle precession resonance
Using well logging device
G01R 3320
Patent
active
052911373
ABSTRACT:
A nuclear magnetic resonance (NMR) logging system includes a NMR logging tool adapted to be disposed in a borehole and a processing system adapted to be disposed on the surface of the borehole, the logging tool including a microcomputer, the processing system including a computer; and a signal processing system in accordance with the present invention having a first part stored in the downhole microcomputer of the logging tool and a second part stored in the surface oriented computer of the processing system. In the downhole microcomputer, using the first part of the signal processing system, a plurality of signal plus noise amplitudes are produced from a set of measured spin echo data, and a plurality N.sub.w of the window sums I.sub.m,m+1 are produced from the signal plus noise ampltudes, the window sums being transmitted uphole to the processing system. By producing the window sums, the first part of the signal processing system compresses and eliminates redundant information from the measured spin echo data. In the surface oriented processing system, using the second part of the signal processing system, the plurality N.sub.w of the window sums I.sub.m,m+1 are used to generate new data which is ultimately recorded on a new output record medium. Spectral amplitudes {a.sub.l }, determined from the window sums, are used by the processing system to compute three log outputs and signal distributions presented as color maps. Three standard deviations are also computed. Log quality curves including signal phase and RMS noise are also computed.
REFERENCES:
patent: 3617867 (1971-11-01), Herzog
patent: 4350955 (1982-09-01), Jackson et al.
patent: 4389613 (1983-06-01), Brown
patent: 4408161 (1983-10-01), Brown
patent: 4412178 (1983-10-01), Brown
patent: 4412179 (1983-10-01), Brown
patent: 4480227 (1984-10-01), Brown
patent: 4710713 (1987-12-01), Strikman
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), Taicher 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.
Sezginer, A., Kleinberg, R. L., Fukuhara, A., and Latour, L. L., "Very Rapid Measurement of Nuclear Magnetic Resonance Spin-Lattice Relaxation Time and Spin-Spin Relaxation Time," J. of Magnetic Resonance, vol. 92, 504-527 (1992).
Kleinberg, R. L., Sezginer, A., Griffin, D. D., and Fukuhara, M., "Novel NMR Apparatus for Investigating and External Sample," J. of Magnetic Resonance, vol. 97, 466-485 (1992).
Gallegos, D. P. and Smith, D. M., "NMR Technique for the Analysis of Pore Structure: Determination of Continuous Pore Size Distributions," J. of Colloid and Interface Science, vol. 122, No. 1, pp. 143-153, Mar. 1988.
Brown, R. J. S., Borgia, G. C., Fantazzini, P., and Mesini, E., "Problems in Identifying Multimodal Distributions of Relaxation Times for NMR in Porous Media," Magnetic Resonance Imaging, vol. 9, pp. 687-693 (1991).
Kenyon, W. E., Howard, J. J., Sezginer, A., Straley, C., Matteson, A., Horkowitz, R., and Erlich, R., "Pore-size Distribution and NMR in Microporous Cherty Sandstones", Trans. of the SPWLA of the 30th Ann. Logging Symp., Paper LL, Jun. 11-14, 1989.
Latour, L. L., Kleinberg, R. L., and A. Sezginer, "Nuclear Magnetic Resonance Properties of Rocks at Elevated Temperatures," J. of Colloid and Interface Science, vol. 150, 535 (1992).
Twomey, S., "Introduction to the Mathematics of Inversion in Remote Sensing and Indirect Measurements," published by Elsevier Scientific Publishing Company, 1977.
Straley, C., Morriss, C. E., Kenyon, W. E., and Howard, J. J., "NMR in Partially Saturated Rocks: Laboratory Insights on Free Fluid Index and Comparison with Borehole Logs," Trans. of the SPWLA 32nd Ann. Logging Symp., Paper CC, Jun. 16-19, 1991.
Butler, J. P., Reeds, J. A. and Dawson, S. V., "Estimating Solutions of First Kind Integral Equations with NON-Negative Constraints and Optimal Smoothing," SIAM J. Numerical Anal., vol. 18, No. 3, 381-397, 1981.
M. N. Miller, Z. Paltiel, M. E. Gillen., J. Granot, and J. C. Bouton, NUMAR Corp., Article: "Spin Echo Magnetic Resonance Logging Porosity and Freed Fluid Indes Determination" SPE 20561, 321-332.
Ram M. Narayanan, Article: "Data Compression in Remote Sensing Applications", IEEE Geoscience and Remote Sensing Society Newsletter, Sep. 1992.
Bouchard John H.
Garrana Henry N.
Schlumberger Technology Corporation
Tokar Michael J.
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