Electricity: measuring and testing – Particle precession resonance – Using well logging device
Patent
1983-06-27
1984-10-30
Tokar, Michael J.
Electricity: measuring and testing
Particle precession resonance
Using well logging device
324313, G01N 2700
Patent
active
044802277
ABSTRACT:
In accordance with the present invention, fluid-flow properties of a rock sample based on NMR response of the hydrogen nuclei of interstitial fluids within the pore space of such sample, can be swiftly and accurately achieved using a portable NMR instrument. Inherent instrument inadequacies (DC field inhomogeneity and large phase background jitter) are themselves relied upon to increase the data-throughput efficiency, i.e., the number of NMR responses performed per unit time. Result: Even though the instrument is placed at field sites away from the usual processing center, quick analysis of rock samples as during the drilling of a well, still results. Also, effects of possible echoes during subsequent measurements are prevented by using both the inhomogeneities of the DC field and the essentially random phase spectrum that is inherent in the instrument to average out echoes of prior generated NMR responses.
REFERENCES:
patent: 3302101 (1967-01-01), Glanville
patent: 3611118 (1971-10-01), Youngblood
patent: 3617868 (1971-11-01), Beitel
patent: 4291271 (1981-09-01), Lauffer
patent: 4296378 (1981-10-01), King
patent: 4318043 (1982-03-01), Crooks
patent: 4389613 (1983-06-01), Brown
patent: 4412178 (1983-10-01), Brown
patent: 4412179 (1983-10-01), Brown
Chevron Research Company
Keeling Edward J.
Messner Harold D.
Tokar Michael J.
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