NMR measurement on frozen cores

Details NMR measurement on frozen cores NMR measurement on frozen cores

1984-08-29

1986-06-17

Tokar, Michael J.

Electricity: measuring and testing

Particle precession resonance

324303, G01R 3320

Patent

active

045958785

ABSTRACT:
A method of evaluating geologic rock samples and particularly sandstone. The sample is saturated with fresh water and the temperature of the sample is reduced to a temperature below the freezing point of the fresh water. As the sample is warmed, nuclear magnetic resonance measurements are made at just below 0.degree. C. and again at about the operating temperature of the NMR probe, i.e., about 32.degree. C. The portion of the water within the sample that can be considered to be residual water can be determined from the relationship of NMR measurements taken at just below 0.degree. C. and at the temperature of the probe.

REFERENCES:
patent: 2913658 (1959-11-01), Burdine
patent: 3987361 (1976-10-01), Martin
patent: 4291271 (1981-09-01), Lauffer
patent: 4295365 (1981-10-01), Meshri
patent: 4350955 (1982-09-01), Jackson et al.
S. C. Mraw et al., "Water in Coal Pores: Low Temperature Heat Capacity Behavior of the Moisture of Wyodak Coal," Science, vol. 205, Aug. 1979, pp. 901, 902.

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