Computer-controlled, portable pulsed NMR instrument and method o

Details Computer-controlled, portable pulsed NMR instrument and method o Computer-controlled, portable pulsed NMR instrument and method o

1981-04-15

1983-10-25

Tokar, Michael J.

Electricity: measuring and testing

Particle precession resonance

Using well logging device

324312, 324313, G01N 2700

Patent

active

044121792

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 computer-controlled, portable NMR instrument. The inherent instrument inadequacy of a DC field inhomogeneity is controllably augmented by an adaptively generated gating code (provided via a computer-controller in feedback relationship with an oscillator-master clock controlling a transmitter-pulser) to ensure that the nuclear magnetization precessional frequency is not a multiple of the RF interrogation frequency. 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.

REFERENCES:
patent: 3611118 (1971-10-01), Youngblood
patent: 3737766 (1973-06-01), Lubarsky
patent: 4045723 (1977-08-01), Ernst
patent: 4165479 (1979-08-01), Mansfield
patent: 4291271 (1981-09-01), Lauffer

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