Enclosed nuclear-magnetism logging tool with compensated coil-is

Details Enclosed nuclear-magnetism logging tool with compensated coil-is Enclosed nuclear-magnetism logging tool with compensated coil-is

1976-08-23

1977-07-12

Rolinec, Rudolph V.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Frequency of cyclic current or voltage

324 5R, G01N 2700

Patent

active

040357180

ABSTRACT:
In the representative embodiment of the present invention disclosed herein, a nuclear-magnetism logging tool is arranged with at least its polarizing and detecting coil isolated in an enclosed chamber containing a uniquely-treated hydrogenous oil and preferably coupled to a suitable compensating system operatively arranged for responding to borehole pressure and temperature conditions. In particular, a selected, minor amount of a ferromagnetic colloid is dispersed in the oil in a sufficient concentration for uniquely effecting a controlled decay of nuclear magnetic noise signals from the coil-isolating oil, with this decay being of selected rapidity sufficient to avoid interference with the measurement of nuclear magnetic measurement signals from earth formations.

REFERENCES:
patent: 3042855 (1962-07-01), Brown
patent: 3538429 (1970-11-01), Baker, Jr.

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