Coal logging system

Details Coal logging system Coal logging system

1976-08-16

1978-01-03

Dixon, Harold A.

Radiant energy

Coded record and readers; invisible radiant energy type

250253, 250262, G01V 500

Patent

active

040668924

ABSTRACT:
A borehole logging tool employs two neutron sources of differing energy outputs, two gamma-ray detectors, and a neutron detector in the radioactivity logging of a coal-bearing formation. A first of the gamma-ray detectors measures the gamma rays produced by the formation in response to the higher energy neutron source. A second of the gamma-ray detectors measures the gamma rays produced by the formation in response to the lower energy neutron source. The neutron detector measures thermal or epithermal neutrons produced by the formation in response to the neutron sources. These measurements are selectively transferred to a recording system employing a plurality of energy level discriminators, count rate meters, and comparators. The recording system, in response to these measurements, provides output signals representative of the carbon, sulfur, ash, and neutron moderating power of the coal in the formation being logged. The carbon and neutron moderating power provide a means of measuring the energy content of coal.

REFERENCES:
patent: 3115579 (1963-12-01), Hall et al.
patent: 3509343 (1970-04-01), Locke
patent: 3654467 (1972-04-01), Tittman et al.
patent: 3849646 (1974-11-01), McKinlay et al.

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