Dual spectra well logging system and method

Radiant energy – Geological testing or irradiation – Well testing apparatus and methods

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Details

250264, G01V 500

Patent

active

040428249

ABSTRACT:
A well logging system and method in which a transmitter in a borehole has at least two radiation detectors sensing either the same condition or two different conditions relating to the earth's formation traversed by the borehole and providing pulse signals having reference pulses and data pulses corresponding in number and peak amplitude to the sensed condition. Each pulse signal is sampled at different times by a sampling circuit which provides pulses of opposite polarity whose amplitudes correspond to the amplitudes of the first pulses occurring during sampling periods. The pulses from the sampling circuit are conducted to surface electronics by a single conductive path such as the inner conductor and the shield of an armored coaxial cable. The surface electronics include a pulse separation circuit which separates the pulses polarity. Processing circuits process the separated pulses to provide records of at least two spectra.

REFERENCES:
patent: 2659014 (1953-11-01), Scherbatskoy
patent: 2740053 (1956-03-01), Scherbatskoy
patent: 2911536 (1959-11-01), Scherbatskoy
patent: 3142757 (1964-07-01), Basham
patent: 3925749 (1975-12-01), McLaughlin

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