Stabilized radioactive logging method and apparatus

Details Stabilized radioactive logging method and apparatus Stabilized radioactive logging method and apparatus

1979-05-29

1981-11-10

Smith, Alfred E.

Radiant energy

Geological testing or irradiation

Well testing apparatus and methods

250363R, G01V 500, G01T 120

Patent

active

043000436

ABSTRACT:
An oil well logging apparatus is disclosed for detecting radiation emanating or returning from an oil well formation. The apparatus has a scintillation crystal adjacent a photomultiplier tube for detecting light flashes generated in the crystal by radiation. A low energy gamma source is included in the crystal for generating a known peak of pulse counts in the energy spectrum. A cadmium shield is placed over the crystal to block low energy radiation which would tend to mask the peak of gamma source pulses. This known peak is divided electrically downhole by window discriminators such that the peak is equally divided into two windows at a standard condition. If the frequency of pulses in one window varies from the frequency of pulses in the second window, a correction factor is generated downhole for varying the pulse height of the entire spectrum until the frequency of pulses in each window is again equal. Salinity compensation is also accomplished by samarium sleeves in the logging sonde.

REFERENCES:
patent: 3270205 (1966-08-01), Ladd et al.
patent: 3767921 (1973-10-01), Jones
patent: 3772513 (1973-11-01), Hall, Jr. et al.
patent: 3829686 (1974-08-01), Schultz et al.
patent: 3916685 (1975-11-01), Paap et al.
patent: 3939343 (1976-01-01), Schultz et al.
patent: 4002903 (1977-01-01), Pitts, Jr. et al.
patent: 4053767 (1977-10-01), Kampfer et al.

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