Doubly-compensated dual-detector density logging apparatus

Details Doubly-compensated dual-detector density logging apparatus Doubly-compensated dual-detector density logging apparatus

1976-01-16

1977-09-13

Willis, Davis L.

Radiant energy

Geological testing or irradiation

Well testing apparatus and methods

250269, 250268, G01V 500

Patent

active

040484955

ABSTRACT:
A technique for determining the density of an earth formation with a logging sonde including a gamma ray source and two gamma ray detectors spaced at different distances from the source is disclosed. The count rate of the short-spaced detector is measured in two energy ranges covering back-scattered gamma rays which have undergone relatively low and high attenuations respectively. A first density correction is determined from the difference between the apparent density derived from the count rate of the long-spaced detector and the density derived from the count rate of the short-spaced detector in the energy range covering gamma rays with relatively low attenuation. A second density correction is determined from the difference between the densities derived from the two short-spaced detectors' count rates. These two density corrections are added to the apparent density to give the true formation density.

REFERENCES:
patent: 3202822 (1965-08-01), Kehler
patent: 3281599 (1966-10-01), Baker et al.
patent: 3521063 (1970-07-01), Tittman
patent: 3654470 (1972-04-01), Wilson
patent: 3789219 (1974-01-01), Wilson
patent: 3860816 (1975-01-01), Wilson
patent: 3900733 (1975-08-01), Seeman

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