Formation density logging using multiple detectors and sources

Details Formation density logging using multiple detectors and sources Formation density logging using multiple detectors and sources

1983-03-11

1986-06-24

Smith, Alfred E.

Radiant energy

Geological testing or irradiation

Well testing apparatus and methods

250266, G01V 500

Patent

active

045969264

ABSTRACT:
A gamma ray density sub and method useful for measurement-while-drilling applications utilizing three pairs of gamma ray sources and detectors located symmetrically about the axis of the sub and computation of the product of the counting rates obtained from the three detectors to indicate the average density of a formation sample surrounding a borehole traversing an earth formation. The sub is able to measure the density of the sample, independent of the location of the sub within the borehole and the chemical composition of the interfering materials lying between the formation sample and the detectors.

REFERENCES:
patent: 3032658 (1962-05-01), Youmans
patent: 3038075 (1962-06-01), Youmans
patent: 3389257 (1968-06-01), Caldwell et al.
patent: 3617746 (1972-11-01), Janssen
patent: 3846631 (1974-11-01), Kehler
patent: 4048495 (1977-09-01), Ellis
patent: 4297575 (1981-10-01), Smith, Jr. et al.

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