Radiant energy – Geological testing or irradiation – With drill or drilling
Patent
1986-11-14
1987-11-10
Fields, Carolyn E.
Radiant energy
Geological testing or irradiation
With drill or drilling
250262, 250264, 250266, 250269, G01V 512
Patent
active
047059443
ABSTRACT:
A gamma ray density sub and method useful for measurement-while-drilling applications utilizing a gamma ray source and detector located on the rotating sub and computation of the product of the counting rates obtained from at least three locations in the formation sample, the locations being located in a azimuthally symmetric pattern about the sub therefore indicating the average density location in the 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: 3255353 (1966-06-01), Scherbatskoy
patent: 3389257 (1968-06-01), Caldwell et al.
patent: 3617746 (1972-11-01), Janssen
patent: 3840746 (1974-10-01), Kehler
patent: 3846631 (1974-11-01), Kehler
patent: 4048495 (1977-09-01), Ellis
patent: 4297575 (1981-10-01), Smith, Jr. et al.
patent: 4596926 (1986-06-01), Coope
Fields Carolyn E.
NL Industries Inc.
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