Title: Dual function logging tool and method

Abstract: A method and apparatus for converting a single function, i.e., hydrocarbon detection, well logging tool to a dual function tool, i.e., the detection of naturally occurring gamma rays, by making the amplitude reference pulses necessary for single function operation related in rate to the second function. A minimum constant rate of amplitude reference pulses are provided to ensure the operability of the single function tool in the absence of the second function and an adjustment is thereafter made to remove the effects of this minimum rate of reference pulses.

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Inventors: Kampfer, John G. (Houston, TX, US)

Application Number: 471900
Filing Date: 1974-05-21
Publication_date: 1976-01-27
Assignee: Halliburton Company (Duncan, OK)
Primary Class(es): 340/854.9 250/256, 327/98, 327/105, 340/855.4, 340/870.19
Other Classes:
US Patent Ref:

2998521	Aug, 1961	Ranki, Jr.	250/263.
3445658	May, 1969	Ward	250/263.
3612771	Oct, 1971	Caniquit	179/15.
3697875	Oct, 1972	Guanella	325/42.
3732495	May, 1973	McRae et al.	340/203.

Other Refs:
Primary Examiner: Tubbesing, T. H.
Assistant Examiner: Birmiel, H. A.
Attorney: Burns, Doane, Swecker & Mathis