G - Physics – 01 – V
Patent
G - Physics
01
V
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G01V 5/00 (2006.01) G01V 5/10 (2006.01) G01V 5/12 (2006.01)
Patent
CA 1062813
ABSTRACT OF THE DISCLOSURE The present invention pertains to the logging of earth formations by the use of logging instruments that have sources of high intensity nuclear radiation and that are passed through a borehole traversing the earth formation of interest, and, more specifically, to methods and appara- tus for logging in which the source of high intensity nuclear radiation is capable of being pulsed and produces a burst of either photons or neutrons that has a continuous energy spectrum. For logging purposes previously used sources of nuclear radiation have had one or more of the following disadvantages: they have been intensity limited by safety considerations; they have had limited energy spectrum capabilities thereby limiting their usefulness, or they have been incapable of pulsed operation thereby limiting the measurements that could be taken. A method and apparatus for logging an earth formation of interest is disclosed which uses a source of high intensity nuclear radiation that can produce valuable information about earth formation characteristics. Charged particles are accelerated to high energy levels in a number of individual cavities, and bombard a target to emit nuclear radiation which penetrates the surrounding media. The nuclear radiation returning to the borehole, as a result of the reaction of the emitted radiation and surrounding media, is detected. The acceleration of the particles is controlled according to variations of at least one condition in the cavities.
252732
Turcotte Ronald E.
Wahl John S.
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