Pulsed neutron logging: multipurpose logging sonde for...

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G - Physics

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G01V 5/00 (2006.01) E21B 47/12 (2006.01) G01V 5/10 (2006.01)

Patent

CA 1048162

PULSED NEUTRON LOGGING: MULTIPURPOSE LOGGING SONDE FOR CHANGING TYPES OF LOGS IN THE BOREHOLE WITHOUT BRINGING THE SONG TO THE SURFACE (D#74,166-F) ABSTRACT OF THE INVENTION Disclosed is a system for nuclear well logging in which neutron pulse time duration for a high energy neutron generator and the frequency of pulses are selected downhole in the tool by use of a coded signal transmitted by the cable from the earth's surface. Separate channel systems are provided in the downhole tool fox desired neutron pulse width and repetition frequency and are operated by a decoder system. Additionally, the accelerator voltage on a high energy neutron generator is controlled by a downhole switching system to selectively obtain different neutron output in response to coded signal transmissions. Moreover, provisions for obtaining different timing pulses to control gates for sampling signals generated in the tool are provided. I

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