Title:
KOENERUGIICHUSEISHI NO KURIKAESHIPARUSUNYORI SHIKUTSUSEIOKENSOSURUSOCHI
Document Type and Number:
Japanese Patent JPS5175601
Kind Code:
A
Abstract:
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 for 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.
Inventors:
SUTEIIBU JERARUDO MARON
OBII MAACHIN RANGUFUOODO
OBII MAACHIN RANGUFUOODO
Application Number:
JP11828875A
Publication Date:
June 30, 1976
Filing Date:
October 02, 1975
Export Citation:
Assignee:
TEXACO DEVELOPMENT CORP
International Classes:
G01V5/04; E21B47/12; G01N23/221; G01N33/24; G01V5/10; (IPC1-7): G01N23/00; G01V5/00