Radiant energy – Geological testing or irradiation – With drill or drilling
Patent
1990-02-26
1991-10-29
Fields, Carolyn E.
Radiant energy
Geological testing or irradiation
With drill or drilling
250266, G01V 508
Patent
active
050618490
ABSTRACT:
Improved radioactivity well logging by mounting a scintillator and photomultiplier tube in a single case interfacing with a hole extending through a drill collar at the lower end of a drill string so that measurements can be made while drilling. Radioactive sources (when required for well logging) are mounted in cavities which open to the exterior of the drill collar. Light from the scintillator is coupled directly to the aligned photomultiplier tube both of which are mounted in a case extending radially within the drill collar and sealingly engaging an electronics housing within the drill collar and the drill collar wall surrounding the hole. The scintillator is of greater diameter than the photomultiplier tube. A frustoconical light pipe connects the scintillator and the photomultiplier tube, channeling scintillation in the crystal to the photomultiplier to provide an amplified detection capability over that for a scintillator having the same diameter as the photomultiplier tube.
REFERENCES:
patent: 4492865 (1985-01-01), Murphy et al.
patent: 4904865 (1990-02-01), Meisner et al.
Groeschel Vernon E.
Meisner James E.
Mumby Edward S.
Baker Hughes Incorporated
Fields Carolyn E.
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