Radiant energy – Geological testing or irradiation – Well testing apparatus and methods
Patent
1993-11-29
1995-04-18
Hannaher, Constantine
Radiant energy
Geological testing or irradiation
Well testing apparatus and methods
250264, 250265, G01V 504
Patent
active
054080975
ABSTRACT:
A method and apparatus for detecting natural gamma-ray signals of an earth formation and correcting these gamma-ray signals for effects from borehole gamma-rays. Gamma-ray signals are detected at two detector locations in the borehole. The borehole effects are derived from the differences between the detected signals. After the borehole effects are determined, the detected gamma-ray signal is corrected for these effects and measurements of the formation elements are derived. A differential signal between the two detectors is created by excluding a small volume of borehole fluid from one of the detectors from the borehole fluid, before detecting gamma-rays at both detectors. The excluder displaces a known volume of borehole fluid equal to the volume of the excluder. Both detectors record gamma-ray generated from the formation and borehole. The additional volume of borehole fluid at one detector causes the detected signals to be different. This difference in signals is caused by the detection of the gamma-rays from the extra volume of fluid by the exposed detector. From this differential signal, correction parameters are derived to correct the signal for borehole effects caused by potassium in the borehole fluid, and thereby leave a signal indicative of natural gamma-rays from the earth formation.
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McKeon Donald C.
Wraight Peter D.
Garrana Henry N.
Glick Edward J.
Hannaher Constantine
Schlumberger Technology Corporation
Walker Darcell
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