Radiant energy – Geological testing or irradiation – Well testing apparatus and methods
Reexamination Certificate
2006-07-25
2006-07-25
Luebke, Renee (Department: 2875)
Radiant energy
Geological testing or irradiation
Well testing apparatus and methods
C250S256000, C250S253000, C250S370090
Reexamination Certificate
active
07081616
ABSTRACT:
A method for evaluating a natural gamma-ray activity within a borehole, comprises the steps of:stabilizing the gain according to a method for stabilizing a gain of a gamma-ray detector for use in a downhole logging tool;determining an interval count rate, the interval count rate corresponding to gamma-rays having an energy within a predetermined correction interval;calculating a correction count rate from the determined interval count rate; andusing the correction count rate to evaluate the natural gamma-ray activity.The method for stabilizing the gain of the gamma-ray detector for use in the downhole logging tool, comprises the steps of:processing a backscatter peak of a full gamma spectrum such that the backscatter peak constitutes a reference peak;determining a first rate, the first rate corresponding to gamma-rays having an energy within a first predetermined energy interval;determining a second rate, the second rate corresponding to gamma-rays having an energy within a second predetermined energy interval; andthe first predetermined energy interval and the second predetermined energy interval straddle the backscatter peak.
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Grau Jim
Plasek Ronald
Stoller Christian
Echols Brigitte L.
Luebke Renee
Schlumberger Technology Corporation
Segura Victor H.
Zettl Mary
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