Radiant energy – Geological testing or irradiation – Well testing apparatus and methods
Reexamination Certificate
2006-09-05
2006-09-05
Gabor, Otilia (Department: 2884)
Radiant energy
Geological testing or irradiation
Well testing apparatus and methods
C250S269600, C250S269100
Reexamination Certificate
active
07102125
ABSTRACT:
In the field of wellbore data logging it is known to use isotopic neutron sources in a neutron capture logging technique. However, continuous isotopic sources are unpopular for regulatory and safety reasons.Attempts to employ neutron generator tubes to generate neutron bursts for use in the neutron capture technique have encountered various difficulties in areas connected with signal identification and processing.The disclosure relates to a method of data logging in which a low burst rate neutron generator tube is pulsed at comparatively low rates to generate neutron bursts that are captured in atomic nuclei in a proximal formation. The gamma radiation arising from the neutron capture is detected over a gating intervals defined by temporally distinct points. The gamma detector output is integrated over the gating interval to provide a measure of the decay rate that is independent of the pulse rate. Consequently the signal processing problems do not arise.
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Gabor Otilia
Malevic Djura
Paul and Paul
Reeves Wireline Technologies Limited
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