Radiant energy – Geological testing or irradiation – Well testing apparatus and methods
Reexamination Certificate
2011-08-16
2011-08-16
Porta, David P (Department: 2884)
Radiant energy
Geological testing or irradiation
Well testing apparatus and methods
Reexamination Certificate
active
07999220
ABSTRACT:
A gamma ray detector assembly for a borehole logging system that requires the measure of gamma radiation with optimized gamma ray energy resolution and with fast emission times required to obtain meaningful measurements in high radiation fields. The detector assembly comprises a lanthanum bromide (LaBr3) scintillation crystal and a digital spectrometer that cooperates with the crystal to maximize pulse processing throughput by digital filtering and digital pile-up inspection of the pulses. The detector assembly is capable of digital pulse measurement and digital pile-up inspection with dead-time less than 600 nanoseconds per event. Pulse height can be accurately measured (corrected for pile-up effects) for 2 pulses separated by as little as 150 nanoseconds. Although the invention is applicable to virtually any borehole logging methodology that uses the measure of gamma radiation in harsh borehole conditions, the invention is particularly applicable to carbon/oxygen logging.
REFERENCES:
patent: 3747001 (1973-07-01), Fasching et al.
patent: 4476384 (1984-10-01), Westphal
patent: 4507554 (1985-03-01), Hertzog et al.
patent: 4766543 (1988-08-01), Schmidt
patent: 4872507 (1989-10-01), Ronco et al.
patent: 5055676 (1991-10-01), Roscoe et al.
patent: 6590957 (2003-07-01), Warburton
patent: 7084403 (2006-08-01), Srivastava et al.
patent: 7439515 (2008-10-01), Bak
patent: 7573026 (2009-08-01), Kurkoski et al.
patent: 2003/0076914 (2003-04-01), Tiller et al.
patent: 2004/0149917 (2004-08-01), Dorenbos et al.
patent: 2005/0056774 (2005-03-01), Samworth
patent: 2006029475 (2006-03-01), None
Odom, Richard C., Improvements in a Through-Casing Pulsed-Neutron Density Log, SPE71742, pp. 1-9, 2001 SPE Annual Technical Conference and Exhibition, New Orleans, Louisiana Sep. 30, 2001.
Alain Iltis et al., “Lanthanum halide scintillators: Properties and applications”, Nuclear Instruments & Methods in Physics Research A, 2006, pp. 359-363.
International Search Report from United Kingdom patent application No. GB090246.1 dated Sep. 23, 2009.
Boosalis Faye
Porta David P
Precision Energy Services, Inc.
Wong, Cabello, Lutsch, Rutherford & Brucculeri L.L.P.
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